摘要
以宋家湾水库为例,利用一维水质完全混合模型、水温预测经验公式、库区两岸浸没范围计算方程预测了水库建设对水质、水温及库区两岸地下水位的影响。结果表明:丰水年、平水年、枯水年水库年平均下泄流量16.35、6.68、2.83 m^3/s时,下游河段污染物经水体自净作用均满足水功能区水质标准限值要求;随水深增大库区水温逐渐降低,水温垂向分层强弱差异较大;2-4月份库区水温温差较大,库底水温8.28℃为全年最低水温,与库区表层平均水温相差4.42℃;10月份库底水温与表层平均水温温差较小,库区水温基本稳定,呈水体同温;预测得知水库修建30 a后库区两岸浸润长度为15.27 km,库岸地下水位升高0.0~0.43m,对地下水影响较小。由此可为宋家湾水库水环境影响防治措施的提出及水库合理运行调度提供科学依据。
In this paper,Songjiawan Reservoir is used as an example to evaluate the influence of reservoir construction on water quality,water temperature and groundwater level in both sides of the reservoir area using the one-dimensional water quality complete mixed model,water temperature prediction empirical formula and reservoir area immersion range calculation equation. The results show that when the average annual discharge in wet,flat and dry water year is 16. 35 m3/s,6. 68 m3/s and 2. 83 m3/s,the pollutant self-purification of the downstream river reaches the water quality standard of the water functional area. The water temperature distribution of the reservoir showed a great difference. The deeper the water is,the lower the water temperature is. The water temperature difference between February and April is large,and the lowest water temperature of the year is 8. 28℃,which is 4. 42℃ lower than the average surface water temperature of the reservoir. The water temperature on reservoir bottom is similar to that of the surface in October. The water temperature in the reservoir area is relatively stable and basically the same. It is predicted that the infiltration length of two sides of the reservoir is 15. 27 km 30 years after reservoir construction and the groundwater level is 0. 0 to 0. 43 m higher than before,which shows there is less impact on groundwater. It can provide a scientific basis to prevent and control the effects of water environment and to rationally operate and schedule Songjiawan reservoir.
出处
《水资源与水工程学报》
CSCD
2017年第5期112-116,123,共6页
Journal of Water Resources and Water Engineering
关键词
水环境
水温
水质
地下水位
宋家湾水库
water environment
water temperature
water quality
groundwater level
Songjiawan reservoir
