基于检查井液位测量的暗管测流方法

针对城市排水暗管流量在线监测困难的问题,提出依据城市排水系统雨洪过程的数值模拟结果,以检查井液位为表征量的测流方法。在模型及曲线率定可靠的基础上,可建立特定地块的排水系统监测点液位-流量标准曲线。研究在不同降雨条件、管道特性及地面特性下,检查井液位与监测点流量间的关系,探究曲线的稳定性。结果表明,对于一个特定的地块,排水暗管监测点的液位-流量关系曲线相对稳定,与地块排水管道坡度、曼宁系数等固有特性强相关,降雨条件、地面坡度及类型并不改变液位与流量的对应关系。现场试验表明,在模型率定可靠的基础上,基于暗管检查井液位的测流方法在工程上是可行的。

A measurement method of underground sewers flow based on the liquid level of manhole

Aiming at the difficulty in online monitoring urban drainage pipe flow,a flow measurement method characterized by liquid level based on the numerical simulation results of urban drainage system is proposed.Based on the calibration reliability of the model and curve,the liquid level-flow standard curve of the drainage system monitoring point of a specific plot can be established.The relationship between monitoring liquid level and flow under different inputs such as precipitation,hydraulic parameters of drainpipes and runoff surface hydraulic characteristics was studied to explore the stability of the curve.The results show that the liquid level-flow curve of the monitoring drainage system is relatively stable for a specific region.The rainfall conditions,the slope and type of the ground do not change the corresponding relationship between the liquid level and the flow,but the inherent characteristics such as the slope of the drainage pipe and the manning coefficient are strongly correlated.The actual case study shows that the method of flow measurement based on the liquid level of manhole is feasible in engineering based on the reliability of the model.