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分析了海岸工程规划中传统的水下地形冲淤计算方法的不足，介绍了地理信息系统（ＧＩＳ）的基本组成及其在水下地形冲淤计算中的应用实例．在浙江舟山渔港港域地形冲淤变化分析中，利用ＧＩＳ工具软件ＡＲＣ／ＩＮＦＯ分别建立了该水域１９６２年、１９８７年和１９９６年三个不同时期的数字高程模型（ＤＥＭ），计算了１９６２～１９８７年和１９８７～１９９６年两个时段的冲淤深度与相应的冲淤面积和冲淤量，为建港环境条件分析提供了依据．
This paper analyzes the shortage of the traditional method of calculating the erosion and deposition of underwater terrain in coastal engineering planning and introduces the basic composition of GIS and its application in the calculation of erosion and siltation in underwater terrain. In the analysis of the variation of the terrain scouring and silting in the Zhoushan fishing port in Zhejiang Province, the digital elevation model (DEM) of the waters in three different periods of 1962, 1987 and 1996 was established respectively using GIS tool ARC / INFO. The scouring and depositional depth, the corresponding scouring and silting area and the scouring and silting amounts in two years from 1987 to 1996 and years provide the basis for the analysis of the environmental conditions of the port.