关键词: 河床冲刷, 冲刷深度, 水工模型试验, 护底工程, 摩擦系数

Abstract: For the river bed erosion protection at downstream of the water gate, physical model tests are generally required to verify the protection and treatment schemes before implementation. Through the simulation of typical operating conditions of a power station, the scouring process of the scouring area was inverted, the maximum scouring depth and range were determined, and then six bottom protection schemes were put forward. In this paper, the scouring resistant effects of different schemes were compared through 1:70 hydraulic model test. The results showed that laying two rows concrete slabs of 3.0 m thick, 9.0 m length and 9.0 m width on the left side river bed along the left guide wall of the open channel had better hydraulic indexes, which not only considered economic benefit but also controlled the scouring range of the river bed. The friction coefficient range between the concrete slab and the riverbed was calculated to be 0.20 to 0.30. The research results can provide scientific basis and experience for the rehabilitation of the riverbed.

Key words: river bed erosion, erosion depth, hydraulic model test, bottom protection project, friction coefficient