辽河群沉积期古环境分析   总被引：4，自引：1，他引：4  

吴春林 《矿产与地质》1994,8(6):433-439

根据辽河群地质特征，岩石化学，稳定同位素特征分析认为：浪子山组沉积期方环境为浅海潮坪相；里尔峪组沉积期为强氧化泻湖相；高家峪组沉积期为强还原环境的泻湖相；大石桥组沉积环境为低能、还原环境的滨海碳酸盐台地相；盖县组沉积期为开阔正常浅海潮坪相。辽河群从发生发展到结束古环境演化规律是：构造上由优地槽向冒地槽演变；气候上由炎热转变为温湿；古地理环境从有障壁的局限海变为无障壁的开阔海，从咸化海向正常海，从泻湖相向潮坪相转化。物质补给由火山为主转为陆源碎屑为主。  相似文献   

鲁07井水位对固体潮滞后的处理   总被引：2，自引：0，他引：2  

张昭栋  耿杰等 《华南地震》1991,11(1):23-27

本文给出了一种计算考虑滞后影响的井水位固体潮系数的新方法，导出了计算固体潮系数和滞后时间的公式，给出了考虑滞后影响的井水位固体潮校正公式。以鲁07井为例，用该法求出其井水位固体潮系数为16.5mm/10^-8，水位对固体潮响应的滞后时间为0.48小时，与以胶的回归分析方法相比，校正后的水位中误差明显减小，校正效果比较好。  相似文献   

Wave Attenuation and Friction Coefficient on the Coral-Reef Flat     

朱良生黎满球  张洪生隋世峰 《中国海洋工程》2004,18(1):129-136

Several sets of S4 direction-wave-current-tide meters have been deployed on the coral-reef fiat of Yongshu Reef in the sea area of Nansha Islands. Based on the observational sea wave data, the attenuation characteristics of the waves propagating on the coral reef flat, the bottom friction coefficients and the transfer of wave energy are discussed in the paper. The results show that, in the relative depths of 0. 0613- 0.0867, the wave height attenuation per unit distance of wave propagation is 22.09 %-46.56%, with an average of 31.35 % ; the wave energy, attenuation coefficient, 33.74 %- 53.22%, with an average of 43.61%. The average of the bettom friction coefficients on the coral-reef flat is 0. 1346,which is about 10 times thai on the sand or silt bottom. In the couse of propagation on the reef flat, the waves sustain more loss in high frequency than in low frequency and the spectral energy transfers to the low frequency. These results may be used for reference in island and reef engineering.  相似文献   

Tidal eddies in a semi-enclosed basin: a model study   总被引：1，自引：0，他引：1  

Vethamony P  Reddy GS  Babu MT  Desa E  Sudheesh K 《Marine environmental research》2005,59(5):519-532

A modeling study has been carried out to support a Marine Management Plan for the Gulf of Kachchh, India and here the hydrodynamic part of the programme is described. The hydrodynamic model accurately predicts the tides and tidal currents present in the Gulf and these have been validated with the measured data, albeit at only a few locations. The time averaged residual currents obtained from the model for one lunar cycle clearly reproduce the complex, small-scale, topographically induced flows with several eddies. The existence of a dynamic barrier along Sikka-Mundra section, which divides the Gulf into two distinct dynamic systems, is very evident. The model is further used to predict the movement of surface floating particles launched at different locations in the Gulf, as an aid to determining floating pollutants. The results indicate that industries discharging wastes upstream of the barrier should use extreme caution, as these will remain in the vicinity for at least one lunar cycle.  相似文献   

黄茅海二维潮流的数值计算     

唐永明 《海洋科学》1992,16(3):26-31

将三维浅海流体动力学的流速分解模型简化为二维潮模型。在Ara-Kawa-B网格上,对黄茅海的潮位和潮流进行数值模拟。结果表明,黄茅海是一个往复流海区,与实际吻合较好。  相似文献   

MODIS遥感数据在福建省海岸带滩涂资源监测中的应用研究   总被引：1，自引：0，他引：1       下载免费PDF全文

张春桂 《海洋学报》2007,29(4):51-58

以2001~2005年MODIS数据为信息源,每年选取高潮位和低潮位两个时相的MODIS数据,根据滩涂对MODIS 250 m分辨率可见光和近红外探测波数的光谱反应特性,采用波段比值算法来监测福建省海岸带的滩涂面积,并对监测结果用罗源湾和福清湾30 m分辨率的Landsat-7/ETM+影像进行验证分析,结果表明,MODIS数据的观测时间与海洋高低潮位时刻比较接近,便于对滩涂资源的遥感监测.用MODIS数据计算的滩涂面积比用高分辨率的Landsat-7/ETM+数据计算的偏高.卫星遥感监测结果表明从1986至2001年福建省海岸带滩涂面积减少了107 km2,并且从2001至2005年滩涂面积也呈现逐年下降的趋势.  相似文献   

沿海滩涂开发强度与维持平衡的临界阈值探讨     

史英标  倪勇强  韩曾萃  鲁海燕 《海洋学研究》2006,24(Z1):35-48

在分析浙江省滩涂动态平衡实测资料的基础上,建立了沿海滩涂演变动态预测的数值模型,经飞云江河口丁山围涂工程等实测资料验证表明,该模型基本上反映了滩涂动态演变特性.在此基础上利用实测资料和滩涂动态预测数值模型计算出滩涂开发强度与动态平衡的临界阈值,探讨了维持滩涂动态平衡的对策与措施.指出滩涂开发利用与社会经济协调发展的关键是保持滩涂的动态平衡.  相似文献   

海洋底边界层中实测海流的垂直分布Ⅱ·潮流边界层     

乐肯堂  庄国文  宋金宝  侯一筠  朱兰部 《海洋与湖沼》2003,34(2):187-193

为了满足海洋工程设计的需要,作者从理论上研究了海底以上1－2m处潮流边界层的结构。把传统上用于稳定海流的底Ekman层理论发展成为用于潮流运动的振荡Ekman边界层,给出了潮流Ekman方程的解析解[式（32）－（35）],提出了对数边界层中潮流运动的方程组（式4－8）及其约束条件（式48）,并给出了潮流Ekman层与潮流对数边界层的匹配条件（式43）,还给出了计算浅海潮流垂直分布的解析表达式（36）－（39）。  相似文献   

Verification studies for a z-coordinate primitive-equation model: Tidal conversion at a mid-ocean ridge     

E.D. Zaron  G.D. Egbert 《Ocean Modelling》2006,14(3-4):257-278

We document the accuracy and convergence of solutions for a z-coordinate primitive-equation model of internal tide generation and propagation. The model, which is based on MOM3 numerics, is linearized around a state of rest to facilitate comparison with analytic estimates of baroclinic generation at finite-amplitude topography in a channel forced by barotropic tidal flow at its boundaries. Unlike the analytical model, the numerical model includes mixing of both buoyancy and momentum, and several definitions of “baroclinic conversion” are possible. These are clarified by writing out the energetics of the linearized equations in terms of barotropic kinetic energy, baroclinic kinetic energy, and available potential energy. The tidal conversion computed from the model, defined as the rate of conversion of barotropic kinetic energy into available potential energy, agrees well with analytical predictions. A comparison of different treatments of bottom topography (full-cells, partial-cells, and ghost-cells) indicates that the partial-cell treatment is the most accurate in this application. Convergence studies of flow over a smooth supercritical ridge show that the dissipation along tidal characteristics is, apparently, an integrable singularity. When the ocean bottom is not smooth, the accuracy and convergence of the model depend on the power spectrum of the topography. A numerical experiment suggests that the power spectrum of the resolved topography must roll off faster than k⁻² to obtain convergent results from a linear numerical model of this type.  相似文献   

应用卫星MSS数据对莱州湾主要经济贝类资源潜力的研究     

刘宝银 《中国海洋大学学报(自然科学版)》1987,(3)

滩涂,是国家重点资源开发区。因此,莱州湾生物资源已引起重视。但长期以来限于常规手段难以及时进行生产潜力的估价。本研究依据卫星遥感理论与技术,应用大地卫星MSS数据监督分类,将获取的地貌类型因子量值,配合生物定量采样相关因子参数,算得莱州湾主要经济贝类资源潜力。其资源量:文蛤(Meretrix meretrix)17505吨,四角蛤蜊(Mactra veneriformis)21886吨。这不仅具有经济意义,同时也有科学意义。  相似文献