長江、錢塘江來水對舟山海域水質的作用研究.pdf

1、浙江大學碩士學位論文長江、錢塘江來水對舟山海域水質的作用研究姓名：劉瑤申請學位級別：碩士專業(yè)：港口、海岸與近海工程指導教師：周起舞姚炎明2002.3.1浙門人學碩1學位論文EffectofDischargesfromYangtseRiverandQiantangRiverontheWaterQualityinZhoushanAreaAbstractTreatingYangtseEstuaryHangzhouBayandZhotheaut

2、horsimulatedtheefectofdischargesfrominZhoushanAreaushanAreaasawholeandusingDEFLT3DMODELYangtseRiverandQiantangRiveronthewaterqualityFirsttheflowmtheregionwascalculatedandbycomparingwiththemonitoringdataondiferenipointsat

3、diferenttimesitcanbeinferredthattheflowsimulationisreasonableonalargescale.Themodelhadsucceededinsimulatingtheprocessesoftransmissionanddeformationofthetideinthisregion.Usingtheaboveinformationtheauthorthensimulatedthety

4、picalflowinstunnerandwinterintheresearchregionandgottheseasonalFullerresidualflowpaternsThenthepollutionloadsgeneratedfromYangtseRiverQiantangRiverYongRiverCaoeRiverandHuangpuRivercatchmentsweredetermined.Furthermorethey

5、weregroupedunderthreeheadingsloadscrossingriverboundarypointsourcepollutionloadsdischargedoutsideoftheriverboundarydrainageloadsdischargeddownstreamoftheboundary.Andcombiningwiththeresidualflowinformationthelongtimemasst

6、ransportinthisregionwasdiscussedAccordingtothefielddatasomeimportantprocessesaboutCODsNandPwereselectedinwaterqualitysimulationandtheirdistributionsinsummerandwinterweresimulatedandcalibratedSubsequentlythepredictionanda

7、nalysisweremadetocoverarangeofsituations.Intheenditcameouttheconclusionsasthefollowing(I)AboutCOD:nomatterinsummerorwinter.CODsloadfromeitherYangtseRiverorQiantangRivercantsignificantlyinfluencethedistributioninZhoushanA

8、rea.TheCODconcentrationsintheresear中regionarebothbelow2mgl.Whilebyfurthercomparisonitfordsouttheinfluenceinsummerismuchbiggerthanthatinwinter.卜(2)AboutN03:FromtheresearchwefindouttheefectofYangtseriverisdominantbyratingt

9、o50“85%ofthewholeandthefollowingaccountingto15%50%isthatofthelongshoreflowfromNorth.JiangsuProvinceandTaiwanwarmcurrent.TheefectofdischargefromQiantangRiveraccountstolessthan10%(3)AboutP仇‘一:insummertheefectofYangtseriver

10、accountstoabout20%50%thebackgroundconcentrationabout50%570%andthatofQiantangRiverislessthan10%.Howeverthereisalitlediferentinwinter.TheefectofthebackgroundconcentrationisgetingbiggerthanthatcausedbyYangtseRiverandtheform

11、eraccountstoabout60%85%whilethelaterabout15%40%andtheefectofQiantangRiverstillkeepsinsignificantThenutrientconcentrationisincreasedintheinshoreregionespeciallyaroundtherivermouthsofYangtseRiverCaneRiverYongRiverandthesew

12、eroutfallsofShanghaiCity.BycomparisontheefectofShanghaiseweroutfallsisdominantamongtheabovesourcesanditsinfluencingregionmainlyincludesthenorthofHangzhouBayandthesouthgrooveofChangjiangEstuary.Butingeneraltheyallcantinfl