钱塘江河口沙坎演变的数值模拟研究  

Numerical Modeling of the Sandbar Evolution in Qiantang Estuary

作　　者：陈韬霄[1,2] 谢东风[1] 诸裕良[2] 

机构地区：[1]浙江省水利河口研究院,浙江杭州310020 [2]河海大学,江苏南京210098

出　　处：《浙江水利科技》2013年第5期1-4,共4页Zhejiang Hydrotechnics

基　　金：国家自然科学基金资助项目(41006053);水利部公益性行业科研专项(1261410110020)

摘　　要：运用Delft3D软件模拟钱塘江河口沙坎的形成演变过程,探讨钱塘江河口沙坎的演变机理。将钱塘江河口概化为喇叭形,假定底质泥沙粒径单一,不考虑波浪作用,在径流和潮汐的作用下,建立钱塘江河口沙坎演变的数值模拟,重现沙坎演变的过程。钱塘江河口沙坎的形成演变主要受水动力、泥沙输运、河床演变三者非线性相互作用的控制。流域来水与外海潮汐的相互作用为沙坎提供了水动力条件,外海巨量泥沙输入为沙坎形成提供了丰富的泥沙来源。The formation and evolution process of the large sandbar in Qiantang estuary, China was simulated using Delft3D. The Qiantang Estuary was schematized to be a straight funnel-shaped estuary, floored with uniform sediment. The model was forced by tides at the downstream and river discharge at the upstream. The evolution of the sandbar was mainly controlled by the nonlinear interaction among hydrodynamics, sediment transport and bed evolution. The interaction between the flood and tide provided the hydrodynmnic condition for the reproduction of the sandbar. The sediment input from the open sea was the essential material source for the sandbar formation.

关 键 词：沙坎 河床演变 数值模拟 钱塘江河口 

分 类 号：TV142[水利工程—水力学及河流动力学]