中文摘要：

基于金沙江干流巴塘、石鼓、华弹3个水文站的50年来水温监测数据,利用线性回归和小波分析的方法,探讨了金沙江干流的水温变化特征,辨识了气候变化和水电工程对水温变化的影响。金沙江干流水温沿程逐渐递增,并呈现出多时间尺度的周期性变化,除年变化外,还存在4-6年、10-12年的变化周期。气候变化对金沙江水温的影响主要体现在年均水温的变化：近50年来,3个测站的年均水温逐渐增加,变化率约0.006 3-0.017 0℃/年。支流水电开发对华弹站水温的影响主要体现在年内的水温变化,升温期水温比建坝前有所降低,4月份降幅最大,达0.8℃;降温期水温比建坝前有所升高,12月份升幅最大,达1.8℃。

英文摘要：

To distinct the impacts of climate changes and dam constructions on water temperature,changes of water temperature in the Jinsha River mainstream over the past 50 years are studied based on the temperatures daily observed at Batang,Shigu and Huatan hydrological stations,using the methods of regression analysis and wavelet analysis. The results show that the water temperature in the Jinsha River mainstream increased downstream along the river and changed at different scales of 1-year,4-to 6-year and 10-to 12-year. The average annual water temperatures at the selected three stations increased at the rate of 0. 0063-0. 0170 ℃ / year,which is regarded as the contribution of climate changes.However,dam constructions on a branch exerted an obvious impact on the monthly variation in water temperature at the Huatan station. During the warming periods,the temperatures became lower than that before the dam constructions and the reduction magnitude reached the maximum by as much as 0. 8 ℃ in April. During the cooling periods,the temperatures were higher than that before the dam constructions and the increase magnitude reached the maximum by as much as 0. 8℃in December.