珠江口岛屿地貌单元的能量耗散和过程机制

发布时间：2017-12-28 14:15

本文关键词：珠江口岛屿地貌单元的能量耗散和过程机制　出处：《中山大学学报(自然科学版)》2017年04期 　论文类型：期刊论文

【摘要】：珠江河口及三角洲岛屿众多,岛屿地貌单元是沉积物及污染物的滞留区域。基于三维湍流精细模型,建立岛屿地貌单元的能耗分区模式,研究了不同分区的动力结构、湍流特性、能量转化、能量耗散特征及其驱动机制。结果表明,岛屿地貌单元的能耗空间分布特性可分为汊道区、湍流混合区、上游远区和下游区。湍流混合区主要为正压力项、水平对流项、底摩擦项和湍流应力项之间的平衡,其他区域的动力平衡主要是正压力、水平对流项和底摩擦项之间的平衡。研究成果有助于理解珠江河口及三角洲的现代动力过程及其发育演变过程。
[Abstract]:The Pearl River Estuary and the delta islands are numerous, and the island geomorphic units are the remaining areas of sediment and pollutants. Based on the three-dimensional turbulence fine model, the energy partition mode of island landform unit is established. The dynamic structure, turbulence characteristics, energy transformation, energy dissipation characteristics and driving mechanism of different geomorphic units are studied. The results show that the spatial distribution characteristics of the energy consumption of the island geomorphic units can be divided into the branch area, the turbulent mixing area, the upstream region and the downstream area. The turbulent mixing area is mainly a balance between positive pressure, horizontal convection, bottom friction and turbulent stress terms. The balance of other regions is mainly the balance between positive pressure, horizontal convection and bottom friction. The research results will help to understand the modern dynamic process and the development and evolution process of the Pearl River Estuary and delta.
【作者单位】：广东省水利水电科学研究院∥广东省水动力学应用研究重点实验室∥河口水利技术国家地方联合工程实验室;
【基金】：广东省水利科技创新项目(2016-12)
【分类号】：P737
【正文快照】： 与世界其他河口相比,基岩岛屿众多、地形边界复杂是珠江河口的重要特征,这些复杂的地形边界控制着径流与潮流的运动形式,产生了复杂的平均流结构,并影响其能量耗散[1]。对于河口物质、能量输运而言,岛屿地形单元改变了珠江河口的能量空间分布,岛屿后方往往是污染物或悬浮物的

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