• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Oceanology >Modeling Suspended Sediments under Waves on Currents
【24h】

Modeling Suspended Sediments under Waves on Currents

机译：波浪作用下的悬浮泥沙建模

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

This paper concerns an analysis of the interrelations between the determinations of the near-bottom boundary condition for the suspended sediment concentration and the determinations of the conditions for the initiation of the sediment entrainment under a coupled action of waves and currents.It is assumed that the concentration field of the sediments entrained from the bottom composed of heterogeneous matter may be represented as a sum of the fields of uniform grain-size particle groups(fractions),whose concentrations in the suspended matter are proportional to those in the bottom sedimentary matter,while their movements are governed by the same laws.It is shown that the near-bottom condition for the closure of the problem on the concentration distribution of suspended particles under the coupled action of waves and currents,which was earlier introduced from the energy considerations,is compatible with the classical concept on the proportionality of the near-bottom sediment concentration to the critical value of the Schields parameter.It is also demonstrated that the concepts on the pickup functions and on the effective near-bottom shear stresses lead to similar mathematical formulations of the conditions of the initiation of the sediment entrainment;meanwhile,the effective near-bottom shear stresses are more physically meaningful.We found the dependence of the effective shear stress on the dimensionless particle diameter,which is characterized by an exponential decrease in the standard deviation of the vertical velocity pulsations with the distance from the bottom.An algorithm for the calculations of the vertical profile of the suspended matter concentrations under waves on a current is developed.The comparison performed between the calculated values and experimental data showed satisfactory results.
机译：本文涉及对悬浮泥沙浓度的近底边界条件的确定与波浪和水耦合作用下泥沙夹带开始条件的确定之间的相互关系的分析。由非均质物质组成的从底部夹带的沉积物的浓度场可以表示为粒径均匀的颗粒群（分数）的总和，其悬浮物中的浓度与底部沉积物中的浓度成正比，而它们的运动受相同的定律控制。研究表明，早在能量考虑的基础上，在波浪和电流的耦合作用下，悬浮粒子浓度分布问题的封闭的近似底部条件是与关于近底部沉积物浓度的比例的经典概念兼容还证明了关于拾取函数和有效的近底剪切应力的概念导致了泥沙夹带开始条件的类似数学公式;同时，有效的近底部剪切应力在物理上更有意义。我们发现有效剪切应力与无因次粒径的相关性，其特征在于垂直速度脉动的标准偏差随距底部的距离呈指数下降。在计算波浪作用下的悬浮物浓度的垂直分布曲线的基础上，对计算值与实验数据进行了比较，结果令人满意。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号