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Channelling Works

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Channelling Works

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ChannellingWorksThecanalizationofawatercourseinvolvesconstructingachannelwithadesignedcross-sectiontomeettheflowcharacteristicsandcapacityrequired.Thiscanbetocontrolthemeanderingofariverthroughabuiltuparea,orinthevicinityofinfrastructure.Withoutthismanagedcontainment,thewatercoursewouldbefreetoerodeandcauseproblems.Wherechannelstransportcleanwaterflowthroughpollutedground,orvice-versa,thechannelmaybelinedtorenderitimpermeable,forexampleinagriculturalirrigationschemes.Whyaprotectiveliningisneeded.Tomaintainthelong-termperformanceofthesechannels,aprotectiveliningisoftenappliedtothebanksand,ifrequired,tothechannelbed.Withoutprotection,erosionofthechannelwilloccurasaresultofthehydraulicshearstressesactingonthesoil’ssurface.Thechannelliningservesmanyfunctions:–reductionofwaterlossesbyseepage–improvedbankstability–erosionprotection–provisionofapredeterminedvalueofbankroughness,hencechannelflowcapacityLongitudinalProtectionLongitudinalprotectionstructuresarehydraulicstructureswiththeirlengthparalleltotheriverflow.Thesestructuresareoftenbuilton,orsupporting,existingnaturalbanksandtypicallyextendforaconsiderabledistance.Theyareusedforavarietyofpurposes,suchas:–erosioncontrol–controlofmeandering–containmentofthenormalflowchannel–floodprotectionCounteractingnaturalforcesinwatercourses.Atrainedwatercoursereducesland-losscausedbyerosion,yettheinherenth2longitudinalortransversecurrentscanstillerodetheriverbanksorthetoeofthebanksmakingthemunstable.Thereforetheriverbankprotectionsolutionmustbesufficientlyrobustandwell-designedtocounteracttheseforces.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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Channelling Works
The canalization of a water course involves constructing a channel with a designed cross-section to meet the flow characteristics and capacity required. This can be to control the meandering of a river through a built up area, or in the vicinity of infrastructure. Without this managed containment, the water course would be free to erode and cause problems. Where channels transport clean water flow through polluted ground, or vice-versa, the channel may be lined to render it impermeable, for example in agricultural irrigation schemes.
Why a protective lining is needed. To maintain the long-term performance of these channels, a protective lining is often applied to the banks and, if required, to the channel bed. Without protection, erosion of the channel will occur as a result of the hydraulic shear stresses acting on the soil’s surface.The channel lining serves many functions:
– reduction of water losses by seepage
– improved bank stability
– erosion protection
– provision of a predetermined value of bank roughness, hence channel flow capacity
Longitudinal Protection
Longitudinal protection structures are hydraulic structures with their length parallel to the river flow. These structures are often built on, or supporting, existing natural banks and typically extend for a considerable distance. They are used for a variety of purposes, such as:
– erosion control
– control of meandering
– containment of the normal flow channel
– flood protection
Counteracting natural forces in water courses. A trained water course reduces land-loss caused by erosion, yet the inherent h2 longitudinal or transverse currents can still erode the river banks or the toe of the banks making them unstable. Therefore the river bank protection solution must be sufficiently robust and well-designed to counteract these forces.
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.