黄河中游多沙粗沙区治理对黄河下游减淤影响研究

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GaoYajun2007.6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Outlinetheareaofthesedimentoverloadedandcoarsesedimentregiontoestimatestheerosionandsedimentationofriver’slowerreaches2、多沙粗沙区治理分区的确定Thedefineofsub-areainsediment-ladenandcoarsesandareacontrolling1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-ladenandcoarsesandareaofthemiddleyellowriver22.812.069.277.282.40102030405060708090面积比产水比全沙比0.05mm粗泥沙比0.1mm粗泥沙比（%）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ContributionofsedimentproductionincoarsesandconcentratedsourceregionofthemiddleYellowRiver4.12.321.734.554.023.927.334.547.668.501020304050607080面积比产水比全沙比0.05mm粗泥沙比0.1mm粗泥沙比（%）与黄土高原水土流失区比与多沙粗沙区比结论：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-ladenandcoarsesandareacontrolling2.1划分原则DividingPrinciples1.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/(km2•a)和700t/(km2•a)为指标，对多沙粗沙区进行进一步划分。Afterverification,wetakethediameterlargerthan0.1mmindiameteraslimitsofcoarsesediment,andtake1,400tonssedimentmodulus(km2•a)and700tons(km2•a)whichhavelargerthan0.1mmdiametersedimentasanindicatortofurtherdividethesediment-ladenandcoarsesandareas.2.3划分结果DividingResult1区：F=1.88万km22区：F=2.06万km23区：F=3.92万km2Way1：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Outlinetheareaofthesedimentoverloadedandcoarsesedimentregiontoestimatestheerosionandsedimentationoflowerreachesofariver3多沙粗沙区各治理分区来沙对下游河道冲淤影响的估算OutlinetheareaofthesedimentoverloadedandcoarsesedimentregiontoestimatestheerosionandsedimentationoflowerreachesofariverProjectUnitSedimentreductiontargetsZone1Zone2Zone3thesedimentoverloadedandcoarsesedimentregionAreakm21.882.063.927.86Surfacewaterquantity*108m310.197.9913.0031.18Sedimenttransportingquantity*108t2.771.903.348.01Sedimentreductionquantity*108t10%0.280.190.330.8020%0.550.380.671.6030%0.830.571.002.4050%1.390.951.674.0170%1.941.332.345.6190%2.491.713.017.21Sedimentationreductionquantity*108t10%0.190.100.100.3920%0.390.190.200.7830%0.580.290.301.1750%0.970.480.501.9570%1.360.670.702.7290%1.750.860.903.503.2多沙粗沙区不同程度治理后对黄河下游减淤量的估算Outlinetheareaofthesedimentoverloadedandcoarsesedimentregiontoestimatestheerosionandsedimentationoflowerreachesofariver.时段period项目Project来沙(亿t）Comesilt下游河道淤积(亿t）depositioninthelowerreaches单位来沙淤积比Comesiltdepositionratio来沙贡献(亿t）Comesiltcontribution1950-2000六站Sixstation13.513.387.868.0125%2.001.882.88033%0.95way2Accordingtothesixstationandlowerreachessiltdepositionratiotocalculatesiltdepositionperunit.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,alongwitheachgovernmentdistrictimplementationconservationofwaterandsoilcomprehensiveprogramofdegreeenhancement,blockedreducesenterstheyellowsedimentmore,thecorrespondingreducedriverdepositionquantitytobealsomore.Thanksforyourattention!