EP2312059B1 - Verfahren zum Schützen von Küsten und dergleichen - Google Patents

Verfahren zum Schützen von Küsten und dergleichen Download PDF

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Publication number
EP2312059B1
EP2312059B1 EP20090172798 EP09172798A EP2312059B1 EP 2312059 B1 EP2312059 B1 EP 2312059B1 EP 20090172798 EP20090172798 EP 20090172798 EP 09172798 A EP09172798 A EP 09172798A EP 2312059 B1 EP2312059 B1 EP 2312059B1
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EP
European Patent Office
Prior art keywords
sandbank
raised
coast
water
raising
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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.)
Not-in-force
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EP20090172798
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English (en)
French (fr)
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EP2312059A1 (de
Inventor
Bart Peter Verboomen
Gusta Louis Dens
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.)
Baggerwerken Decloedt and Zoon NV
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Baggerwerken Decloedt and Zoon NV
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Priority to EP20090172798 priority Critical patent/EP2312059B1/de
Publication of EP2312059A1 publication Critical patent/EP2312059A1/de
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    • 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

Definitions

  • the invention relates to a method for protecting coasts and the like against the effects of a higher average low-water line, according to the preamble of claim 1.
  • low-water line is understood to mean the water level associated with the lowest water line.
  • the low-water line is also known to the skilled person as the LAT ("Lowest Astronomical Tide"). The LAT is determined per location on the basis of astronomical predictions.
  • a known method for limiting the risk of flooding and for protecting coasts and the like against the effects of a higher average low-water line comprises of building additional and optionally higher water barriers on land and/or along rivers.
  • US 3,564,853 A discloses a method in which a flexible perforated curtain is secured to the sea floor at some distance from the coast line, whereby the curtain is kept upright by floaters.
  • the curtain collapses by upcoming waves allowing sediment to be carried over the curtain.
  • the floaters then raise the curtain after passage of the waves such that the sediment is trapped by the curtain and is deposited between the curtain and the coast line.
  • US 4,367,978 A discloses a module provided with openings that are accessible to water and brake the energy of incoming waves when placed in a string in side-by-side relation onto a sand bar.
  • An object of the present invention is to provide a method for protecting coasts and the like against the effects of a higher average low-water line, wherein a protection is provided which is at least equivalent to the known water barrier and the above stated drawback, among others, can be obviated.
  • the method comprises of raising one or more existing sandbanks located off the coast whereby the raising is performed by arranging a quarry stone water barrier on the side of the at least one sandbank remote from the coast, raising the relevant sandbank to a desired height on the coast side thereof by pouring sand, and allowing the thus obtained sand body to acquire a natural incline on the side of the water barrier.
  • the low-water line is defined as the water level associated with the lowest water line.
  • the raising can in principle be carried out by pouring any type of material, although use is preferably made for this purpose of bed material, in particular sand and/or gravel and/or a combination of the two.
  • bed material necessary for raising purposes can be supplied in simple and rapid manner.
  • supply of the bed material necessary for raising the sandbanks can for instance take place by supplying this bed material, generally sand, by road, it is recommended that the bed material is dredged in the vicinity, and more preferably in the immediate vicinity, of the sandbanks. Dredging is a per se known technique and can for instance be performed using a suction hopper dredger.
  • This comprises a drag head which, together with a suction pipe, is lowered under water at the rear of the suction hopper dredger until it makes contact with the bottom under the influence of its own weight.
  • the drag head is dragged over the ground for dredging, wherein the soil is loosened and suctioned away with water via the suction pipe.
  • the suctioned bed material can be immediately transported via a transport conduit to the desired location, more particularly to the sandbanks to be raised.
  • the part of the underwater bed which does not form part of the sandbank(s) is raised at least less than the sandbank(s), or even substantially not raised. Not raising or hardly raising the water bed lying between the sandbanks saves a considerable quantity of raising material. It has moreover been found that the improved coast protection also already occurs simply by raising the sandbank(s). The present preferred embodiment moreover prevents disruption to shipping, and the ebb and flood currents are left substantially undisturbed. Silting is hereby counteracted.
  • a further advantage of the invented method is that the coast protection as it were adapts itself to future rises in sea level in highly flexible manner.
  • a preferred embodiment of the method according to the invention is characterized in that at least one sandbank is raised depending on the low-water line, and more preferably in proportion to the low-water line. In this way it is for instance possible to ensure that the average water depth at the position of the sandbanks at least does not increase with the rise in sea level.
  • the method is preferably characterized in that the at least one sandbank is raised periodically, and more preferably annually. Such a method ensures, among other things, that the raised sandbanks remain substantially stable. It is advantageous in this respect to characterize the method according to the invention in that the average annual raising of the at least one sandbank amounts to between 0.1 and 20 cm, more preferably between 0.2 and 10 cm, and most preferably between 0.2 and 5 cm.
  • the method according to the invention is not limited to raising the sandbank(s) to a determined height. It is thus possible to raise the sandbank(s) or a part of the sandbanks to a crest level which exceeds the low-water line. In such a case the crest of the raised sandbank will protrude above the water surface at low water. In a preferred embodiment the at least one sandbank is raised to a crest level which reaches as maximum to the low-water line. Although the transmission of waves over a thus raised sandbank is greater than for a sandbank which has been raised above the low-water line, the average wave height on the coast side of the raised sandbank is not found to be appreciably affected.
  • the invention is based on the raising of existing sandbanks off a coastline.
  • the existing sandbanks can here be situated any random distance from the coast. They can also have any size, wherein typical dimensions can be many (tens of) kilometres.
  • a preferred embodiment of the method according to the invention is characterized in that the at least one sandbank lies at a distance from the coast which amounts to a maximum of 20 km, more preferably a maximum of 10 km, and most preferably a maximum of 5 km.
  • the raised entity is obtained by arranging a quarry stone water barrier on the side of a sandbank remote from the coast, raising the relevant sandbank to the desired height on the coast side thereof by pouring sand, and allowing the thus obtained sand body to acquire a natural incline on the side of the water barrier.
  • the natural incline on the side of the water barrier is obtained by transmission of waves through the quarry stone water barrier.
  • Such a water barrier is sufficiently water-permeable to make this possible. It is possible to once again remove the water barrier after the sand body has acquired the natural incline. It is also possible to keep the water barrier.
  • a raised entity according to the present invention is stable and results in relatively little silting. If the water barrier is kept, the water barrier preferably comprises a protective layer of stones, concrete blocks and/or fibrous open stone asphalt. Fibrous open stone asphalt is described in, among others, European patent EP 0 344 141 B1 .
  • the sandbank is raised with sand or other bed material to a level below the low-water line prior to arranging of the water barrier.
  • a further preferred embodiment of the method according to the invention is characterized in that the raised sandbanks are compacted.
  • Compacting of the raised sandbanks can for instance be carried out by vibration or by pile-driving with a drop weight. It is also possible and advantageous to provide the raised sandbanks with grout columns for further stabilizing thereof.
  • the raised underwater bed can in principle be compacted to any desired saturated density.
  • the saturated density is understood to mean the density of a volume of material which is substantially wholly saturated with water. It has been found advantageous for the raised sandbank to be compacted to a saturated density lying between 1.6 ton/m 3 and 2.3 ton/m 3 , more preferably between 1.7 ton/m 3 and 2.2 ton/m 3 , and most preferably between 1.9 ton/m 3 and 2.1 ton/m 3 .
  • FIG. 1A shows an existing sandbank 1.
  • Sandbank 1 comprises a sand body which is on average higher than underwater bed 2.
  • the level of water mass 3 shown in figure 1A corresponds to the high-water line (in the shown example this is 3 m).
  • sandbank 1 is raised by pouring material such as sand or gravel onto sandbank 1 by means of a pontoon or ship 4 provided with a chute 5. This preferably takes place at high water, wherein the raising takes place to just below the low-water level (in the shown example this is 1 m).
  • a raised entity 6 thus results which in the shown variant extends substantially only over the surface of existing sandbank 1.
  • the part of underwater bed 2 not forming part of sandbank 1 is therefore substantially not raised.
  • a water barrier 10 from a mass of quarry stone 9 is arranged on the side of sandbank 1 remote from the coast.
  • Water barrier 10 is preferably provided with a protective layer of stones, concrete blocks and/or open stone asphalt.
  • Pontoon 8 carries a mass of quarry stone 9, while pontoon 7 is provided with a crane 11 which moves quarry stone 9 from pontoon 8 onto raised entity 6 at the location where water barrier 10 must be placed.
  • sandbank 1 is raised further to the desired height on the coast side of water barrier 10 (in the figure this is the right-hand side of water barrier 10) by pouring sand and/or gravel.
  • a sand body 12 is thus created.
  • the desired height of sand body 12 corresponds to a height which extends just beyond the low-water level. It is however also possible to raise to a level below the low-water level or, conversely, to a level just below, at or beyond the high-water level.
  • a subsequent step comprises of allowing the thus obtained sand body 12 to acquire a natural incline 13 on the side of water barrier 10.
  • This natural incline 13 can be brought about in that water barrier 10 is constructed from a mass of quarry stone 9. This ensures that water barrier 10 is to a certain extent permeable to water.
  • a sand body 12 obtained according to the above described method ensures a decreased average wave height at the coast, even in the case of a higher average low-water level due to a rise in sea level. It has also been found that the average period of the waves at the coast also decreases. This decrease has a particularly favourable influence on preventing coastal erosion.
  • a further advantage of the method according to the invention is that the obtained sand body 12 can be raised further in simple manner in the case of a rise in the water level. This preferably takes place depending on the low-water line, and more preferably in proportion to the low-water line. Sandbank 1, or sand body 12, is preferably raised periodically, for instance annually.
  • Figure 2 shows a schematic top view of a number of raised sandbanks 13-17 according to the invention.
  • the raised sandbanks 13-17 lie off the Belgian coast 20, have a typical maximum dimension of 5-10 km, and are at some distance from each other.
  • the intermediate distances preferably do not become smaller, or hardly so, through raising the existing sandbanks. This ensures a natural flow at the position of the coastline, wherein ebb and flood currents can for instance continue to occur.
  • the overall distance over which the sandbanks extend (the distance between points A and B) amounts to about 70 km.
  • the average shortest intermediate distance between the sandbanks therefore amounts to about 5 km.
  • sandbanks lying off the coast need in principle be raised. It is sometimes advantageous to raise only some of the sandbanks that are present. Preferably raised are those sandbanks 1 situated at a distance from the coast of a maximum of 20 km, more preferably a maximum of 10 km, and most preferably a maximum of 5 km.
  • the amount of sand and/or gravel which must be poured periodically, in particular annually, can amount to several million m 3 and more per sandbank. If desired, this quantity of material can be dredged in the vicinity of the sandbanks to be raised. This avoids large quantities of sand or other bed material having to be stored.
  • sandbanks 1 By allowing sandbanks 1 to as it were grow together with the rise in sea level as according to the invention, it is possible to prevent the erosive effect of the waves on the coast increasing as the sea level rises. In the shown example a raising of the sandbanks by 1 cm per year can accommodate a rise in sea level of 50 cm by 2050, and of 100 cm by 2100.
  • the average wave height of the waves behind the raised sandbanks 13-17 is reduced by 35% at high water and by 70% at low water, at least if the sandbanks are raised to a level of 1.5 m below the low-water line.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Revetment (AREA)

Claims (10)

  1. Verfahren zum Schutz von Küsten (20) und Ähnlichem gegen die Auswirkungen eines höheren durchschnittlichen Niedrigwasserpegels, wobei das Verfahren das Anheben einer oder mehrerer bestehender Sandbänke (1), die sich von der Küste (20) entfernt befinden, dadurch gekennzeichnet, dass das Anheben durch Schaffung einer Wasserbarriere (10) aus Bruchsteinen (9) an der der Küste abgewandten Seite der mindestens einen Sandbank (1) erfolgt, das Anheben der betreffenden Sandbank (1) an der der Küste zugewandten Seite auf eine gewünschte Höhe durch Aufschütten von Sand und das Zulassen der Ausprägung des so geschaffenen Sandkörpers mit einer natürlichen Neigung auf der Seite der Wasserbarriere (10) umfasst.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass derjenige Teil des Unterwasserbetts (2), der keinen Bestandteil der mindestens einen Sandbank (1) bildet, im Wesentlichen nicht angehoben wird.
  3. Verfahren nach jedem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die mindestens eine Sandbank (1) regelmäßig angehoben wird.
  4. Verfahren nach Anspruch (3), dadurch gekennzeichnet, dass die mindestens eine Sandbank (1) jährlich angehoben wird.
  5. Verfahren nach Anspruch (4), dadurch gekennzeichnet, dass das durchschnittliche jährliche Anheben der mindestens einen Sandbank (1) zwischen 0,2 und 5 cm beträgt.
  6. Verfahren nach jedem der vorherigen Ansprüche, dadurch gekennzeichnet, dass mindestens eine Sandbank (1) auf eine Kammhöhe angehoben wird, die mindestens die niedrigste astronomische Tide (LAT = "Lowest Astronomical Tide") erreicht.
  7. Verfahren nach jedem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die mindestens eine Sandbank (1) eine Entfernung zur Küste aufweist, die maximal 20 km, besser noch maximal 10 km und am besten maximal 5 km beträgt.
  8. Verfahren nach jedem der vorherigen Ansprüche, wobei die Wasserbarriere (10) abgetragen wird, nachdem der Sandkörper (12) die natürliche Neigung erreicht hat.
  9. Verfahren nach jedem der vorherigen Ansprüche 1 bis 7, dadurch gekennzeichnet, dass die Wasserbarriere (10) eine Schutzschicht aus Steinen, Betonblöcken und/oder offenem Steinasphalt aufweist.
  10. Verfahren gemäß Anspruch 8 oder 9, dadurch gekennzeichnet, dass die Sandbank (1) mit Sand oder anderem Bettmaterial vor der Schaffung der Wasserbarriere (10) auf eine Höhe unterhalb des Niedrigwasserpegels angehoben wird.
EP20090172798 2009-10-12 2009-10-12 Verfahren zum Schützen von Küsten und dergleichen Not-in-force EP2312059B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20090172798 EP2312059B1 (de) 2009-10-12 2009-10-12 Verfahren zum Schützen von Küsten und dergleichen

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Application Number Priority Date Filing Date Title
EP20090172798 EP2312059B1 (de) 2009-10-12 2009-10-12 Verfahren zum Schützen von Küsten und dergleichen

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EP2312059A1 EP2312059A1 (de) 2011-04-20
EP2312059B1 true EP2312059B1 (de) 2014-07-23

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EP20090172798 Not-in-force EP2312059B1 (de) 2009-10-12 2009-10-12 Verfahren zum Schützen von Küsten und dergleichen

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104504180B (zh) * 2014-12-08 2017-05-10 中国矿业大学 一种黄土沟壑径流下采动水害类型划分方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3564853A (en) 1969-03-24 1971-02-23 Zoltan Csiszar Method of controlling erosion on seashores
US4367978A (en) 1980-09-15 1983-01-11 Cecil Schaaf Device for preventing beach erosion
DE3503031A1 (de) * 1985-01-30 1986-07-31 Hoyer, Erich, 2433 Grömitz Verfahren und anlage zum erhalten, verbessern und vergroessern von kuestenbereichen
BE1001971A6 (nl) 1988-05-19 1990-04-24 Bitumar Werkwijze voor het vervaardigen van een waterdoorlatende bitumensamenstelling met open structuur en aldus bekomen waterdoorlatende bitumensamenstelling.

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