《河南水利与南水北调》2023年第2期百家谭宽顶堰闸孔自由出流流量系数推求分析吴轩（江西赣禹工程建设有限公司，江西南昌330209）摘要：宽顶堰闸孔出流问题是水利工程中十分普遍的水力现象，为保证设计方案的合理性、确保堰体闸孔工程作用的顺利发挥，必须在确定出宽顶堰闸孔淹没出流条件以及出流具体特征的基础上进行淹没系数取值的合理确定。基于此背景，以潦河灌区泄洪闸、冲沙闸为例，先进行了潦河灌区原解放闸坝宽顶堰闸孔淹没出流情况的理论分析，并提出所采用的水平底闸孔淹没出流计算方法对于宽顶堰淹没出流现象的判别以及淹没系数计算并不适用，并引入了淹没出流修正系数；此后对灌区泄洪闸、冲沙闸闸孔淹没出流过程展开模型试验，并结合试验数据进行了宽顶堰平板闸门和弧形闸门闸后收缩断面特性与闸孔出流及过流能力之间关系的模拟分析，可供水力计算及水利工程运行管理参考使用。关键词：宽顶堰；闸孔；自由出流；流量系数；推求中图分类号：TV13文献标识码：A文章编号：1673-8853（2023）02-0108-03CalculationandAnalysisofFreeDischargeCoefficientofWide-crestedWeirSluiceWuXuan（JiangxiGanyuEngineeringConstructionCO.LTD.,Nanchang330209,China）Abstract：Theproblemofgateoutflowofwide-crestedweirisaverycommonhydraulicphenomenoninhydraulicengineeringpractice.Inordertoensuretherationalityofthedesignschemeandthesmoothplayofweir-bodysluiceproject,itisnecessarytodeterminethereasonablesubmergencecoefficientonthebasisofdeterminingthesubmergencedischargeconditionsandspecificcharacteristicsoftheoutflowfromthewide-crestedweirsluice.Basedonthisbackground,thefloodsluiceofLiaoheIrrigationDistrictandChongshaSluiceasexample,atheoreticalanalysisonthefloodingandoutflowofthesluiceholesofthewide-crestedweiroftheoriginalJiefangSluiceDaminLiaoheIrrigationDistrictisfirstmadeinthispaper.Then,itisproposedthatthemethodusedtocalculatethesubmergedoutflowfromhorizontalbottomsluiceisnotsuitableforthediscriminationofsubmergedoutflowphenomenonandthecalculationofsubmergedcoefficientofwidetopweir.Thecorrectioncoefficientofsubmergedoutflowisintroduced.Afterthat,modeltestsarecarriedoutontheprocessofflooddischargesluiceandsand-washingsluice.Combinedwiththetestdata,th...
