Theoretical Model and Dynamic Analysis of Soft Yoke Mooring System   总被引：2，自引：0，他引：2  

肖龙飞  杨建民  杨立军  李欣 《中国海洋工程》2008,22(2):195-204

As a popular solution for mooring an FPSO （Floating Production, Storage and Offloading） permanently in shallow water, the soft yoke mooring system has been widely used in ocean oil production activities in the Bohai Bay of China. In order to simulate the interaction mechanism and conduct dynamic analysis of the soft yoke mooring system, a theoretical model with basic dynamic equations is established. A numerical iteration algorithm based on error estimation is developed to solve the equations and calculate the dynanfic response of the mooring system due to FPSO motions. Validation is conducted by wave basin experimentation. It is shown that the numerical simulation takes only a few iteration times and the final errors are small. Furthermore, the calculated results of both the static and dynamic responses agree well with those ones obtained by the model test. It indicates that the efficiency, the precision, the reliability and the validity of the developed numerical algorithm and program are rather good. It is proposed to develop a real-time monitoring system to further monitor the dynamic performance of the FPSO with a soft yoke mooring system under various real sea environments.  相似文献   

Review of recent findings on the water masses and circulation in the East Sea (Sea of Japan)   总被引：1，自引：0，他引：1  

Kuh Kim  Kyung-Il Chang  Dong-Jin Kang  Young Ho Kim  Jae-Hak Lee 《Journal of Oceanography》2008,64(5):721-735

Recent findings on water masses, biogeochemical tracers, deep currents and basin-scale circulation in the East/Japan Sea, and numerical modeling of its circulation are reviewed. Warming continues up to 2007 despite an episode of bottom water formation in the winter of 2000–2001. Water masses have definitely changed since the 1970s and further changes are expected due to the continuation of warming. Accumulation of current data in deep waters of the East/Japan Sea reveals that the circulation in the East/Japan Sea is primarily cyclonic with sub-basin scale cyclonic and anticyclonic cells in the Ulleung Basin (Tsushima Basin). Our understanding of the circulation of intermediate water masses has been deepened through high-resolution numerical studies, and the implementation of data assimilation has had initial success. However, the East/Japan Sea is unique in terms of the fine vertical structures of physical and biogeochemical properties of cold water mass measured at the highest precision and their rapid change with the global warming, so that full understanding of the structures and their change requires in-depth process studies with continuous monitoring programs.  相似文献   

Isotopic tracers for water masses in the coastal region of eastern Hokkaido     

Sachiko Oguma  Tsuneo Ono  Akira Kusaka  Hiromi Kasai  Yasuhiro Kawasaki  Tomonori Azumaya 《Journal of Oceanography》2008,64(4):525-539

In this study we used two stable isotopes, δ¹³C and δ¹⁸O, for water mass classification in the coastal region off eastern Hokkaido. δ¹³C* values, which were corrected for the biological effect, and δ ¹⁸O values up to 300 m depth suggested that the isotopic character of the onshore and offshore water in the southern Okhotsk Sea, the Nemuro Strait and the western North Pacific could be explained by the mixing of three source waters: the Oyashio water (OYW), Soya Warm Current water (SWCW) and East Sakhalin Current water (ESCW). In summer, δ ¹³C*-δ ¹⁸O plots indicated mixing between SWCW from the southern Okhotsk Sea and OYW in the Pacific coast of southeastern Hokkaido, while temperature-salinity plots of the onshore water showed minimal difference from the offshore OYW. In winter, on the other hand, the mixed water of ESCW and OYW (or SWCW) appeared in the Pacific coastal region, distributed as cold, low salinity onshore water. Finally, we estimated mixing ratios of OYW, SWCW and ESCW in the coastal region of western North Pacific using their mean values of δ ¹³C* and δ ¹⁸O as endmembers. These results suggest seasonal and yearly changes of water mass combination en route from the southern Okhotsk Sea to the western North Pacific.  相似文献   

栖霞市马家窑金矿床成矿流体地球化学特征   总被引：1，自引：0，他引：1  

胡伟华  邱介玲  程鑫  林永芸 《山东国土资源》2008,24(1):26-29

马家窑金矿床是胶东地区比较典型的石英脉型金矿床代表,属中低温热液矿床,成矿流体盐度较低,气相成分以H2O,CO2为主,其次是Na^＋,Ca^＋和Cl^-,K^＋和F^-较贫,流体的成分与大气降水热液相类似。成矿流体的H,O同位素值则反映大气降水在不同温度和不同水／岩值条件下与栖霞超单元回龙夼单元交换后的分布特征,认为马家窑金矿床的成矿热液属大气降水成因。  相似文献   

济南张夏组灰岩岩溶地下水供水潜力探讨   总被引：1，自引：1，他引：0       下载免费PDF全文

韩祥银  韩亮  付春升  方庆海  王集宁  刘广哲 《山东国土资源》2008,24(12)

济南南部广布巨厚张夏组灰岩,其中赋存优质丰富的岩溶地下水。出露众多泉水,其流量为800～8000m3/d。该文通过简述济南地区张夏组灰岩岩溶地下水的赋存条件与水文地质特征,概略计算与评价其资源量,论证开发利用这一新水源的可行性,以期为济南供水与保泉开辟新途径。  相似文献   

对黄土地区钻孔和探井试样试验指标的分析评价          下载免费PDF全文

高喜政  盛根来 《山东国土资源》2008,24(10)

通过对济南地区次生黄土所采集的钻孔和探井土样进行浸水试验,并对其主要物理力学指标进行了分析评价,得出探井试样比钻孔试样所具有的试验指标更为真实可靠,因此次生黄土分布区采集探井试样进行湿陷性浸水试验是十分必要的。  相似文献   

宁阳县蒋集镇彩山小流域水土保持技术研究          下载免费PDF全文

张修脉 《山东国土资源》2008,24(2)

该文分析研究了彩山小流域的区域坡度和土壤特性,并根据区内土壤性质划分出4个小区域,即:自然坡度在20.～25°内为V1区,15°～20°内为V2区,10°～15°内为V3区,5°～10°内为V4区,分别反映了不同的土壤等级及土壤抗冲能力.同时,也研究出了一个系统化、理论化的科学依据i=V1035B,并对所有砂石山区水土保持治理工作具有借鉴性和实用性.  相似文献   

Experimental study on pore water pressure dissipation of mucky soil     

《世界地质(英文版)》2008,11(4)

Pore water pressure has an important influence on mechanical properties of soil. The authors studied the characteristics of pore water pressure dissipating of mucky soil under consolidated-drained condition by using refitted triaxial instrument and analyzed the variation of pore pressure coefficient with consolidation pressure. The results show that the dissipating of pore water pressure behaves in different ways depends on different styles of loading. What is more, the pore water pressure coefficient of mucky soil is less than 1. As the compactness of soil increases and moisture content reduces, the value of B reduces. There is a staggered dissipating in the process of consolidation, in which it is a mutate point when U/P is 80%. It is helpful to establish the pore water pressure model and study the strength-deformation of soil in process of consolidation.  相似文献   

应用Argo资料分析西北太平洋冬、夏季水团   总被引：1，自引：0，他引：1  

孙朝辉  许建平  刘增宏  童明荣  朱伯康 《海洋通报(英文版)》2008,10(2):1-13

应用Argo剖面浮标观测的温、盐度资料,分析了西北太平洋海域冬、夏季的温、盐度分布、水团结构及其分布。首先采用T-S点聚图法分析了该海域水团分布的基本情况,由点聚分析结果可知,该海域至少存在6种以上水团;再用模糊聚类软化法对水团作进一步划分,分别计算了该海域6至11类水团的F和△F值,结果表明,冬、夏季的△F值都以划分为8类时为最大,这与大洋水团的稳定性是一致的,因此,该海域冬、夏季水团以划分为8类最佳,它们分别是北太平洋热带表层水、北太平洋次表层水、北太平洋中层水、北太平洋副热带模态水、北太平洋深层水和赤道表层水,以及南太平洋次表层水和南太平洋中层水。  相似文献   

广利港河道水位变化及河口拦门沙地形变化分析研究     

林维田  吴永亭  刘建立 《海岸工程》2008,27(3):9-14

根据1984年和2007年两次对广利港航道水深测量的结果,分析研究了广利港航道内的水位变化规律,以及河口拦门沙的地形特征。结果表明广利港航道内水位变化复杂,拦门沙形态改变,水深变浅,原有的航道已经消失。  相似文献