Bed Evolution Processes after Falling Works Removal

通过实验研究了落水工程部分拆除后上下游的河床演化过程。建立了基于二维非结构化网格的床层演化数值模拟模型，并将其应用于实验和现场数据集。平衡床层构型及其发展过程受结构初始设置、移出形状和床层物质分布等参数的影响。结果表明，在实际河流中，复杂的三维流动特性和泥沙运动及其分选是应用的关键问题。

Bed evolution processes in both the upstream and downstream of a falling works after its partial removal were investigated experimentally. Numerical simulation model for bed evolution with a 2-D unstructured mesh was also developed and applied to the datasets obtained in the experiments and the field. Equilibrium bed configurations and their developing processes are influenced by several parameters such as initial setup of the structure, its removal shape and bed material distributions. The results indicate that complex 3-D flow behavior and resultant sediment motions including their sorting induced after the removal are the crucial issues for application to real rivers.