复杂地形天然河道水流运动数值模拟研究

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1、AbstractNaturalriverwatersurfaceline，respectivelyinsteadyandunsteadyflowanalysisoftwoaspects．ApplicationoftheBernoulliequationandtheSaint-Venantequationscalculatingtheriversurfacecurve．However,naturalrivershavechangefulboundaryconditionsandflowstate，thereisaconversionofflowandflowcomp

2、lex．CalculatedbytheBernoulliequationofsteadywatersurfaceline，analysisintheflow,jet，flowpaRemconversionandthepierbackwaterconditionofwatersurfacecurve．Becauseoftheirdifferentflowcharacteristics，inthenumericaliterationmethodalsohasthedifference．Unsteadyflowconditions，flowpaRemisoftenuse

3、dtoslowPulaishimanimplicitscheme，directdiffusionformatandcharacteristiclinemethodoftheCourantformat．Theresultsofthesethreekindsofformats，andthecalculationofthreekindsofdifferenceschemesofwaterbalancebythelawofconservationofmass，theCourantformatinthesubcriticalflowconditionsthantheothe

4、rtwokindsofdifferenceschemesatisfiesthelawofconservationofmass．TheflowpatterniStherapidsinthreedifferenceschemesforimprovement，derivedjetCourantformat，jetdiffusionformatandjetPulaishimanformatintheory．111eriverinthenumericalcalculationforsteadyflow,peakflowwatersurface．simplecalculati

5、onmethod．Withthechangesofthenaturalriverflow,calculationofwatersurfacecurveRiverunsteadyflownumerical．comparedwitllthepeakflowandaconstantstreamofthewaterline，mostofthewatersurfacelinehigher．Finally,usingVisualBasicvisualprogramminglanguage，visualcalculationfromthewaterlineanditschang

6、einthefiver．Keyword：naturalrivercoursesteadyflowsubcriticalflowjetflowunsteadyflowdifferenceschemelI目录目录摘要⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯IAbstract⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．．IIl绪论⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯l1．1研究意义⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯11．2国内外研究概况⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯

7、21．3存在问题⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．⋯⋯⋯．．41．4本文拟采取的研究方法和思路⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯52天然河道恒定流水面曲线计算方法研究⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．72．1不同流态情况下计算方法⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯72．1．1缓流河道计算⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯。82．1．2急流河道计算⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯122．1．3动能修正系数和局部阻力系数⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯132．2流态转换情况下计算方法⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯l62．

8、3含建筑物