金沙江下游宜宾段气象因子和水温相关关系研究

Correlation between meteorological factors and water temperature in Yibin section of lower Jinsha River under influence of human activities

为研究人类活动影响下气象因子和水温的相关关系,以金沙江下游宜宾段为例,统计分析了向家坝建坝前后主要气象因子和宜宾段平均水温的数据特征,分别使用Pearson简单相关分析和偏相关分析法,研究了向家坝建坝前后宜宾段平均水温与主要气象因子的相关关系及变化,并利用双因素方差分析探索了这种变化的主要原因。研究结果显示:平均气温是影响宜宾段平均水温的主要气象因子,日照时数、平均相对湿度、最大风速非主要影响因子,降水量变化对平均水温无明显影响。受气温变化和金沙江梯级开发的共同影响,宜宾段平均气温与水温的相关关系会发生一定改变。

In order to study the correlation between meteorological factors and water temperature under the influence of human activities,taking Yibin section of the lower Jinsha River as an example,the data characteristics of the main meteorological factors and the average water temperature of the section before and after water impounding of Xiangjiaba Hydropower station were analyzed,and the correlation and change between the average water temperature and the main meteorological factors before and after the construction were studied by Pearson correlation analysis and partial correlation analysis,finally,the main cause of this change was explored by two factors analysis of variance.The results showed that,the average temperature was the main meteorological factor affecting the average water temperature in Yibin section,while sunshine hours,average relative humidity and maximum wind speed were not the main influencing factors and the precipitation change had no obvious influence on the average water temperature.Due to the joint influence of temperature change and cascade development of the Jinsha River,the correlation between average temperature and water temperature in Yibin section had changed to some extent.