基于ADCP实时指标流速的感潮段断面流量计算

Study on sectional flow calculation in tidal reach by ADCP real-time index velocity

长江下游感潮河段水位-流量关系曲线无法确定。针对传统测流方式存在的监测频次偏少、无法实现流量过程推求等问题,建立了ADCP在线测流系统。根据一段时期内在线测流系统中ADCP实时指标流速监测值与断面平均流速实测值,建立了两者间的多元线性回归模型,并进行求解,获得了模型的回归系数。以南京水文实验站2010年11月至2011年12月之间的监测资料为例,通过以上方法计算实时指标流速的回归系数,并结合水位和河底高程求得过水断面流量。与实测流量对比表明,该模型具有较好的拟合效果,计算精度较高,可广泛地应用于流量的实时报汛及整编。

The stage-discharge relation curve of the tidal reach of Yangtze River could not be determined directly. The traditional method is insufficient as its monitoring frequency is too low to calculate the discharge,so an on-line flow measurement system of ADCP is established to solve the above problems. A multiple-element linear regression model between the ADCP real-time index velocities and the mean velocity at a cross-section is built up and solved,so the regression coefficients are obtained. According to the correspondent data at Nanjing hydrologic experiment station from November,2010 to December,2011,the regression coefficients of the index velocities were obtained through the above method and the discharge was calculated by combining with the water level and the river bed elevations. The comparison with the monitoring discharge shows that the presented model has a better fitting effect and higher computational accuracy,which could be widely applied to the real-time telemetry and processing of the discharge.