Abstract: Groynes can be permeable and impermeable. To explore the influence of groyne on nearby flow under different working conditions, laboratory experiment, in which the groyne in the glass flume was scoured by clean water, was carried out. Combined with numerical model, complex local flow field and riverbed deformation were simulated. Results showed that impermeable groyne had greater separation angle, maximum scouring depth and scouring area than permeable groyne. This paper describes the morphological changes of riverbed with different types of groynes, which has reference value for groynes design and protection of river dikes.

Key words: local flow, riverbed deformation, clean water scouring, impermeable groyne, permeable groyne

摘要： 丁坝主要分为两种类型：不透水型和透水型。为了探究不同工况下丁坝对附近水流结构的影响，通过清水冲刷倾斜玻璃水槽上的丁坝进行室内试验，并结合数值模型模拟复杂的局部流场和河床变形过程。研究结果表明：不透水丁坝的分离角、最大冲刷深度、冲刷面积均大于透水丁坝。笔者描述了不同类型丁坝河床的形态变化，这对设计丁坝、保护河道堤防安全有一定的参考价值。

关键词: 局部流动, 河床变形, 清水冲刷, 不透水丁坝, 透水丁坝