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《三门峡水库降水冲刷机理与规律研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、人民黄河Vo1.34,No.10第34卷第10期2012年1O月YELLOWRIVEROet..2012【水文·泥沙】三门峡水库降水冲刷机理与规律研究李昆鹏,马怀宝,王瑞,王岩(1.黄河水利科学研究院水利部黄河泥沙重点实验室,河南郑州450003;2.开封市环境监测站,河南开封475000)摘要:根据三门峡水库降水冲刷实测资料,分析河床形态调整及其过程、出库含沙量过程等与来水来沙条件、库区蓄水状态及其变化过程的响应关系,研究库区水沙运动规律,探讨力与水协同作用下降水冲刷机理与关键影响因素。研究表明:①三门峡水
2、库滞洪排沙期6个冲刷时段冲刷集中在黄淤12一黄淤36河段,受水库调度和排沙能力的影响,最大输沙强度出现在流量2000~3000m/s;②坝前水位从302nl下降到295m时,库区冲刷效果最好,如果水位再降低,冲刷效果并不显著;③利用清华大学与陕西水科所公式计算输沙率,在选择系数值时,需具体分析水库的淤积物组成、冲刷发展的程度等影响因素。关键词:降水冲刷;滞洪排沙;敞泄排沙;冲淤形态;输沙率;三门峡水库中图分类号:TV145;TV142文献标识码:Adoi:10.3969/j.issn.1000—1379.20
3、12.10.008ResearchonWaterLevelDownfallErosionMechanismandLawofSanmenxiaReservoirLIKun—peng,MAHuai—bao,WANGRui,WANGYan(1.KeyLaboratorytheYellowRiverSedimentofMinutryofWaterResource,YellowRiverInstituteofHydraulicResearch,Zhengzhou450003,China;2.KaifengEnviron
4、mentalMonitoringStation,Kaifeng475000,China)Abstract:AccordingtothedataofwaterleveldownfallerosioninSanmenxiaReservoir,thepaperanalyzedtheresponserelationbetweenriverbedaajustment,outletsedimentconcentrationandincomingwaterandsedimentconditionandwaterstorag
5、e,studiedthemovementlawofwaterandsedimentinreservoiranddiscussedwaterleveldownfal1erosionmechanismandkeyinfluencingfactorsunderthecooperativeactionofwaterandforce.Theresultsshowthat:①duringSanmenxiaReservoirflooddetentionanddesiltingperiod,scouringisconcent
6、ratedbetweenthecrosssectionfromNo.12toNo.36insixtimeintervals.Affectedbythereservoirregulationandsandreleasecapacity,maximumsedimenttransportintensityap—pearswhenthedischargeisbetween2000and300013:1/s.②Whenwaterlevelinfrontofdamdecreasesfrom302mto295m,thefl
7、ushingper-formanceisthebest.Ifthewaterlevelfurtherdecreases,theflushingisnotsignificantanymore.③UsingtheformulaofTsinghHaUniversityandShanxiWaterInstitutetocalculatethesedimenttransportrate,influencefactorslikereservoirdepositioncompositionandthedegreeofsco
8、uring,itshouldspecificallyanalyzethevalueofcoeficientwhenitisselected.TheresearchresultscanbesuppliedforreferencesforreservoirregulationandsedimentationreductioninXiaolangdiReservoir.Keywords:waterleve
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