首页|渠道糙率率定误差分析

渠道糙率率定误差分析

扫码查看
本文研究了渠道糙率率定误差与水力测量误差的函数关系。根据水力学原理,提出了计算渠道糙率率定误差的公式,然后计算分析了南水北调中线京石段应急供水工程实测流量、水深误差产生的渠道糙率率定的误差.得到重要结论:(1)微小的水力测量误差可能产生较大的渠道糙率率定误差,现有南水北调中线典型渠道原型观测糙率误差可达11%;(2)糙率的流量误差分量相对值与流量测量误差基本相同;(3)糙率的进出口水深误差分量绝对值非常接近,两者绝对值大小不仅与水深测量误差成正比,而且与渠道长度有关,当渠道过短时,糙率的水深误差分量将成倍增加。
Error analysis of roughness coefficient calibration for channels
This paper studies the relationships between the error of the channel roughness coefficient cali- bration and that of the hydraulic measurement. According to the principle of hydraulics, the formula of de- termining the error of the channel roughness coefficient calibration is deduced explicitly. Based upon the measured data from the Beijing-Shijiazhuang Emergency Water Supply Project of South-to-North Water Di- version, the error analysis of the roughness coefficient calibration is carried out for the typical channels. Some important conclusions are attained: (1) tiny hydraulic measurement error may result in significant er- ror of the channel roughness coefficient calibration and for the existing typical channel the error can reach 11%; (2) the relative error of the roughness coefficient caused by the volumetric discharge is approximatly equal to the error of flow meter; (3) if the measurement errors of the water depths are the same, the er- ror of the channel roughness coefficient calibration caused by the inlet water depth is very close to that caused by the outlet water depth. When the channel length is short, the error of the channel roughness co- efficient calibration will increase significantly.

channelroughness coefficientcalibrationerror analysis

杨开林、汪易森

展开 >

中国水利水电科学研究院流域水循环模拟与调控国家重点实验室,北京100038

国务院南水北调工程建设委员会,北京100038

渠道 糙率 率定 误差

国务院南水北调工程建设委员会专家委员会重点专项基金资助

JGZXSY2009-11

2012

水利学报
中国水利学会

水利学报

CSTPCDCSCD北大核心EI
影响因子:1.778
ISSN:0559-9350
年,卷(期):2012.43(6)
  • 19
  • 4