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1、由可能的西河迁至濡须水再到现代的裕溪河，及至下游入江的濡须口曾经发生的三次重大挪移也基本上经历了一个自西而东的变化。巢湖湖盆本身也经历着西部淤积，而北、东、南岸崩塌扩张的变化。（5）巢湖入江水系的变迁受到构造运动、气候变化、巢湖湖盆变化及人类活动的多种因素的影响和作用。地貌提供了水系演变的基础和条件,气候影响着来水来沙量，而构造运动控制着的水系的整体格局，并对水系的变迁产生最深远的影响，人类活动对近期河道的改变产生了重要的影响。自西向东的构造掀斜运动造成了水系自西向东移动的特点。关键词：古河道；信息提取；入江通道；水系变迁；巢湖Studyont
2、heInformationExtractionandEvolutionofOldRiverChannelbyUsingRSDatainEastofChaohuLakeAbstractChaohu-lakebasinislocatedinthemiddleofAnhuiProvince.SoutheastoftheareaisclosetoYangtzeRiver,northoftheareaiswatershedareasofYangtzeRiverandHuaiheRiver,northeastoftheareaisChuhedrainage
3、basin.withthewatersystembelongstoleftbankofYangtzeRiver.TheriversfromChaohuLakeinfloodintoYangtzeRiverdistributingintheeasternofChaohu-lakebasin,theriversystemfromChaohuLakeinfloodintoYangtzeRiverhaveoccurredaverysignificantchangeduetothenaturalenvironmentandhumanactivities.
4、Thispaperstudiedanddiscussedwithtwoaspectscontents:OneistheoldriversysteminformationextractiommeansfromSPOTdatabyremotesensingnumeralimageanalysisprocessing;Theotheris,itemphasize,RiversystemvicissitudecharacteristicfromChaohuLakeinfloodintoYangtzeRiver,andthereasonsoftheRiv
5、ersystemvicissitudewiththecomparativestudyofRSimages,reliefmaps,Geologicalmap,historicalpreference,chorography,fieldsurveyandetc.Wecancometotheconclusionsasfollows:(1)ForSPOTdatahasrichinformation,throughstudyonspectralcharacteristicsofthedifferenttypesofoldriverwaytype,beca
6、useoftheSPOTdatainstudyareahasspecialtimefeatures,weestablishinformationextractionmodelbasedonthespectralcharacteristicsinthefarmlandmaskimagewhichhaveexcludeotherinformationinterference,andBuildprocessoftheoldriverwayinformationextractionfromSupervisedClassificationtoFarmla
7、ndMasktoPrimaryComponentAnalysistoUndergroundOldRiverwayInformationExtractiontoInformationMergertoOldRiverSystemExtractionImage.(2)ThereisabigoldriversysteminwestoftheZhegaoRiverbasininGeologicalhistory.AccordingtotheChaohulakeshorechangesandhistoricalpreferencestudyspeculat
8、esthat:theoldriverhavetwopossiblewaystoinfloodintoYangtzeRiver:Oneisitgothr
