强潮河口排涝闸下游双丁坝防冲减淤措施研究

Research on the Measures of Anti - scour and silt relief by Using Double "T"-Shape Dams in the Downstream of Surface Drainage Sluice at the Outlet of Strong Tide River

在综合分析钱塘江河口北岸水流泥沙运动特性的基础上,提出在强潮河口排涝闸下游利用双丁坝进行防冲减淤的方案,并利用水流数学模型模拟分析了不同布置方案工程前后水流特性、闸下游水流流态、丁坝间流速变化、排水出流与附近边滩水流相互作用情况,推断出丁坝附近的冲淤情况,从而为闸下游选择合适的河宽（丁坝间距）和丁坝长度提供依据。

On the basis of comprehensive analysis of the silt movement characteristics in the northern bank water flow at the outlet of Qiantang River, the method of anti-scour and silt relief by using double 'T'-shape dam downstream of the surface drainage sluice at the outlet of the strong-tide river is proposed. The water flow characters, the flow forms downstream of the sluice, flow velocity variations between the double 'T'-Shape dams, the interaction between the drainage and nearby side-bank flow before and after the project for different layouts are also analyzed through water-flow math-ematic model simulation; the scouring and silting conditions near the 'T'-shape dam are also extrapolated; and the selection basis of suitable river width (distance between the double 'T'-shape dams) and the length of the 'T'-shape dam is also provided.