简介：Excavatingsandsandgravelonlandincombinationwithconstructingreservoirsforstoringfreshwaterisanidealapproachinatolls.Appropriateminingofgravelfromtheprogradinggravelbeachisacceptable.Diggingreefrockclosetotheedgeofthewideoceanreefflatwithoutsurfaceloosesedimentsonitorsandbeachcanbeaccepted.Excavatingsandfromsomedepthsinlagoonisascientificapproachparticularlyimportantforurbanizedatolls.However,selectingappropriatesitesforminingsandotherthanatsomedepthsinlagoonissuitabletoruralislandswithoutdensepopulations.Thesesitesincludeupdriftsideoflonggroinonthereeffiat,partlyfilledaccesschannel-port,outletofartificialchannelandlagoonmarginontheprogradingcoast.

简介：-BasedontheextendedMorisonEquationandmodeltests,thein-lineforcesonsmallsquarecylinderscausedbywaves(regularandirregular)andcurrentsareanalyzedindetailinthispaper.ThehydrodynamiccoefficientCDandCurelatedtoKCnumberandtheeffectofdirectionofwaveincidencearealsogiven,whichcanbeusedinengineeringpractice.

简介：Lengthfrequencydataofsmallyellowcroaker(Larimichthyspolyactis)wereacquiredfromthesurveyvesselinMay,July,SeptemberandDecember,2011inHaizhouBayofChina.Inthisstudy,921fishindividualswereanalyzedfortheestimationofgrowthandmortalityparameters.Betweenlengthandweight,thepowercoefficientbwas2.7321,2.9703,3.0418and2.7252forthe4surveyingmonths,respectively.TheestimatedvonBertalanffygrowthfunctionparameterswere230mm(L∞)and0.26yr-1(K)aswerecalculatedwithELEFANmethodequippedinFiSATcomputerpackage.Withlength-convertedcatchcurveanalysis,thetotalmortalityrate(Z)andits95%confidenceintervalwere2.16(1.69-2.64)yr-1,0.59(0.15-1.04)yr-1,1.16(0.80-1.52)yr-1and0.96(0.70-1.23)yr-1forthe4surveyingmonths,respectively,withthepooleddatathevaluewas1.15(0.81-1.48)yr-1.Thenaturalmortalityrate(M)was0.516yr-1aswascalculatedwithPauly'sequation(theannualaverageseawatertemperaturewas11℃).Therefore,fishmortalityratewas0.634yr-1.Theyield-per-recruitanalysisindicatedthatwhentcwas1,Fmaxwas0.7andF0.1was0.55.Currently,theageatfirstcaptureisabout1yearandFcurrentwas0.634.Therefore,FcurrentwaslargerthanF0.1andlessthanFmax.Thisindicatesthatcurrentfishmortalityisatadangerouslyhighlevel.WithGullandmethod,thebiologicalreferencepointforfishery(Fopt)wasestimatedas0.516yr-1,lowerthancurrentfishmortality.Accordingly,reducingcatchintheregionwasstronglyrecommended.

简介：当与大精力sparkers使用了时，海洋的多信道的小规模的高分辨率的地震察觉技术有高分辨率，高察觉的精确，一个宽适用的范围，并且是很灵活的。积极结果在海底的地质的研究被完成了，特别地在海洋的气体的调查水合物。然而，traveltime差别信息的数量在更短的传播长度的条件下面为速度分析被减少，因此导致速度的更差的集中光谱精力组和速度分析的更低的精确性。短安排的多信道的地震察觉技术的速度分析精确性是否能在天然气水合物探索满足实际申请的要求，当前因此是可争辩的。因此，在这学习气体的底部边界水合物(底部模仿反射镜，BSR)被用来进行数字模拟讨论与如此的技术有关的速度分析的精确性。结果显示出那更高主导的频率和更小的采样间隔不仅能改善地震分辨率，而且他们也补偿缺点短安排，从而改进速度分析的精确性。在结论，在这的速度分析的精确性小规模的、高分辨率的、多信道的地震察觉技术满足天然气的要求水合物探索。