新型雨水径流计量用复合堰的设计及率定

Design and calibration of a compound sharp-crested weir for stormwater runoff flow measurement

针对其他流量计量方法不易监测雨水径流流量的问题,提出一种新型复合堰,用于测量雨水径流流量,新设计的堰由下部三角形堰和上部矩形堰复合而成。根据不同重现期下的雨水峰值流量,确定堰的量程和基本尺寸。通过率定试验,得出不同水头下的流量系数以及流量-水头关系曲线。新型复合堰不仅可以精确测量小流量,而且对大流量也可有效测量,具有较高的量程比和较大的泄流能力。

It is difficult to monitor the stormwater runoff flow with other measuring methods.To solve this problem,a new type of compound sharp-crested weir was brought forward,which composed of a lower triangular part and an upper rectangular part.According to the stormwater runoff peak flow under different storm recurrence period,the range and size of weir were determined.Through calibration experiment,the discharge coefficient of different head and the relationship head-flow curve were tested.This weir provided an accurate measurement for a wide range of flows.The new compound sharp-crested weir not only possessed wider measurement range but also huger discharge capacity than the conventional weir.