野外風(fēng)沙躍移運(yùn)動(dòng)的觀測(cè)實(shí)驗(yàn)與數(shù)值模擬.pdf

1、蘭州大學(xué)博士學(xué)位論文野外風(fēng)沙躍移運(yùn)動(dòng)的觀測(cè)實(shí)驗(yàn)與數(shù)值模擬姓名：史鋒申請(qǐng)學(xué)位級(jí)別：博士專業(yè)：力學(xué)固體力學(xué)指導(dǎo)教師：黃寧20100501蘭州大學(xué)博士學(xué)位論文野外風(fēng)沙躍移運(yùn)動(dòng)的觀測(cè)實(shí)驗(yàn)與數(shù)值模擬ABSTRACTStudiesoferosionsaltationarecurrentlyconcentratingonwindtunnelexperiments，theoreticalanalysesandnumericalsimulationsun

2、deridealaswell硒controllableconditions，suchasundertimeinvariantwindspeedandflatsandbedWhereaStheresearchesofeffectsoffluctuationscharacteristicsofwindvelocityandthecomplexmicrotopographyinrealdesertonsandsaltationappearto

3、bemuchfeweralthoughthesetopicshaveobtainedincreasingrecognitionofimportanceinrecentdecadesThisdissertationpresentssomebasicfieldexperimentsandtheoreticalmodelingandcomputationalsimulmionforerosionsaltation，andthemainachi

4、evementsaremadeinthefollowingaspects：1BasedoncooperationwithWindErosionandWaterconservationResearchUnitofUSAgricultureDepartment，weinstalledanddebuggedasystemwithaformerstationmasterofBigSpringFieldStation，asoilscientist

5、，Donald(Bill)FryrearwhichWasdesignedtosynchronouslymeasurephysicalquantities，such嬲fluctuatingnearsurfacewindvelocitysandtransportintensitytemperatureandhumiditywith1HzfrequencyattwopointsonthebarchanduneinMinqinarea，whic

6、hislocatedbetweenedgesoftheBadainJaranDesertandtheTenggerDesert2ThemeasuredwindspeedandsaltationintensityareusedtocalculatethresholdwindspeedinlocalenvironmentalconditionsTheresultsshowthatthethresholdwindspeedvariesinco

7、mplexways，asaresultofthevariationoflocalenvironmentalconditionsduringtheduststormThroughanalyzingobservationaldataitisfoundthatthecorrelationcoefficientbetweenhorizontalwindvelocityandsandsaltationintensitylogarithmicall

8、yincreaSeswiththeincrementoftimestepwhenitislessthan40secondsandthenitgraduallytendstostable3Usinganumericalmodelofsandsaltation，weanalyzedthefieldsandfluxesunderthefluctuatingwindspeed，andthenumericalresultsarefairlycoi