口外水下三角洲及杭州湾是长江来沙的主要淤积地，过大通断面的泥沙约有70％左右进入此区域沉积。

Coming sediment mainly deposit in the submerged delta and Hangzhou Bay, and there is about 70% of sediment that go through Datong section into this region.

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根据GIS、数据库系统的原理，设计实现了河道与库区泥沙淤积系统的数据模型、功能模块和主体结构，成功地将基础数据库进行了入库操作。

Based on the principle of GIS and database system, data model, function modules and agent structure of sediment silting system of watercourse and reservoir zone is designed.

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数值计算结果表明，该模型在定性上能正确地模拟水流以及河床的冲刷、淤积过程。

The result shows that the flow field and the process of riverbed erosion and deposition can be simulated qualitatively by this method.

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