压缩河道的冲刷计算

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1、北京交通大学硕士学位论文压缩河道的冲刷计算姓名：高玉荣申请学位级别：硕士专业：防灾减灾及防护工程指导教师：齐梅兰20061201ABSTRACTABSTRACT：Firstly,thepresentpaperhasestablishedone-dimensionalsteadilysaturatedflow-sedimentnumericalmodelforcontractedchannel．Secondly,thediscretedifferentialequationshavebeenderived

2、byafinite-differencemethod．Thirdly,thepaperhasappliedWSPROsoftwareandtheformulas64-1and64-2ofgeneralscourofchinatocalculatethegeneralScolffofcontractedchannel．Accordingtotheseresults，thepaperhasanalyzedthereasonofproducingthedifferenceamongthem．n圮reasoni

3、sthatfirstly,inthegradeofthedifferentfluxtheresultthatcalculatedbyone—dimensionalsteadilysaturatedflow·sedimentnumericalmodelisrelevanttothehistoryandtimeofscour．Inthecontrary,thesoftwareandtheformulashavenorelationshipwitllthetimeandthehistory．Secondly,

4、inthefacetofselectingthemodel．theformula64-2hasthedifferencewitllone—dimensionalsteadilysaturatedflow-sedimentnumericalmodel．One·dimensionalsteadilysaturatedflow-sedimentnumericalmodelhastheprogresschangedgraduallyduringchannelgeRingtoshrinkwhichamplifie

5、sthelengthofthechangingdistrictintheriver．Buttheshrinkofchannelisasuddenprogressinthemodelofformula64—2andthepartofsectioncontractedisrathershoa．Sotheapplicationofone—dimensionalsteadilysaturatedflow-sedimentnumericalmodelmakestherateofvelocityless，andth

6、enthevalueofSCOurbecomesless．Moreover,one-dimensionalsteadilysaturatedflow-sedimentnumericalmodelinvolveseffectsofsedimentationvelocityandgranulediameterofsediment．WSPROsoftwareonlyadoptsthemediumparticlesizeofthegradeofsediment．111eformula64·2considerst

7、hesedimenteffectbyarelativemotionparameterofflowandsediment．Theformula64·lrelatestOtheaverageparticleofsedimentandtheformulaisnotharmonious．Sowhentheparticleofsedimentismuchlarger，theformulaCallmaketheresultless．KEYWORDS：one-dimensionalsteadilysaturatedf

8、low-sedimentmathematicmodel；contractedchannel；generalscour；WSPROsoftware．CLASSNo：TVl4致谢本论文的工作是在我的导师齐梅兰教授的悉心指导下完成的，齐梅兰教授严谨的治学态度和科学的工作方法给了我极大的帮助和影响。在此衷心感谢三年来齐梅兰老师对我的关心和指导。齐梅兰教授悉心指导我们完成了实验室的科研工作，在学习上和生活上都给予了我很大的关心和帮助，在此向齐梅兰老师