梯级水库对澜沧江干流水温沿程变化的影响

21世纪以来,澜沧江流域开始兴建水电站,对整个澜沧江的生态环境将产生巨大影响。基于对澜沧江干流云南段进行3次沿程水温观测及水文历史数据,分析了澜沧江水温的沿程变化。采用插值法、数据均一化、显著性差异分析等方法分析了梯级水库对于澜沧江干流水温沿程变化的影响。通过分析发现:①建库前后澜沧江干流的全河段水温与纬度、高程呈明显的线性负相关关系;②从流域层面上来讲,澜沧江梯级水库的建设对澜沧江水温整体沿程变化无显著性影响。研究成果有助于从整个流域层面上认识水温沿程变化,从而对梯级水库建设下的水库群联合调度提供参考。

Influence of Cascade Reservoirs on Water Temperature Change along the Mainstream of Lancang River

The construction of hydropower stations in the Lancang River basin since the 21st century will bring about far-reaching influence on the ecological environment in the basin. In this paper the impact of cascade reservoirs on water temperature along the Lancang River was examined via interpolation method, data homogenization and significant difference analysis according to the results of three observations on water temperature and historical hydrological data in the Yunnan segment of the Lancang River. Research results imply that: (1) the water temperature along the Lancang River before and after the construction rises linearly with the decline of latitude and altitude; (2) in a holistic sense of the entire basin, the construction of cascade reservoirs has no significant impact on the water temperature change along the river. The research findings offer reference for the joint dispatching of cascade reservoir groups by providing holistic understanding of water temperature change in the whole basin.