黄河中游多沙粗沙区治理对黄河下游减淤影响研究.ppt

黄河中游多沙粗沙区治理对黄河下游减淤影响研究TheImpactResearchofControllingtoSediment-ladenandCoarseSandAreaintheMiddleonSedimentationReductionoftheLowerYellowRiver,黄委会水文局HydrologyBureau，YRCC高亚军GaoYajun,2007.6,汇报内容CONTENT,1、多沙粗沙区和粗泥沙集中来源区简介Introductionofsediment-ladenandcoarsesandareaandcoarsesandconcentratedsourceregionofthemiddleYellowRiver,3、多沙粗沙区各治理分区来沙对下游河道冲淤影响的估算Outlinetheareaofthesedimentoverloadedandcoarsesedimentregiontoestimatestheerosionandsedimentationofriverslowerreaches,2、多沙粗沙区治理分区的确定Thedefineofsub-areainsediment-ladenandcoarsesandareacontrolling,1多沙粗沙区和粗泥沙集中来源区简况Introductionofsediment-ladenandcoarsesandareaandcoarsesandconcentratedsourceregionofthemiddleyellowriver,多沙粗沙区和粗泥沙集中来源区的位置Thelocationofthesediment-ladenandcoarsesandareaandthecoarsesandconcentratedsourceregion,多沙粗沙区在黄河中游的产沙贡献ContributionofsedimentproductioninSediment-ladenandcoarsesandareaofthemiddleyellowriver,结论：多沙粗沙区是拦截入黄泥沙的重点区Conclusion:Thesediment-ladenandcoarsesandareaisthemostimportantareatoheadoffthesedimentintoYellowRiver.,粗泥沙集中来源区在多沙粗沙区中的产沙贡献ContributionofsedimentproductionincoarsesandconcentratedsourceregionofthemiddleYellowRiver,结论：粗泥沙集中来源区是拦截入黄粗泥沙的重中之重地区Conclusion:coarsesandconcentratedsourceregionisthemostimportantareatoheadoffcoarsesedimentintoYellowRiver.,2多沙粗沙区治理分区的划分Thedefineofsub-areainsediment-ladenandcoarsesandareacontrolling,2.1划分原则DividingPrinciples,1.快速减少下游河槽粗泥沙淤积；TherapiddegradationofthecoarsesandofChannelssedimentationdepositioninlower.2.治理面积相对较小，拦减粗泥沙量相对较多；Arelativelysmallareaandtherelativelylargeamountofcoarsesedimentreductioninterceptions.,3.对入黄水资源影响较小；LittleImpactoftheYellowRiverEnteredwaterResources.4.当地生态环境改善与下游河道减淤同步。PrincipletoimprovetheecologicalenvironmentandinthelowerreachesMinimizingdepositionofsynchronicity.,2.2分区指标Dividingindex,经过论证，以粒径0.1mm为粗泥沙界限，以粒径0.1mm的粗泥沙输沙模数1400t/(km2a)和700t/(km2a)为指标，对多沙粗沙区进行进一步划分。Afterverification,wetakethediameterlargerthan0.1mmindiameteraslimitsofcoarsesediment,andtake1,400tonssedimentmodulus(km2a)and700tons(km2a)whichhavelargerthan0.1mmdiametersedimentasanindicatortofurtherdividethesediment-ladenandcoarsesandareas.,2.3划分结果DividingResult,1区：F=1.88万km22区：F=2.06万km23区：F=3.92万km2,Way1：IndexselectionAccordingtotheaboveresultsandtheresearchresultsofzhangren,forestimatingtheeffectofdepositionanderosioninthelowerreachesoftheriver,Ifthefirst,secondandthirddistrictswereintercepted100milliontofsediment,thereductionofthelowerreachesoftheriverestimatedat0.7milliontons,0.5milliontonsand0.3milliontonsbylowervolume.,3多沙粗沙区各治理分区来沙对下游河道冲淤影响的估算Outlinetheareaofthesedimentoverloadedandcoarsesedimentregiontoestimatestheerosionandsedimentationoflowerreachesofariver,3多沙粗沙区各治理分区来沙对下游河道冲淤影响的估算Outlinetheareaofthesedimentoverloadedandcoarsesedimentregiontoestimatestheerosionandsedimentationoflowerreachesofariver,3.2多沙粗沙区不同程度治理后对黄河下游减淤量的估算Outlinetheareaofthesedimentoverloadedandcoarsesedimentregiontoestimatestheerosionandsedimentationoflowerreachesofariver.,way2Accordingtothesixstationandlowerreachessiltdepositionratiotocalculatesiltdepositionperunit.Wehadtheratiosare25%and33%,thedepositionsare2and0.95hundredmilliontons.,3多沙粗沙区各治理分区来沙对下游河道冲淤影响的估算Outlinetheareaofthesedimentoverloadedandcoarsesedimentregiontoestimatestheerosionandsedimentationoflowerreachesofariver,主要结论Conclusions多沙粗沙区得到不同程度治理后，在减少入黄沙量的同时，也减少了下游河道淤积量，随着各治理分区实施水土保持综合治理程度的提高，拦减的入黄泥沙越多，相应的减少河道淤积量也越多。AftertheSediment-ladenandCoarseSandAreaisunderthevaryingdegreegovernment,whilereducesintotheyellowsandquantity,alsoreducedthelowerreachessiltdepositionquantity,alongwitheachgovernmentdistrictimplementationconservati