潮汐性质相似性判断的两个指标及其应用   总被引：1，自引：0，他引：1  

黄辰虎  马福诚  吕良  许家琨  孙雪杰 《海洋测绘》2007,27(6):12-15

提出采用时差法的相关系数和最小二乘潮位拟合法的推算中误差,作为潮汐性质相似性强弱判断的两个量化指标。根据实测潮汐数据进行了有关计算,结果表明这两个指标可以用于潮汐性质相似性强弱的快速判断,另外推算中误差还可以用于验潮站潮位数据缺测时推算精度的检验,建议在沿岸海道测量水位改正作业中综合使用。  相似文献   

The impact of the M₂ internal tide on data-assimilative model estimates of the surface tide     

E.D. Zaron  G.D. Egbert   《Ocean Modelling》2007,18(3-4):210-216

We use a synthetic data experiment to assess the accuracy of ocean tides estimated from satellite altimetry data, with emphasis on the impact of the phase-locked internal tide, which has a surface expression of several centimeters near its sites of genesis. Previous tidal estimates have regarded this signal as a random measurement error; however, it is deterministic and not scale-separated from the barotropic (surface) tide around complex bathymetric features. The synthetic data experiments show that the internal tide has a negligible impact on the barotropic tidal fields inferred under these circumstances, and the barotropic dissipation (a quadratic functional of the tidal fields) is in good agreement with the energetics of the three-dimensional regional primitive equations model which is the source of the synthetic data.  相似文献   

现场海域水平扩散系数的探讨　Ⅱ．黄河三角洲埕北海域的计算     

匡国瑞  陈伯海  徐天真  钱成春  俞光耀 《中国海洋大学学报(自然科学版)》1995,(3)

根据Ｔａｙｌｏｒ的湍流扩散理论和Ｈａｙ、Ｐａｓｑｕｉｌｌ提出的拉格朗日流和欧拉流的相关函数的相似性，用黄河三角洲埕北海域的实测资料，按四种不同方案计算出该海域的水平扩散系数和谱密度分布。指出：该海区潮流扩散系数主要受潮流的影响，其分布特征与潮流的分布基本一致，所求的水平扩散系数主要是由周期性的潮运动给予潮流扰动所致。方案４是通过富氏变换滤波消去了周期性潮流扰动，本方案计算的水平扩散系数是由周期为６ｈ以下的小尺度涡提供能量。  相似文献   

An inexpensive instrument for measuring benthic current velocity and direction at sea     

J. R. Craig  S. J. Kennelly 《Estuarine, Coastal and Shelf Science》1991,32(6)

An instrument which measures the velocity and direction of benthic water currents at depths of up to 80 m is described. Characteristics of this meter include: (i) readings are not affected by water flow during sinking or retrieval; (ii) it is portable; (iii) it operates unattended; (iv) it is inexpensive; and (v) it requires only simple maintenance. A timing circuit which operates two time periods in succession is used to activate and de-activate a revolution counter and a fluidfilled compass which are mounted on a special frame and vane system. In the field, the instrument accurately measured average current velocities of up to 6 m s⁻¹. Data are presented which illustrate the usefulness of this instrument in describing the velocity and direction of benthic currents along the east coast of Australia and demonstrate a positive correlation between benthic current velocity and catch rates of the commercially-exploited spanner crab Ranina ranina.  相似文献   

连云港近岸海域物理自净能力研究及水质预测——Ⅲ.西大堤建成后对物质输运的影响     

赵可胜  娄安刚  王学昌 《中国海洋大学学报(自然科学版)》1994,(Z1)

在连云港近岸海域计算潮流场基础上建立拉格朗日余流模型,并对连云港市两大堤建成前后的拉格朗日余流变化进行了分析,且选择有代表性的排污口进行了数值跟踪。  相似文献   

曲流点坝薄夹层构形对驱油效率及剩余油形成与分布的影响   总被引：3，自引：0，他引：3  

单敬福  纪友亮  史榕  柳成志 《海洋地质前沿》2006,22(4):21-25

陆相储层单砂体内的薄夹层是形成储层流体流动非均质的主要因素之一,单砂体内部薄夹层极薄、规模小、测井全部识别有一定困难,且位于层内。在油田开发初、中期作用不明显,而在高含水期、三采阶段,单砂体及其渗透率宏观分布已不能详尽揭示层内剩余油分布,层内薄夹层对注入剂驱油的影响及其重要性逐渐显现出来,与渗透率在储层内韵律性分布有同等重要的地位,也是储层精细表征的重要内容。以往只是着重从渗透率在储层内分布的不均衡的角度来研究储层中驱油效率问题,忽略了薄夹层的对储层驱油效率的影响。以大庆油田葡萄花油层组PⅠ2小层曲流河道砂体为例,对曲流河道砂体内部薄夹层构形对驱油效率及剩余油的形成与分布作了初步的分析和探讨。在排除开发因素差异的同井单砂体分析条件下,提出了“单砂体内部薄夹层空间构形 渗透率垂向序列 重力”三因素共同控制剩余油分布、驱油效率多段垂向序列模式。  相似文献   

Numerical study of enhanced energy dissipation near a seamount     

Nobuyuki Iwamae  Toshiyuki Hibiya  Yoshihiro Niwa 《Journal of Oceanography》2006,62(6):851-858

Using a two-dimensional primitive equation model, we examine nonlinear responses of a semidiurnal tidal flow impinging on a seamount with a background Garrett-Munk-like (GM-like) internal wavefield. It is found that horizontally elongated pancake-like structures of high vertical wavenumber near-inertial current shear are created both in the near-field (the region over the slope of the seamount) and far-field (the region over the flat bottom of the ocean). An important distinction is that the high vertical wavenumber near-inertial current shear is amplified only at mid-latitudes in the far-field (owing to a parametric subharmonic instability (PSI)), whereas it is amplified both at mid-and high-latitudes (above the latitude where PSI can occur) in the near-field. In order to clarify the generating mechanism for the strong shear in the near-field, additional numerical experiments are carried out with the GM-like background internal waves removed. The experiments show that the strong shear is also created, indicating that it is not caused by the interaction between the background GM-like internal waves and the semidiurnal internal tides. One possible explanation is proposed for the amplification of high vertical wavenumber near-inertial current shear in the near-field where tide residual flow resulting from tide-topography interaction plays an important role in transferring energy from high-mode internal tides to near-inertial internal waves.  相似文献   

半潜式超大浮体连接器动力特性的一种时间序列分析方法   总被引：1，自引：2，他引：1  

王璞  余澜 《海洋工程》2002,20(3):9-13

根据刚性模块弹性连接器 (RMFC)假设研究由 3个模块连接而成的半潜式超大浮体MobileOffshoreBase(MOB)的波浪载荷动力响应。模块和连接器动力响应根据时间序列法计算 ,这种方法包括海况模拟 ,波浪载荷计算和结构响应计算三个主要部分。通过对结构的适当简化 ,根据Airy波理论 ,Morrison公式以及流体中的结构运动方程、弹性连接器变形方程 ,计算求得MOB在不规则海况下的动力响应 ,并将其与相关文献中的结果进行比较 ,表明该方法有良好的精确性  相似文献   

A simple model to calculate the residual flows in a Spanish ria. Hydrographic consequences in the ria of Vigo     

Ricardo Prego  Fernando Fraga 《Estuarine, Coastal and Shelf Science》1992,34(6)

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潮汐调和分析的一种算法   总被引：1，自引：1，他引：1  

宋志尧  严以新  茅丽华 《海洋工程》1997,(3)

本文在常规潮汐调和分析方法的基础上，提出了一种由高低潮资料进行潮汐分析的算法。具体计算表明，该算法与现今通用的常规算法（即等间隔最小二乘法）相比，既可大大减少所需原始样本量，在相同记录长度内，是常规算法的三分之一还少，同时减少样本处理的前期工作量；又能保证潮位拟合的精度和预报的可信度，两者精度相当，结果一致。该算法原理简单、实用有效，对于局部样本缺损较易处理，具有实际应用价值。  相似文献