三峡水库水温变化及其对中华鲟繁殖的影响

分析了三峡库区相关水文站建库前后的水温变化规律,利用水库热量平衡方程计算了三峡水库下泄水温的“滞温”和“滞冷”幅度,并对下泄水温变化对坝下中华鲟繁殖的影响进行了研究.结果表明,三峡水库围堰发电期库区近坝段主槽没有出现水温分层现象,下泄水温“滞温”和“滞冷”现象较轻,葛洲坝下10月份水温生态因子演变为中华鲟产卵场繁殖的限制因子.

Water temperature variation in Three-Gorges Reservoir and its influences on procreation of Chinese sturgeons

The variation of water temperature at related hydrological stations in Three-Gorges Reservoir region before and after the dam construction was analyzed.The degree of water temperature lag during water discharge from the Three-Gorges Reservoir was calculated by use of the thermal equilibrium equation of the reservoir,and the influences of water temperature variation in the reservoir on the procreation of Chinese sturgeons were studied.The result shows that the layered water temperature does not occur in the main channel near the dam at the power generation stage with the cofferdam,and the phenomenon of water temperature lag during water discharge from the reservoir is not serious,and that the water temperature-ecological factor of the Gezhouba Reservoir for Oct.becomes an ecological limiting factor to the procreation of Chinese sturgeons.