The Shengli I Point Bar on the Yellow River Delta: Three-Dimensional Structures and Their Evolution

(整期优先)网络出版时间:2002-04-14
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PointbarsarewelldevelopedontheYellowRiverdelta,amongwhichtheShengliIpointbaristhemosttypical.Thepointbar,beingabout4kminlengthandseveraltenstomorethan100metersinwidth,islocatedonthesouthsideoftheShengliBridgeinKenliCounty,Dongying,Shandong.Itisatypicalfine-grainedpointbarwithsilt,whichispredominant,someclayandminorplantdebrisandclayboulders.TheShengliIpointbarhascomplicated3-Dstructures.Firstly,inaplaneview,itcomprisesmainlyeightsedimentaryunits,baredge,barridge,barplatform,barplain,barchannel,bargully,barpondandbarbay,developingsidebysideandsuperimposedonebyoneinacomplexway.Secondly,itsverticalstructuresareverycomplexduetothepartialsuperimpositionofthe8sedimentaryunits.Besideshydatogenesis,veryintensivewinderosion,eolian,iceandmeltwateractionsarealsovisibleontheShengliIpointbar.Thecomplexformismadeevenmorecomplicatedbecauseoftheaboveco-actions.