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          • 簡介:太原理工大學碩士學位論文基于SILVERLIGHT技術的水庫管理WEBGIS研究姓名唐東軍申請學位級別碩士專業水文學及水資源指導教師楊軍耀20100401太原理工大學碩士研究生學位論文IISILVERLIGHT是RIAWEB的主流技術,是形成WEBGIS新的發展方向。論文應用基于SILVERLIGHT技術的WEBGIS模型,以漳澤水庫為案例,開發了水庫管理信息系統,為水利行業的WEBGIS新技術應用做了一點研究和嘗試。關鍵詞水庫管理,WEBGIS,SILVERLIGHT
            下載積分: 4 賞金
            上傳時間:2022-07-27
            頁數: 58
            12人已閱讀
            ( 4 星級)
          • 簡介:太原理工大學碩士學位論文汾河河道工程管理信息系統的創建與研究姓名向紅梅申請學位級別碩士專業農業水土工程指導教師樊貴盛20100501太原理工大學碩士研究生學位論文III的查詢,修改,管理等功能。②汾河河道工程數據庫的管理。該模塊根據不同用戶的不同需求實現了對汾河河道工程的數據庫的管理和更新,數據信息的存儲和備份,信息的檢索和查詢,地理空間分析和三維分析,數據統計和專圖的制作顯示輸出和圖形打印。為河道管理部門的決策提供科學、可靠的依據。③系統利用地理信息系統開發平臺內置的VBA語言,研制和開發了汾河河道工程管理的二次平臺,實現了汾河河道工程管理的雙向查詢、地圖操作、信息查詢、信息管理和圖形交互顯示等。該系統操作簡單、界面友好、使用方便、運行速度快。遵循實用性、可靠性、科學性、規范化、可擴展性等設計原則,采用地理信息系統開發平臺內置的VBA語言,實現了汾河河道工程的動態管理,大大提高了管理效率。本論文的創新點⑴系統設計與開發面向河道工程管理業務類型的要求,體現了信息化與專業化的結合。⑵實現了分級用戶分級功能管理。針對河道的管理現狀,提出了河道數字信息的多級用戶管理模式,實現全流域范圍內的分級用戶分級管理。⑶二次管理開發。系統實現了屬性數據與GIS數據的管理、查詢及動態更新一體化。本文首次構建了汾河流域骨干河道的地理信息管理系統,但由于基礎信息積累、資料收集等方面的不足,致使該系統還需在今后的應用過程中不斷予以充實和補充,此外,其二次開發的深度和廣度尚需提高和深入。關鍵字ARCGIS汾河河道工程管理VBA屬性數據庫
            下載積分: 4 賞金
            上傳時間:2022-07-26
            頁數: 97
            13人已閱讀
            ( 4 星級)
          • 簡介:海岸、河口區與人類經濟、生活等各個方面息息相關,對人類有著非常重要的作用。海岸、河口區是陸海交界地帶,陸地海洋相互作用顯著,因此存在著很多的問題,其中對工程界來講非常重要的一個問題就是泥沙問題,泥沙所引起的岸灘演變、港口航道的淤積、水動力環境的改變等等。針對海岸工程中泥沙問題的普遍性、復雜性,本文作者基于水動力生態耦合模式COHERENS發展了一套三維水動力懸浮泥沙耦合模型COHERENSSED,并且考慮到海岸、河口區波流相互作用比較顯著,本文將水動力懸浮泥沙耦合模式COHERENSSED與物理上先進的第三代波浪模式SWAN聯合,最終發展了波流聯合作用下的三維水動力懸浮泥沙耦合數學模型并將其成功的應用于黃河三角洲濱海區的潮流和懸浮泥沙輸運規律的研究。由于研究區域黃河三角洲濱海區有著較高懸沙濃度的存在,本文引入了懸浮泥沙對湍流的衰減作用以及近底層湍流產生、耗散及浮力破壞的平衡假說,并根據該平衡假說推導出了單方程KΕ湍流封閉模式近底層內的湍流能量平衡表達式。對于波浪對水流的影響,本文在水動力模型中引入波浪依賴的表面風應力的影響、波浪影響下的底部剪切應力以及波浪產生的輻射應力影響并針對這些影響進行了數值分析。根據底床沉積物特性沿垂直方向變化以及水平方向變化的特點,開發了能夠處理分層、分區域底床處理模型,從而能夠較好地反映現場底床沉積物實際分布情況。本文的主要工作及創新點體現在一、在水動力模塊,本文對COHERENS作了如下發展與完善①底床面處的波流相互作用引入了波浪傳播方向與流方向之間夾角的影響,而原模式中則認為這兩個物理過程的方向是一致的,這一點與實際有時存在差異;②湍流模式的湍流能量方程中考慮了懸浮泥沙對湍流的衰減作用;③近底處放棄了湍流耗散與產生平衡的假設,而采用湍流耗散、產生及浮力破壞作用相平衡假說,從而改變了近底層湍流變量的邊界條件并推導得出了單方程KΕ模式的湍流能量底層邊界條件;④引入了波浪破碎引起的表面混合長度用以計算受波浪影響下的湍流的混合長度;⑤引入了波浪依賴的表面風應力;⑥將波浪輻射應力引入水動力模型并應用于黃河三角洲三維懸浮泥沙輸運數值模擬研究中;二、將COHERENS與第三代波浪預報模式SWAN相結合,考慮了水位場、流速場對波浪的頻移以及折射等影響;三、建立發展了一套波流聯合作用下的三維懸浮泥沙模型,并將經發展后的水動力模塊COHERENS與作者發展的懸浮泥沙模型相結合得到了本文數學模型的核心即水動力泥沙耦合模型COHERENSSED;四、在前人基礎之上進一步發現了黃河三角洲濱海的切變鋒具有三維結構存在,其表層與底層由于潮相的不一致以及徑流的影響而致使表層與底層切變鋒在位相、歷時與強弱都有明顯的不同;
            下載積分: 4 賞金
            上傳時間:2022-07-26
            10人已閱讀
            ( 4 星級)
          • 簡介:西安理工大學碩士學位論文洛惠渠灌區地下水鹽動態變化規律研究姓名張霞申請學位級別碩士專業水文學及水資源指導教師李占斌李鵬20070301西安理工大學碩士學位論文TITLESTUDYONRULESOFGROUNDⅥ陰ITERANDSAL丁DYNAMICCHANGEINLUOHUICANALIRRLGATL0NDISTRICTMAJORHYDROLOGYWATERRESOURCESNAMEXIAZHANGSUPERVISORPROFZHANBINLISIGNATURESIGNATUREASSODATEPROFPENGUSIGNATURE厶旦呼ABSTRACTWITHTHERAPIDDEVELOPMENTOFIRRIGATIONAGRICULTUREINCHINA,THEIRRIGATIONAREAHASBEENINCREASINGCONTINUOUSLYHOWEVERTHEUNREASONABLEEXPLOITATIONANDUTILIZATIONMODEANDINSUFFICIENTMANAGEMENTPATTERNOFWATERRESOURCESINIRRIGATIONDISTRICTSHAVERESULTEDINMANYSERIOUSLOCALCCOENVIRONMENTALPROBLEMSSUCHASSOILSECONDARYSALINIZATIONANDALKALIZATION,LANDDESERTIFICATIONANDGROUNDWATERQUALITYDETERIORATIONACCORDINGTOTHESERIOUSPROBLEMOFSOILSECONDARYSALINIZATIONANDALKALIZATIONREAPPEAREDINLUOHUICANALIRRIGATIONDISTRICTINTHEPASTSEVERALYEARS,BYUSINGTHEINTEGRATEDMETHODSSUCHASFIELDOBSERVATIONWELLONSITEOBSERVATION,FIELDINVESTIGATIONANDINDOOREXPERIMENTALANALYSISONWATERSAMPLESANDSOILSAMPLESANDSOON,THEGROUNDWATERWATERCHEMICALPROPERTIESANDGROUNDWATERSALTHETEROGENEITYASWELLASTHEEFFECTOFGROUNDWATERTABLEONGROUNDWATERWATERCHEMICALPROPERTIESWEREANALYZEDDETAILEDLYINTHEPAPERINADDITION,THEGROUNDWATERTABLEANDGROUNDWATERWATERQUALITYANDSOILPROPERTIESINLUOHUIIRRIGATIONDISTRICTINTHECOMINGFIFTEENYEARSWEREALSOPREDICTEDINTHEPAPERTHEOBTAINEDRESULTSINTHEPAPERAREOFGREATIMPORTANCETOGROUNDWATERDYNAMICREGULATIONANDCONTROL,RATIONALGROUNDWATERWATERRESOURCESUTILIZATION,ETCTHEMAINSTUDYCONTENTSANDCONCLUSIONSAREASFOLLOWSFIRSTLYTHEEXITINGSITUATIONANDREASONSOFTHESOILSECONDARYSALINIZATIONTHERESULTSSHOWEDTHATTHESOILSALTCONTENTISHIGHINTHENORTHOYEAWHILELOWINTHESOUTHAREAOFTHEIRRIGATIONAREA,ANDTHESOILSALTCONTENTISHIGHINTHEMIDDLEAREAWHILEITISREDUCEDGRADUNLYTOWARDSTHEBOTHEDGESOFTHEIRRIGATIONAREAASARESULT,THESOILSALTCONTENTPRESENTSAFANSHAPEDSPATIALDISTRIBUTIONCHARACTERISTICSINTHEIRRIGATIONAREAHOWEVEGCOMPAREDWITHTHESOILSALTCONTENT,THESOILALKALIDEGREEPRESENTSAIRREGULARSPATIALDISTRIBUTIONCHARACTERISTICSINTHEIRRIGATIONAREAINADDITION,THESOILSALTINTHEIRRIGATIONDISTRICTISMAINLYCOMPOSEDOF
            下載積分: 4 賞金
            上傳時間:2022-07-26
            頁數: 59
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          • 簡介:河海大學碩士學位論文基于GIS的水環境信息管理系統研發以上海浦東地區為例姓名左一鳴申請學位級別碩士專業水文學及水資源指導教師丁賢榮20040601一翌蘭查蘭翌主笙苧ABSTRACTBASEDONTHERESEARCHOFWATERENVIRONMENTINFORMATIONIUPUDONGINTHISPAPERIDEVELOPPUDONGHYDROLOGYMANAGEINFORMATIONSYSTEMBASEDONGISONTHEBASISOFWHAT’SUSERDEMANDS,THESYSTEMADOPTPREDETERMINATIONLONGITUDE1ATITUDEDESIGNMETHODTHESYSTEMDEPARTINTOMODELSTHEMODULESENCAPSULATED11BYDELPHIANDCOMMUNICATEBYINTERFACEOFPREDEFINITIONTHESYSTEMADOPTCLIENT/SERVERSTRUCTURETHESYSTEMPROGRAMBYMAP/NF07,MAPX5,DELPHI7,ASPANDSQLSERVER2000THESYSTEMINCLUDEDATETRANSFERMODULE,WATERENVIRONMENTEVALUATIONMODELGISMANIPULATE,WATERENVIRONMENTREPORTEDITMODELANDONEDIMENSIONNUMERICALSIMULATINGHYDRAULICSANDWATERQUNITYFEATURESOFRIVERMODELPARTICULARASFOLLOW1WATERENVIRONMENTEVALUATIONMODELCANCOMPUTEREGIONBYUSERDEFINITIONANDHASNORESTRICTOFDATABASESTRUCTUREITCANBEADAPTTODIFFERENTDEPARTMENT’SDEMANDBYSIMPLESETTING2THESYSTEMCANAUTOCOMETOBEINGWATERENVIRONMENTREPORTINTHEFORMOFHTML3ACCORDINGTONUMERICAIMATHEMATICSANDENVIRONMENTALHYDROMECHANICS,ONEDIMENSIONNUMERICALSIMULATINGMODELSISESTABLISHEDINTHEMODULE,WHICHCANBEUSEDTOFORECASTHYDRAULIESANDWATERQUALITYFEATURESOFRIVERNETWORKSTHESYSTEM’SCHARACTERISTICASFOLLOWS1THESYSTEMSTRUCTUREINCARNATESSPECIALITYOFHYDROLOGY2THESYSTEMCANBEHAVEATTRIBUTEDATEANDGISDATEANDPROVIDESIMULATINGMETHODOFHYDROLOGICANDWATERQUALITYFORFIVERNETWORKS3THESYSTEMINTERFACEISFRIENDLYANDTHESYSTEMMENUANDPOPMENUCANBEDESIGNEDBYUSELKEYWORDSGIS,RIVERNETWORK,LONGITUDELATITUDEDESIGNMETHOD,RIVERNETWORKSWATERENVIRONMENT,WATERQUANTITYANDQUALITYMODEL
            下載積分: 4 賞金
            上傳時間:2022-07-27
            頁數: 71
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          • 簡介:河海大學碩士學位論文瀑布溝水電站庫區景觀變化與優化研究姓名梁炎申請學位級別碩士專業景觀生態學指導教師袁旭音盧紅偉20080601ABSN_ACTABSTRACTINRECENTYE2URS,、VEBUILDASERIESOFLA唱ESCDEWATERRESERVOIRIILSOUTLLWESTWARDOFOURCO咖MERESEN,OIRSUBMERGEAREA謝LLCAUSEASERIESOFNEGATIVEIINPACTSUCHASWATERPOLLUTION,BEDLOADFILLLUP,WATER鋤DSOILLO甌ENVIROMENTALWORSEN鋤DGEOLOGICALDISASTERAT血ES鋤ETIME,咖INULLDATEC趾CHAILGET11EL卸DSC印EPANENL,鋤D塒1LII訌LUENCETHEQUAL時OFMEⅥ,HOLELANDSCAPEINMISTHESIS,WECHOOSEPUBUGOUHYDROPOWERSTATIONOFDADU斑VERFORANEX卸1PLE,TOSTANTHERESEA托HOFL鋤DSCAPECHANGINGA11DL鋤DSC印EOPTIMI刎ONSINRESENROIRSDBME瑪EARE亂ARTICLESTARTSF如MSNJDYTHEPRESEMRESEARCHSTAMSOFBOTLLHEREAILDABROAD,NLEN鋤ALYSESSPECIFICCHARACTEROFRESERVOIRSUBME唱EAREAW11ICHCAUSEDBYPUBUGOUHYDROPOWERSTATIONT酞EL鋤DSCAPEECOLOGYⅡLEOD,F研SUPERVISE,鋤ALYZEDT11ECHARACTERISTICSOFLANDSCAPEPATTEMOFTLLEPROJECTAREABYUSINGLALLDSC印EPANEMINDEXTHENTHEPAPERRESEARCHEDTLLECHAILGEOFLANDSCAPEP叭EMANDIT’SA虢CTIONOFMERESEN,OIRSUBME唱E盯EA缸MTLLECHANGEOFLALLDSCAPECHARACTERISTICS,LAILDSCAPEDIVERSIT,卸DLAILDSC印EPREDOMINANCEDEGREEBYCOMBINETLLECHARACTERISTICOFPUBUGOUHYDROPOWERSTATIONA11DGENERAJSI似IONOFRESEARCHAREAFORCONSIDERATIONNENUMBER,SIZE,ARE碼LOCATIONOFTHEMAINPATCHWILLHAVEBIGCHANGES111ELANDSCAPEUILIFO肌ITYINDEXINCRE2LSEDBY784%TO793%;THEPREDOMINANCEINDEXOFWATERSAREAPATCHHASBEENGREATLYIMPROVED,FROM36%TB174%,T11EBIGGESTPREDOMINANCEADV鋤TAGEISSTILLTHEF抽LANDECOSYSTEM;LANDSCAPE行AGMENTATIONWILLALSOBEBINCREASED,ESPECIALLYTHECO而DORDENSIT,FROMTLLEORIGIN砌361%PERCENTINCREALSEDTO2734%,STREN舀HENINGTHEROLEOFTHEBARRIERFORTHE1ANDSC印ECHANGESSTUDYOFRESEARCHAREA,WEDETE咖INANTTHEUNIQUEHYDROLOGYCONDITIONOFRESERVOIRASTHEMAJORDISTURBANCEGENEIILLAILDSCAPECHANGING,THENUSETHEL觚DSCAPECHANGESANDSTABILIT,THEORYASAGUIDETOSTANRESEARCHONTHESTABILITYOFDI療BRENTLANDSC印EELEMENTSANDTHERELATIONSHIPOFINTERFERENCEANDSTABILITYOFTHELANDSCAPECHANGESTHELANDSCAPESTABILITYTHEREWILLHAVEAPROCESSFIROMINSTABILITYTOENHANCINGIT’SSTABILITYATTHESAMETIMEWETRYTOBUILTAEVALUATEMODELTOEVALUATETHEINTEGRATION
            下載積分: 4 賞金
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            頁數: 61
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            15人已閱讀
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          • 簡介:碩鄭州士學授予單位代碼學密10459號Q2Q23皇級大學位論文論文題目基于GIS的流域水資源作者姓名學科門類專業方向導師姓名、職稱數量評價方法及應用研究李建峰工科查歪堅電工程水文學及水資源左其亭教授2005年05月10日鄭州大學碩士學位論文摘要ABSTRACTWATERRESOURCESISTHEMATERIALBASESOFHUMANBEINGS’SURVIVALANDSOCIALANDECONOMICDEVELOPMENTITISIMPORTANTNATURALRESOURCETHATCARLNOTBEREPLACED、MTLLTHEQUICKDEVELOPMENTOFECONOMICANDSOCIALANDURBANIZATIONPROCESSTHEDEMANDSFORTHEWATERRESOURCESOFPEOPLEAREHIGHERANDHIGHER,BUTFLESHWATERRESOURCESTHATCALLBEUTILIZEDARELIMITEDTHEDEFICIENTOFWATERRESOURCESHASNOTONLYRESTRAINTHEDEVELOPMENTECONOMICANDSOCIAL,HASBUTA1SOCAUSEDTHECONSTANTDETERIORATIONOFWATERENVIRONMENT。ITISTHEPREREQUISITEANDFOUNDATIONOFCARRYINGONDEVELOPMENT、UTILIZATION、PLAN、MANAGEMENTOFWATERRESOURCESTOFAMILIARWITHTHEWATERRESOURCEAMOUNTANDDISTRIBUTIONOFSPACETIMESOSTUDYINGWITHTHEIMPORTANCEOFQUANTITYOFREGIONALWATERRESOURCEHASNOTONLYTHEORETICALBUTALSEALISTICMEANINGTHISTEXTTHATSUMMARIZESANDANALYSESTHECURRENTSTUDYINGSITUATIONSBOTHATHOMEANDABROADOFTHEEVALUATIONOFWATERRESOURCESPOINTSOUTTHEDEFICIENCYOFTHEEVALUATIONOFWATERRESOURCEATPRESENTONANALYSINGTHECONSTITUTESANDCHARACTERSOFWATERRESOURCESSYSTEMITSETSUPTHEEVALUATIONMODELSOFQUANTITYOFWATERRESOURCEINBASINFINALL3’REGARDINGASTARIMBASINASTHERESEARCHOBJECTTHECONCRETECONTENTISASFOLLOWS。NONCONSULTINGTHEDOMESTICANDFOREIGNDOCUMENTSABOUTWATERRESOURCESITSUMMARIZESTHECURRENTSITUATIONINWATERRESOURCEEVALUATIONBOTHATHOMEANDABROADCOMBINII“1OTHECHARACTERSANDADVANTAGEOFGISUTILIZINGGISASTHEMEANSOFWATERRESOURCESEVALUATIONWILLBETHEDEVELOPMENTTRENDIN血EFUTUREF21ITEXPLAINSBASICTHINKSOFTHEQUANTITYEVALUATIONOFWATERRESOURCESINDETAIL,ANDEXPOUNDSTHEFACTTHATPRINCIPLES、CONTENTS、BASICTHEORIESANDMETHODSTHATAREUTILIZEDINEVALUATING;ITPROBESINTOPRECIPITATION、EVAPORATIONCAPACITY、SURFACEWATERRESOURCESAMOUNT、GROUNDWATERRESOURCESAMOUNTANDWATERRESOURCESTOTALAMOUNTTHATINCLUDECOMPUTINGTECHNOLOGIESANDSUMSUPTHEIREVALUATINGMETHODSESPECIALLY3BYUTILIZINGGIS,ITNARRATESTHEBASICMETHODTOCALCULATETHEPRECIPITATIONOFBASININDETAIL,EXPLAINSTHEEVALUATINGSYSTEMOFQUANTITYOFWATERRESOURCESDESIGNANDDEVELOPMENTCOURSEONTHEBASISOFGISF41CHOOSINGTHETARIMBASINRIVERASTHERESEARCHOBJECTOFTHEQUANTITYOFWATERRESOURCEBVGIS,ANDUTILIZINGTHEMODELSOFABOVEMENTIONEDQUANTITYOFWATERRESOURCESETUP,ITCALCULATESPRECIPITATION、EVAPORATIONCAPACITY、SURFACEWATERRESOURCESAMOUNT、GROUNDWATERRESOURCESAMOUNT、WATERRESOURCESTOTALAMOUNTINEVALUATINGTHEQUANTITYOFWATERRESOURCESOFTHETARIMBASIN,ANDANALYSESTHERESULTOFCALCULATIONPROVED,BYVERIFYINGTHERESULTTHATACCORDSWITHTHEACTUALCONDITIONSOFQUANTITYOFWATERRESOURCESINTARIMISRATIONAL、RELIABLE5BYUTILIZINGVISUALBASIC60ASTHESYSTEMATICDEVELOPINGINSTRUMENTMAKETHEEVALUATIONSOFTWAREOFINQUANTITYOFWATERRESOURCESINT缸IMBASINRIVERONTHEBASISOFGISTHEINTERFACEISFRIENDLY;ANDITISCONVENIENTINOPERATINGTHESYSTEMKEYWORDSWATERRESOURCES;WATERRESOURCESEVALUATION;G1S;EVALUATINGMODELS;TARIMBASINRIVER
            下載積分: 4 賞金
            上傳時間:2022-07-28
            頁數: 74
            9人已閱讀
            ( 4 星級)
          • 簡介:9017‘2西南碩士學M位代“Q』蛭巫一學廿』墊業鯉蟲學位論文基于G1S的白鶴灘水電站庫區太寨溝、海子溝流域地質災害危險性評價研究論文作者曲乍指導救師況明生教授學科業自然地理學Q咒向地貌與閂境F二息樂統提交論殳口期2006年4月論女答辯LL刺2006年5月學位授R竹位兩南大學IQ畦戊2D0FI年5川摘要采取科學的治理措施和監測預報,進行合理的地質災害防治,以便工程得以順利進行。實踐證明,基于GIS的地質災害危險性評價與傳統的基于紙質地圖的地質災害危險性評價相比,更加快速、高效,完全可以取代傳統的危險性評價方法,特別是合適的評價模型的建立,大大提高了地質災害危險性評價的科學性、準確性,使地質災害危險性評價向模型化、定量化和現代化的目標又邁進了一大步。關鍵詞大寨溝、海子溝流域地質災害GIS危險I生評價II
            下載積分: 4 賞金
            上傳時間:2022-07-26
            頁數: 60
            8人已閱讀
            ( 4 星級)
          • 簡介:華東師范大學碩士學位論文長江口北港河勢演變分析姓名武小勇申請學位級別碩士專業自然地理學指導教師茅志昌20050501ABSTRACTTHEREARETHREEORDERBIFURCATIONSANDFOUROUTLETSINTOTHESEAINTHECHANGJIANGESTUARY,ANDTHENORTHCHANNELISTHENORTHERNONEOFTHESECONDORDERHIFURATIONS,ITISOREOFTHEMAINCHANNELSINTOTHESEABECAUSETHENORTHCHANNELISNOLTHEMAINCHANNELINTOSEAFORTHEBIGSHIPPING,THEREISA】ITTLESTUDYFORTHENORTHCHANNELINTHEPAST20YEARSSEVERALBATHYMETRICMAPSOFTHENORTHCHANNELSINCETHE1970SWEREDIGITIZEDANDDIGITALELEVATIONMODELSOFTHEVARIOUSYEARSWEREBUIITWITHTHEMETHODOFKRIGINGTHENANALYSISFORTHECBANGESOFTHECROSSSECTIONS,CONTOURS,THALWEGSANDVOLUMESOFRIVERCHANNELWEREMADEACCORDINGTOTHEDEM0NTHEHASISOFTHEFORMERRESEARCHTHEPROCESSOFTHENORTHCHANNEIMORPH0109YWASILLUSTRATEDANDTHEREASONOFTHEEVOLUTIONWASANALYZEDSUMMARILYTHEREARESEVERALCOGNITIONSAFTERANALYZING1THECHANGEOFTHEUPPERCHANNELOFTHENORTHCHANNELISCORRELATEDTOCHANGEOFTHETRANSVERSES1OPECAUSEDBYCHANGEOFTHEFLOWRESISTANCEANDTHELOOSEBOUNDARYCONDITIONS2LIUXIAOSANDRIDGEINTHEMAINCHANNELOFTHENORTHCHANNELWASFORMEDOFTHESANDSCUTFROMTHENANMENMARGINALBANKOFCHONGMINGISLANDINTHEBEGINNINGOFTHE1980S3,THEREARETHREEPERIODSINTHEPROCESSOFNORTHCHANNELSINCETHE1970S1THEPERIODOFINSTABILITY197219852THEPERIODOFREADJUSTMENT19851996H3THEPERIODOFRELATIVESTABILITY1996NOW4ASANDRIDGEWASFORMEDOFTHESANDSMOVEDFROMTHEUPPERRIVERCHANNELANDMOVEDOWNSTREAMCONSTANTLYINTHERECENTYEARSANDTHEDOWNSTREAMSEGMENTOFTHENORTHCHANNELCHANGEDINTOAMULTIPLESYSTEMCHANNEL5THEPROCESSOFTHEDOWNSTREAMCHANNELISRESTRICTEDBYTHEPROCESSOFTHEUPSTREAMCHANNEL,THEREISALAGGINGEFFECTINTHEPROCESSOFTHEUPSTREAMCHANNELINFECTINGTHEDOWNSTREAMCHANNEL6THEINFUENOEOFTHEFLOODISIMPORTANTTOTHEEVOLUTIONOFTHEREGIONALNORTHCHANNELTHERESULTS
            下載積分: 4 賞金
            上傳時間:2022-07-26
            頁數: 85
            9人已閱讀
            ( 4 星級)
          • 簡介:大連理工大學碩士學位論文多向不規則波波群的數值模擬研究姓名包艷申請學位級別碩士專業港口、海岸與近海工程指導教師柳淑學20060601多向不規則波波群的數值模擬研究THERESEARCHONNUMERICALSIMULATIONOFTHEMULTIDIRECTIONALWAVEGROUPSABSTRACTWAVESIMULATIONISTHESUBJECTINTLLECOASTALANDO凰HOREENGINEERINGFLELDWHICHALWAYSINTERESTEDPEOPLE,SODEEPLYRESEARCHONMISSU巧ECTHAVEBEENMADEANDMALLYNOTICEABLEACHIEVEMCNTSHAVEBEENOB協INEDRECEMYEARS,PEOPLEHAVESIII血缸EDUNIDIRECTIONALANDMLDTIDIR吼IONALIN它GMIARWAVESWI協也ETA曠GETEDWAVEP盯鋤ETERSSUCCESSFMLYIILMEWATERTA】血ANDWATERBASIN,WLLICH盯ETHEIMPORTANTMEAILSFORW“ESIMULATIONASNLEE圩BCTSOFWAVE毋01JPIILESSONTLLE枷ONBEMEENWA、,ESAND也ES捫LCTILRES,THEORIESANDTECLLLLOLO西ESON、張VEGMUPSIMULA士IONWEREGRADUALLYATTACHEDMORCIMPORTANCE,THE瑪SCHOLARSHAVEPROPOSEDLOTSOFMEMODSOFT11ESIMLLIATIONWILICHHAVEBEENIIM“EDTO謝D沁CTIONAI、俐ESINFACT,THEOCEANWAVESAREIRREG呻LARANDMLLLTIDIRECTIONALSOTHERESE盯CHONMULTIDIRECTIONALWAVE目OUPISVERY油PORTAILTⅡOTONLYMTLLEMEORYBUTALSOIILTHEP刪ICEK也ISPAPER,BASEDONTHCSTLLDYOFNUMERICALSIMULATIONOF2一D啪VEGROUPS,THL0UGHT王LEUSEOFDIRECTIONALDISTRIBUTIONNMCTIONTHEMEMODOFⅡUM甜CALSIMULATIONOFMESEAWAVE掣DUPSWITH山EGIVENSPEC咖,也E掣ⅫUPHEIGHTFHCTORGFHANDMEPAR鋤ETEROFDIFF柏LTDIRECDONWAVESISPROPOSEDS伽STICSWEREPERFB姍EDON也ES曲ULATEDRESLLLTSTEVEALTLLERELATIOILSBJPSBET、VEENWAVE目OUPILLESSANDSTATISTICALCHAR盯TERISTICSATT11ES跚EDME恤EEFFBCTOFDIFFBREMVALUESOFSOMEPARA【NETCRSON出ESIMULATIOⅡOFWAVEGROUPSISEVALUATEDANDTLLEASSOCIATEDPR叩OSALSARE西VENTHEEFFECTOFDIRECD∞ALSPREADMGONTLLEMAINPAR鋤ETERSFORDESCRIBINGWAVE鯽UPMESSISALSOMSCUSSEDINTHISP印ERBASEDON娜INESSA工LALYSISOFSIMLLLATEDSEAWAVESFORDI觸ENTDNCTIONALSPREADING,RELATIONSHIPB出№ENDIRECTIONA|SPREADINGAILDP踟鼬ERSFORDESCRIBINGWAVEGROUPINESSISSN】DIED,WHICH塒LLPROVIDESREF醯ENCET0矗LNHERSTILDYIN也IS蠡ELDINTHE‰EK呵WORDSMUMDIRECTIO聃IWAVEGROUPS;NUM嘶CALS哪UIATION
            下載積分: 4 賞金
            上傳時間:2022-07-26
            頁數: 64
            5人已閱讀
            ( 4 星級)
          • 簡介:河海大學博士學位論文區域偽衛星增強GPS精密定位方法及其在形變監測中應用姓名桑文剛申請學位級別博士專業大地測量與測量工程指導教師何秀鳳20080301ABSTRACTASALLADVANCEDSPACEGEODETICTECHNIQUE,GLOBALPOSITIONINGSYSTEMGPSHASCAUSEDAGREATREVOLUTIONINSURVEYINGANDMAPPINGWITLLTHEDEVELOPMENTOFHARDWAREANDSOFTWAREINRECENTYEARS,ITHASBEENWIDELYUSEDFORPRECISEGEODETICCON仃OL,SETTINGOUTOFENGIUEEDNGSTRUCTURESANDDEFORMATIONMONITODNGITISWELLKNOWNTHATFORSUCHSPAEEBOMESATELLITEPOSITIONINGSYSTEM,THEPOSITIONINGACCURACY,AVAILABILITYANDRELIABILITYMUCHDEPENDONTHENUMBERANDDISTRIBUTIONOFTHEVISIBLESATELLITESHOWEVERMANYSURVEYCONDITIONSSUCHASURBANCANYONS,DEEPOPENPITMINASANDVALLEYS,LIMITTHENUMBEROFVISIBLESATELLITESANDTHEREFOREDETERIORATETHEPOSITIONINGACCURACYINSOMEWORSTSITUATIONS,SUCHASUNDERGROUNDORINSIDEBUILDINGSTHEGPSSATELLITESIGNALSANCOMPLETELYLOSTMOREOVERTHEVISIBLESATELLITESMDISTRIBUTEDABOVETHEHORIZONTHEACCURACYOFGPSDERIVEDHEIGHTCOMPONENTISKNOWNTO23TIMESLOWERTHANTHEHORIZONTALONESTHEPROBLEMSABOVECANBEADDRESSEDBYADDITIONALSIGNALSTRANSMITTEDFROMGROUNDBASED“PSEUDOSATELLITES“ALSOCALLEDPSEUDOLITSPSLLPSEUDOLITSAREADDEDINTOAGPSSURVEYSYSMMTOSTRENGTHENSPACEBERNESATELLITEGEOMETRYDEVELOPMENTOFPSLWASPRIMARILYINTENDEDFORNAVIGATIONUSERS;ITSPOTENTIALAPPLICATIONINPRECISIONSURVEYSISANEWTOPICANDHASATTRACTEDATTENTIONSONLYRECENTLYMANYCHALLENGINGISSUESINCLUDINGTHEORYANDIMPLEMENTATIONNEEDTOBEDEVELOPEDTHEEMPHASISINTHEDISSERTATIONHASBEENPLACEDON“1APPLICATIONSOFPSLWERECATEGORIZEDINTODIFFERENTCLASSESFORDIFFERENTIMMEASURABLEAREASBASE011THEGPSPOLICYCONSTELLATIONANDSIGNAJSTRUCTURETHISDISSERTATIONPRESENTSLMOVERVIEWOFTHAPSLHARDWAREDEVELOPMENTS,RECANTPROGRESSINPSLPOSITIONINGAPPLICATIONSANDDISCUSSESTHECURRENTCHALLENGINGISSUES2ALOWCOSTPSLTRANSMITTERISDESIGNEDANDDEVELOPEDFORENGINEERINGINTHISDISSERTATIONTHEPSLMGENERATEACALTIERWAVEATGPSLLFREQUENCYMODULATEC/ACODEANDNAVIGATIONDATAONTOTHECARRIERTHEMAINNAVIGATIONPARAMETE%ANDTHECALCULATIONMODULEABOUTPSLWEREDEFINEDASCHEMETHATNAVIGATIONDATACONTAINTHEPOSITIONINGINFORMATIONABOUTPSLWASPROPOSEDTHEEXPERIMENTINDICATESTHATTHEPSLSIGNALCONFORMSTOTHEGPSSTANDARDICD200ANDCANBEDETECTEDANDCAPTUREDBYAGPSRECEIVER3FORDIFFERENTAPPLICATIONSOFPSEUDOLITE∞OPAMIZATIONMODELOFPSLCONSTELLATIONWASPROPOSEDINTHISDISSERTATIONAMETHODBASEDONDOPGEOMETRYSTRUCTUREISDEVELOPEDTOBUILDAPSLALONECONSTELLATIONANAPPROACHFORPSLOPTIMUMLOCATIONWITHTHEIMPROVED
            下載積分: 4 賞金
            上傳時間:2022-07-26
            頁數: 120
            4人已閱讀
            ( 4 星級)
          • 簡介:石河子大學碩士學位論文古爾班通古特沙漠融雪水文過程試驗與模擬姓名湯英申請學位級別碩士專業農業水土工程指導教師周宏飛20080601ABSTRACTGURBANTONGGNTDESERTWHICHISLOCATEDINNORTHWESTOFCHINAISTHEONLYONEDESERTTHATEXISTENCESTEADYSNOWCOVERINWINTERHYDROLOGICALPLOCESSBECOMESCOMPLICATEDANDEXCEPTIVEFORITSUNUSUALLANDFORMCLIMATEANDDIFFERENTSURFACECONDITIONSNOWMELTWATERISHARDTOFORMTHESURFACERUNOFFFORITSSANDSOILWITHHIGHINFILTRATIONCAPACITYANDSAND耐GEWITHARBORIZATIONDISTRIBUTIONADDITIONALLYVEGETATIONANDLANDFORMOFGURBANTUNGGUTDESERTRESULTINNONUNIFORMITYOFSNOWCOVERANDSNOWMELTPROCESSHOWEVERITISLACKFORTHERESEARCHOFSNOWCOVERANDSNOWMELTPROCESSWITHINTHISAREASTUDYINGONSNOWCOVERANDSNOWMELTPROCESSWITHINTHISAREAITOARHELPUSTOAPPREHENDCAUSEOFFORMATIONOFUNUSUALLANDFORMWITHINTHISAREAITISSIGNIFICANTFORTHESTUDYONECOLOGICALWATERREQUIREMENTINARIDLANDANDREGENERATIONOFDESERTVEGETATIONTHEMAINSTUDYAREAISLOCATEDINTHESOUTHERNEDGEOFGURBANTONGGUTDESERTWHICHISBELONGTOTHEEXPERIMENTALSITEESTABLISHEDBYFUKANGDESERTECOSYSTEMRESEARCHSTATION,CHINESEACADEMYOFSCIENCES,BASEDONFIELDEXPERIMENTINSITU,SNOWINVESTIGATIONANDTHEMEASUREOFSOILPHYSICSCHARACTERISTICSPARAMETERINTHELABORATORYSNOWPHYSICSCHARACTERISTICS,SNOWDISTRIBUTIONPATTERNANDITSRELATIONTOVEGETATIONAREANALYSED,ANDTHESNOWMELTWATERINFILTRATIONPROCESSARESIMULATEDUSINGTHESOFTWAREOFHYDRUS一1D/2DTHECONCLUSIONSAREILLUSTRATEDASBELOW1THERELATIONOFSNOWDISTRIBUTIONANDVEGETATIONSNOWDISTRIBUTIONPATTERNWASDESCRIBEDBLOWINGSNOWISEXISTENCEINJANUARYANDFEBRUARYSO舔TOTHEFREQUENTLYHAPPENOFTHEGALETHECHARACTERISTICSOFTHEDISTRIBUTIONOFDESERTSNOWANDTHERELATIONBETWEENSNOWDEPTHOFDIFFERENTPLACES,DIFFERENTDIRECTIONANDHEIGHTOFTREEISSNOWATTHEFOOTOFSANDDUNEWASMOREUNIFORMITYANDDEEPER1820CM,SNOWATⅡLE姊OFSANDDUNEWASMORESHALLOWER1517CM,ANDSNOWTH、ICKNESSOFSHADYSLOPES2022CMWASDEEPERTHANTHATOFSUNNYSLOPES1518CMHALOXYLONAMMODENDROMEFFECTSSNOWDISTRIBUTIONSIGNIFICANTLYINDIFFERENTLANDFORMCONDITIONSOUTHEASTANDEASTWINDDIRECTIONARCUNIVERSALINWINTEROFGURBANTONGGNTDESERTSNOWINTHENORTHERNSIDEOFSTEMOFHALOXYLONAMMODENDROMATFOOTOFSANDDUNEISTHEDEEPESTTHEEFFECTEXTENSIONIS135CMWHENTHETREEHEIGHTOFHALOXYLONAMMODENDROMIS295CMSNOWINTHENORTHERNSIDEOFHALOXYLONAMMODENDROMINSHADYSLOPEISTHICKERANDEFFECTEXTENSIONIS195200CMWHENTHETREEHEIGHTIS373CMANDEFFECTEXTENSIONOFOTHERTHREEDIRECTIONIS165CMEFFECTOFHALOXYLONAMMODENDROMATTHETOPOFSANDDUNEONSNOWDISTRIBUTIONOFDIFFERENTDIRECTIONISINSIGNIFICANTANDEFFECTEXTENSIONIS130CMASTHEHEIGHTOFHALOXYLONAMMODENDROMIS286CMTHELARGERCROWNOFHALOXYLONAMMODENDROM,THEWIDEREFFECTEXTENSIONANDSNOWWITHINITSVERTICALSHADOWISSHALLOWER2THEPHYSICALCHARACTERISTICSOFSNOWCOVERANDSNOWMELTPROCESSFROMNOVEMBERTOJANUARYISTHESNOWACCUMULATIVEPERIODTHELASTTENDAYOFFEBRUARYTOTHEFIRSTTENDAYOFMARCHISTHEPERIODOFSNOWMELTANDTHESNOWRAPIDLYMELTPERIODISABOUT6DAYS,ANDTHEEQUIVATENTOFTHESNOWMELT
            下載積分: 4 賞金
            上傳時間:2022-07-26
            頁數: 61
            19人已閱讀
            ( 4 星級)
          • 簡介:河海大學碩士學位論文水資源生態足跡研究與應用姓名范曉秋申請學位級別碩士專業水文學及水資源指導教師姜翠玲20050501ABSTRACTTHEECOLOGICALFOOTPRINTEFOFFERSACHEAPANDRAPIDNATURALCAPITALAPPRAISALFORNATIONSWITHWHICHHUMANDEMANDSCANBECOMPAREDWITHNATURE’SAVAILABLESUPPLYFORHUMANUSENEECOLOGICALFOOTPRINTISANACCOUNTINGTOOLTHATEARLAGGREGATEECOLOGICALCONSUMPTIONINAILECOLOGICALLYMEANINGFULWAYITGIVESAS,THEREFORE,AREALISTICPICTUREOFWHEREWEAREINECOLOGICALTERMSBUTUNFOMMATELYITDOESN’TINCORPORATEFRESHWATERUSEINTOECOLOGICALFOOTPRINTBYWACKERNAGEL,THAT’SAGREATLIMITATIONONTHEASSESSMENTFORWATERRESOURCESSUSTAINABLEDEVELOPMENTAFTERANALYZEDTHEFRESHWATER’SCHARACTERISTICS,BASEDONWACKEMAGLEL’SEFMODEL,THESEVENTHACCOUNTISSTUDIED,DEFINEDANDSURNMARIZED,THETHREECRUCIALPARAMETERSINCLUDINGGLOBALAVERAGEYIELDFORFRESHWATERYIELDFACTORFORFRESHWATEREQUIVALENCEFACTORFORFRESHWATERARECONFIRMED,CALCULATEDATTHESAMETIME,THECALCULATIONMETHODSFOR行ESHWATERALSOAREDEFINEDTHEFRESHWATERACCOUNTISCOMBINEDTOWACKEMAGEL’SEFMODELAFTERTHAT,THEFRESHWATEREFISUSEDTOASSESSTHESUSTAINABLEDEVELOPMENTOFWATERRESOURCESONJIANGSUPROVINCEFROM1998TO2003,THEBERERMENTEFMODELISUSEDTOASSESSTHESUSTAINABLEDEVELOPMENTCONDITION013JIANGSUPROVINCEFROM1990TO2003THERESULTSSHOWTHATTHESEVENTHACCOUNTFORWATERRESOURCESISREASONABLE,WHICHPROVESTHEFRESHWATEREFMODELCALLBEUSEDTOASSESSTHESUSTAINABLEDEVELOPMENTOFWATERRESOURCESANDCANDOWELLINTHEBETTERMENTEFMODELKEYWORDSWATERRESOURCES,EFGLOBALAVERAGEYIELD,YIELDFACTOREQUIVALENCEFACTOR,SUSTAINABLEDEVELOPMENT
            下載積分: 4 賞金
            上傳時間:2022-07-26
            頁數: 76
            9人已閱讀
            ( 4 星級)
          • 簡介:華北水利水電學院碩士學位論文基于GIS的南水北調中線工程河南受水區水資源優化配置決策支持系統研究姓名董貴明申請學位級別碩士專業地質工程指導教師陳南祥20060201STUDYONGISBASEDDECISIONSUPPORTSYSTEMFOROPTIMALALLOCATIONOFWATERRESOURCESOFTHEMIDDLEROUTEOFSOUTHTONORTHWATERTRANSFERRINGPROJECTIONABSTRACTITISTHEBASISOFUNIFICATION,HIGHEFFICIENCYMANAGEMENT,ANDSCHEDULINGWITHLOCALWATERRESOURCESANDTRANSFERRINGTOOTHERLOCALITIESWATERRESOURCESFOROPTIMALALLOCATIONOFWATERRESOURCESOFTHEWATERRECEIVEDAREASINHENANOFTHEMIDDLEROUTEOFSOUTHTONORTHWATERTRANSFERRINGPROJECTIONASTHEMOSTIMPORTANTPART,AGISBASEDDECISIONSUPPORTSYSTEMDSSFOROPTIMALALLOCATIONOFWATERRESOURCESOFTHEMIDDLEROUTEOFSOUTHTONORTHWATERTRANSFERRINGPROJECTIONISBUILTTHREEMAINLYPROBLEMSARERESEARCHEDINTHISPAPERASFOLLOWSONE,THEMODELOFOPTIMALALLOCATIONOFWATERRESOURCESOFTHEWATERRECEIVEDAREASINHENANOFTHEMIDDLEROUTEOFSOUTHTONORTHWATERTRANSFERRINGPROJECTIONISBUILTBYTHEBASISPRINCIPLEOFSUSTAINEDDEVELOPMENTANDTHEWATERRESONRCESBALANCEOFSECONDSUPPLYANDNEEDWITHALLWATERRECEIVEDAREASWITHMANYRELATIVEVARIABLES,ITHASITSELFPARTICULARPARTSASWELLASOTHERSIMILAROPTIMALALLOCATIONMODELSOFWATERRECOURSESTWO,THEMETHODTHATTHETECHNOLOGYOFLARGESCALESYSTEMDECOMPOSITIONCOORDINATION,INTERACTIVEMULTIOBJECTIVEMODELANDIMPROVEDGENETICALGORITHMGAARECOMBINEDISDISCUSSEDFORTHEDISPOSALMETHODSOFMULTIOBJECTIVEPROBLEMS,AINTERACTIVEMULTIOBJECTIVEDECISIONMAKINGMETHOD,WHICHHASSOMEADVANTAGESSUCHASSIMPLICITYINTUITIONISTICANDGOODMANEUVERABILITYANDINCLUDESSINGLEOBJECTIVEIMPORTANTDEGREE,SINGLEOBJECTIVESATISFACTIONDEGREE,WHOLEOBJECTIVECOORDINATIONDEGREEANDPOLICYMAKERBASEDONEXTREMUMISPROPOSEDSINGLEOBJECTIVEPROBLEMSTHATAREOBTAINEDBYTHEWAYOFTRANSFORMINGARESOLVEDBYIMPROVEDGAABASICPROCESS,ALSOCALLEDAMENDING,ISADDEDINTOGA,WHICHMAKESITHASNATURALMANUALBINARYSTRUCTUREANDISCONSIDEREDTOBEREASONABLEFROMTHEPOINTOFVIEWOFSYSTEMBYUSEOFSEARCHPOPULATIONSCOOPERATINGWITHREFERENCEPOPULATIONTOEVOLVE,THECONCEPTION,SUCHASINFEASIBLEDEGREEANDTHRESHOLDVALUE,ETCISUSEDINTOSEARCHPOPULATIONSTOCONTROLTHEAMOUNTOFUNSOLVEDVALUES
            下載積分: 4 賞金
            上傳時間:2022-07-28
            頁數: 78
            2人已閱讀
            ( 4 星級)
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