感潮河段潮流量测验测次分布对潮量计算精度的影响

针对长江下游苏通大桥桥位河段的水文地质特性,对涨落潮分别采用3种潮流量测验测次分布方案,研究潮流量测次分布对潮量计算精度的影响。以连续实测潮流速资料推算的涨落潮量作为真值,将各不同测次方案下推算出的涨落潮量与之比较,进行误差分析。结果表明：潮量计算精度随着测次的增加而提高;目前感潮河段采用落潮流1 h施测1次的常规测次方案较为合理;涨潮流0.5 h施测1次会导致涨潮量系统误差偏小,净泄量比实际值偏大,继而影响桥位河段潮量计算精度和水资源量的控制,需要进行误差校正。

Influence of tidal discharge measurement time distribution on tidal discharge measurement precision in tidal river reaches

According to the hydrogeologic properties of the Sutong Bridge location reach of the lower Yangtze River,three types of measurement time distribution were used to analyze the influence of measurement time distribution on tidal discharge measurement precision for flood and ebb tides.Flood and ebb tidal discharge calculated by continuously observed velocity data were selected as the true value and compared with the discharge calculated based on different measurement time distributions.The results show that the tidal discharge measurement precision improved with the addition of measurement times.The commonly used measurement scheme in which the discharge is measured once an hour during ebb tide is more reasonable.Discharge measured every half an hour during flood tide may lead to systematic error.Flood tidal volume is smaller and the sum of tidal volume is larger than the true value,which affects the tidal discharge measurement precision and the control of the water resources quantity.It is necessary to correct the systematic error.