24728.最大廣義流原理與河道泥沙輸運(yùn)

1、獨(dú)創(chuàng)性聲明本人聲明所呈交的論文是我個(gè)人在導(dǎo)師指導(dǎo)下進(jìn)行的研究工作及取得的研究成果。盡我所知，除了文中特別加以標(biāo)注和致謝的地方外，論文中不包含其他人已經(jīng)發(fā)表或撰寫(xiě)過(guò)的研究成果，也不包含為獲得寧夏大學(xué)或其它教育機(jī)構(gòu)的學(xué)位或證書(shū)而使用過(guò)的材料。與我一同工作的同志對(duì)本研究所做的任何貢獻(xiàn)均已在論文中作了明確的說(shuō)明并表示了謝意。研究生簽名：時(shí)間：矽／≯年6月日關(guān)于論文使用授權(quán)的說(shuō)明本人完全了解寧夏大學(xué)有關(guān)保留、使用學(xué)位論文的規(guī)定，即：學(xué)校有權(quán)保留送

2、交論文的復(fù)印件和磁盤(pán)，允許論文被查閱和借閱，可以采用影印、縮印或掃描等復(fù)制手段保存、匯編學(xué)位論文。同意寧夏大學(xué)可以用不同方式在不同媒體上發(fā)表、傳播學(xué)位論文的全部或部分內(nèi)容。(保密的學(xué)位論文在解密后應(yīng)遵守此協(xié)議)研究生簽名：導(dǎo)師簽名：易他鄉(xiāng)習(xí)時(shí)問(wèn)：沙／≥年6月歲日時(shí)問(wèn)：勱7砂年舌月歲日AbstractA眥‘networkisomplexopensystemRivernetwork’scompleXnymainlyfallsoniIscom

3、pleteopenness，thesysteminputrandomness，andcomplexcoupledrelationsbetweenstreamandtheriverchannelIt8。eallydifficulttomakeacleardescriptioncotheserelationshipsTherefore，weputwater。sandanditscomplexcombinedrelationsintomaxi

4、mumgeneralizedflowwhichisintroduced1nthisthesisandexplorethelawofstreamsedimenttransportandtheev01utionmechanjsmsunderdlfierentwaler。sandcombinationconditionsaccordingtotheideathatopentheadaptivesvsIemeVoJullonlomakethem

5、aximumgeneralizedflowInrivernetworksystems，wacerflowandsedimentconcentratlonare咐omainfactorsthatreflectbothinputsandthecorrelationsbeMeeninputsand帆rcnanneJIhlspaperaItemptstousetheprincipleofthemaximumgeneralizedflowinor

6、dertoexDIoretherelationsbetweenwatersandcombinationandrivertypeconversl。onThemainpartsoftheworkareasfoilows：上JJntroduclngtheresearchmethodsandresultsofthepreviousresearchers，sketchingthemaxlmumgeneralizednowprinciple，and

7、givingtheuniversalmaximumgeneralizedflowprincipleequationsofcomplexopensystemz)JnIroduclngIhegeneralizedflowintiverchannelsedimenttransportationandtherivertypeeVoJutlonprocesswhichiscausedbythechangeoferosiondepositUnder

8、theconstraintconditionsofwatersandrelationstheauthorappliesLagrangemultipliermethodtoobtainthemaximumgeneralizedtJowanddrawaconclusionthatriverchannelreachesthestateofmaximumgeneralizedflowbvseJ士一adapIallon，whichmeansthe

9、rivertypeturnsouttobetheoptimumchoiceofwater，sandandrivercnannelInthisoptimumstate，theauthorinvestigatestherelationsbetweensedimenI。carrvjngcapabilitycharacterizedbysediment。carryingcoefficientandsedimentconcentrationThe

10、resu】tindicatesthattherelationsofsediment。carryingcoefficientandflowobeythepowerrelations，andIhere1sacompJexrelatlonbetweensediment—carryingcoefficientandsedimentconcentrationthatwiththeincreaseof8edlmentconcentrationsed

11、iment。carryingcoefficientdecreasesfirstandthenincreasesthisrelationISco盯espondingtothesediment—carryingmechanismoftheLowSedimentConcentrationFIowandHYPerConcentratedFlowsSotheauthorcanexplainthedoublethresholdsphenomenon

12、onthetransitionbetweenerosionandsedimentationInLowSedimentConcentrationF10w，theincreaseofsed蛐entconcentrationmakestheturbulentstateofflowinhibited，anddecreasesthesedimentcarrVingcapabilityinthiscase，theriverchannelchange

13、sfromerosiontosedimentationaroundasedimentconcentrationthresholdWiththegraduallyincreasingofsedimentconcentration，theturbulenCstaleofflowisfurtherrestrained，meanwhile，thestreamtulTlstobemuddywaterwithhighsuspendedsedimen

14、tandthefloatagebecomesthedominantfactortothesedimentcarryingcapabilityWiththesedimentconcentrationincreasesthefloatageandthesediment—carryingcapabilitybecomestrongerThus，theriverchannelchangesagainfromsedimentationtoeros