击浪带内,外的波浪变形     

赵子丹  李贺青 《海洋通报》1992,11(4):1-6

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波浪和海底底床的相互作用(2)--底床应力及位移分布   总被引：1，自引：0，他引：1  

林缅 《地球物理学进展》2002,17(3):437-444

系统分析了波浪作用下海底底床中的应力及位移分布，考虑了不同加载波参数、弹性模量、饱和度及底床厚度对底床应力分布的影响,并计算了不同砂质的土骨架水平位移和垂向位移，比较了饱和底床和非饱和底床，这些结果可应用于海洋结构物的市场。  相似文献   

波浪作用诱发的黄河口水下斜坡失稳破坏   总被引：2，自引：0，他引：2  

单红仙  贾永刚  许国辉 《地学前缘》2001,8(3):130-130

随着近海工程的建设和海洋资源开发 ,对海洋工程地质条件研究日益受到重视。黄河是世界著名的多泥沙河流 ,1964— 1976年间由刁口流路输送到河口的泥沙每年高达10 6亿ｍ3左右。这样巨量的泥沙以极高的含沙量进入弱潮陆相河口 ,其中 90 %的泥沙都快速沉积在河口三角洲一带。其结果是 ,一方面 ,三角洲快速向海延伸生长 ,通常每年推进 1 5ｋｍ ;另一方面 ,高浓度泥沙快速沉积的结果是大量饱含孔隙水、欠固结的沉积物堆积在河口水下三角洲 ,这也造成了黄河频繁改道。快速堆积形成的黄河口水下斜坡 ,是我国油气资源开发的重要地区之一 ,同时也是…  相似文献   

新疆天山构造带成矿特征浅析     

吴文奎 《西北地质》1989,(1):6-12

新疆天山地区地质构造复杂,矿产丰富。建国以来,通过国内外专家,尤其是新疆地质工作者的艰苦努力和通力合作,获得了详尽的地质矿产资料。本文按波浪镶嵌构造观点,对新疆天山成矿特征进行初步剖析,仅供读者参考。  相似文献   

阿尔金山南缘断裂带的分段分带特征及其构造演化   总被引：4，自引：1，他引：3  

伍跃中  王战  陈守建  张转 《地质学报》2008,82(9):1195-1209

通过卫星遥感图像分析和野外调查,参考最新的地质调查和前人研究成果,系统总结了阿尔金山南 缘断裂带的构造特征,表明该断裂带具有沿走向上的多级分段性、横向上的多级分带性,其构造活动性质和运动方 向具有多级周期性反复的演化特点。这是地壳波浪状构造运动在阿尔金山南缘断裂带的具体体现。因此任何单 一的左行、右行或逆冲、正滑作用模式都不能全面、合理地解释其构造演化过程。  相似文献   

随机波浪作用下海床动力响应及液化的理论分析   总被引：2，自引：1，他引：1  

王忠涛  栾茂田  JENG Dong-Sheng  刘占阁 《岩土力学》2008,29(8):2051-2056

运用随机波浪理论,基于广义Biot动力固结理论,建立了能够考虑波浪荷载随机特性影响的计算海床动力响应及液化深度的解析数值模型,并从时域上进行求解分析.通过与传统线性规则波浪荷载作用下海床动力响应及液化深度的数值结果的对比分析,详细讨论了考虑波浪荷载的随机特性对于求解海床动力响应及液化深度的影响程度.结果表明,根据随机波浪理论计算得到的海床中的超孔隙水压力、水平有效应力、竖向有效应力、剪应力表现出较强的不规则性,其幅值沿着海床深度方向的变化趋势与根据线性规则波浪理论计算得到结果的变化趋势基本相同,但在同数量级上更大,同时计算得到的海床最大液化深度明显大于根据线性规则波浪理论计算得到的结果.因此,在海洋地基设计和自由场地安全评估时应该合理地考虑波浪荷载的随机特性.  相似文献   

长江口水流挟沙力公式初步研究   总被引：1，自引：0，他引：1  

邢云  宋志尧  孔俊  章卫胜 《水文》2008,28(1):64-66

本文根据泥沙运动理论和水流能量平衡原理,结合水流对泥沙的作用效果并分析了现有水流挟沙力公式的适用条件,通过实测资料的整理和研究,推导得出长江口水流挟沙力公式.结果表明,河口半潮平均挟沙力应考虑水流对悬移质的输送和对床沙中悬移质的上浮,同时还应考虑河口其它动力因素(如风、波浪等)及其各类动力过程的非线性作用效应对水流挟沙力的贡献.本文提出的公式从泥沙输运及悬浮的角度去分析河口水流挟沙力,从而有利于河口冲淤特性的分析研究.对长江口而言,洪季水流对泥沙的输运作用大于悬浮作用,落淤的可能性大于冲刷;而枯季水流对泥沙的作用则以悬浮为主,冲刷的可能性大于落淤,从另一侧面解释了长江口"洪淤枯冲"的现象.  相似文献   

多源卫星高度计海浪资料在中国近海的验证及应用     

孔亚文  张秀芝  盛立芳  陈报章 《海洋学报(英文版)》2016,35(11):86-96

Studies of offshore wave climate based on satellite altimeter significant wave height(SWH) have widespread application value. This study used a calibrated multi-altimeter SWH dataset to investigate the wave climate characteristics in the offshore areas of China. First, the SWH measurements from 28 buoys located in China's coastal seas were compared with an Ifremer calibrated altimeter SWH dataset. Although the altimeter dataset tended to slightly overestimate SWH, it was in good agreement with the in situ data in general. The correlation coefficient was 0.97 and the root-mean-square(RMS) of differences was 0.30 m. The validation results showed a slight difference in different areas. The correlation coefficient was the maximum(0.97) and the RMS difference was the minimum(0.28 m) in the area from the East China Sea to the north of the South China Sea.The correlation coefficient of approximately 0.95 was relatively low in the seas off the Changjiang(Yangtze River) Estuary. The RMS difference was the maximum(0.32 m) in the seas off the Changjiang Estuary and was0.30 m in the Bohai Sea and the Yellow Sea. Based on the above evidence, it is confirmed that the multialtimeter wave data are reliable in China's offshore areas. Then, the characteristics of the wave field, including the frequency of huge waves and the multi-year return SWH in China's offshore seas were analyzed using the23-year altimeter wave dataset. The 23-year mean SWH generally ranged from 0.6–2.2 m. The greatest SWH appeared in the southeast of the China East Sea, the Taiwan Strait and the northeast of the South China Sea.Obvious seasonal variation of SWH was found in most areas; SWH was greater in winter and autumn than in summer and spring. Extreme waves greater than 4 m in height mainly occurred in the following areas: the southeast of the East China Sea, the south of the Ryukyu Islands, the east of Taiwan-Luzon Island, and the Dongsha Islands extending to the Zhongsha Islands, and the frequency of extreme waves was 3%–6%. Extreme waves occurred most frequently in autumn and rarely in spring. The 100-year return wave height was greatest from the northwest Pacific seas extending to southeast of the Ryukyu Islands(9–12 m), and the northeast of the South China Sea and the East China Sea had the second largest wave heights(7–11 m). For inshore areas, the100-year return wave height was the greatest in the waters off the east coast of Guangdong Province and the south coast of Zhejiang Province(7–8 m), whereas it was at a minimum in the area from the Changjiang Estuary to the Bohai Sea(4–6 m). An investigation of sampling effects indicates that when using the 1°×1°grid dataset, although the combination of nine altimeters obviously enhanced the time and space coverage of sampling, the accuracy of statistical results, particularly extreme values obtained from the dataset, still suffered from undersampling problems because the time sampling percent in each 1°×1°grid cell was always less than33%.  相似文献   

热带太平洋波浪输运与海表面温度异常关系研究     

石永芳  吴克俭  朱现晔  杨帆  张宇铭 《海洋学报(英文版)》2016,35(9):58-66

Large-scale water transport is one of the key factors that affect sea surface temperature anomaly(SSTA) in the eastern equatorial Pacific(EEP).The relationship between the wave transport in the tropical Pacific and the SSTA in the EEP is examined by different methods,including band-pass filtering,period analysis,correlation analysis,significant analysis,and empirical orthogonal function(EOF) analysis.We have found that the eastward shift of the wave transport anomaly in the tropical Pacific,with a period of 2 a and enhancing the transport of warm waters from the western Pacific warm pool,precedes the increase of sea surface temperature(SST) in the EEP.The wave transport and the SSTA in the EEP have a maximum correlation of 0.65 with a time-lag of 6 months(transport variation precedes the temperature).The major periods(3.7 a and 2.45 a) of the wave transport variability,as revealed by the EOF analysis,appear to be consistent with the SSTA oscillation cycle in the EEP.Based on the first occurrence of a significant SSTA in the Ni?o 3 region(5°S–5°N,90°–150°W),two types of warm events are defined.The wave transport anomalies in two types present predominantly the west anomaly in the tropical Pacific,it is that the wave transport continues transport warm water from west to east before the onset of the warm event.The impact of wave-induced water transport on the SSTA in the EEP is confirmed by the heat flux of the wave transport.The wave transport exerts significant effect on the SSTA variability in the EEP and thus is not neglectable in the further studies.  相似文献   

斜向波浪作用下双层水平板式防波堤波浪荷载试验研究   总被引：1，自引：0，他引：1  

顾倩  黄国兴  张宁川  李龙祥  邵忠安 《海洋学报(英文版)》2016,35(12):100-109

In this study, systematic physical model tests were performed to investigate the wave forces on the twin-plate breakwater under irregular waves. Based on the experimental results, the effects of the relative plate width B/L,wave height Hs/D and incident angle θ0 on the wave forces were analyzed and discussed. The results showed that:(1) The envelopes of the total wave pressure were generally symmetrical along the direction of plate width under the incident angles(θ0) being 0°, 15°, 30°, 45° and 60°. In particular, the envelopes of wave pressure atθ0=30° were larger than all other cases.(2) The synchronous pressure distribution of the breakwater under oblique wave action was more complicated comparing to the normal incident waves.(3) Based on data analysis, an empirical formula was obtained to estimate the total vertical force of the twin-plate breakwater.This empirical formula can be a good reference for the design basis of engineering applications under specified wave conditions.  相似文献