臺(tái)風(fēng)對(duì)東方岸外沙波沙脊和海底地貌的影響.pdf

1、中國(guó)海洋大學(xué)碩士學(xué)位論文臺(tái)風(fēng)對(duì)東方岸外沙波沙脊和海底地貌的影響姓名：董志華申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：地球探測(cè)與信息技術(shù)指導(dǎo)教師：薛榮俊曹立華20040601Theinfluenceoncurrentridge，sandwaveandtopographyofDongfangoffshorebytyphoonAbstractThecontinentalcurrentscanmaketheseabottomsandtoallkindsofsea

2、bedformsTheseabedform，whichgrowsparalleltothemaincurrent，iscalledthesubmarinecurrentridges，andsanddunesorsandwaves，whicharedevelopedverticaltothemaincurrentThesanddunesarethetypicalformsonthesandseabedThemigrationandmove

3、mentofsanddunesCanemptythesandoverlayingthepipesorburythepipesleadingtothebasedestabilizationofbuildings，andarethemarksoftheseaenvironmentalchangesThecurrentridgesandsandwaveshavecloserelationshipswiththemarineengineerin

4、g，navigationandmilitaryaffairs，SOtheyhavebeenamajorresearchfocusingeosciencesThestudyareaislocatedinthesoutheastoftheBeibugulfinSouthChinaSea，whichisoffseashoretoDongfanginHainanprovince(18。20’～19。ION，108。20’～108。50E、The

5、rearetwomajorkindsofseabottomtopographies：thecurrentridgeandsandwaveTheheightofsandwavesis155m，thewavelengthis1030m，andtheheightofthecurrentridgeis620m，thewavelengthis24kinThroughcomparingtheI000km’Ssonardata，700km’Smult

6、ibeamdata，and1200km’Sechosoundingdata，whichiscollectedbeforeandaftertyphoons，itiscalculatedthat：(1)Accordingtothetidesinnormalsituation，thecurrentridgesandsandwavesaredividedintothreepartsincludingeast，middleandwestregio

7、n，Byusingthemodifiedequations，thecalculationresultsrevealthat，intheshallowarea(theeastregion)，themovementspeedofthesandwaveis550m／aWhentheanglebetweenthecurrentridgeandwaterflowdirectionis10degrees，themovementspeedofthec

8、urrentridgeintheregionis01lm／aThewestregionbelongstodeepareaThemovementspeedis110m／aforthesandwaveand001—0lm／aforthecurrentridgeBecausetheflowspeedoftidesissimilarinthemiddleregion，thesandwaveisrelativelystable(2)Accordi