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为了分析密云水库近10年来水温分布规律,尤其是1999年以来入流减少对于水温结构的影响,该文在CE-QUAL-R1模型的基础上建立了适用于密云水库的垂向一维水温模型。利用1991和2006年的实测数据对模型进行参数率定和验证,进而模拟1998—2007年水库水温的时空分布。结果表明:在来流减少、水位大幅下降的情况下,密云水库的水温分层现象仍然存在,分层从春夏之交持续到秋季,最大温差超过10℃;当有较大的流量入库时,水库将出现双斜分层的水温结构;随着水位的下降,表层水温变化很小、中层水温上升幅度较大、底层水温上升幅度较小;取水口出流水温随着水位的下降而升高,高水位时最大值出现在秋季,低水位时最大值出现在夏季。
In order to analyze the distribution of water temperature in Miyun Reservoir in recent 10 years, especially the influence of inflow reduction on water temperature structure since 1999, a vertical one-dimensional water temperature model suitable for Miyun Reservoir was established based on CE-QUAL-R1 model. Using the measured data from 1991 and 2006, the model was calibrated and validated. Then the spatio-temporal distribution of reservoir water temperature was simulated from 1998 to 2007. The results show that the stratification of water temperature in Miyun Reservoir still exists when the incoming flow decreases and the water level drops drastically. The stratification lags from the beginning of spring to summer and the maximum temperature difference exceeds 10 ℃. When larger flow storage When the water level drops, the water temperature in the surface layer changes little. The water temperature in the middle layer rises a lot and the water temperature in the bottom layer rises less. The outlet temperature of water outlet decreases with the decrease of water level The maximum appeared in the autumn when the water level was high and the maximum appeared in the summer when the water level was low.