工程影響下的細(xì)沙粉沙質(zhì)岸灘地貌演變——以江蘇省茅家港附近岸段為例.pdf

1、累取弓：!：!!二：衛(wèi)：!：!墮罾級(jí)：坌五南京師冠犬掌博士學(xué)位論文園工程影響下的細(xì)沙粉沙質(zhì)岸灘地貌演變——以江蘇省茅家港附近岸段為例作者：王軻道院系：地理科學(xué)學(xué)院指導(dǎo)教師：王建教授自然地理學(xué)AbstractAbstractThepaperstudiedchangesofbeachlandformimpactedbycoastalengineeringbytakingexampleofMaojiagangs口entchwhichliesi

2、nLvsierosioncoastJiangsuprovinceWestartedwithanalyzingthebackgroundofLvsicoasLappliedtheGIStechnologytomakethelandformmapdigitizationsoastoformtheDEMofdifferentperiodWeappliedthemethodsuchasthesectioncomparisonandDiMcalc

3、ulationandanalysisandreferredthefieldsurveytostudythebeachlandformchangebeforeandaRerthee：agineeringconstructingbyusingboththequalitativeandquantitativemethodsAtthesametime，weappliedthephysicalmodeltoacceptitBasedOnapply

4、ingtheassistantmeasuresuchasthechangeofgrainsize，susceptibilityandsporepowderofthebeachsedimentwestudiedthechanceandmechanismoferosiondepositionofthebeachsurfaceandusedmathematicalcalculationtoanalyzethetrendoferosion—de

5、positionofthebeachsurfacebetweenthetwojet【iesandinsidetheotisherebreakwatersWedrewthemainconclusionsasfollowing：1AfIertheconstructionwascompletedthebeachbetweenthetwojeaieshadbeenfilledupstepbystepThepositionofsearoutean

6、dthedepthissteadyThebeachonthewestofjettyisontheconditionoferoslonandthebeachontheeastofjettyisolltheconditionofdepositionThebeachoutofthejettyisonthenaturalconditionoferosiondepositionnesearouteisinastateofnaturalswayTh

7、enaturalchangeofthebanknearbyMaojiaganghasthecharacteristicofseasonalchange：thesandsurfaceisfilleduDmspringandsummerandisflushedinfallandwinte￡Thesedimentorjettywasintheproportionof62percentbetweenNovin】991andDecinJ992an

8、dtheaveragerateofsedimentwasO008476m／monthBetweenDee1992andSep1993theproportionwasonly218percentandtheaverageratewasjust0004439m，monthThebeachsurihceinsidethejettyhadgotabalanceoferosionandsedimentuntilSeptemberl9932Afte

9、rtheconstructionofoffshorebreakwaterhadbeencompletedthestateofthebeachsurfaceoutsidetheoffsherebreakwatertumedfromflushtosedimentNearerthedistancetotheo凰herebreakwateriseffeCtSofsurlhcesedimentinsidetheo魅herebreakwateris

10、thebetterandtbrmedthenewsurfacethathasCOHISCinclinewithinitialsurfaceduetodeposition3ThedistributingandchangeofgranulariDsusceptibifityandsporepowderdistributionaccordwiththechangeofsurfacesedimentdynamicerosiondepositio

11、nWiththedistancefromsurthcetobeachincreasingthegranularityofdepositionisthickerandthesusceptibiliwaugmentthegranularit、‘ofthesedimentinsidethejetlyislessthantheoutsideandthesusceptibilityislessthantheoutsideItreflectstha

12、tthemnamlcconditioninsidethejettyisweakerthantheoutsideThegranularityofthehistogramsectionandthedistribufingandchangeofsusceptibililyandsporepowderinsidetheoffshorebreakwatershowa3or4gyrationitindicatesthatthebeachsurfac

13、esedimenthasgotabalancdconditionuntil3to4yearsaftertheoffshorebreakwaterwascompleted4Thedistributionofthebeachsurfacenearbytheengineeringafterthecompletionofsiltycoastdiflersfromthedistributionthatafterthecompletionofsan

14、dyandmuddyCoastitformedaspecialconfigurationoferosiondeposition：UpriverofthejrtryhasbeenflushedandthedownriverhasbeenrifledupafterthesiltycoastalengineeringwascompletedAtthebeginningthesedimentheadlandcausedbyoffshorebre