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时间:2020-05-04
《基于洪水过程的黄河下游游荡型河段冲淤特性研究-论文.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、第5期总第195期浙江水利科技No.5r0talNo.1952014年9月ZhejiangHydrotechnicsSeptember2014基于洪水过程的黄河下游游荡型河段冲淤特性研究孙东坡’,张晓雷’.一,王鹏涛’,刘明潇。,董明家’(1.华北水利水电大学水利学院,河南郑州450011;2.武汉大学水资源与水电_Y-程科学国家重点实验室,湖北武汉430072;3.西安理工大学水利水电学院,陕西西安710048)摘要:为了把握洪水泥沙过程对黄河下游游荡型河段河床冲淤调整的影响,通过平面二维水沙数值模拟与实测资料分析,进行了不同水沙过程下黄河下游河道冲淤规律的探讨。研究发现
2、不同洪水泥沙过程对河槽的调整塑造有明显不同的影响,大洪峰流量塑造的河槽在非洪峰期难以维持原有输沙强度。主槽累积刷槽效应与洪水泥沙过程有很好的响应关系,塑造出最适宜河床断面形态的洪水过程才能实现最佳输沙效率。在不同量级漫滩洪水条件中,对应洪峰6000m3/s的洪水过程,塑造的断面形态具有最大累积刷槽效应,故可采用其作为黄河下游漫滩洪水的调控指标。关键词:洪水过程;河床形态;黄河下游;响应;累积效应中图分类号:TV147文献标识码:A文章编号:1008—701X(2014)05.0030-04TheResearchontheScour——siltingCharacteristi
3、csBasedonFloodProcessinWanderingReachoftheLowerYellowRiverSUNDong-po,ZHANGXiao-leiI,WANGPeng-tao,LIUMhlg-xiaos,DONGMing.jial(1.ColegeofWaterConservancy,NorthChinaUniversityofWaterResourcesandElectricPower,Zhengzhou450011,Henan,Claim;2.StateKeyLaboratoryofWaterResourcesandHydropowerEngineer
4、ingSeience,WuhanUniversity,Wuhan43(f/2,Hubei,China;3.CollegeofWaterResourcesandHy&~oelectricEngineering,Xi’anUniversityofTechnology,Xi’an71(I)48,Shanxi,China)Abstract:Inordertoclarifytheinfluenceofflood—sedimentprocessonthechannelmorphologyinwanderingreachoftheLowerYelowRiver,thescouring—s
5、iltingcharacteristicsunderdiferentflood—sedimentprocesseshavebeeninquiredbythemethodsof2一Dwater—sedimentnumericalsimulationandmeasureddataanalysis.Itisshownthatdiferentflood—sedimentpmcesseshavesignificantlydiferentefectsonshapingthemainchannel,andthechannelmoldedbythebigfloodpeakcanhardly
6、maintaintheoriginalintensityofthesedimenttransportationduringnon—peakfloodperiods.Thecumulativescouringefectsofthemainchannelhavegodresponsetotheflood—sedimentprocess,andtheflodprocessCanrealizethebesteficiencyofthesedimenttransportbyformingthemostappropriatecross—sectionmorphologyofthecha
7、nne1.Amongvariousmagnitudesoftheoverbaakflodprocesses,onlytheprocess(Q=6000m3/s)Canobtainthebestcumulativescouringeficiencybyshapingthepropercross—sectionmorphology.Therefore,thecorrespondingdischargecanbeconsideredasaregulationindicatoroftheoverbmakflodsinthe
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