Analysis of Offshore Oil Pipeline Floating Laying     

Liang Zheng Lecture  Southwest Petroleum Institute  Nanchong  Sichun Province 《中国海洋工程》1994,(1)

-Based on the calculation model for the floating laying of the offshore oil pipeline, this paper analyses in detail the internal force, and deformation of the pipeline under a definite structural form (pipeline and buoy) and the way of pulling. The obtained results can be used for the buoy deployment, structure design, and the determination of pulling parameters (the pulling force of the cable and its length, etc.), providing an effective analysis method for floating pipeline-laying. A calculation example is given to show the related calculation process and the main results are analyzed and discussed.  相似文献   

赤道暖池区漂流浮标运动轨迹分析     

侍茂崇  刘士军  周冰  温之平 《中国海洋大学学报(自然科学版)》1993,(Z2)

TOGA—COARE强化观测期间,对赤道暖池区海流作了多种方法、多层次的观测;根据美国释放的漂流浮标不同时刻位置的资料,分别对赤道及其南、北海域的表层漂流状况作了计算分析,指出:从1°N向北存在单一的北向流;从1°N～1°S这个近赤道区域内为东向流;1°N～2°S区域为过渡区,以东向流为主,个别浮标出现涡旋状运动。2°S以南为一反时针运动的大涡旋。  相似文献   

Progress in Scatterometer Application   总被引：10，自引：0，他引：10  

W. Timothy Liu 《Journal of Oceanography》2002,58(1):121-136

Progress in the scientific application of space-based scatterometer data over the past two decades is reviewed. There has been continuous improvement in coverage, resolution, and accuracy. Besides the traditional applications in weather and ocean-atmosphere interaction, which are based on ocean surface wind vectors, emerging applications over land and ice are also described. Future missions and new technology are introduced. This revised version was published online in August 2006 with corrections to the Cover Date.  相似文献   

长江口基础生物资源现状及年际变化趋势分析   总被引：9，自引：1，他引：9  

王金辉  徐韧  秦玉涛  孙亚伟  刘材材 《中国海洋大学学报(自然科学版)》2006,36(5):821-828

探讨长江口生物资源可持续利用和对生物栖息环境的保护措施,2004年对长江口海域的基础生物资源进行4次监测。结果表明:浮游植物5月份有5门39属86种,8月份有6门48属139种,河口锋附近水域的浮游植物种类、数量较多,中肋骨条藻(Skeletonema costatum)在数量上处于绝对优势;浮游动物5月份为77种,8月份为91种,中小型浮游动物的数量在河口锋附近水域较高,主要优势种有针刺拟哲水蚤(Paracalanus aculeatus)等,大型浮游动物种类数量较高的区域位于长江冲淡水以外的海域,主要优势种为中华哲水蚤(Calanus sinicus)、五角水母(Muggiaea atlantica)、真刺唇角水蚤(Labidocera euchaeta);2004年共鉴定底栖生物146种,5月份63种,8月份108种,其中多毛类41种、甲壳类41种、软体动物32种、棘皮动物6种、鱼类21种、其他4种;长江口沿岸的崇明东滩、南汇边滩和嵊山岛共鉴定潮间带生物126种,其中5月份86种,8月份71种;鱼卵仔鱼计8目20科30属34种,鱼卵中绝大部分为凤鲚,其数量占95.7%,仔鱼以中华小公鱼出现频次最多。通过年际变化分析表明,长江口门以内区域浮游生物种类明显下降,长江冲淡水区域的生物资源基础饵料生物种类数基本保持稳定,浮游生物群落结构发生变化,硅藻比重减少,甲藻增加,长江口区域的潮下带和潮间带底栖生物种类数也存在不同程度的下降,以口门以内区域下降明显。  相似文献   

黄海地质构造与油气资源   总被引：13，自引：4，他引：13  

李廷栋  莫杰 《海洋地质前沿》2002,18(11):4-7

概述了南，北黄海盆地地质构造特征，盆地的形成与演化，分析研究了油气地质特征与成藏条件；对黄海各盆地和隆起区可能具有找油气远景的新领域，新层位和新类型，提出一些探讨性的认识。  相似文献   

山东胜利油田海洋石油勘探开发现状及前景分析     

罗玉斌  吕春宇 《海岸工程》2001,20(3):4-13

胜利油田海上勘探区 ,位于渤海湾南部的极浅海海域 ,其范围为 :西起四女寺河口 ,经套儿河口、老黄河口、新黄河口、小青河口 ,东到潍河口 ,海岸长 4 1 4km,胜利矿产登记线内面积 4 870 km2 ,水深一般 0～ 5m,最深 1 8m。截止 2 0 0 0年年底 ,已完成二维地震 71 3 6.1 km,三维地震 1 588.58km2 ,完钻探井 1 0 2口 ,测井解释油气层井 87口 ,试油 85口 ,其中 74口获工业油流 ,6口获低产油流。发现了埕岛、埕北 3 0、新滩 3个油田 ,在明化镇组、馆陶组、东营组、沙河街组、中生界、上古生界、下古生界、太古界中发现了 8套含油层系 ,6种类型的油气藏 ,已探明含油面积 1 45.8km2 ,石油地质储量 3 860 9万 t;控制含油面积57.5km2 ,石油地质储量 894 8万 t,其中埕岛油田是渤海域发现最早的亿吨级油田 ,目前已建成 2 1 6万 t年生产能力 ,累积产油 1 0 57万 t。根据两轮资源评价及勘探实践的认识 ,与本区有关的 8个生油凹陷 (岐口、沙南、渤中、埕北、桩东、青东、莱州湾、潍北 )总资源量约 1 2 .0亿 t,目前已找到探明加控制石油地质储量为 4 .75亿 t,仍有较大的勘探开发潜力。今后将对 8个构造带 (埕子口、埕岛、埕北 3 0、长堤、垦东、青东、青坨子、潍北 )进行勘探 ,落实探明储量 ,进一步投入开发 ,为胜利油田  相似文献   

好望角附近海域春季大风的几种主要形势分析   总被引：1，自引：1，他引：1  

马卫民  陈信雄 《海洋预报》2001,18(2):62-66

通过普查和分析，概括出了春季好望角附近海域三种主要大风出现时的模型图，并以一个月中逐日4次船舶测风报告为例，分析了好望角大风的某些主要特征。  相似文献   

High Frequency Current Fluctuations and Cross-shelf Flows around the Pycnocline near the Shelf Break in the East China Sea     

In-Seong Han  Koichiro Kamio  Takeshi Matsuno  Atsuyoshi Manda  Atsuhiko Isobe 《Journal of Oceanography》2001,57(2):235-249

Relation between internal waves with short time scale and density distribution near the shelf break in the East China Sea is studied utilizing moored current meters, thermometers and conductivity-temperature-depth (CTD) casts. A well developed pycnocline was frequently observed around 150–200 m depth near the shelf break accompanied with the development of internal waves with short time scale. During the cruise in May 1998, the intensified internal wave motion with short time scale and the distinct offshore flow were observed just below the lower pycnocline, which shoaled and extended above the shelf area. It is suggested that vertical mixing generated by amplified internal waves would produce cross-shelf ageostophic density current around the pycnocline. During the cruise in May 1999, on the other hand, the lower pycnocline was located offshore below the shelf break, and the internal wave motion was amplified just above the lower pycnocline. In this case, the offshore flow should be generated above the lower pycnocline, but vertical profiles of current velocity were not obtained because acoustic Doppler current profiler (ADCP) data were not available around the lower pycnocline.  相似文献   

Eddy Diffusion Coefficients of Suspended Particulate Matter: Effects of Wind Energy Transfer and Stratification     

Lars Chresten Lund-Hansen  Morten Pejrup  Jens Valeur  Anders Jensen 《Estuarine, Coastal and Shelf Science》1994,38(6)

Gross sedimentation rates (GSR) have been measured using sediment traps placed at nine different levels above the bed (0·3, 0·5, 0·8, 1·0, 2·0, 4·0, 6·0, 8·0 and 10·0 m). The sediment traps were deployed for 1·25 years and recovered 28 times during the study period. Low average GSR values of 5·5 g m^-2 day^-1 were obtained at 10·0 m, and high average GSR values of 114·8 g m^-2 day^-1 were obtained at 0·3 m. An expression for the eddy diffusion coefficient of suspended particulate matter (K_s), based on the measured GSR is given. The expression has been used for modelling of K_s at the different trap levels above the bed. High values (≈42 cm² s^-1) of K_s were obtained at the upper traps, whereas low values (≈2 cm² s^-1) were obtained near the bed. Comparison between level of turbulent energy in terms of shear stress at the boundaries of the water column, i.e. from the wind and the bed flow, showed that wind energy exceeded that of the bed flow by a factor 16. At 5·0 m K_s was positively correlated (r=0·66) to the eddy diffusion coefficient of momentum (K_m) derived from the wind energy transfer to the water, giving an average β of 0·5 for K_s =βK_m. The density difference between surface and bottom waters has been designated a parameter of stratification, and is discussed in relation to variations of K_s and K_m .  相似文献   

Seasonal Changes in Soluble Carbohydrates, Starch, and Energy Content in Mediterranean Seagrasses   总被引：2，自引：0，他引：2  

Helmut Pirc 《Marine Ecology》1989,10(2):97-105

Abstract. In all scagrass species investigated, rhizomes were the main storage organs for soluble carbohydrate reserves, and the highest levels were found in Cymodocea nodosa (U cria ) A scherson . Sucrose was the primary soluble carbohydrate identified in Posidonia oceanica (L.) D elile , and Zostera noltii H ornem . This disaccharide was dominant in Cymodocea nodosa roots, as well as in its rhizome in winter. Myo-inositol was the main cyclitol in Zostera noltii. In Cymodocea nodosa leaves 1-chiro-inositol was the main sugar component; it was also present to a lesser extent in the roots and rhizomes. The amounts of glucose and fructose were correlated with growth to a certain extent in all species. Higher amounts of starch were stored in the rhizomes of Posidonia oceanica and Zostera noltii. The energy content of Mediterranean scagrasses was significantly higher than in tropical species. No distinct seasonal trend in energy content could be observed.  相似文献