黄河下游游荡性河段浮桥建设对河势及防洪的影响分析.pptx

EFFECTANALYSISOFFLOATBRIDGEONRIVERREGIMECHANGEANDFLOODCONTROLONWANDERINGREACHESOFTHEYELLOWRIVER黄河下游游荡性河段浮桥建设对河势及防洪的影响分析李永强刘筠张靖LiYongqiangLiuYunZhangJingReconnaissanceDesignandResearchInstituteofYellowRiverHenanAdministrationBureauBackgroundofthestudy项目研究背景封开浮桥简介浮桥建设对水流条件影响的分析浮桥建设对河势的可能影响分析结论和建议OutlineofthePresentationMoreandmorefloatbridgeshavingbeenbuiltonthelowerYellowRiverduetoEconomicdevelopmentSofar,53bridgesinShandongProvinceSince2000,,andthepossibleeffectonfloodcontrolcanprovidepositiveandscientificbasisforthefuturefloatbridgeconstructionRiverregimeevolutionofDagongtowang’-,andthemainflowis4mdeepinaverageThefloatbridgeis880mlongintotalandrunsoverthenewfloodplainandthemainchannel,,(500m3/s,1000m3/s,2000m3/sand4000m3/s).(m3/s)RiverWidthB(m)AverageWaterDepthH(m)AverageFlowVelocitybeforeBridgeBuildingV(m/sBackwaterHeightduetobearingboat(m)Waterrisingbeforethebearingboat(m)BackwaterExtent(m)Backwaterheightnearth