EP1644589A1 - Procede et dispositif de captage d eau douce - Google Patents
Procede et dispositif de captage d eau douceInfo
- Publication number
- EP1644589A1 EP1644589A1 EP04767334A EP04767334A EP1644589A1 EP 1644589 A1 EP1644589 A1 EP 1644589A1 EP 04767334 A EP04767334 A EP 04767334A EP 04767334 A EP04767334 A EP 04767334A EP 1644589 A1 EP1644589 A1 EP 1644589A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- conduit
- source
- fresh water
- tank
- sea
- 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.)
- Granted
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B3/00—Methods or installations for obtaining or collecting drinking water or tap water
- E03B3/06—Methods or installations for obtaining or collecting drinking water or tap water from underground
Definitions
- the present invention relates to a method of capturing fresh water from an underwater fresh water source.
- the present invention also relates to a device for collecting fresh water. These sources of fresh water constitute resurgences of underwater fresh water at the bottom of the sea.
- a reservoir-structure with concavity directed downwards covering the source of fresh water, and in which the fresh water is trapped in the upper part thanks to its lower density than that of sea water.
- This structure is open at its base to allow the evacuation of sea water and / or filling with fresh water.
- the capture device must be simple and easy to install at the bottom of the sea and inexpensive to make.
- the collection process and device must make it possible to avoid mixing between fresh water and sea water, so that pure fresh water is harvested.
- the hydraulic pressure at the level of the fresh water source flow orifice, is linked to the height of the slice of water located above said orifice, c '' ie at the depth of the orifice at the rate of 1 bar per ten meters deep. This hydraulic pressure is independent of the natural flow rate of the source.
- FR 2 701 974 The methods and devices described in FR 2 701 974 are specially adapted for the capture of fresh water along the coasts and cannot be implemented for sources located in the open sea, at the bottom of the sea and at a great distance from the side. In any event, these Collection methods and devices do not prevent mixing of salt sea water and fresh water during its collection.
- the open base of the tank is moored at the bottom of the sea at a certain distance from the bottom, thus facilitating the installation of the device in the event of a congested environment of the sea bottom such than rocks or rugged terrain. Under these conditions, however, in practice it is not possible to avoid the mixing of sea water and fresh water inside the tank.
- the open base of the tank hugs the bottom of the sea in a leaktight manner, so as to avoid mixing of salt sea water and fresh water after the initial phase for emptying the tank initially filled with seawater.
- non-return valves are provided allowing the evacuation of the water in the event of an increase in the flow rate of the source, thus avoiding cause excessive hydraulic overpressure at the source.
- the increases in flow are such that it is necessary to provide a very large number of valves.
- these valves are relatively fragile mechanical devices, calibrated for a given flow rate, and which further increase the cost of the device. These capture methods and devices are therefore not satisfactory both economically and technically.
- the collection device is not easy to install when the seabed, near the source, is damaged because, in this case, it is difficult to seal between the seabed and the open base of the tank which represents a relatively large diameter.
- the prior processes and devices for collecting underwater freshwater have the following shortcomings and drawbacks:
- either the system implies the presence of open surfaces in the ambient salted environment during the evacuation of the episodic excess of fresh water, which causes contamination at the level of the fresh water / salt water interface, and
- pumping in these prior systems, can generate negative pressure variations in the event of an increase in the flow rate from the source and, therefore, create a phenomenon of aspiration of salt water then polluting the pipe upstream.
- the object of the present invention is therefore to provide methods and devices for collecting fresh water which are simple and inexpensive to produce and install, which operate in a technically reliable manner over time and which combine the advantages of absence of mixing. seawater and freshwater and no risk of excessive hydraulic overpressure at the source, so as to avoid causing irreparable damage in the natural conduit, and which do not require any contribution of energy, in particular by pumping.
- the present invention provides a method of catching fresh water from an underwater fresh water source at the bottom of the sea, in which fresh water is collected in a first led t
- the fresh water is collected at a flow rate less than or equal to a given flow rate in a second conduit t 2 of diameter smaller than that of said first conduit, the second conduit whose upper end opens onto the surface and whose lower end extends inside said first conduit over a length and, when the flow of the source exceeds said given flow, the excess flow of the source is poured, from the upper end of said first conduit, into a open base tank containing air, said tank trapping the air contained above a water-air interface located inside said tank, the upper end of said first pipe being situated at a height H au- above the level of said water-air interface inside said tank. It is understood that the upper end of said first conduit opens into said tank.
- fresh water is collected at the end of said second conduit at a flow rate corresponding to the average flow rate from said source of fresh water.
- said first conduit t ⁇ is dimensioned and the value of H is determined so that: ⁇ t xgx H + G + P 1 ⁇ PS
- Hj height of the level of the water-air interface in the reservoir relative to the sea bottom at the level of the source.
- the height H and the dimensions of the first duct are therefore determined as a function of ⁇ PS.
- Said length 1 is greater than or equal to H.
- the hydraulic limit overpressure tolerated ( ⁇ PS) at the source is less than or equal to 0.1 bar (10 4 Pa).
- the present invention provides a device for catching fresh water from underwater source water useful in a method according to the invention, comprising:
- a second conduit t 2 whose diameter of the lower part is less than that of the upper part of said first conduit, and - a tank with an open base capable of cooperating with said second conduit t 2 so that, when the lower end of said second conduit is immersed inside said first conduit, the latter being positioned facing said source, l the lower end of said first conduit tightly surrounding said source in whole or in part, then the upper end of said first conduit t-, is covered by said reservoir and opens inside of it by said open base of said tank, the solid wall of said tank being sealed so as to be able to trap air between the wall of the tank and the water level inside said tank.
- the device comprises first means for mooring said first conduit t j to the bottom of the sea and / or to a base resting on the bottom of the sea, and said second means for mooring said second conduit and / or said tank thus moored (s) at the bottom of the sea and / or at the said first conduit,
- said reservoir is integral with said second conduit and surrounds it in a sealed manner, - said reservoir is constituted by an envelope, which may in particular be flexible or rigid, crossed in a sealed manner by said second conduit t 2 ,
- said envelope has in its upper part a shape of a substantially hemispherical cap or bell.
- said flexible envelope is capable of adopting a substantially hemispherical cap or bell shape at the bottom of the sea when it is moored and compressed air is injected under said envelope,
- the device comprises means for injecting compressed air inside said tank, -
- the diameter of the open base of said tank is such that its opening surface is at least equal to that of the source.
- the length of said first conduit t. is greater than or equal to the height of the reliefs and / or objects, natural or not, resting on the seabed in the vicinity of said underwater source within a radius corresponding to that of the open base of the reservoir,
- the diameter D, of said first conduit t at the lower end of said second conduit t 2 is such that the annular surface between the two said first and second conduits at this level is greater than or equal to the area of the section of said first conduit ( ⁇ D j is greater than 2/4 for a circular section).
- Said second conduit rises directly to the surface, preferably substantially vertically from the upper end of said second conduit, and the fresh water is recovered at the surface and transported ashore preferably by a ship.
- the present invention also provides a process for installing a freshwater collection device, characterized in that the following steps are carried out, in which: 1) positioning said first pipe t j above said source of underwater freshwater and mooring said first pipe t ⁇ at the bottom of the sea, so that the lower end of said first pipe t j surrounds sealingly all or part of said source of fresh water, and 2) it descends to the bottom of the sea said second pipe t 2 and reservoir which is moored to the bottom of the sea and / or to said first pipe t l 5 so that the lower end of said second pipe t 2 is contained inside the upper part of said first pipe t l 3 and
- the freshwater collection method and device according to the invention are advantageous for several reasons. Firstly, they make it possible to capture fresh water by preventing any contact, and therefore any mixture of fresh water and salt water, and therefore to collect pure fresh water. In fact, the air inside the tank creates an interface impassable by salt water which cannot contaminate the fresh water collected through said second conduit t 2 . Secondly, the process and device according to the invention make it possible to capture fresh water with a substantially constant fresh water collection rate, without risk of excessive overpressure and therefore avoiding any hydrogeological disturbance of the source which may result therefrom, and this, in the absence of mechanical means (s) for regulating the flow inside said first and second conduits such as discharge check valves, in particular at the junction of said first and second ducts or at the tank.
- the methods and device according to the invention make it possible to regulate the flow rate taken from the source and the hydraulic load from the source to its outlet, regardless of its natural flow rate, avoiding the risk of salt water intrusion into the ground delivery pipe through said second pipe in the event of excessive pumping, and this by means of regulation based on a principle hydraulic and not mechanical and therefore in the absence of the implementation of additional mechanical control means.
- the adjustment of the height H of the interface has a direct influence on the flow rate passing through said second conduit t 2 , as well as on the value of the overpressure generated on the source.
- are linked to the geometry and, of course, to the state of the surface of the material constituting the internal wall of said pipes, as well as to the speed of the water. flowing in said first pipe.
- the H value remains constant. However, in the event of accidental withdrawal greater than the natural flow rate of the source, the level of fresh water in the upper part of said first conduit will drop and pass under the lower end of said second conduit t 2 , which will have the effect of bring air into said second conduit t 2 3 and not salt water because the system is temporarily defused.
- said reservoir is lowered to the bottom of the sea, empty of air and therefore filled with sea water, and, when it is positioned above the upper end of said first duct t
- the shape and the value of the volume of said tank have no effect on the principle of hydraulic collection of fresh water and will be as small as possible and most suited to the ease of installation of said tank at the bottom. from the sea.
- the sealing at the lower end of said first conduit is obtained by ensuring that the perimeter of the conduit follows the contour of the relief of the seabed at the source.
- Said first conduit can be moored at the bottom of the sea by ballast or a peripheral rod resting at the bottom.
- a pipe ti as short as possible and of larger diameter.
- the first pipe t extends over a height of water preferably greater than the altitude of the relief of the seabed, in the immediate vicinity of the source and / or obstacles and congestion, natural or not, such as mainly rocks.
- the open base of the tank can thus be moored to the bottom of the sea and / or to the said first pipe, released at a certain distance above the source and, in particular, above said relief and / or objects, natural or not. , in the source area.
- FIGS. 1 and 2 respectively represent a collection device installed at the bottom of the sea, above an underwater source of fresh water (Figure 1) and reservoir 4 ( Figure 2).
- a freshwater collection device has been produced suitable for collecting fresh water from the so-called "la Mortola” source located in Italy between
- Chin enters Nintimille This source has an average freshwater flow of 100 1 / s.
- the hydrogeologists have determined that the maximum tolerable hydraulic overpressure for this source is 0.1 bar.
- This source is located at a depth of 36 m and its orifice comes out at the foot of 5 m high rocky blocks. It is located 800 m from the coast.
- a first conduit t t 2 with a total height of 7 m is used, having a tubular running part with circular section 0.4 m in diameter.
- Said first leads t. 2 is terminated at its lower end 2- by a funnel flared downwards and the lower end of which forms a circle with a diameter of 1.3 m, so as to properly surround said source taking into account the geometry of the orifice output from said source.
- This first lower funnel 2. consists of a rigid sheet, plastic or metallic, surrounding the circular end of the current part of said first conduit t x 2 at its lower end.
- Said lower funnel 2 represents a height of 4 m.
- Said first conduit t x 2 comprises, in its upper part, a second funnel 2 2 of small and large bases with circular sections, also produced by winding a metal sheet or of thermoformed plastic, surrounding the upper end part of said first leads.
- This flared shape towards the top of the upper part of said first conduit aims to facilitate the discharge of excess fresh water flow from the source inside the reservoir 4.
- the open lower base of the first funnel 2 t is integral with a base 8 resting on the bottom of the sea and surrounding the source. It can also be surrounded by a rod of sand or concrete or other peripheral ballast ensuring sealing with the sea bottom.
- the current part of said first conduit t x 2 can consist of a flexible or rigid pipe. It is arranged vertically above said source.
- Said tank 4 consists of an upper rigid envelope 4 t crossed at its center by a second conduit t 2 3, preferably rigid, with a diameter of 0.4 m.
- the rigid envelope constituting the upper part of said tank 4 forms a 4 X hemispherical cap with a diameter of 1.8 m and extended at its base with a frustoconical surface hereinafter called cone 4 2 of 2 m in height surrounding said first conduit . It is the open base of said cone 4 2 which lets out the excess fresh water in the event of a source flood.
- the base of the cone 4 is moored by mooring means 7 t to said first conduit t x 2, so that the base of said cone is located at a height of 5 m from the bottom of the sea.
- the presence of the cone 4 2 is optional.
- the base of the 4 X cap can be moored directly to said first duct.
- the portion of said second conduit t 2 3 located inside said tank 4 has a length of 1 m.
- the height H between the air-water interface 6 inside the tank 4 and the air-water interface at the upper end of said upper funnel 2 2 of said first conduit t x 2 is 0.2 m.
- the lower end 3 of said second conduit t 2 3 has gussets or webs 9 at its periphery which serve as reinforcements and for centering said lower end of the second conduit inside said funnel 2 at the upper end of said first conduit.
- a flowmeter 10 has been represented, approximately halfway up said first duct. These are the characteristics of this flowmeter 10 which have justified implementing a portion of said first duct t 2 narrower at this level to adapt it to said flow meter 10 which was available.
- reinforcement elements l x At the base of said first conduit t x 2, reinforcement elements l x have also been adapted which also serve as mooring by bolting on a base 8 sealingly surrounding the orifice of the source 1.
- fresh water passes through said second conduit t 2 3, flowing at an average flow rate of the source of 100 1 / s, taking into account the dimensioning of said first pipe and the determination of the value H d on the one hand, and the fact that the maximum hydraulic overpressure tolerated by the source is 0.1 bar.
- the "resistance" encountered by the fresh water to flow through the pipe t 2 is equal to the pressure losses generated by its flow in the said pipe t 2 but is calculated conventionally as a function of the diameter, the length of said pipe t 2 and the flow rate.
- the rigid envelope 4 X as well as the cone 4 2 constituting said tank 4, can be made of a plastic material, a composite material or steel.
- This freshwater collection system can operate, as mentioned above, without a pump since freshwater, due to its lower density than seawater, rises naturally to the surface.
Landscapes
- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Public Health (AREA)
- Environmental & Geological Engineering (AREA)
- Physical Water Treatments (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
- Removal Of Floating Material (AREA)
- Jet Pumps And Other Pumps (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CY20091100155T CY1108760T1 (el) | 2003-07-08 | 2009-02-11 | Μεθοδος και διαταξη συλλογης γλυκου υδατος |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0308308A FR2857389B1 (fr) | 2003-07-08 | 2003-07-08 | Procede et dispositif de captage d'eau douce |
PCT/FR2004/001471 WO2005014941A1 (fr) | 2003-07-08 | 2004-06-11 | Procede et dispositif de captage d'eau douce |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1644589A1 true EP1644589A1 (fr) | 2006-04-12 |
EP1644589B1 EP1644589B1 (fr) | 2008-11-12 |
EP1644589B9 EP1644589B9 (fr) | 2008-12-31 |
Family
ID=33522839
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04767334A Expired - Lifetime EP1644589B9 (fr) | 2003-07-08 | 2004-06-11 | Procede et dispositif de captage d eau douce |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP1644589B9 (fr) |
AT (1) | ATE414200T1 (fr) |
CY (1) | CY1108760T1 (fr) |
DE (1) | DE602004017734D1 (fr) |
ES (1) | ES2315693T3 (fr) |
FR (1) | FR2857389B1 (fr) |
PT (1) | PT1644589E (fr) |
WO (1) | WO2005014941A1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2014044930A1 (fr) | 2012-09-21 | 2014-03-27 | Nymphea Environnement | Procédé et dispositif de collecte d'un fluide sous marin léger tel que de l'eau douce ou des hydrocarbures |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1911893A1 (fr) | 2006-10-13 | 2008-04-16 | Joel Fontaine | Système de captage de sources sous-marines |
FR2926570B1 (fr) * | 2008-01-23 | 2010-04-02 | Michel Peril | Procede et dispositif de captation d'eau douce sous-marine |
FR2926569A1 (fr) * | 2008-01-23 | 2009-07-24 | Michel Peril | Procede et dispositif de captation d'eau douce sous-marine |
US20110038674A1 (en) * | 2008-01-23 | 2011-02-17 | Michel Peril | Method and device for tapping undersea freshwater |
GR1006748B (el) * | 2009-01-02 | 2010-04-08 | Αναργυρος Δημητριου Μανος | Συστημα ανυψωσεως γλυκου υδατος απο αναβλυζουσες πηγες εντος του βυθου της θαλασσης με ταυτοχρονη παραγωγη ενεργειας |
FR3100807B1 (fr) | 2019-09-13 | 2021-10-08 | Ifp Energies Now | Procédé et système de dessalement avec une étape d’osmose retardée et une étape d’osmose inverse |
FR3136795B1 (fr) | 2022-06-16 | 2024-06-21 | Ifp Energies Now | Système et procédé de captage d’eau de sources sous-marines et ou côtières avec bassin de débordement |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2701974A1 (fr) | 1993-02-26 | 1994-09-02 | Therond Patrick | Procédé et dispositif de captage de résurgences sous-marines d'eau douce. |
FR2785001B3 (fr) * | 1998-10-21 | 2001-01-12 | Hydro Logic | Dispositif de captage de resurgences sous-marines d'eau douce |
FR2792664A1 (fr) * | 1999-04-26 | 2000-10-27 | Eric Gilli | Procede et dispositif de captage d'eau douce au niveau d'un exutoire karstique |
FR2795109B1 (fr) | 1999-06-18 | 2001-09-07 | Geocean Solmarine | Procede et dispositif de detection, localisation et captage de source d'eau douce en mer |
-
2003
- 2003-07-08 FR FR0308308A patent/FR2857389B1/fr not_active Expired - Fee Related
-
2004
- 2004-06-11 ES ES04767334T patent/ES2315693T3/es not_active Expired - Lifetime
- 2004-06-11 DE DE602004017734T patent/DE602004017734D1/de not_active Expired - Fee Related
- 2004-06-11 EP EP04767334A patent/EP1644589B9/fr not_active Expired - Lifetime
- 2004-06-11 AT AT04767334T patent/ATE414200T1/de not_active IP Right Cessation
- 2004-06-11 PT PT04767334T patent/PT1644589E/pt unknown
- 2004-06-11 WO PCT/FR2004/001471 patent/WO2005014941A1/fr active Application Filing
-
2009
- 2009-02-11 CY CY20091100155T patent/CY1108760T1/el unknown
Non-Patent Citations (1)
Title |
---|
See references of WO2005014941A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2014044930A1 (fr) | 2012-09-21 | 2014-03-27 | Nymphea Environnement | Procédé et dispositif de collecte d'un fluide sous marin léger tel que de l'eau douce ou des hydrocarbures |
Also Published As
Publication number | Publication date |
---|---|
CY1108760T1 (el) | 2014-04-09 |
ATE414200T1 (de) | 2008-11-15 |
PT1644589E (pt) | 2009-02-16 |
EP1644589B9 (fr) | 2008-12-31 |
EP1644589B1 (fr) | 2008-11-12 |
ES2315693T3 (es) | 2009-04-01 |
FR2857389A1 (fr) | 2005-01-14 |
WO2005014941A1 (fr) | 2005-02-17 |
DE602004017734D1 (de) | 2008-12-24 |
FR2857389B1 (fr) | 2005-10-14 |
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