Numerical Investigation of Vertical Turbulent Jets in Different Types of Waves     

鲁俊  王玲玲  唐洪武  丁全林 《中国海洋工程》2010,(4)

The effects of various types of waves on vertical plane turbulent jets are studied numerically in the paper. A three-dimensional numerical model in σ-coordinate is developed to study these problems by use of large eddy simulation method. Turbulence is modeled by a dynamic coherent eddy model. Numerical results including the distribution of velocity,the decay law of the mean velocity along axis,the turbulent Reynolds stresses and the volume flux per unit width without wave,in the first-order Stokes waves,in ...  相似文献   

A Boussinesq Equation-Based Model for Nearshore Wave Breaking     

余建星 张伟王广东  杨树清 《中国海洋工程》2004,18(2):315-320

Based on the wave breaking model by Li and Wang (1999), this work is to apply Dally‘ s analytical solution to the wave-height decay instead of the empirical and semi-empirical hypotheses of wave-height distribution within the wave breaking zone. This enhances the applicability of the model. Computational results of shoaling, location of wave breaking, wave-height decay after wave breaking, set-down and set-up for incident regular waves are shown to have good agreement with experimental and field data.  相似文献   

Integration of Real-Time Chemical Sensors for Deep Sea Research   总被引：7，自引：0，他引：7  

陈鹰叶瑛  杨灿军 《中国海洋工程》2005,19(1):129-137

There is a great demand for in-situ real-time chemical sensors in the oceanographic research, to measure the chemical components under the deep sea. The ISE (Ion Selective Electrode) is commonly used as a detecting part of deep-sea electro-chemical sensors. The paper highlights the solidification and micromation of the working and reference electrodes. The sensors of pH and H2S with a thermal probe are accomphshed after the solution of configuration of electrodes and signal processing. The sensor system has been tested successfully in the cruise of DY105-12, 14 sponsored by China Ocean Mineral Research and Exploitation Association(COMRA).  相似文献   

Impact of Brunswick River Mouth Training Walls on Adjacent Beaches, Brunswick Heads, New South Wales, Australia   总被引：1，自引：0，他引：1  

黄海军  Andrew D.SHORT  Thomas ZENG  David HANSLOW 《中国海洋工程》2004,18(2):207-220

1 .IntroductionTheBrunswickbeach barrierbegantodeveloparound 6 50 0yearsagoattheendofthepostglacialmarinetransgression .Onshoreandalongshoretransportofmarinesandsoccurredfollowingthestabi lizationofsealevelresultinginbeachandduneextensionwhichoccurredonmanyNSWbeachesuntilabout30 0 0to 1 0 0 0yearsBP (Roy ,1 980 ) ,followedbyperiodsofstabilitytorecession .TherecessionalongthenorthernNSWandsouthernQLDcoastisattributedtocontinuingnorthwardlongshoresandtransportestimatedatbetween 2 0 0 0 0 0m…  相似文献   

Wave Attenuation and Friction Coefficient on the Coral-Reef Flat     

朱良生黎满球  张洪生隋世峰 《中国海洋工程》2004,18(1):129-136

Several sets of S4 direction-wave-current-tide meters have been deployed on the coral-reef fiat of Yongshu Reef in the sea area of Nansha Islands. Based on the observational sea wave data, the attenuation characteristics of the waves propagating on the coral reef flat, the bottom friction coefficients and the transfer of wave energy are discussed in the paper. The results show that, in the relative depths of 0. 0613- 0.0867, the wave height attenuation per unit distance of wave propagation is 22.09 %-46.56%, with an average of 31.35 % ; the wave energy, attenuation coefficient, 33.74 %- 53.22%, with an average of 43.61%. The average of the bettom friction coefficients on the coral-reef flat is 0. 1346,which is about 10 times thai on the sand or silt bottom. In the couse of propagation on the reef flat, the waves sustain more loss in high frequency than in low frequency and the spectral energy transfers to the low frequency. These results may be used for reference in island and reef engineering.  相似文献   

Effect of Distortion Ratio on Local Scour Under Tidal Currents and Waves     

窦希萍  董凤舞 《中国海洋工程》2004,18(4):613-627

Five generalized physical models of drfferent distortion ratios were bruit according to DOU Guo-ren‘s similarity theory of total sediment transport modeling for estuarine and coastal regions. Experiments on local scour in front of groins were made under the actions of tidal currents and waves with clear and sediment entraining water. The scour depths under different dynamic actions are compared. The effect of the distortion ratio on the depth of scour hole is discussed. A relationship between scour depths for distorted and undistorted models is given.  相似文献   

Numerical Solution of Membrane Forces for A Free-Free Floating Plate with Large Deflection   总被引：1，自引：0，他引：1  

陈徐均  崔维成  宋皓  汤雪峰 《中国海洋工程》2003,17(2)

1 .IntroductionVerylargefloatingstructures (VLFS)haveattractedconsiderableattentionrecentlyduetoitspo tentialuseintheexploitationofoceanresourcesandintheutilizationofoceanspaces (Cui,2 0 0 2 ) .Owingtoitslargesizeandrelativelysmallthickness ,theinfluenceofelasticdeformationonthehydro dynamicresponseisimportant.Thisisknownashydroelasticity .Threedimensionallinear (Wu ,1 984;PriceandWu ,1 985)andnonlinear (Chenetal.,2 0 0 3)hydroelasticityiswellappliedtotheanalysisofthreedimensionalshipsando…  相似文献   

Hydrogen Peroxide, Organic Peroxides and Higher Carbonyl Compounds Determined during the BERLIOZ Campaign     

G. K. Moortgat  D. Grossmann  A. Boddenberg  G. Dallmann  A. P. Ligon  W. V. Turner  S. Gäb  F. Slemr  W. Wieprecht  K. Acker  M. Kibler  S. Schlomski  K. Bächmann 《Journal of Atmospheric Chemistry》2002,42(1):443-463

Gas-phase Hb>2b>Ob>2b>, organic peroxides and carbonyl compoundswere determined at various sites from Mid-July to early August 1998 during the BERLIOZ campaign in Germany. The sites were located northwest of Berlin and were chosen to determine pollutants downwind of the city emissions during a summer smog episode. Hydrogen peroxide (Hb>2b>Ob>2b>),methyl hydroperoxide (MHP, CHb>3b>OOH) and occasionally hydroxymethyl hydroperoxide (HMHP, HOCHb>2b>OOH) were quantified in air samples by commercial fluorimetric methods and classical HPLC with post-column derivatisation by horseradish peroxidase/p-hydroxyphenyl acetic acid and fluorimetric detection. Carbonyl compounds were determined in ambient air by a novel method based onO-pentafluorobenzyl hydroxylamine as derivatisation agent.Mixing ratio profiles of the hydroperoxides and the carbonyl compounds are reported for the intensive phase of the campaign, 20–21 July, 1998. Peroxides showed pronounced diurnal variations with peak mixing ratios in the early afternoon. At times, a second maximum was observed in the late afternoon. The major part of the Hb>2b>Ob>2b> was formed throughrecombination reactions of HOb>2b> radicals, but there is some evidencethat Hb>2b>Ob>2b> is also formed from ozonolysis ofanthropogenic and/or biogenic alkenes. Diurnal variations of mixing ratios of various carbonyl compounds are reported: alkanals (Cb>2b> to Cb>10b>,isobutanal), unsaturated carbonyl compounds (methacrolein, methylvinylketone, acrolein), hydroxycarbonyl (glycolaldehyde, hydroxyacetone) and dicarbonyl compounds (glyoxal, methylglyoxal, biacetyl), aromatic compounds (benzaldehyde, o- and m-tolylaldehyde) and pinonaldehyde.  相似文献   

Erratum to: Ambient Seismic Noise Tomography of a Loess High Bank at Dunaszekcső (Hungary)     

Gyöngyvér Szanyi  Zoltán Gráczer  Erzsébet Győri  Zdeněk Kaláb  Markéta Lednická 《Pure and Applied Geophysics》2016,173(8):2975-2975

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施用硼、钼肥对圆叶决明生长和叶肉细胞超显微结构的影响     

翁伯琦  黄东风  王义祥  罗涛  王煌平  应朝阳 《福建地理》2008,(4):31-36

通过盆栽试验探讨了红壤施用不同浓度的硼、钼微肥对圆叶决明（Chamaecrista rotundifolia）植株生长和叶肉细胞超显微结构的影响．结果表明,施用1．0、3．0、7．0mg·kg^-1的硼酸或0．5、1．0、4．0mg·kg^-1的钼酸铵都能增加圆叶决明的株高、分枝数、干物质重和硼／钼元素的吸收,稳定细胞壁、细胞膜、叶绿体膜的结构,增加叶绿体的数量;其中以3．0mg·kg^-1的硼酸或4．0mg·kg^-1的钼酸铵为最佳施用量．本研究证实了在施用的硼、钼浓度范围内,施用较高浓度的硼酸（7．0mg·kg^-1）会对植株产生一定的毒害,而施用高量（4．0mg·kg^-1）的钼酸铵并没有表现出明显的毒害症状．  相似文献