简介：Depositionofcoarsesedimentattheentranceofareservoirisformanyreasonsanundesiredsideeffect.Besideslossofstoragevolumewhichconcernsalsofinesedimentcarriedinsuspension,thecoarsermaterialtransportedasbedload-particularlythegravelfraction-istocauseadditionaleffectsupstreamaswellasdownstreamofthereservoir.Upstreamthedepositionsattheentranceofthereservoirmayresultinabackupeffectatfloodeventswithincreasingriskofinundations,anddownstreamofthereservoirthedeficiencyofcoarsematerialinevitablyresultsindegradationoftheriverbed.Intheframeofarealhydropowerplant(BadTOlzinSouthernBavaria)thepossibilityofsluicingcoarsematerialthroughthereservoirtowardsdownstreamhasbeenstudiedandfinallyrealized.Thesluicingprocesshasbeencoupledwithwaterleveldrawdownatfloodeventsofappropriatecharacteristics.Thesluicingactionwascontrolledbymonitoringandevaluatingenvironmentallysignificantparameters(sedimentconcentration,etc.).Theresultswerepromisingandvaluablehintsforfurtheractionsofthiskindcouldbeextracted.

简介：Inthisstudy,accumulationanddistributionofPb,Cu,Zn,Co,Ni,MnandFeinwater,bottomsedimentsandfourplantspecies(Myriophyllumverticillatum,Hydrocharismorsus-ranae,NymphaeaalbaandTyphalatifolia)wereinvestigatedinCernekLakeofKizilirmakDelta.TheKizilirmakDeltaisoneofthelargestnaturalwetlandsofTurkeyanditisprotectedbytheRamsarconventionsince1993.Selectedphysico-chemicalparameterssuchaspH,conductivityanddissolvedoxygenandalsotracemetalconcentrationsweremonitoredinwater.Alltheparametersobtainedwerefoundhigherthanthatofthenationalstandardsfortheprotectedlakesandreserves.TheaccumulatedamountsofvarioustracemetalsinbottomsedimentsandwetlandplantswerefoundinthefollowingorderofFe>Mn>Zn>Ni>Co>Cu>PbandFe>Mn>Zn>Ni>Corespectively.ThehistoricaltracemetalintakeofMyriophyllumverticillatum,Hydrocharismorsus-ranae,TyphalatifoliaandNymphaeaalbawereobtainedhigherthanthatofthetoxicmetallevelsandtheseplantsmaybeacceptedasaccumulatorsforthedetectedtracemetalsandalsobioindicatorsinthehistoricallypollutednaturalareas.