中文摘要：

以小米滩丁坝为例,通过实地调研,并运用计算流体力学软件FLUENT对该坝周围的水流流场进行模拟分析,探求水毁原因。结果表明：长江上游丁坝坝根出现水毁现象的可能原因是河道地形对水流产生挑流作用从而影响坝根处流速,并提出丁坝选址时尽量避免水流冲刷区,采取坝根加固、将坝根嵌入岸坡等相应的坝根保护措施。

英文摘要：

Taking Xiaomi beach as a study case, we carry out the site investigation and simulate the fluid flow by the software CFD （ FLUENT 6. 3. 26） to seek the reasons for the washout of the dike root. The result shows that the damage causes of the spur dike＇s root in the upper reaches of the Yangtze River may be the influence of river terrain＇s deflecting flow on the velocity of the dike root. We thus propose the protection measures including siting the spur dike as far to the flow erosion area as possible, reinforcing the dike root or embedding the root into the bank slope, etc.