崎岖列岛海区百年冲淤特征及其原因

Erosion and Accretion Characteristics and their Causes in the Qiqu Archipelago in the Recent Century

由南、北两列岛屿群组成的崎岖列岛海区，近百年来总体表现为淤积，年均淤积速率约２．３ｃｍ／ａ。然而，不同时期表现不同的冲淤演变过程。通过图件对比分析并结合海区水文泥沙和长江口河槽演变的研究得出，近百年来该海区总体冲淤演变主要受制于长江口河槽演变；而局部的冲淤变化与该海区独特的动力泥沙及其峡道效应有关，海区的冲淤分布特点反映出峡道效应的显著影响。

The sea area of the Qiqu archipelago shows an accretion trend with a rate of 2.3cm/a in the recent century. However, there exist different evolution processes in various periods. This paper examines the erosion and accretion evolution based on sea charts, combined with hydrodynamics and sediments, as well as channel evolution of the Changjiang estuary. The results suggest erosion/accretion for the entire sea area of the Qiqu archipelago. The results indicate that the erosion or accretion processes in the whole sea area are controlled by the channel evolution of Changjiang estuary. The local erosion along the strait channel area is related to hydrodynamics and sediments and their strait channel effects.