Influence of Approach Channel on Wave Propagation with Varying Incident Angles     

Zuo Qihua  Yang Zhengji . Senior Engieer  River  Harbour Department  Nanjing Hydraulic Research Institute  Nanjing 《中国海洋工程》1996,(3)

- The variation of the amplitude of waves with varying incident angles when waves propagate through a typical approach channel is discussed by a numerical calculation method, the result of which shows that the influence of the channel on wave propagation is obvious. When the wave propagation direction is in coincidence with the channel axis, the wave amplitude ratio will decrease with the increase of propagation distance. When the incident angle is 15 - 30 , there appears an area of larger wave amplitude ratio on the side slope facing the waves, but at the another side, the wave amplitude ratio is generally small, indicating that the channel has a shielding effect. When waves propagate across the channel perpendicularly, the wave amplitude ratio can be calculated with the shallow water coefficient.  相似文献   

东海西北部水团分析及与渔场的关系     

刘树勋  韩士鑫  魏永康 《中国海洋大学学报(自然科学版)》1989,(Z1)

作者用聚类分析法划分浅海水团,目的在于克服大洋水团分析法进行分析所遇到的一些困难,它在根据不同海区特点确定临界值与检验值时有较大的灵活性。本文讨论了浅海变性水团与中心渔场的关系。结果表明,东海底层冷水、东海表层水和大陆沿岸水对渔业生产有重要影响。  相似文献   

大民屯凹陷地层水水文地质特征与油气聚集关系   总被引：6，自引：0，他引：6  

史建南  姜建群  张福功  闫家宁 《海洋地质前沿》2003,19(11):24-30

对大民屯凹陷前第三系潜山、下第三系沙河街组地层水化学场研究发现，本区油田水总矿化度及二价阳离子浓度偏低，地层水总矿化度具有明显的垂向分带性，水体主要为陆相成因并受地表水渗入的影响较大，变质程度高，油田水的演化与盐类的溶解有关。该区地层水的流动受断裂和沉积砂体的控制，在水头压力、浮力动力场控制下其流动样式和分布规律反映了凹陷内油气的运聚规律，可为本区自生自储、新生古储式油气藏的判别提供有利证据。  相似文献   

青岛市水环境污染及其防治对策     

赵秀春  初日邦  王成见  尚庆国 《海岸工程》2002,21(3):50-54

通过分析近几年青岛市地表，地下水水质监测资料，总结水环境污染地区分布规律，摸清水环境污染形成原因，对当前防污治污工作提出了对策建议。  相似文献   

沿海与内陆地下卤水对比分析   总被引：1，自引：0，他引：1  

焦超颖  何远胜  张旻 《中国海洋大学学报(自然科学版)》1994,(Z3)

分析对比我国滨海与内陆地下卤水的分布、成因及其水文地球化学特征，指出不同成因的地下卤水具有不同的水质．  相似文献   

Sugar and Lipid Components in Sea Foam near Kelp Beds     

Branko  Velimirov 《Marine Ecology》1982,3(2):97-107

Abstract. A component analysis of the sugar and lipid fraction in foam layers around kelp beds on the South African west coast showed the following trends: In the residue of foam drainage of both 12 h and 120 h old foam the sugar fraction is represented by mannose (33–41 %), galactose (4–30%), fucose (3–29%) and glucose (19–26%). With the exception of fucose, the same components could be found in foam filtration. In the lipid fraction the main fatty acids are palmitic (23.3–27.3%), oleic (14.0–5.5%) and timnodonic acid (11.2–9.1%). Selacholeinic acid was only found in 12 h old foam while lignoceric acid could not be located in foam filtration. Against expectation mannitol was not identified in quantifiable amounts in foam samples although it is the dominant component of kelp mucilage, whose presence is of major importance for foam formation. Hypotheses explaining the lack of mannitol are forwarded. Component sugar and lipid content for 11 of foam was calculated and estimation of sugar and lipid content in an average foam patch (volume of 30001) is given. The importance of foam formation as a mechanism for binding and transfer of energy in the marine environment is emphasized.  相似文献   

开发胶东温泉地热水对环境的影响   总被引：1，自引：0，他引：1  

栾光忠  范德江 《中国海洋大学学报(自然科学版)》1994,(Z3)

根据地热水中阴离子的组分与温泉水类型，指出其中Ⅱ＿１、Ⅱ＿２：型水温高，日采水量大，矿化度高，水质复杂，相应的环境效应明显．提出地热水的大规模开采以及尾水的大量排放，对温泉周边的生态环境、工程环境、土壤及地下水等方面有明显的影响．  相似文献   

Frequency-selective attenuation of sound propagation and reverberation in shallow water     

Qiu Xinfang  Zhang Renhe  Li Wenhu  Zhu Baixian  Jin Guoliang 《海洋学报(英文版)》1997,16(4):475-490

Ｆｒｅｑｕｅｎｃｙ－ｓｅｌｅｃｔｉｖｅ　ａｔｔｅｎｕａｔｉｏｎ　ｏｆ　ｓｏｕｎｄ　ｐｒｏｐａｇａｉｏｎ　ａｎｄ　ｒｅｖｅｒｂｅｒａｔｉｏｎ　ｉｎ　ｓｈａｌｌｏｗ　ｗａｔｅｒTXＦｒｅｑｕｅｎｃｙ－ｓｅｌｅｃｔｉｖｅａｔｔｅｎｕａｔｉｏｎｏｆｓｏｕｎｄｐ...  相似文献   

波浪作用下海床的有效应力分析   总被引：4，自引：0，他引：4  

吴梦喜  楼志刚 《海洋工程》2002,20(1):64-68

波浪作用下海床的稳定性分析是海洋工程地质评价的重要内容。海床的稳定性可通过计算分析其随时间变化的有效应力场来评估。本文建议了一个周期荷载作用下土体的本构模型 ,并用于计算波浪作用下海床的应力与变形。采用Biot固结理论和有限单元法 ,分析了海床的动态应力场与孔隙水压力场。波浪作用下两种渗透系数时有效应力的动态变化过程结果对比 ,反映了渗透消散作用对海床有效应力变化的影响  相似文献   

Circulation and Brackish Water Dispersal in a Coastal Lagoon of Southwest Taiwan     

Sen Jan  Shenn-Yu Chao  Jia-Jang Hung 《Journal of Oceanography》2001,57(6):647-661

Modest observations and numerical experiments were conducted to investigate circulation and brackish water dispersal in a coastal lagoon southwest of Taiwan. The Chi-Ku Lagoon, partially shielded from the sea by a string of sandbar barriers with two entrances among them, receives modest and episodic runoff from Chi-Ku Stream. Flood and ebb tidal streams entering and leaving the two entrances are found to converge and diverge in a flow stagnation area inside the lagoon. Under weak wind conditions, brackish water is preferentially retained in the flow stagnation area. Besides the observations, scenario runs using a three-dimensional numerical model also indicate strong modulation by monsoon winds. Both summer southwest monsoon and winter northeast monsoon reduce brackish water retention; the latter is found to be more effective. This revised version was published online in August 2006 with corrections to the Cover Date.  相似文献