黄河调水调沙期间入海泥沙沉积动力过程的数值模拟
发布时间：2018-09-18 12:33
【摘要】：本文根据2007年黄河调水调沙期间黄河三角洲及其毗邻海域的水文、泥沙调查数据资料,使用Mike 3三维水沙数值模型模拟了黄河调水调沙全过程(低流量、高流量、高含沙量)入海水沙输运过程,揭示了人造洪峰下水沙扩散范围和特征,分析了泥沙入海后的沉积动力学机制。研究发现:入海淡水和表层细颗粒泥沙主要以异轻羽状流形式向外海和河口两侧沿岸扩散,中、底层粗颗粒泥沙向外海扩散非常有限,有少量向河口两侧沿岸扩散,扩散范围小于表层;河口区在涨-落、落-涨潮流转换时刻分别存在着潮流切变锋,切变锋均形成在浅水区,而后向深水区移动,切变锋的发生对泥沙向外海扩散有着明显的阻隔作用。
[Abstract]:Based on the hydrological and sediment survey data of the Yellow River Delta and its adjacent waters during the Yellow River water and sediment transfer period in 2007, the whole process (low discharge, high discharge) of the Yellow River water and sediment transfer is simulated by using the Mike 3 three-dimensional water and sediment numerical model. The transport process of high sediment content into seawater reveals the range and characteristics of sediment diffusion by artificial Hong Feng, and analyses the sedimentary dynamic mechanism of sediment after it enters the sea. It is found that the fresh water and surface fine granular sediment in the sea mainly diffused to the offshore and both sides of the estuary in the form of hetero-plume flow, and the coarse sediment in the bottom layer diffuses to the outer sea very limited, and a small amount of sediment diffuses to the banks of both sides of the estuary. The diffusion range is smaller than that of the surface layer, the tidal shear front is formed in shallow water and then moves to deep water in the estuary area at the transition time of rising-falling and falling-rising tidal current, and the shear front is formed in the shallow water area, and then moves to the deep water area. The occurrence of shear front has an obvious barrier effect on sediment diffusion to the sea.
【作者单位】： 中国海洋大学海底科学与探测技术教育部重点实验室;中国气象科学研究院灾害天气国家重点实验室;
【基金】：国家重点基础研究发展计划项目(2010CB951202)资助~~
【分类号】：TV148
[Abstract]:Based on the hydrological and sediment survey data of the Yellow River Delta and its adjacent waters during the Yellow River water and sediment transfer period in 2007, the whole process (low discharge, high discharge) of the Yellow River water and sediment transfer is simulated by using the Mike 3 three-dimensional water and sediment numerical model. The transport process of high sediment content into seawater reveals the range and characteristics of sediment diffusion by artificial Hong Feng, and analyses the sedimentary dynamic mechanism of sediment after it enters the sea. It is found that the fresh water and surface fine granular sediment in the sea mainly diffused to the offshore and both sides of the estuary in the form of hetero-plume flow, and the coarse sediment in the bottom layer diffuses to the outer sea very limited, and a small amount of sediment diffuses to the banks of both sides of the estuary. The diffusion range is smaller than that of the surface layer, the tidal shear front is formed in shallow water and then moves to deep water in the estuary area at the transition time of rising-falling and falling-rising tidal current, and the shear front is formed in the shallow water area, and then moves to the deep water area. The occurrence of shear front has an obvious barrier effect on sediment diffusion to the sea.
【作者单位】： 中国海洋大学海底科学与探测技术教育部重点实验室;中国气象科学研究院灾害天气国家重点实验室;
【基金】：国家重点基础研究发展计划项目(2010CB951202)资助~~
【分类号】：TV148
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