水库电站下泄流量与下游河道水质相关性分析研究

Analysis and Research on the Correlation between Reservoir Hydropower Station Discharge Flow and Downstream River Water Quality

为研究水库电站下泄流量与下游河道水质的相关性,以浉河信阳市区段为研究对象,分别选择距离南湾水库电站3.6 km与14.9 km的2个水质监测断面,收集其2020年1月1日—2021年5月20日的逐日水质监测数据与该时段南湾水库电站的下泄流量数据,通过对数拟合建立回归模型,对水库电站下泄流量与下游河道水质指标质量浓度的相关性进行分析。分析结果表明:水库电站下游河道水质指标COD、BOD_(5)、NH_(3-)N和TP的质量浓度与南湾水库电站下泄流量均具有较强的相关性,随着下泄流量增加,各指标的质量浓度值均呈下降趋势;要维持下游监测断面Ⅲ类水的标准,南湾水库下泄流量需达到10 m^(3)/s。该结果可为浉河的水质调控提供科学依据。

This paper analyzes the correlation between the discharge flow of the reservoir hydropower station and the water quality of the downstream river channel,and establishes the corresponding regression analysis model.Taking the Xinyang urban section of Shihe River as the research object,this paper selects two water quality monitoring stations 3.6 km and 14.9 km away from Nanwan Hydropower Station respectively,collects the daily water quality monitoring data of the monitoring section from January 1,2020 to May 20,2021 and the discharge flow data of Nanwan Hydropower Station during this period,establishes a regression model through logarithmic fitting,and analyzes the correlation between the discharge flow of the reservoir power station and the downstream river water quality.The analysis results show that the concentrations of COD,BOD_(5),NH_(3-)N and TP,the downstream river water quality indicators of the reservoir power station,have a strong correlation with the discharge flow of Nanwan Hydropower Station.With the increase of the discharge flow,the water quality concentration values show a downward trend.To maintain the Class III water standard of the downstream monitoring station,the discharge flow of Nanwan reservoir needs to reach 10 m^(3)/s.The results can provide scientific basis for the regulation of water quality in Shihe River.