长江口北槽南导堤越堤输沙运动的时空变化特征研究.docx

长江口北槽南导堤越堤输沙运动的时空变化特征研究
摘要
长江口北槽南导堤是近年来长江口地区沙泥运移和冲淤变化的重要研究区域。本文基于1996年至2016年长江口北槽南导堤及其周边地区近20年的水文、地形、遥感和测绘数据，通过季节性和年际变化分析，研究了该区域输沙时空变化特征，并探讨了相关因素和机制。研究结果表明，近20年来长江口北槽南导堤一直处于输沙状态，输沙流量有明显的季节性和年际变化，表现为春季最多，夏季次之，秋季最少；年际变化显著，1999年和2000年沙量较高，2006年和2011年沙量较低。分析显示，输沙受多种因素影响，如受黄河泥沙补给、洪涝灾害和气象条件等；长江口北槽南导堤上游区域为主要的沙源地，下游汇流区域为沙的储存和分布区。文章从时空角度对长江口北槽南导堤输沙的特征进行了深入研究，为长江口的沙泥运移、冲淤变化等问题提供了科学依据和参考。
关键词：长江口北槽南导堤；输沙；时空变化特征；相关因素分析；沙泥运移
Abstract
TheNorthChannelSouthNavigationEmbankmentoftheYangtzeRiverEstuaryisanimportantresearchareaforthetransportanderosionanddepositionchangesinrecentyears.Basedonhydrological,topographic,remotesensingandsurveyingandmappingdataoftheNorthChannelSouthNavigationEmbankmentanditssurroundingareasfrom1996to2016,thispaperstudiedthespatialandtemporalcharacteristicsofsedimenttransportinthisregionthroughseasonalandinterannualanalysisanddiscussedrelevantfactorsandmechanisms.TheresultsshowedthattheNorthChannelSouthNavigationEmbankmenthasbeeninthestateofsedimenttransportfornearly20years,andthesedimenttransportflowhasobviousseasonalandinterannualvariations,withthemostinspring,followedbysummerandtheleastinautumn;Interannualchangesaresignificant,withhighersedimentloadsin1999and2000andlowersedimentloadsin2006and2011.Theanalysisshowedthatsedimenttransportisaffectedbymanyfactors,suchasthesedimentsupplyfromtheYellowRiver,flooddisastersandmeteorologicalconditions;TheupstreamareaoftheNorthChannelSouthNavigationEmbankmentisthemainsourceofsediment,andthedownstreamconfluenceareaisthestorageanddistributionzoneofsediment.Thisarticleconductedin-depthresearchonthecharacteristicsofsedimenttransportintheNorthChannelSouthNavigationEmbankmentfromaspatialandtemporalperspective,providingscientificbasisandreferenceforthetransportanderosionanddepositionchangesintheYangtzeRiverestuary.
Keywords:NorthChannelSouthNavigationEmbankmentoftheYangtzeRiverEstuary;sedimenttransport;spatialandtemporalcharacteristics;correlationfactoranalysis;transportanderosionanddepositionchanges