深槽护底带对水位的影响

Influence of deep trench bottom protection belt on water level

针对深槽护底带布置参数确定缺乏理论依据的问题,采用大区域半江正态模型对七星台深槽护底带不同护底参数下水位影响进行研究,得到七星台深槽护底带平面最优间距为300~330 m的结论。提出了条形护底带壅水规律,可为类似深槽护底带间距的确定提供依据。通过护底带对水位下降溯源传递的影响研究,揭示了护底主要通过两方面作用达到维持河段水位稳定的目的:1)塑造河床凸起,增加河床形态阻力,影响水位下降的溯源传递特性;2)抑制河床冲刷下切。

In view of the lack of theoretical basis for determining the layout parameters of the deep trench bottom protection belt,a large area semi-river normal model is used to study the influence on water level under different bottom protection parameters of the Qixingtai deep trench bottom protection belt,and the conclusion that the optimal plane spacing of the Qixingtai deep trench bottom protection belt is 300~330 m is obtained.The backwater law of strip-shaped bottom protection belt is put forward,which can provide the basis for the determination of similar deep trench bottom protection belt spacing.Through the research on the influence of the bottom protection belt on the traceability of water level decline,it is revealed that the bottom protection mainly aims to maintain the water level stability of the river section through two aspects:1)shaping the riverbed bulge to increase the riverbed shape resistance and affecting traceability transmission characteristics of water level decline;2)restraining the riverbed scouring and undercutting.