如东阳光岛建设对周边海域地形地貌的影响分析

基于近年来阳光岛区域的水下地形数据和定点全潮水文观测资料,从典型断面、等深线、区域等不同角度综合分析了阳光岛建设前后冲淤变化特征,建立了阳光岛建设对周边海域影响的11种响应关系,研究了阳光岛建设对周围地形地貌变化引起的影响,并对其成因进行了初步探讨。研究表明:阳光岛建设前5年（2004-2009年）与建设后5年（2009-2014年）潮流沙脊和潮流通道局部区域的侵蚀淤积状态发生一定的转变,可能与阳光岛建设引起的局部水动力条件发生微变有关,同时发现研究区潮流沙脊有一定的南移趋势,尽管整体上没有改变阳光岛区域的"水道-沙洲"系统,仍需加强对阳光岛周围潮流沙脊及水道进行长期监测和分析研究。

Effects of engineering construction on topography and geomorphology over the surrounding waters of Rudong Sunshine Island

The characteristics of erosion-deposition variation before and after the construction of Rudong Sunshine Island are analyzed from various aspects such as typical sections, isobaths and regional settings, based on the underwater topographic data and the fixed-point hydrological observation data in recent years, and 11 kinds of response relationship between engineering construction and environment of the Sunshine Island are established. In addition, the effects of engineering construction on topographic and geomorphological changes over the surrounding waters of the Sunshine Island are studied. Based on the response relationship, the cause of formation is discussed also. The result shows that the erosion-deposition state of local areas of tidal ridge and tidal channel has changed in some extent in five years before and after engineering, which may be due to the changes brought to the local hydrodynamic conditions by the engineering construction. It also dicoveries that the tidal ridge had some tendency to move southward, despite it hasn''t changed the stability of Channel-sand System as a whole. In view of this, long-term monitoring and dynamic analysis of tidal sand ridges and tidal channels around Sunshine Island need to be strengthened.