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1、上海海洋大学硕士毕业论文OptimizationDesignofChileanJackMackerel(Trachurusmurphyi)Mid-waterTrawlUsedby6000kWChineseFishingFleetABSTRACTMid-watertrawlisanefficientfishinggearforexploitingChileanjackmackerel(Trachurusmurphyi)insoutheastpacificusingthesingleboattechnique.Fisheryassessmentofrecentyearshaveindi
2、catedthattheresourceshavebeendeclining,andfishinggroundishardtobefound.Inthiscase,itneedstousetheoperatingcharacteristicsofmid-watertrawlstoimprovefishingefficiencybytargetfishingandtrackingfishing.Thecurrentnetproductionsaremainlyrelyonimportandsubjectedtoforeigncountries,theefficiencyofforme
3、rnetsisnothigh,meanwhile,theinternationaltrawlreformshavetowardafriendly,economicaldevelopment.Therefore,itisimperativetooptimizethedomesticjackmackereltrawl.Thispaperaimstofocusonthemodelexperimentofdomesticjackmackereltrawl,analyzetheperformanceofeachnets,determinethebasictrawlnetandproposea
4、optimizingdesignschemeoftrawl.Meanwhile,modelexperiencethedesignedtrawlanddiscussthedifferencesbetweentheoptimizedtrawlandthebasicone.ItisexpectedtoplayareferableandpromotingroleintheChina-designedChileanjackmackereltrawldesignprocedure.Thisstudycanbesummarizedasfollows:(1)Weanalyzethetenkinds
5、ofChileanjackmackerelmid-watertrawlandsumuptheparametersofthedomesticfishingboats.Theratedpowerrangeofthefishingboatsis5152~5920kW,andthelengthis91.1~104.41m,andthewidthis16~20m.Theseareallimportedsecond-handboats.TheL/Crangeofthetenkindsoftrawlis0.127~0.304,andtheLb/Crangeis0.119~0.260,andthe
6、Lw/Crangeis0.184~0.378.(2)Settingthefour-piecejackmackerelmid-watertrawlmanufacturedbySHANGHAIKAICHUANGDEEPSEAFISHERIESCO.,LTD,ofwhichtheparametersare1040m×253.02m(149.4m),1248m×285.00m(160.2m),1440m×361.00mIV万方数据上海海洋大学硕士毕业论文(228.6m),1440m×352.30m(242.4m)and1632m×444.00m(277.4m)asthefullscalev
7、alues,andthroughthemodelexperiment,wetexttheresistanceofthetrawlsandtheheightofnet-mouth,thenconcludethehydrodynamicperformanceofeachtrawl.Itcomestoaconclusionthat:(a)Theexpressionoftheheightofnet-mouthis-0.366H=0.0912CV.(b)Theexpressio
