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排序方式: 共有218条查询结果,搜索用时 250 毫秒
81.
82.
Volker SPORK. Research Engineer Institute of Hydraulic Engineering Water Resources Management Aachen University of Technology Kreuzherrenstrasse D- Aachen Germany Joachim JAHNKE Senior Researcher Institute of Botany Aachen University of 《国际泥沙研究》1997,(3)
I.INTRODUCTIONMOrphologicalprocessesinlotvlandriversaredond~actransportphenomenaoffineandcohesivesediments.AsthismaterialtendstobindtoxicagentsandthuSrepresentsapotentialdangerfortheaqUaticenvironmentitisofspotalinterestintennsOfwaterqualityinvestigations.BesidesthisapeOfenvironmentalprotectionfinesedimentsoftendepositinnavigationchannelsandimpedeshipping.implyingextensiveandexpensitredredging.Thesereasonsprot,e,thatthetranSPortbehal'iorOffinesedimentsshouldbeinvestigatedcarefullytogiv… 相似文献
83.
WAN Zhaohui Professor China Institute of Water Resources & Hydropower Research P.QBox Beijing China GAO Jianen Senior Engineer North-West Hydro-technical Science ReSearch Institute Yangling Shaangxi China ZHANG Anmin Director 《国际泥沙研究》1997,(3)
LIRRIGAnONALONGTHELOWERYELLOW~RYellowairisoneOfthemainwaterresourcesinNOrthChina.Sincetheames70diVersionslthees,28siphonsand30PUmpingstationshavebeenbuiltalongtheLowerYellowRad.Thetotaldischargingcapacityis3363m3lsacthetotalirrigationareaisnearlytwOInillinnh~s.Intheeighties,asanaVerage,Il.lxloom3ofwaterwasdiVertalfromtheYellowairannually.In198915.4-cio'm3ofwatCfwasdiVerted.AstheYdlowforerisaheavilysediment-ladenone,sedimentisdiVertedsimultalleouslywhenwaterisdiverted.Inthe… 相似文献
84.
Zhixian Cao Prot. Dr.-Ing.. Director of Institute of Hydraulic Engineering Tianjin University. Tianjin . China. Wensheng WangSenior Engineer Associate Director of Lower Haihe River Administration Bureau. Ministry of Water Resources. Tianjin 《国际泥沙研究》1997,(3)
I.~ODUCTIONSuspendedsedimenttransportcapacity(SSTC)ofopenchannelflowisoneofthebasicsubjectsinsedimenttransportmechanicsandsedimentationengineeringpractice.Mostexistingformulationsareempiricalandsemiempiricalorrestheavilyonassumptionswhicharenotyetjustified.Thisarisesmostlybecauseofthecomplexityoftheproblem.Forafullydeveloped,in-equilibriumflowinawiderectangularchannel,theSSTCcanbbdeterminedasfollowsor=n:,ty)cab)-dy=Ca'I(l)1I=J4(D)'exp[--V,(n)]'da(2)unwhereCTIsSSTC,uistheaveragedflo… 相似文献
85.
I.INTRODUCTIONSoilerosionareasinChinasearchto3.67millionkm'whichoccupies38.2%OfthewholeareainChina.Thesoilerosionregionisspreadingovertheti)holecountry.Amongthat,soilerosionbyrainfallistermedas"watererosion"whichisdistributedinmountainsandhillarea.soilerosionbywindistermedas"winderosion",mainlydistributedinareasalongtheGreatWall,soilerosionbyfreezeandmeltistermedas"freezeerosion",mainlydistributedinhighmountainarea.Inthepastfortyyears,manyintegrateharnessmeasureshavebeenaPPliedindiffer… 相似文献
86.
衡阳市清水塘矿区金,银成矿地质背景分析 总被引:1,自引:0,他引:1
清水塘矿区主要含矿地层是下古生界浅变质岩,代表地槽构造层,受地洼阶段的岩浆侵入。由于构造岩浆多期活动的叠加和3,形成金银成矿的有利条件。地洼阶段的岩浆活动不仅提供了成矿的驱动力,而且提供了成矿物质来源。 相似文献
87.
GAO Yitang Engineer Soil Water Conservation Bureau Yellow River Conservancy Commission Zhengzhou P.R.China. QI Pu Senior Engineer Institute of Hydraulic Research Yellow River Conservancy Commission Zhengzhou P. R. China 《国际泥沙研究》1997,(3)
Debrisflow,definedasakindofhighlycondensedtit!o-phaseflowofsolidandfluid,iscomposedofslurryandrocksofdifferentsizeswithageneraldensity'ofI.2to2.3t/m3.Theactivityliesbetweenfloodandlandslide.Itflowslikenormalfloodandsholvsturbulentstateaswithlesssolidcontentsandlowerviscosity,itisplasticviscousflowwithunstablegUstmovementwhellitisofhighsolidcontainsandhighviscosity.Debrisflowisformedunderthreebasicconditionsfprecipitousslopeoflandform,solidwasteoflargevolume,andenoughwatersupply.Theoccurrence,… 相似文献
88.
Liu Liping Engineer The Investigation Design Institute of The Second Navigation Engineering Bureau Ministry of Communications P. R. of China Wuhan 《中国海洋工程》1991,(4)
Through numerical modeling, a kind of simplified calculating method for standing wave pressure on vertical face breakwater have been put forward. Not only the formulas proposed in this paper are simple in form and very easy in use, but also they possess continuity on the full range of standing wave. And more, the precision requiremennts of calculation can be satisfied to a certain extent in engineering practice. 相似文献
89.
Fu Yuhua
Senior Engineer China Offshore Oil Production Research Center P.O.Box Beijing 《中国海洋工程》1997,(2)
Based on the linear wave,solitary wave and fifth order stokes wave derived by use of the Uni-fied Variational Principle of Water Gravity Wave(UVPWGW),this paper derives stream function wavetheory by using UVPWGW.This paper will handle the Kinematic Free Surface Boundary Condition(KFSBC)and Dynamic Free Surface Boundary Condition(DFSBC)directly and give the optimum solu-tion,instead of the conditions ∑(Q_(av)-Q_i)~2=min,and the related equations of stational condition.When the wave height H,period T and water depth D are given,the original stream function wave willbe determined,and can not be adjusted if it does not agree with the real case;in the present method,the ad-justment can be done by adding several constraint conditions,for example,the wave profile can be ad-justed according to the condition of accurate peak position.The examples given in this paper show that forthe original stream function wave,the DFSBC can be fairly well satisfied,but the KFSBC can not;howev-er,the stream function wave derive 相似文献
90.
Zhou Jiabao Zhang Jiachang Senior Engineer River Harbour Department Nanjing Hydraulic Research Institute Nanjing 《中国海洋工程》1992,(1)
-The effect of wave group on wave run-up on a slope dike is mainly discussed in this paper. Two simulating methods of wave group and their applications in laboratory are introduced. Synthesizing the research results of wave run-up on a slope dike, the effect of wave group on wave run-up on a slope dike in coastal protection engineering is studied as the main point. 相似文献