长江口横沙通道近期演变及水动力特性分析

基于近十年来的实测水文地形资料,分析了横沙通道河床演变基本特性和水、沙变化情况,初步揭示了横沙通道的基本演变趋势和动力特性。同时利用数学模型(SWEM),统一边界条件后,详细比较多年来横沙通道水动力因子变化过程,包括潮位、流速、流向、优势流等;通过长系列统一边界的潮流数模计算比较,分析了横沙通道水动力特性。最后结合实测资料及数模计算结果,分析了横沙通道的变化情况与北槽和北港变化情况的基本关系以及基本发展趋势。

Study on characteristics of hydrodynamic and morphological evolution at Hengsha Watercourse of the Yangtze Estuary, China

Over the past decade,the Hengsha Watercourse of Yangtze Estuary witnessed an unprecedented scale of human interventions and extensively utilization and development,and the river itself also suffered a series of slowly changes and variations.After full analyzing a long series of hydrological and topographic data,some hydrodynamic parameters and fluvial processes were chosen to analyze and research the response mechanism among the South Passage,the North Passage,the North Channel and Hengsha Watercourse in this paper.The specific causes and processes and the future growth pattern of Hengsha Watercourse were also preliminary discussed and researched.In turn,those conclusions would be used to explain many other phenomenons,such as deposition or erosion in some reaches,evolution of riverbed,velocity and water level changes,watercourse backfilling and so on.