泾河流域淤地坝拦沙对降雨的响应分析.pdf

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1、西安理工大学学报JournalofXi’anUniversityofTechnology(2010)Vo1．26No．3249文章编号：10064710(2010)03-0249-06泾河流域淤地坝拦沙对降雨的响应分析冉：k)11，李占斌，申震洲，曾茂林(1．西安理工大学西北水资源与环境生态教育部重点实验室，陕西西安710048；2．黄河水利委员会黄河水利科学研究院，河南郑州450003)摘要：采用回归统计方法对泾河流域淤地坝拦沙对降雨的响应关系进行了分析。通过降雨一产洪产沙一淤地坝拦沙关系的定量研究，提出了不同年代淤地坝拦沙量与降雨因

2、子的响应关系式及其阈值；从实用角度给出了淤地坝年拦沙量的预估公式；简析了淤地坝拦沙量与减蚀量的尺度关系。结果表明：泾河流域淤地坝年拦沙量大于阈值1000万t／a对应的降雨阈值分别为最大1日降雨量大于40mm、汛期降雨量大于350mm和年降雨量大于450mm；黄河中游地区不同空间尺度流域的淤地坝拦沙量与减蚀量均呈正比关系。随着流域空间尺度(面积)的减小，淤地坝减蚀量占拦沙量的比重呈增大趋势。关键词：降雨闲值；拦沙量；减蚀量；尺度；淤地坝；泾河中图分类号：S157．1文献标志码：ATheSoil—SavingDamRetainSandRes

3、pondtoRainfallinJingheRiverBasinRANDa．chuan'，LIZhan—bin，SHENZhen．zhou，ZENGMac．1in(1．KeyLabofNorthwestWaterResourcesandEnvironmentEcologyofMOE，Xi’anUniversityofTechnology，Xi’an710048，China；2．YellowRiverInstituteofHydraulicResearch，YellowRiverConservancyCommission，Zhengzho

4、u450003，China)Abstract：Theregressiveandstatisticanalysismethodisusedtoanalysestheeffectofsoil-savingdamtochecksedimentupontheresponserelationshiptotherainfallintheJingheRivervalleyinthispaper．Theresponserelationshipequationbetweenthesoil—savingdamcheckingsedimentsandrain

5、fallfactorsindif-ferentyearsandtherainfallthresholdaresuggestedthroughthequantitativestudiesofrelationshipsofrainfall—floodsediment—yield—soil—savingdamindifferentyears，wherebythepredictionformulafortheyearlysedimentcheckbysoil-savingdamisgivenasviewedfromthepracticalapp

6、lication，andthespa-tialscalerelationshipbetweenthesedimentcheckbysoil-·savingdamanderosionreductionisbrieflyana—-lyzed．Theresultsindicatethatwhentheyearlysedimentcheckbysoil．savingdamintheJinheRiverva1．1eyislargerthanthethresholdvalueof10t／a．theresponserainfallthresholdv

7、aluesare40mmofthebiggestrainfallinoneday，over350mmofrainfallintherainyseasonandover450mmofrainfallinayearrespectively．Accordingly，thesedimentcheckbysoil—savingdamwithdifferentspatialscalesintheYellowRiverValleyinfoundtobeinpositiveproportionwiththeamountofsoileroded．With

8、adecreaseinthevalleyspatialscale(area)，thepercentageofsoilerosionreductionbysoil—savingdaminsedimentche