《河南水利与南水北调》2023年第5期智慧水利基于FLOW-3D的明渠壅水断面流速特征研究杨新茂(甘肃省疏勒河流域水资源利用中心双塔灌区管理处,甘肃瓜州736100)摘要:随着传感器技术的发展,渠道流量测量技术有了新的突破,目前渠道流速大多是根据点流速进行计算,但在渠道内因阻滞作用的影响,同一断面上的水流速度分布会随着水深的不同而不同。为探讨不同水深边界情况下,明渠剖面流速分布特性。文章截取某梯形渠道100m渠段,利用FLOW-3D进行建模,模拟了不同的下游壅水情况。通过对不同水深情况下剖面流速分布的研究,采用固定流速系数的方法进行分析,给出了在壅水高度小于20cm的情况下,可以达到测量精度(误差不超过±10%)的水流速度系数。通过模拟计算,拟合出了水流速度系数随水深变化的曲线,对流速系数进行修正后可使测流误差小于1.40%。关键词:数值模拟;水面流速系数;渠道壅水中图分类号:TV133文献标识码:A文章编号:1673-8853(2023)05-0123-03StudyonFlowVelocityCharacteristicsofBackwaterSectioninOpenChannelBasedonFLOW-3DYANGXinmao(GuazhouShuangtaIrrigationDistrictManagementOffice,ShuleRiverRiverBasinWaterResourcesUtilizationCenter,Guazhou736100,China)Abstract:Withthedevelopmentofsensortechnology,thechannelflowmeasurementtechnologyhasanewbreakthrough.Atpresent,thechannelflowvelocityismostlycalculatedaccordingtothepointflowvelocity.However,thedistributionofwatervelocityonthesamesectionvarieswiththedepthofwaterbecauseoftheblockingeffectinthechannel.Inordertostudythecharacteristicsofvelocitydistributioninopenchannelsectionunderdifferentwaterdepthboundaryconditions,a100mtrapezoidalchannelsectionisinterceptedandFLOW-3Dmodelisusedtosimulatedifferentbackwaterconditionsdownstream.Basedonthestudyofvelocitydistributioninprofileunderdifferentwaterdepths,themethodoffixedvelocitycoefficientisusedtoanalyzethevelocitydistribution.Theresultsaregivenwhenthebackwaterheightislessthan20cm,theflowvelocitycoefficientwithmeasurementaccuracy(errornotexceeding±10%)canbeachieved.Thecurveofflowvelocitycoefficientvaryingwithwaterdepthisfittedthroughsimulationcalculation.Theerrorofflowmeasurementislessthan1.4%afterthevelocitycoefficientis...