Comparison among four kinds of data of sea surface wind stress in the South China Sea   总被引：1，自引：0，他引：1  

Xie Qiang  Wang Weiqiang  Mao Qingwen 《海洋学报(英文版)》2002,21(2):263-273

By using remote sensing (ERS) data, FSU data, COADS data and Hellerman & Rosen-stein objective analysis data to analyze the sea surface wind stress in the South China Sea, it is found that the remote sensing data have higher resolution and more reasonable values. Therefore we suggest that remote sensing data be chosen in the study of climatological features of sea surface wind stress and its seasonal variability in the South China Sea, especially in the study of small and middle scale eddies.  相似文献   

The Spatial Distribution of Caprellidea (Crustacea: Amphipoda): A Stress Bioindicator in Ceuta (North Africa, Gibraltar Area)   总被引：4，自引：0，他引：4  

José M. Guerra-García  & José C. García-Gómez 《Marine Ecology》2001,22(4):357-367

Abstract. The caprellid (Crustacea: Amphipoda) community associated with the alga Cystoseira usneoides (L.) Roberts 1967 was studied on a spatial scale in relation to the influence of environmental factors on the coast of Ceuta (North Africa) using multivariate analyses. Twenty-two stations were sampled and five environmental factors were tested (hydrodynamics, silting, suspended organic matter, organic matter in silt and suspended solids). The spatial distribution of the caprellid community reflected the physico-chemical conditions of the coast. Phtisica marina Slabber 1769 was the only species present at the stations of the harbour of Ceuta, characterised by the lowest values of hydrodynamics and the highest values of silting, suspended organic matter and suspended solids. The most exposed stations (high hydrodynamics and low values of silting, dissolved organic matter and suspension solids) were mainly dominated by Caprella danilevskii Czerniavskii 1868 and C. penantis Leach 1814. These two species have developed a "parallel" posture that enables them to attach strongly to the substratum and thus inhabit areas subjected to heavy exposure or strong currents. Caprella acanthifera Leach 1814 and Pseudoprotella phasma (Montagu 1804) preferred stations characterised by moderate values of silting and suspended solids, such as those located in the coastal areas in front of the city of Ceuta, but these species were not found at the most stressed harbour stations.  相似文献   

一个湍能封闭模型对风暴潮海底底应力的应用研究     

魏更生  汪景庸 《中国海洋大学学报(自然科学版)》1994,(2)

将一个三维湍能封闭模型应用于开阔海区的风暴潮，通过数值计算探讨了Ｔａｙｌｏｒ底摩擦二次率的拖曳系数随空间的分布及拖曳系数与水深、海底粗糙度、风向和风速等因素的关系。本文对底摩擦二次率的可靠性做了评价。  相似文献   

蒽胁迫对2种海洋微藻的毒性效应     

田继远  唐学玺  于娟  王晨  刘文明 《中国海洋大学学报(自然科学版)》2002,32(6):919-925

采用水生毒理学方法以及通过分析蒽对 2种海洋微藻的几种生理生化指标的影响 ,初步研究了蒽胁迫对 2种海洋微藻的毒性效应。结果表明 :随着蒽浓度的不断增大 ,1 2种海洋微藻的相对增长率逐渐降低 ,叶绿素 a和类胡萝卜素含量稍有下降 ,蒽对小新月菱形藻生长的 72 h· EC50为 2 51μg· L-1 ,蒽对亚心形扁藻生长的 72 h· EC50 为 387μg· L-1 ;2还原型谷胱甘肽 (GSH)含量逐渐降低 ;3加入外源性抗氧化剂 (GSH和甘露醇 )可缓解蒽胁迫所造成的 2种海洋微藻的细胞密度的降低 ,即可缓解蒽胁迫对微藻的毒害作用  相似文献   

塔里木盆地的构造演化   总被引：6，自引：0，他引：6  

杨克绳 《海洋地质前沿》2005,21(2):25-29

从地震大剖面显示，塔里木盆地发育为手风琴式的演化史。大体上形成有3层“断-坳”结构：①震旦系的“断”，古生界-三叠系的“坳”；②侏罗系的“断”，上白垩系的“坳”；③古近系的“断”，新近系的“坳”。断陷与坳陷分别由拉张与挤压应力场所致，这种应力场的变化是由相邻洋壳板块俯冲倾角由小到大的变化所引起的。由于地壳的多旋回运动，多次发生构造沉积演变，构成了多套生储盖组合，多领域、多种圈闭类型的油气藏，从震旦系-古生界-中生界-新生界，各断陷-坳陷结构的盆地都有可能形成油气藏的地质条件。  相似文献   

土工布充砂袋的应用及其研究进展   总被引：10，自引：1，他引：10  

张文斌  谭家华 《海洋工程》2004,22(2):98-104

对土工布充砂袋技术和国内外的应用进行了介绍。鉴于土工布充砂袋属于一种新兴起的土工新材料和新技术，在设计和工程实际中还存在着许多急待解决的问题，着重对各种典型状态和典型环境下的土工布充砂袋的变形、应力和土工布充砂袋堆的稳定性研究进展进行综述，最后提出进一步研究的思路。  相似文献   

DPD比色法测定电解海水产生的有效氯浓度   总被引：1，自引：0，他引：1  

陈佼骄  杜敏  韩冰 《海洋技术学报》2006,25(4):61-64

论文是用DPD(N,N-二乙基-1,4-苯二胺)比色法测定电解海水中的有效氯浓度,并将测定结果与碘量滴定法测定有效氯浓度相比较。此外,对该方法在海水中的实验条件进行了试验。结果得出,在海水环境下,DPD比色法在常温下,波长为550 nm,pH值6.5左右,显色后10 m in内测定。在海水中用此方法测定有效氯浓度的范围在0~2 m g/L,误差在5%以下。  相似文献   

Determination of the Critical Value of Deflection for Embedded Cylindrical Structures     

刘建起陈滨  王海艳 《中国海洋工程》2005,19(3):519-528

An embedded cylinder is a large-diameter cylinder embedded in a soil foundation. The state of failure of such an embedded cylindrical structure shows large deflection instead of slide and overturn of the traditional gravity type of structure placed on a rubble base or foundation base. The critical value of deflection of the embedded cylindrical structure, which is the maximum allowable deflection for stability calculation of the cylinder, is a vital control value. Through investigation on deflection and soil pressures on an embedded cylinder by model experiments, the variations of the angle of rotation θ of a cylinder with effective anti-overturning ratio η and moment MH of thrust are discussed. On the basis of experimental study, the critical value of deflection of the cylindrical structure is proposed in the paper. Meanwhile, the formulas for calculating deflection of cylinders are derived.  相似文献   

东亚岛弧地形横剖面与板块运动   总被引：2，自引：2，他引：2  

史学建 《海洋地质与第四纪地质》1997,17(4):91-99

通过对东亚岛弧横剖面形态的系统分析，并结合弧前的构造应力的分析，作者认为，东亚岛弧形成于板块东移的构造环境中，横剖面形态存在两种基本类型即内缓外陡型和内陡外缓型，这两种不同的横剖面具有不同的弧前应力，前者表现弧前挤压，后者表现弧前引张，这反映地貌形态与构造应力之间的密切关系。  相似文献   

Regression Formulations for the Stress at Hot Spot of Multiplanar Tubular DT Joints     

Chen Tieyun Zhang Huiyuan Professor  Shanghai Jiao Tong University  Shanghai Doctor of Engineering  Shenzhen Shipbuilding Trading Co. LTD. 《中国海洋工程》1993,(1)

- Stress concentration analysis of multiplanar tubular DT joints plays an important role in the fatigue design of offshore platforms. A semi-analytic method for stress analysis under the condition of any loads is briefly introduced in the paper. Nineteen multiplanar tubular DT joints with one of two braces of the same dimension subjected to axial loads and out- of- plane bending moments are computed for parametric stress analysis by using the present method. The influence of geometrical parameters on the stresses of multiplanar tubular DT joints is discussed and compared with corresponding uniplanar T joints. The regression formulae for the stress at hot spot of multiplanar DT joints are found by modification of SCF of corresponding uniplanar T joints. The parametric formulae for the maximum stress by superposition. Finally, the influences of stiffening effect and load-interaction effect on the maximum stress of DT joints are discussed.  相似文献