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APPLICATION

Coastal protection

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Coastal protection

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Coastalprotection Waterforcesactingonstructuresincoastalandforeshoreenvironmentsarecomplex.Theynormallyconsistofacombinationofwave,tidalandcurrentforces.Waveforcesmaybeduetocoastalwaves,shipwavesand/orstormwavesdependingonthelocationofthestructure.TheuseofNovaGabionsandMattressesinthecoastalandforeshoreenvironmentshasprovedverysuccessfulbecausetheycombinemonolithicandflexiblemass,coupledwithhighpermeabilityandaroughsurface.ThehighpermeabilityandroughsurfaceofNovaGabionandMattressrevetmentsmakethemveryeffectiveindissipatingandabsorbingwaveenergy,thusreducingtheextentofwaverun-upandover-topping.Itisimperativethatonlyzinc/polymercoatedorGalfan/polymercoatedNovaGabionsandMattressesbeusedinacoastalenvironment.Thepolymercoatingprotectsthewirefromcorrosionduetotheconcentrationofsaltinthewater.andMattressesinallcoastalandforeshoreItisalsoimperativethatasuitablegeotextilefilterbeusedbeneaththeNovaGabionsengineeringapplications. Coastalrevetments NovaGabionandMattressrevetmentsareeffectiveinpreventingscouranderosionofslopesprovidedthewaveactionisnotextreme.TherevetmentshouldbeadequatelyanchoredatthetoptopreventitslidingorbeingdraggedunderminingbyaMattressapronorGabionoutofalignmentbywavedrawdownforces.Thetoeoftherevetmentshouldbeprotectedfromfoundationbelowthelowestexpectedscourdepth.ThethicknessoftheNovaMattressorGabionrevetmentshouldbedesignedtopreventupliftandslidingduetowaveaction.Brown(1978a&b)formulatedarelationshiptodeterminetherequiredNovaGabionorMattressthicknesstoresistwaveforces.Whererevetmentslopesarelessthan45°eitherNovaMattressesorGabionsmaybeuseddependingontheirthicknessrequirements.Forslopesgreaterthan45°,NovaGabionsshouldbeusedandthestructureshouldbeanalyzedonthebasisofbothdesignwaveheightandgravityretainingstructure.WhereNovaGabionsareusedonslopesof45°orgreater,aNovaMattressapronshouldalwaysbeprovidedtopreventunderminingofthebaseoftheNovaGabionwall. Beachprotectionseawall Theusualpurposeofseawallsistopreventerosionandfloodingandtoretainaseafrontage.ThemajoradvantagesofNovaGabionseawallsoverotherformsofseawallconstructionaretheirrelativelylowcost,theirflexibility,theeasewithwhichtheycanbeaddedto,andtheirabilitytoblendinwiththelocalsurroundingsoveraperiodoftime.AnotheradvantageistheirhighpermeabilitywhichallowsthenaturaloutflowofgroundwaterthroughtheGabionwall.Thefollowingfactorsarecriticaltodesign.First,thefoundationfortheseawallshouldbeadequatelyprotectedagainstlocalscourandundermining.Second,theseawallfootingshouldbeplacedbelowthelowestleveltowhichtheforeshoreislikelytodrop.Third,ananti-scourapronshouldbeconstructedtofurtherprotectthetoeoftheseawall.NovaGabionsandMattresseshavefoundextensiveuseforbeachprotectionseawallapplicationsbecausetheirroughsurfaceacceleratesabuildupofsand(moresothansmoothfacedstructures).WaterproofingofReservoirs,LakesandChannelsWaterproofingofreservoirs,lakesandchannelsservesmanyfunctions,whethertoprovidestormwaterattenuationponds,orpreventcontaminatedwaterpollutingtheground.Thesecontainmentstructuresareusedwithinmanymarketsectorsincluding;–Slurrypondsinagriculture–Leachatelagoonsinmineworkings–Stormwaterattenuationpondswithinhighwaysandinfrastructure–Storagepondswithinindustry–ReservoirsforwatersupplyVaryingconditionsandrequirements.Thedemandsandexposureconditionsvaries(vary)accordingtotheneedsofthemarketsector,forexampletheminingindustrywillrequirethecontainmentofaggressivechemicalsandpreciousleachates.

发布时间：

2019/03/05 17:12

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Product description

Coastal protection

Water forces acting on structures in coastal and foreshore environments are complex. They normally consist of a combination of wave, tidal and current forces. Wave forces may be due to coastal waves, ship waves and/or storm waves depending on the location of the structure. The use of Nova Gabions and Mattresses in the coastal and foreshore environments has proved very successful because they combine monolithic and flexible mass, coupled with high permeability and a rough surface. The high permeability and rough surface of Nova Gabion and Mattress revetments make them very effective in dissipating and absorbing wave energy, thus reducing the extent of wave run-up and over-topping. It is imperative that only zinc/polymer coated or Galfan /polymer coated Nova Gabions and Mattresses be used in a coastal environment. The polymer coating protects the wire from corrosion due to the concentration of salt in the water. and Mattresses in all coastal and foreshore It is also imperative that a suitable geotextile filter be used beneath the Nova Gabions engineering applications.

Coastal revetments

Nova Gabion and Mattress revetments are effective in preventing scour and erosion of slopes provided the wave action is not extreme. The revetment should be adequately anchored at the top to prevent it sliding or being dragged undermining by a Mattress apron or Gabion out of alignment by wave draw down forces. The toe of the revetment should be protected from foundation below the lowest expected scour depth. The thickness of the Nova Mattress or Gabion revetment should be designed to prevent uplift and sliding due to wave action. Brown (1978a & b) formulated a relationship to determine the required Nova Gabion or Mattress thickness to resist wave forces. Where revetment slopes are less than 45° either Nova Mattresses or Gabions may be used depending on their thickness requirements. For slopes greater than 45°, Nova Gabions should be used and the structure should be analyzed on the basis of both design wave height and gravity retaining structure. Where Nova Gabions are used on slopes of 45° or greater, a Nova Mattress apron should always be provided to prevent undermining of the base of the Nova Gabion wall.

Beach protection seawall

The usual purpose of seawalls is to prevent erosion and flooding and to retain a sea frontage. The major advantages of Nova Gabion seawalls over other forms of seawall construction are their relatively low cost, their flexibility, the ease with which they can be added to, and their ability to blend in with the local surroundings over a period of time. Another advantage is their high permeability which allows the natural outflow of groundwater through the Gabion wall. The following factors are critical to design. First, the foundation for the seawall should be adequately protected against local scour and undermining. Second, the seawall footing should be placed below the lowest level to which the foreshore is likely to drop. Third, an anti-scour apron should be constructed to further protect the toe of the seawall. Nova Gabions and Mattresses have found extensive use for beach protection seawall applications because their rough surface accelerates a build up of sand (more so than smooth faced structures).

Waterproofing of Reservoirs, Lakes and Channels

Waterproofing of reservoirs, lakes and channels serves many functions, whether to provide storm water attenuation ponds, or prevent contaminated water polluting the ground. These containment structures are used within many market sectors including;

– Slurry ponds in agriculture

– Leachate lagoons in mine workings

– Storm water attenuation ponds within highways and infrastructure

– Storage ponds within industry

– Reservoirs for water supply

Varying conditions and requirements. The demands and exposure conditions varies (vary) according to the needs of the market sector, for example the mining industry will require the containment of aggressive chemicals and precious leachates.