倾倒活动对嵊泗上川山倾倒区及周边海域海底地形的影响研究

嵊泗上川山海洋倾倒区于2010年11月正式获批，至今已使用10年，共接纳疏浚物4108.4万m3，为洋山深水港区的建设提供了有力保障。本文对2015－2017年的水深地形跟踪监测数据进行冲淤变化分析，分析了倾倒区及周边海域海底地形的变化特征，研究了疏浚物倾倒对海底地形的影响程度，探讨了影响倾倒区海底地形变化的因素。研究表明，短期内倾倒活动对倾倒区及周边海域的海底地形淤高起到了一定的作用，但该海域水动力条件较好，长期来看，海底地形的变化趋近于自然状态下的演变。

Effects of dredged materials dumping operations on submarine topography of Shengsi Shangchuanshan dumping site and surrounding sea

Shengsi Shangchuanshan ocean dumping site was put into service since November 2010, and it received approximately 41.084 million cubic meters dredged materials and provided support for the construction of Yangshan deep-water port. This study aims to illustrate the variation of submarine topography of dumping site and surrounding sea, investigate the effects of dredged materials dumping and discuss the influence factors leading to topographic change. To achieve this aim, the marine topography monitoring data from 2015 to 2017 was used to analyze the topographic erosion and siltation of dumping site and surrounding sea. The results showed that dumping dredged materials had contributed to a certain extent but short-term silting-up in the dumping site and surrounding sea. However, from a long-term perspective, the submarine topography tended dominated by natural process.