EP1680555A2 - Improvement to installations which are used to lower an aquifer in a porous substrate by means of drainage, in order to enable the deposition of a solid sedimentary material - Google Patents

Improvement to installations which are used to lower an aquifer in a porous substrate by means of drainage, in order to enable the deposition of a solid sedimentary material

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Publication number
EP1680555A2
EP1680555A2 EP04817087A EP04817087A EP1680555A2 EP 1680555 A2 EP1680555 A2 EP 1680555A2 EP 04817087 A EP04817087 A EP 04817087A EP 04817087 A EP04817087 A EP 04817087A EP 1680555 A2 EP1680555 A2 EP 1680555A2
Authority
EP
European Patent Office
Prior art keywords
level
water
collecting
station
installation according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP04817087A
Other languages
German (de)
French (fr)
Inventor
Carl Fredrik Linderoth
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ECOPLAGE
Original Assignee
ECOPLAGE
FIP
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ECOPLAGE, FIP filed Critical ECOPLAGE
Publication of EP1680555A2 publication Critical patent/EP1680555A2/en
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
    • E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B11/00—Drainage of soil, e.g. for agricultural purposes
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
    • E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
    • E02B3/041—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours using active mechanical means, e.g. fluidizing or pumping

Definitions

  • the present invention relates to an improvement to installations ensuring the lowering by drainage of an aquifer in a substrate. porous, to allow the deposition of a solid sedimentary material which is suspended in a body of natural water subject to level variations, associated with said porous substrate, this by reduction of the hydraulic pressure inside said substrate.
  • An installation of this kind is described in detail in document EP-A-0 108 269. This installation makes it possible, simply and effectively, to obtain sedimentation or accretion of sedimentary material on the edges of a body of water. covering a sandy or similar substrate, in particular to protect the sea coasts or the shores of lakes exposed to erosion, as well as to regain land on surfaces covered with water.
  • EP-A-0 108 269 comprises water collection drains buried in the sand preferably below the average level of the body of water; these drains are connected by a collector system to a collecting station in which an electrical pumping system is arranged. This pumping system is suitable for pumping out of the collecting station the water recovered by the drains and which has been conveyed by the collecting system.
  • the water collected by the drain (s) has been previously filtered by the beach sand and it can be used in marine aquariums, in swimming pools. sea water, or salt marshes; it can also be returned to the sea.
  • FIG. 3 of this document EP-A-0 108 269 illustrates an alternative embodiment, of a very different design, in which the installation does not have a water collection drain.
  • the water is conveyed in a collecting ditch by diffusion in the sandy substrate; there is also provided an evacuation pipe equipped with a valve which, in the open position, allows the discharge of the water collected in the ditch, when the level of the body of water falls below the level of said pipe d 'evacuation.
  • the corresponding installation comprises a plurality of parallel longitudinal conduits in the form of drains, buried in the sand, some above the low tide level, and for others below this low level.
  • These different drains are connected by pipes fitted with integrated mechanical means, in the form of valves and pumps, which give said drains an activity either of collecting water from the sandy substrate, or of diffusing water in this sandy substrate, this in particular according to the position of the drains, the level of the body of water, the intensity of the waves or the speed of the wind.
  • the water flows in one direction or the other inside the pipes, depending on the desired effect, and this permanently under the effect of the pumps.
  • the water from the drains is returned to the sea, except in exceptional cases of storms where it flows through storage tanks forming a buffer.
  • this type of installation requires the presence of drains above and below the low level of the body of water, which greatly complicates civil engineering operations at the time of construction.
  • this installation has a complex structure due to the imposed presence of pumps and two-way valves operating inside the pipes.
  • the present invention relates to an installation of the type that is the subject of FIGS. 1 and 2 of document EP-A-0 108 269, and the aim sought is to automatically and optimally regulate the drainage system, in order to allow the deposit a maximum of sediment on the surface of the porous substrate, this with a minimum of energy consumption.
  • the installation concerned ensuring the lowering by drainage of an aquifer into a porous substrate, to allow the deposition of a sedimentary solid matter which is suspended in a body of natural water subject to level variations, associated with said porous substrate, this by reducing the hydraulic pressure inside said substrate is of the type using at least one water collection drain buried in said substrate, which drain is connected by a collecting system to a collecting station; the collecting system ensures the routing of the water collected by the above-mentioned drain (s), into said collecting station, this by simple gravity; on the other hand, the collecting station comprises a pumping system adapted to pump the collected water, for example into the body of natural water, by means of a delivery pipe independent of said collecting system.
  • the installation comprises means suitable for automatically determining the level of the natural water mass, connected to means (preferably electronic management means) which make it possible to directly or indirectly shut down the system of pumping of the collecting station when the level of the water body is above a determined threshold value.
  • the pumps for discharging the collected water are thus used only when these discharges are effective from the point of view of lowering the level of the aquifer in the porous substrate.
  • the invention finds a particularly interesting application in the context of equipment for the coast of a sea or an ocean subject to the effects of the tides.
  • the means for automatically determining the level of the natural water mass advantageously take the form of at least one pressure sensor.
  • This pressure sensor is preferably placed at the level of the drain and it advantageously consists of a piezometric type sensor.
  • the piezometric sensor is arranged at the bottom of a vertical strainer tube and it is suitable for measuring the height of a column of water in said tube.
  • the pumping system of the collecting station is associated with a system of sensors which allows it to be started from the time when the water reaches a high level determined in said station, and which allows it to stop when the water reaches a determined low level.
  • the installation comprises at least one valve located on the collecting system, between the drain and the collecting station (and advantageously located at the level of the arrival of the collecting system in the collecting station) ; the electronic management means regulate the implementation of this valve so as to ensure its automatic opening when the level of the natural water mass falls below a certain threshold, said "opening threshold”, thus authorizing the supply of water to the collecting station, and so as to close it automatically when the level of the body of natural water exceeds a certain threshold, called “closing threshold”, preventing thus the water supply to the station and causing the indirect stopping of the pumping system through the internal sensor system; the opening and closing thresholds can be the same.
  • the installation comprises several drains or drainage systems arranged at different levels in the porous substrate; each drain or drainage system is associated with its own valve system, the implementation of these different valves being regulated separately by the electronic management system of the installation.
  • the electronic management means directly regulate the implementation of the pumping system arranged in the collecting station. This regulation is carried out so as to automatically cut off the pumping when the level of the natural water body exceeds a certain threshold, known as the "closing threshold", and conversely, capable of resuming pumping when said level drops below a certain level. threshold, called “opening threshold”; here again, said closing and opening thresholds can be the same.
  • FIG. 1 is a schematic cross-sectional view of a side equipped with an installation according to the invention
  • FIG. 2 is a schematic view illustrating a sensor for automatic detection of sea level in the installation shown in Figure 1.
  • Figure 1 illustrates the coastline 1 of a sea 2 with tides between a high level 3 and a low level 4.
  • a drainage pipe 6 buried parallel to the sea line, was buried between the high 3 and low 4 levels of the tides, and preferably below the medium level 7 of the tides.
  • the drain 6 is of the appropriate type and size to ensure its function of lowering the aquifer in the sandy material; for this, and to ensure the evacuation of the water which it collects, this drain 6 is connected to a collecting station 10 by means of a collecting system, here illustrated in the form of a pipe 12.
  • the collecting station 10 consists of a pit of appropriate dimensions and depth, equipped with a pumping system 13 making it possible to discharge the collected water outside, by means of a discharge pipe 14. As indicated above, this backflow can be carried out directly in the body of water 2; depending on the specifics linked to the equipped site, one can also consider using the water collected for the supply of aquariums, swimming pools, salt marshes or others.
  • the pumping system 13 consists of one or more electric water pumps. The operation of this or these pumps 13 is managed by a system of sensors internal to the station, illustrated only diagrammatically and marked 15; in particular the pump or pumps 13 are started from the moment when the water reaches a determined high level in the pit, and they are stopped when the water reaches a determined low level.
  • the collecting system 12 includes a valve 16 controlled by an electric motor 17. This valve
  • valve 16 determines, depending on its open or closed position, whether or not the station 10 is supplied with water from the drain 6.
  • the operation of the valve 16 by means of the motorization 17 is managed by a programmable controller 18, in function of information received relating to sea level.
  • the corresponding information is supplied to the programmable controller 18 via a sensor 20 capable of determining the sea level 2 at the appropriate time.
  • the sensor 20 is advantageously in the form of a piezometer suitable for measuring the height of a column of water. As illustrated in FIG. 2, the piezometer 20 can be positioned at the bottom of a vertical strainer tube 21 (that is to say a porous or perforated tube), to measure the height of the column of water in this tube.
  • the piezometer 20 can be suspended just above the bottom of the tube 21, held for example by the wiring 22 which connects it to the programmable controller 18.
  • the tube 21 is arranged vertically in the sandy material at the drainage pipe 6 ; it can have a height of the order of 1 to 3 meters; its porosity, or the perforations which equip it are adapted to allow the passage of water while retaining the grains of sand or the surrounding solid matter.
  • the height of the water column in the tube 21 is representative of the sea level when it is above the sensor 20.
  • the corresponding information is addressed by the pressure sensor 20 to the automaton 18 which, by processing the information, compares the value received with one or more threshold value (s) determined in advance.
  • the automaton 18 closes the valve 16 by means of the motorization 17; then the pumping system 13 stops itself under the effect of the sensor system 15, when the water reaches the predetermined low level in the station 10.
  • a determined threshold value called “closing threshold”
  • the automatic device 18 opens the valve 16 so as to evacuate the water collected during this period by the drain 6, so that the latter fully performs its function lowering of the aquifer in the sand.
  • the closing threshold and the opening threshold can be the same. We can also consider using different thresholds, in particular depending on the direction of the tide.
  • a single sensor can manage several valves linked to several drains or drainage systems. This single sensor can be placed at the drain level as illustrated in Figure 1, but we can also consider that it is placed elsewhere, in any place where we can measure the sea level. To optimize the functioning of the 'installation, it is possible to provide for the presence of a plurality of drains or drainage systems arranged at different levels in the porous substrate, between the high 3 and low 4 levels of the tides. In this case, and as illustrated in dotted lines in FIG.
  • one or more other drains 6 ' can be associated with the aforementioned drain 6, which additional drains 6' have their own collecting system 12 'provided with their own valve 16' with 17 'motorization, and their own pressure sensor 20', 21 '.
  • the different drains 6, 6 ′ are implanted in the porous substrate 5 at different levels, adapted according to the site equipped.
  • the programmable controller 18 manages the opening of the valves 16, 16 'independently of each other, according to the sea level detected by the sensors 20, 20', and this to ensure the evacuation of the 'water collected by the corresponding drain 6, 6', only when the sea level is below the opening threshold of the drain concerned.
  • valve system 16 In an alternative embodiment of the invention, and preferably in the presence of a drain or a single drainage system, it is possible to dispense with the valve system 16 and subject the operation of the pump (s) 13 to the programmable controller 18 which always receives the information relating to the sea level via the pressure sensor 20.
  • the management in question is illustrated by the dotted arrow marked 24.
  • the automatic device 18 implements the pumping system 13; the latter is then managed by the internal sensors 15.
  • the automaton 18 stops pumping when the sea level exceeds the closing threshold.
  • the collecting system 12 fills the station 10 by simple gravity.
  • the drainage system can be made up of several juxtaposed drains; the collector system of these juxtaposed drains may include a collection well itself connected to the pumping station by a simple pipe.
  • the positioning of the drains is adapted according to the hydrogeological conditions of the equipped site; in any event, they are never placed under the lowest line of the body of water.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Agronomy & Crop Science (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)

Abstract

The invention relates to an improvement to installations which are used to lower an aquifer in a porous substrate (5), particularly sand, by means of drainage, in order to enable the deposition of a solid sedimentary material which is suspended in a natural body of water (2) that is subject to variations in level and which is associated with the porous substrate (5), by reducing the hydraulic pressure inside said substrate. The installation comprises at least one water collection drain (6, 6') which is buried in the substrate (5). The aforementioned drain (6, 6') is connected to a gathering station (10) by means of a manifold system (12, 12'), said station being equipped with a pumping system (13) which is designed to pump the water collected. The above-mentioned manifold system (12, 12') conveys the water collected by the drain(s) (6, 6') into the gathering station (10). The installation comprises means (20, 20') for automatically determining the level of the natural water body (2), which are connected to means (18 and, optionally, 16, 16') for stopping the pumping system (13) directly or indirectly when the level of the natural water body (2) is above a determined threshold value. In addition, the means used for automatically determining the level of the natural water body (2) preferably take the form of a piezometric-type pressure sensor (20, 20').

Description

PERFECTIONNEMENT AUX INSTALLATIONS ASSURANT L'ABAISSEMENT PAR DRAINAGE D'UNE NAPPE AQUIFERE DANS UN SUBSTRAT POREUX POUR PERMETTRE LA DEPOSE D'UNE MATIERE SOLIDE SEDIMENTAIRE La présente invention concerne un perfectionnement aux installations assurant l'abaissement par drainage d'une nappe aquifère dans un substrat poreux, pour permettre la dépose d'une matière solide sédimentaire qui est en suspension dans une masse d'eau naturelle sujette à des variations de niveau, associée audit substrat poreux, ceci par réduction de la pression hydraulique à l'intérieur dudit substrat. Une installation de ce genre est décrite en détail dans le document EP-A- 0 108 269. Cette installation permet, de manière simple et efficace, d'obtenir une sédimentation ou accrétion de matière sédimentaire sur les bordures d'une masse d'eau recouvrant un substrat sablonneux ou similaire, en particulier pour protéger les côtes marines ou les rives de lacs exposées à l'érosion, ainsi que pour regagner des terres sur les surfaces recouvertes d'eau. L'installation faisant l'objet des figures 1 et 2 de ce document EP-A-0 108 269 comporte des drains de collecte d'eau enfouis dans le sable de préférence au-dessous du niveau moyen de la masse d'eau ; ces drains sont raccordés par un système collecteur à une station collectrice dans laquelle est aménagé un système de pompage électrique. Ce système de pompage est adapté pour refouler hors de la station collectrice l'eau récupérée par les drains et qui a été acheminée par le système collecteur.The present invention relates to an improvement to installations ensuring the lowering by drainage of an aquifer in a substrate. porous, to allow the deposition of a solid sedimentary material which is suspended in a body of natural water subject to level variations, associated with said porous substrate, this by reduction of the hydraulic pressure inside said substrate. An installation of this kind is described in detail in document EP-A-0 108 269. This installation makes it possible, simply and effectively, to obtain sedimentation or accretion of sedimentary material on the edges of a body of water. covering a sandy or similar substrate, in particular to protect the sea coasts or the shores of lakes exposed to erosion, as well as to regain land on surfaces covered with water. The installation forming the subject of FIGS. 1 and 2 of this document EP-A-0 108 269 comprises water collection drains buried in the sand preferably below the average level of the body of water; these drains are connected by a collector system to a collecting station in which an electrical pumping system is arranged. This pumping system is suitable for pumping out of the collecting station the water recovered by the drains and which has been conveyed by the collecting system.
Dans le cadre de l'équipement d'un littoral de mer ou d'océan, l'eau collectée par le ou les drains a été préalablement filtrée par le sable de la plage et elle peut être utilisée dans des aquariums marins, dans des piscines d'eau de mer, ou des marais salants ; elle peut aussi être restituée à la mer.As part of equipping a sea or ocean coastline, the water collected by the drain (s) has been previously filtered by the beach sand and it can be used in marine aquariums, in swimming pools. sea water, or salt marshes; it can also be returned to the sea.
La figure 3 de ce document EP-A-0 108 269 illustre une variante de réalisation, de conception très différente, dans laquelle l'installation est dépourvue de drain de collecte d'eau. L'acheminement de l'eau dans un fossé collecteur s'effectue par diffusion dans le substrat sablonneux ; il est prévu en outre une canalisation d'évacuation équipée d'une vanne qui, en position ouverte, permet le refoulement de l'eau collectée dans le fossé, lorsque le niveau de la masse d'eau passe sous le niveau de ladite canalisation d'évacuation.FIG. 3 of this document EP-A-0 108 269 illustrates an alternative embodiment, of a very different design, in which the installation does not have a water collection drain. The water is conveyed in a collecting ditch by diffusion in the sandy substrate; there is also provided an evacuation pipe equipped with a valve which, in the open position, allows the discharge of the water collected in the ditch, when the level of the body of water falls below the level of said pipe d 'evacuation.
L'effet correspondant d'abaissement de la nappe aquifère dans le sable peut être amplifié par le pompage de l'eau dans le fossé collecteur, lorsque la vanne précitée est fermée et que le niveau de la masse d'eau se situe au-dessus du niveau de la canalisation d'évacuation. Mais, dans tous les cas, le système de pompage de la station collectrice ou du fossé collecteur fonctionne indépendamment du niveau de la mer. En conséquence, au cours des périodes où le niveau de la mer est au-dessus d'un certain seuil, on pompe une grande quantité d'eau en partie inutilement, ce qui pénalise le rendement énergétique et rend l'exploitation de l'installation relativement coûteuse. Une autre installation du même genre est décrite dans le document US-A- 5 294 213. L'installation correspondante comprend une pluralité de conduits longitudinaux parallèles en forme de drains, enfouis dans le sable, certains au-dessus du niveau bas des marées, et pour les autres au-dessous de ce niveau bas. Ces différents drains sont reliés par des canalisations équipées de moyens mécaniques intégrés, en forme de vannes et de pompes, qui confèrent auxdits drains une activité soit de collecte des eaux provenant du substrat sablonneux, soit de diffusion de l'eau dans ce substrat sablonneux, cela notamment en fonction de la position des drains, du niveau de la masse d'eau, de l'intensité des vagues ou de la vitesse du vent. L'eau chemine dans un sens ou dans l'autre à l'intérieur des canalisations, en fonction de l'effet recherché, et ceci en permanence sous l'effet des pompes. Lors de la collecte, l'eau des drains est renvoyée à la mer, sauf en cas exceptionnel de tempête où elle chemine par des réservoirs de stockage formant tampon. Le fonctionnement de ce type d'installation nécessite la présence de drains au- dessus et au-dessous du niveau bas de la masse d'eau, ce qui complique grandement les opérations de génie civil au moment de la construction. En outre, cette installation a une structure complexe du fait de la présence imposée de pompes et de vannes à double sens de fonctionnement, disposées à l'intérieur des canalisations.The corresponding effect of lowering the aquifer in the sand can be amplified by pumping water into the collecting ditch, when the aforementioned valve is closed and that the level of the water body is above the level of the drainage pipe. However, in all cases, the pumping system of the collecting station or the collecting ditch operates independently of sea level. Consequently, during periods when the sea level is above a certain threshold, a large amount of water is pumped in part unnecessarily, which penalizes the energy efficiency and makes the operation of the installation relatively expensive. Another installation of the same kind is described in document US-A-5,294,213. The corresponding installation comprises a plurality of parallel longitudinal conduits in the form of drains, buried in the sand, some above the low tide level, and for others below this low level. These different drains are connected by pipes fitted with integrated mechanical means, in the form of valves and pumps, which give said drains an activity either of collecting water from the sandy substrate, or of diffusing water in this sandy substrate, this in particular according to the position of the drains, the level of the body of water, the intensity of the waves or the speed of the wind. The water flows in one direction or the other inside the pipes, depending on the desired effect, and this permanently under the effect of the pumps. During collection, the water from the drains is returned to the sea, except in exceptional cases of storms where it flows through storage tanks forming a buffer. The operation of this type of installation requires the presence of drains above and below the low level of the body of water, which greatly complicates civil engineering operations at the time of construction. In addition, this installation has a complex structure due to the imposed presence of pumps and two-way valves operating inside the pipes.
D'autre part, les pompes doivent fonctionner quasiment en permanence, dans un sens ou dans l'autre, ce qui est relativement coûteux en énergie. La présente invention concerne une installation du type de celle faisant l'objet des figures 1 et 2 du document EP-A-0 108 269, et le but recherché est de réguler automatiquement et de manière optimale le système de drainage, afin de permettre la dépose d'un maximum de sédiments sur la surface du substrat poreux, ceci avec un minimum de consommation énergétique. A cet effet, l'installation concernée assurant l'abaissement par drainage d'une nappe aquifère dans un substrat poreux, pour permettre la dépose d'une matière solide sédimentaire qui est en suspension dans une masse d'eau naturelle sujette à des variations de niveau, associée audit substrat poreux, ceci par réduction de la pression hydraulique à l'intérieur dudit substrat, est du type utilisant au moins un drain de collecte d'eau enfoui dans ledit substrat, lequel drain est raccordé par un système collecteur à une station collectrice ; le système collecteur assure l'acheminement de l'eau collectée par le ou les drains précités, dans ladite station collectrice, ceci par simple gravité ; d'autre part, la station collectrice comporte un système de pompage adapté pour refouler l'eau collectée, par exemple dans la masse d'eau naturelle, par l'intermédiaire d'une canalisation de refoulement indépendante dudit système collecteur. Conformément à la présente invention, l'installation comporte des moyens adaptés pour déterminer automatiquement le niveau de la masse d'eau naturelle, reliés à des moyens (de préférence des moyens de gestion électroniques) qui permettent d'arrêter directement ou indirectement le système de pompage de la station collectrice lorsque le niveau de la masse d'eau est au-dessus d'une valeur seuil déterminée. On met ainsi en oeuvre les pompes d'évacuation de l'eau collectée uniquement dans les moments où cette évacuation est efficace du point de vue de l'abaissement du niveau de la nappe aquifère dans le substrat poreux. L'invention trouve une application particulièrement intéressante dans le cadre d'un équipement de littoral d'une mer ou d'un océan sujet aux effets des marées. Les moyens pour déterminer automatiquement le niveau de la masse d'eau naturelle se présentent avantageusement sous la forme d'au moins un capteur de pression. Ce capteur de pression est de préférence disposé au niveau du drain et il consiste avantageusement en un capteur de type piézométrique. Selon une forme de réalisation intéressante, le capteur piézométrique est disposé au niveau du fond d'un tube vertical crépine et il est adapté pour mesurer la hauteur d'une colonne d'eau dans ledit tube. De préférence, le système de pompage de la station collectrice est associé à un système de capteurs qui permet sa mise en route à partir du moment où l'eau atteint un niveau haut déterminé dans ladite station, et qui permet son arrêt lorsque l'eau atteint un niveau bas déterminé. Dans ce cadre et selon une forme de réalisation possible, l'installation comporte au moins une vanne située sur le système collecteur, entre le drain et la station collectrice (et avantageusement située au niveau de l'arrivée du système collecteur dans la station collectrice) ; les moyens de gestion électroniques régulent la mise en œuvre de cette vanne de sorte à assurer son ouverture automatique lorsque le niveau de la masse d'eau naturelle passe sous un certain seuil, dit « seuil d'ouverture », autorisant ainsi l'alimentation en eau de la station collectrice, et de sorte à la fermer automatiquement lorsque le niveau de la masse d'eau naturelle dépasse un certain seuil, dit « seuil de fermeture », empêchant ainsi l'alimentation en eau de la station et entraînant l'arrêt indirect du système de pompage par l'intermédiaire du système de capteurs interne ; les seuils d'ouverture et de fermeture peuvent être les mêmes. Dans une forme de réalisation particulièrement intéressante, l'installation comporte plusieurs drains ou systèmes de drainage disposés à des niveaux différents dans le substrat poreux ; chaque drain ou système de drainage est associé à son propre système de vanne, la mise en œuvre de ces différentes vannes étant régulée séparément par le système de gestion électronique de l'installation. Selon une autre forme de réalisation possible, les moyens de gestion électroniques régulent directement la mise en œuvre du système de pompage disposé dans la station collectrice. Cette régulation est réalisée de sorte à couper automatiquement le pompage lorsque le niveau de la masse d'eau naturelle dépasse un certain seuil, dit « seuil de fermeture », et inversement, apte à remettre le pompage en route lorsque ledit niveau passe sous un certain seuil, dit « seuil d'ouverture » ; là encore, lesdits seuils de fermeture et d'ouverture peuvent être les mêmes. Mais l'invention sera encore illustrée, sans être aucunement limitée, par la description suivante d'un mode de réalisation particulier, donné uniquement à titre d'exemple et représenté sur les dessins annexés dans lesquels :On the other hand, the pumps must operate almost continuously, in one direction or the other, which is relatively expensive in energy. The present invention relates to an installation of the type that is the subject of FIGS. 1 and 2 of document EP-A-0 108 269, and the aim sought is to automatically and optimally regulate the drainage system, in order to allow the deposit a maximum of sediment on the surface of the porous substrate, this with a minimum of energy consumption. To this end, the installation concerned ensuring the lowering by drainage of an aquifer into a porous substrate, to allow the deposition of a sedimentary solid matter which is suspended in a body of natural water subject to level variations, associated with said porous substrate, this by reducing the hydraulic pressure inside said substrate, is of the type using at least one water collection drain buried in said substrate, which drain is connected by a collecting system to a collecting station; the collecting system ensures the routing of the water collected by the above-mentioned drain (s), into said collecting station, this by simple gravity; on the other hand, the collecting station comprises a pumping system adapted to pump the collected water, for example into the body of natural water, by means of a delivery pipe independent of said collecting system. In accordance with the present invention, the installation comprises means suitable for automatically determining the level of the natural water mass, connected to means (preferably electronic management means) which make it possible to directly or indirectly shut down the system of pumping of the collecting station when the level of the water body is above a determined threshold value. The pumps for discharging the collected water are thus used only when these discharges are effective from the point of view of lowering the level of the aquifer in the porous substrate. The invention finds a particularly interesting application in the context of equipment for the coast of a sea or an ocean subject to the effects of the tides. The means for automatically determining the level of the natural water mass advantageously take the form of at least one pressure sensor. This pressure sensor is preferably placed at the level of the drain and it advantageously consists of a piezometric type sensor. According to an advantageous embodiment, the piezometric sensor is arranged at the bottom of a vertical strainer tube and it is suitable for measuring the height of a column of water in said tube. Preferably, the pumping system of the collecting station is associated with a system of sensors which allows it to be started from the time when the water reaches a high level determined in said station, and which allows it to stop when the water reaches a determined low level. In this context and according to a possible embodiment, the installation comprises at least one valve located on the collecting system, between the drain and the collecting station (and advantageously located at the level of the arrival of the collecting system in the collecting station) ; the electronic management means regulate the implementation of this valve so as to ensure its automatic opening when the level of the natural water mass falls below a certain threshold, said "opening threshold", thus authorizing the supply of water to the collecting station, and so as to close it automatically when the level of the body of natural water exceeds a certain threshold, called "closing threshold", preventing thus the water supply to the station and causing the indirect stopping of the pumping system through the internal sensor system; the opening and closing thresholds can be the same. In a particularly advantageous embodiment, the installation comprises several drains or drainage systems arranged at different levels in the porous substrate; each drain or drainage system is associated with its own valve system, the implementation of these different valves being regulated separately by the electronic management system of the installation. According to another possible embodiment, the electronic management means directly regulate the implementation of the pumping system arranged in the collecting station. This regulation is carried out so as to automatically cut off the pumping when the level of the natural water body exceeds a certain threshold, known as the "closing threshold", and conversely, capable of resuming pumping when said level drops below a certain level. threshold, called "opening threshold"; here again, said closing and opening thresholds can be the same. However, the invention will be further illustrated, without being in any way limited, by the following description of a particular embodiment, given solely by way of example and represented in the appended drawings in which:
- la figure 1 est une vue schématique en coupe transversale d'une côte équipée d'une installation conforme à l'invention ;- Figure 1 is a schematic cross-sectional view of a side equipped with an installation according to the invention;
- la figure 2 est une vue schématique illustrant un capteur permettant la détection automatique du niveau de la mer dans l'installation représentée sur la figure 1. La figure 1 illustre le littoral 1 d'une mer 2 présentant des marées entre un niveau haut 3 et un niveau bas 4. Dans le rivage sablonneux 5 on a enfoui un tuyau de drainage 6, disposé parallèlement à la ligne de mer, entre les niveaux haut 3 et bas 4 des marées, et de préférence sous le niveau moyen 7 des marées. Le drain 6 est de type et de dimensions appropriés pour assurer sa fonction d'abaissement de la nappe aquifère dans le matériau sablonneux ; pour cela, et pour assurer l'évacuation de l'eau qu'il collecte, ce drain 6 est connecté à une station collectrice 10 par l'intermédiaire d'un système collecteur, ici illustré sous la forme d'une canalisation 12. La station collectrice 10 consiste en une fosse de dimensions et de profondeur appropriées, équipée d'un système de pompage 13 permettant de refouler à l'extérieur les eaux collectées, par l'intermédiaire d'une canalisation de refoulement 14. Comme indiqué auparavant, ce refoulement peut être réalisé directement dans la masse d'eau 2 ; en fonction des particularités liées au site équipé, on peut aussi envisager d'utiliser l'eau collectée pour l'approvisionnement d'aquariums, de piscines, de marais salants ou autres. Le système de pompage 13 consiste en une ou plusieurs pompes à eau électriques. Le fonctionnement de cette ou de ces pompes 13 est géré par un système de capteurs interne à la station, illustré uniquement schématiquement et repéré 15 ; en particulier la ou les pompes 13 sont mises en route à partir du moment où l'eau atteint un niveau haut déterminé dans la fosse, et elles sont stoppées lorsque l'eau atteint un niveau bas déterminé. Au niveau de son arrivée dans la station collectrice 10, le système collecteur 12 comporte une vanne 16 commandée par une motorisation électrique 17. Cette vanne- Figure 2 is a schematic view illustrating a sensor for automatic detection of sea level in the installation shown in Figure 1. Figure 1 illustrates the coastline 1 of a sea 2 with tides between a high level 3 and a low level 4. In the sandy shore 5 a drainage pipe 6, buried parallel to the sea line, was buried between the high 3 and low 4 levels of the tides, and preferably below the medium level 7 of the tides. The drain 6 is of the appropriate type and size to ensure its function of lowering the aquifer in the sandy material; for this, and to ensure the evacuation of the water which it collects, this drain 6 is connected to a collecting station 10 by means of a collecting system, here illustrated in the form of a pipe 12. The collecting station 10 consists of a pit of appropriate dimensions and depth, equipped with a pumping system 13 making it possible to discharge the collected water outside, by means of a discharge pipe 14. As indicated above, this backflow can be carried out directly in the body of water 2; depending on the specifics linked to the equipped site, one can also consider using the water collected for the supply of aquariums, swimming pools, salt marshes or others. The pumping system 13 consists of one or more electric water pumps. The operation of this or these pumps 13 is managed by a system of sensors internal to the station, illustrated only diagrammatically and marked 15; in particular the pump or pumps 13 are started from the moment when the water reaches a determined high level in the pit, and they are stopped when the water reaches a determined low level. At its arrival in the collecting station 10, the collecting system 12 includes a valve 16 controlled by an electric motor 17. This valve
16 détermine, selon sa position ouverte ou fermée, l'alimentation ou non de la station 10 par les eaux provenant du drain 6. Le fonctionnement de la vanne 16 par l'intermédiaire de la motorisation 17 est géré par un automate programmable 18, en fonction d'informations reçues relatives au niveau de la mer.16 determines, depending on its open or closed position, whether or not the station 10 is supplied with water from the drain 6. The operation of the valve 16 by means of the motorization 17 is managed by a programmable controller 18, in function of information received relating to sea level.
Les informations correspondantes sont fournies à l'automate programmable 18 par l'intermédiaire d'un capteur 20 apte à déterminer le niveau de la mer 2 au moment opportun. Le capteur 20 se présente avantageusement sous la forme d'un piézomètre adapté pour mesurer la hauteur d'une colonne d'eau. Tel qu'illustré sur la figure 2, le piézomètre 20 peut être positionné au niveau du fond d'un tube vertical crépine 21 (c'est-à-dire un tube poreux ou perforé), pour mesurer la hauteur de la colonne d'eau dans ce tube. Le piézomètre 20 peut être suspendu juste au-dessus du fond du tube 21 , maintenu par exemple par le câblage 22 qui le raccorde à l'automate programmable 18. Le tube 21 est disposé verticalement dans le matériau sablonneux au niveau du tuyau de drainage 6 ; il peut avoir une hauteur de l'ordre de 1 à 3 mètres ; sa porosité, ou les perforations qui l'équipent sont adaptées pour permettre le passage de l'eau tout en retenant les grains de sable ou les matières solides environnantes. La hauteur de la colonne d'eau dans le tube 21 est représentative du niveau de la mer lorsque celui-ci se situe au-dessus du capteur 20. L'information correspondante est adressée par le capteur de pression 20 à l'automate 18 qui, par traitement de l'information, compare la valeur reçue avec une ou des valeur(s) de seuil déterminée(s) à l'avance.The corresponding information is supplied to the programmable controller 18 via a sensor 20 capable of determining the sea level 2 at the appropriate time. The sensor 20 is advantageously in the form of a piezometer suitable for measuring the height of a column of water. As illustrated in FIG. 2, the piezometer 20 can be positioned at the bottom of a vertical strainer tube 21 (that is to say a porous or perforated tube), to measure the height of the column of water in this tube. The piezometer 20 can be suspended just above the bottom of the tube 21, held for example by the wiring 22 which connects it to the programmable controller 18. The tube 21 is arranged vertically in the sandy material at the drainage pipe 6 ; it can have a height of the order of 1 to 3 meters; its porosity, or the perforations which equip it are adapted to allow the passage of water while retaining the grains of sand or the surrounding solid matter. The height of the water column in the tube 21 is representative of the sea level when it is above the sensor 20. The corresponding information is addressed by the pressure sensor 20 to the automaton 18 which, by processing the information, compares the value received with one or more threshold value (s) determined in advance.
Dans le cas où le niveau de la masse d'eau 2 se situe au-dessus d'une valeur seuil déterminée (dite « seuil de fermeture »), l'automate 18 ferme la vanne 16 par l'intermédiaire de la motorisation 17 ; alors le système de pompage 13 s'arrête de lui- même sous l'effet du système de capteurs 15, lorsque l'eau atteint le niveau bas prédéterminé dans la station 10. En revanche, lorsque le niveau de la mer se situe sous une valeur de seuil déterminée (dite « seuil d'ouverture »), l'automate 18 ouvre la vanne 16 de manière à assurer l'évacuation de l'eau collectée pendant cette période par le drain 6, pour que ce dernier assure pleinement sa fonction d'abaissement de la nappe aquifère dans le sable. Le seuil de fermeture et le seuil d'ouverture peuvent être les mêmes. On peut aussi envisager d'utiliser des seuils différents notamment en fonction du sens de la marée. En conséquence, on va éviter de remplir inutilement la station collectrice 10 lorsque le niveau de la mer se situe au-dessus du seuil de fermeture, et la mise en œuvre de la ou des pompes 13 sera rationalisée. Un capteur unique peut gérer plusieurs vannes liées à plusieurs drains ou systèmes de drainage. Ce capteur unique peut être placé au niveau du drain comme illustré sur la figure 1, mais on peut également envisager qu'il soit placé ailleurs, en tout endroit où l'on peut mesurer le niveau de la mer. Pour optimiser le fonctionnement de l'installation, on peut prévoir la présence d'une pluralité de drains ou de systèmes de drainage disposés à des niveaux différents dans le substrat poreux, entre les niveaux haut 3 et bas 4 des marées. Dans ce cas, et tel qu'illustré en pointillés sur la figure 1, un ou plusieurs autres drains 6' peuvent être associés au drain précité 6, lesquels drains supplémentaires 6' comportent leur propre système collecteur 12' muni de leur propre vanne 16' avec motorisation 17', et de leur propre capteur de pression 20', 21'. Les différents drains 6, 6' sont implantés dans le substrat poreux 5 à des niveaux différents, adaptés selon le site équipé. Dans ce cas, l'automate programmable 18 gère l'ouverture des vannes 16, 16' indépendamment les unes des autres, en fonction du niveau de la mer détecté par les capteurs 20, 20', et cela pour assurer l'évacuation de l'eau collectée par le drain correspondant 6, 6', uniquement lorsque le niveau de la mer se situe sous le seuil d'ouverture du drain concerné. Dans une variante de réalisation de l'invention, et de préférence en cas de présence d'un drain ou d'un système de drainage unique, on peut se dispenser du système de vannes 16 et assujettir le fonctionnement de la ou des pompes 13 à l'automate programmable 18 qui reçoit toujours les informations relatives au niveau de la mer par l'intermédiaire du capteur de pression 20.In the case where the level of the body of water 2 is above a determined threshold value (called "closing threshold"), the automaton 18 closes the valve 16 by means of the motorization 17; then the pumping system 13 stops itself under the effect of the sensor system 15, when the water reaches the predetermined low level in the station 10. On the other hand, when the sea level is below a determined threshold value (called "opening threshold"), the automatic device 18 opens the valve 16 so as to evacuate the water collected during this period by the drain 6, so that the latter fully performs its function lowering of the aquifer in the sand. The closing threshold and the opening threshold can be the same. We can also consider using different thresholds, in particular depending on the direction of the tide. Consequently, we will avoid unnecessarily filling the collecting station 10 when the sea level is above the closing threshold, and the implementation of the pump (s) 13 will be rationalized. A single sensor can manage several valves linked to several drains or drainage systems. This single sensor can be placed at the drain level as illustrated in Figure 1, but we can also consider that it is placed elsewhere, in any place where we can measure the sea level. To optimize the functioning of the 'installation, it is possible to provide for the presence of a plurality of drains or drainage systems arranged at different levels in the porous substrate, between the high 3 and low 4 levels of the tides. In this case, and as illustrated in dotted lines in FIG. 1, one or more other drains 6 'can be associated with the aforementioned drain 6, which additional drains 6' have their own collecting system 12 'provided with their own valve 16' with 17 'motorization, and their own pressure sensor 20', 21 '. The different drains 6, 6 ′ are implanted in the porous substrate 5 at different levels, adapted according to the site equipped. In this case, the programmable controller 18 manages the opening of the valves 16, 16 'independently of each other, according to the sea level detected by the sensors 20, 20', and this to ensure the evacuation of the 'water collected by the corresponding drain 6, 6', only when the sea level is below the opening threshold of the drain concerned. In an alternative embodiment of the invention, and preferably in the presence of a drain or a single drainage system, it is possible to dispense with the valve system 16 and subject the operation of the pump (s) 13 to the programmable controller 18 which always receives the information relating to the sea level via the pressure sensor 20.
La gestion en question est illustrée par la flèche en pointillés repérée 24. Dans ce cas, lorsque le niveau de la mer se situe sous le seuil d'ouverture, l'automate 18 met en œuvre le système de pompage 13 ; ce dernier est alors géré par les capteurs internes 15. En revanche, l'automate 18 stoppe le pompage lorsque le niveau de la mer dépasse le seuil de fermeture. Dans ce cas, le système collecteur 12 remplit la station 10 par simple gravité. On notera que dans tous les cas de figures, le système de drainage peut être constitué de plusieurs drains juxtaposés ; le système collecteur de ces drains juxtaposés peut comporter un puits de collecte lui-même connecté à la station de pompage par une simple canalisation. De manière générale, le positionnement des drains est adapté selon les conditions hydrogéologiques du site équipé ; en tout état de cause, ils ne sont jamais placés sous la ligne la plus basse de la masse d'eau. D'autre part, dans des variantes moins performantes, on peut envisager de gérer l'installation selon l'invention par des moyens mécaniques plutôt qu'électroniques. The management in question is illustrated by the dotted arrow marked 24. In this case, when the sea level is below the opening threshold, the automatic device 18 implements the pumping system 13; the latter is then managed by the internal sensors 15. On the other hand, the automaton 18 stops pumping when the sea level exceeds the closing threshold. In this case, the collecting system 12 fills the station 10 by simple gravity. Note that in all cases, the drainage system can be made up of several juxtaposed drains; the collector system of these juxtaposed drains may include a collection well itself connected to the pumping station by a simple pipe. In general, the positioning of the drains is adapted according to the hydrogeological conditions of the equipped site; in any event, they are never placed under the lowest line of the body of water. On the other hand, in less efficient variants, it is possible to envisage managing the installation according to the invention by mechanical rather than electronic means.

Claims

- REVENDICATIONS - 1.- Installation assurant l'abaissement par drainage d'une nappe aquifère dans un substrat poreux (5), pour permettre la dépose d'une matière solide sédimentaire qui est en suspension dans une masse d'eau naturelle (2) sujette à des variations de niveau, associée audit substrat poreux (5), par réduction de la pression hydraulique à l'intérieur dudit substrat (5), laquelle installation comporte au moins un drain (6, 6') de collecte d'eau enfoui dans ledit substrat (5), lequel drain (6, 6') est raccordé par un système collecteur (12, 12') à une station collectrice (10), lequel système collecteur (12, 12') assure l'acheminement de l'eau collectée par ledit ou lesdits drains (6, 6') dans ladite station collectrice (10), ceci par simple gravité, laquelle station collectrice (10) comporte un système de pompage (13) adapté pour refouler l'eau collectée, par exemple dans la masse d'eau naturelle (2), par l'intermédiaire d'une canalisation de refoulement (14) indépendante dudit système collecteur (12, 12'), caractérisée en ce qu'elle comporte des moyens (20, 20') pour déterminer automatiquement le niveau de la masse d'eau naturelle (2), reliés à des moyens (18 et éventuellement 16, 16') qui permettent d'arrêter directement ou indirectement le système de pompage (13) lorsque le niveau de la masse d'eau naturelle (2) est au-dessus d'une valeur seuil déterminée. - CLAIMS - 1.- Installation ensuring the lowering by drainage of an aquifer in a porous substrate (5), to allow the deposit of a sedimentary solid matter which is suspended in a body of natural water (2) subject to level variations, associated with said porous substrate (5), by reduction of the hydraulic pressure inside said substrate (5), which installation comprises at least one drain (6, 6 ') for collecting buried water in said substrate (5), which drain (6, 6 ') is connected by a collecting system (12, 12') to a collecting station (10), which collecting system (12, 12 ') conveys the water collected by said one or more drains (6, 6 ') in said collecting station (10), this by simple gravity, which collecting station (10) comprises a pumping system (13) adapted to discharge the collected water, by example in the natural water body (2), via a discharge line (1 4) independent of said collecting system (12, 12 '), characterized in that it comprises means (20, 20') for automatically determining the level of the body of natural water (2), connected to means (18 and possibly 16, 16 ') which make it possible to stop the pumping system (13) directly or indirectly when the level of the natural water body (2) is above a determined threshold value.
2.- Installation selon la revendication 1, caractérisée en ce que les moyens qui permettent d'arrêter directement ou indirectement le système de pompage (13) lorsque le niveau de la masse d'eau naturelle (2) est au-dessus d'un seuil déterminé consistent en un système de gestion électronique (18). 2.- Installation according to claim 1, characterized in that the means which make it possible to directly or indirectly stop the pumping system (13) when the level of the natural water body (2) is above a determined threshold consists of an electronic management system (18).
3.- Installation selon l'une quelconque des revendications 1 ou 2, caractérisée en ce que les moyens pour déterminer automatiquement le niveau de la masse d'eau naturelle (2) se présentent sous la forme d'au moins un capteur de pression (20, 20'). 3.- Installation according to any one of claims 1 or 2, characterized in that the means for automatically determining the level of the body of natural water (2) are in the form of at least one pressure sensor ( 20, 20 ').
4.- Installation selon la revendication 3, caractérisée en ce que les moyens pour déterminer automatiquement le niveau de la masse d'eau naturelle (2) se présentent sous la forme d'au moins un capteur de pression (20, 20') disposé au niveau du drain (6, 6'). 4.- Installation according to claim 3, characterized in that the means for automatically determining the level of the body of natural water (2) are in the form of at least one pressure sensor (20, 20 ') arranged at the drain (6, 6 ').
5.- Installation selon l'une quelconque des revendications 3 ou 4, caractérisée en ce que le capteur de pression (20, 20') consiste en un capteur de type piézométrique. 5.- Installation according to any one of claims 3 or 4, characterized in that the pressure sensor (20, 20 ') consists of a piezometric type sensor.
6.- Installation selon la revendication 5, caractérisée en ce qu'elle comporte un capteur piézométrique (20, 20') disposé au niveau du fond d'un tube vertical crépine (21 , 21 '), et adapté pour mesurer la hauteur d'une colonne d'eau dans ledit tube (21, 21'). 6.- Installation according to claim 5, characterized in that it comprises a piezometric sensor (20, 20 ') disposed at the bottom of a vertical strainer tube (21, 21'), and adapted to measure the height d 'a column of water in said tube (21, 21').
7.- Installation selon l'une quelconque des revendications 1 à 6, caractérisée en ce que le système de pompage (13) de la station collectrice (10) est associé à un système de capteurs (15) qui permet sa mise en route à partir du moment où l'eau atteint un niveau haut déterminé dans ladite station (10), et qui permet son arrêt lorsque l'eau atteint un niveau bas déterminé. 7.- Installation according to any one of claims 1 to 6, characterized in that the pumping system (13) of the collecting station (10) is associated with a sensor system (15) which allows it to be started up at from the moment when the water reaches a determined high level in said station (10), and which allows its stopping when the water reaches a determined low level.
8.- Installation selon la revendication 7, caractérisée en ce qu'elle comporte au moins une vanne (16, 16') située sur le système collecteur (12, 12'), entre le drain (6, 6') et la station collectrice (10), la mise en œuvre de ladite ou desdites vannes (16, 16') étant régulée par les moyens de gestion électroniques (18) de sorte à ouvrir ladite ou lesdites vannes (16, 16') lorsque le niveau de la masse d'eau naturelle (2) passe sous un certain seuil, dit « seuil d'ouverture », autorisant ainsi l'alimentation en eau de ladite station collectrice (10), et de sorte à fermer automatiquement ladite ou lesdites vannes (16, 16') lorsque le niveau de la masse d'eau naturelle (2) dépasse un certain seuil, dit « seuil de fermeture », empêchant ainsi l'alimentation en eau de ladite station (10) et entraînant l'arrêt indirect du système de pompage (13) par l'intermédiaire du système de capteurs interne (15), lesdits seuils d'ouverture et de fermeture pouvant être les mêmes. 8.- Installation according to claim 7, characterized in that it comprises at least one valve (16, 16 ') located on the collecting system (12, 12'), between the drain (6, 6 ') and the station manifold (10), the implementation of said valve (s) (16, 16 ') being regulated by the electronic management means (18) so as to open said valve (s) (16, 16') when the level of the natural water mass (2) passes below a certain threshold, called the "opening threshold", thus authorizing the supply of water to said collecting station (10), and so as to automatically close said valve (s) (16, 16 ') when the level of the natural water body (2) exceeds a certain threshold, called the "closing threshold", thus preventing the supply of water to said station (10) and causing the system to be indirectly shut down pumping (13) via the internal sensor system (15), said opening and closing thresholds being able to be the same.
9.- Installation selon la revendication 8, caractérisée en ce que la ou les vannes (16, 16') sont situées chacune au niveau de l'arrivée du système collecteur (12, 12') dans la station collectrice (10). 9.- Installation according to claim 8, characterized in that the valve or valves (16, 16 ') are each located at the inlet of the collecting system (12, 12') in the collecting station (10).
10.- Installation selon l'une quelconque des revendications 8 ou 9, caractérisée en ce qu'elle comporte plusieurs drains ou systèmes de drainage (6, 6') disposés à des niveaux différents dans le substrat poreux (5), chaque drain ou système de drainage (6, 6') étant associé à son propre système de vanne (16, 16'), la mise en œuvre de ces différentes vannes (16, 16') étant régulée séparément par le système de gestion électronique (18). 1 - Installation selon l'une quelconque des revendications 1 à 7, caractérisée en ce que les moyens de gestion électroniques (18) régulent directement la mise en œuvre du système de pompage (13) disposé dans la station collectrice (10), de sorte à couper automatiquement ledit pompage (13) lorsque le niveau de la masse d'eau naturelle (2) dépasse un certain seuil, dit « seuil de fermeture », et inversement, apte à remettre le pompage (13) en route lorsque ledit niveau passe sous un certain seuil, dit « seuil d'ouverture », lesdits seuils de fermeture et d'ouverture pouvant être les mêmes. 10.- Installation according to any one of claims 8 or 9, characterized in that it comprises several drains or drainage systems (6, 6 ') arranged at different levels in the porous substrate (5), each drain or drainage system (6, 6 ') being associated with its own valve system (16, 16'), the implementation of these different valves (16, 16 ') being regulated separately by the electronic management system (18) . 1 - Installation according to any one of claims 1 to 7, characterized in that the electronic management means (18) directly regulate the implementation of the pumping system (13) disposed in the collecting station (10), so automatically cutting off said pumping (13) when the level of the natural water body (2) exceeds a certain threshold, known as a "closing threshold", and vice versa, capable of restarting pumping (13) when said level passes below a certain threshold, called the "opening threshold", said closing and opening thresholds being able to be the same.
EP04817087A 2003-10-06 2004-10-06 Improvement to installations which are used to lower an aquifer in a porous substrate by means of drainage, in order to enable the deposition of a solid sedimentary material Withdrawn EP1680555A2 (en)

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FR0311698A FR2860530B1 (en) 2003-10-06 2003-10-06 IMPROVEMENT TO FACILITIES PROVIDING DRAINAGE LOWERING OF AQUIFIED FLOOR INTO A POROUS SUBSTRATE TO ALLOW THE REMOVAL OF SEDIMENT SOLID MATERIAL
PCT/EP2004/011351 WO2005033419A2 (en) 2003-10-06 2004-10-06 Improvement to installations which are used to lower an aquifer in a porous substrate by means of drainage, in order to enable the deposition of a solid sedimentary material

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FR2860530A1 (en) 2005-04-08
FR2860530B1 (en) 2006-11-10
WO2005033419A3 (en) 2006-11-09
WO2005033419A2 (en) 2005-04-14

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