金塘大浦口集装箱码头前沿海域冲淤分析

Analysis of Erosion and Deposition in the Apron of Jintang Dapukou Container Terminals

利用金塘港区大浦口集装箱码头前沿海域1935年、1962年、1987年、2004年的水深地形资料和舟山甬舟集装箱码头有限公司提供的2011年2月、3月和4月的测深资料,应用GIS技术,建立了该海域的数字高程模型,计算探讨了集装箱码头建造前后码头前沿海域的冲淤变化。结果表明,在码头建造前的1935-2004年间,该海域经历了从较快冲刷到轻微淤积再到较快淤积的调整过程,而码头建造后,码头前沿海域则继续趋于淤积,且淤积强度有所增大,年均淤积速率达到1.15 m/a。这种冲淤趋势与金塘水道的冲淤变化密切相关,其根本原因可能与上游杭州湾南岸的围海造地有关。而集装箱码头桩基的阻水作用在一定时间内对码头前沿海域的淤积也有一定的贡献。

Utilization of charts of 1935, 1962, 1987, 2004 in the wharf apron of Jintang Dapukou and the batwmetric data in February, March and April of 2011 provided by Zhoushan Yongzhou Container Terminals Co., Ltd, GIS technology is applied to set up the digital elevation models of the sea area. With the models, the variation of erosion and deposition in the apron of container terminals before and after construction is calculat- ed and discussed. The results indicate that the region experiences an adjustment process, from fast erosion to slight deposition, and to fast deposition during the period of 1935 to 2004 before construction. While there is an increase in deposition at an annual average rate of 1.15 m/a in this region after construction. The change is closely related to erosion-deposition variation of Jintang channel, to which the basic reason is possibly associ- ated with reclamation in south coast of Hangzhou bay. Furthermore, pile resistance effects will do contribution to sediment deposition in the wharf apron for some