TES-71泥沙监测系统在高州水文站的率定分析

Calibration analysis of TES-71 sand monitoring systemat Gaozhou hydrological station

河流悬移质泥沙含沙量是重要的水文参数,含沙量的实时监测是水文监测的薄弱环节。为提升水文测报的智能化、自动化水平,茂名水文分局引进TES-71泥沙监测仪。实测数据分析发现含沙量0.167kg/m^(3)为关系曲线的分界点。对数据进行分段率定,高含沙量时泥沙监测仪显示值与实测含沙量具有良好的相关关系,随机不确定度为17.4%,系统误差为-1.2%,满足二类精度水文站单一线法的定线精度,TES-71泥沙监测仪适用于高州水文站泥沙的高沙监测。低含沙量时段的输沙量占年输沙量的比重平均值为22.3%;虽然未满足规范要求但关系较为清晰,通过低含沙量时段关系线反推输沙量,数据平均相对误差为±5%以内;总体误差较小,有继续比测的价值。

The suspended sand content in rivers is an important hydrological parameter and its real-time monitoring is a weak link in hydrological monitoring.In order to improve the intelligent and automatic level of hydrological forcasting,Maoming hydrological branch introduced the sand content monitor named TES-71.After analyzing the collected data,it shows that the measured sand content of 0.167kg/m^(3) is the dividing point of the relationship curve.By segmenting and calibrating the data,the displayed value of TES-71 monitor has a good correlation with the measured sand content under high sand content.The random uncertainty is 17.4%,and the system error is-1.2%,meeting the alignment accuracy of the single line method for the hydrological stations with class II precision.Therefore,the TES-71 monitor is suitable for monitoring high sand content at Gaozhou hydrological station.The relationship between low sand content and annual sand content discharge is relatively poor.The random uncertainty is 81.0%,and the system error is 18.7%,which does not meet the alignment accuracy of the single line method for hydrological stations with class II precision.The average proportion of sediment discharge during the period of low sand content to annual sediment discharge is 22.3%;The sediment discharge is inversely estimated through the relationship line during the period of low sand content,and the average relative error of the data is within±5%,whose overall error is small.Although it does not meet the specified requirements,it shows a relatively clear relationship,so it is valuable for continuous comparison and measurement.