石佛寺水库周边地下水生态水位研究

Study on Groundwater Ecological Level Around Shifosi Reservoir

鉴于地下水生态水位埋深确定的重要性,通过室内土柱蒸发试验、毛细上升高度试验进行分析计算,确定极限蒸发深度与毛细上升高度,从而确定石佛寺水库不同功能区地下水生态水位埋深上、下限。结果表明,粉质砂土区、粘土区极限蒸发深度分别为4.1、4.0m;水库及周边地区毛细水上升高度约为1.5m;库区内各植物生长最适宜地下水位埋深为2.0m,附近农田区水稻高产的最适宜地下水位埋深为1.8m。因此,为均衡合理地利用地下水资源,避免产生生态负效应,应将石佛寺水库漫滩区地下水生态水位埋深控制在2.0~4.1m之间,湿地区生态水位埋深控制在2.0~4.0m之间,附近农田区生态水位埋深控制在1.8~4.0m之间。

In view of the importance of determining the depth of groundwater ecological water level, indoor soil column evaporation test and capillary rise height test were used to analyze and determine the ultimate evaporation depth and capillary rise height. Thus, the upper and lower limit of groundwater ecological water level in different functional areas of Shifosi Reservoir were obtained. The results show that the limit evaporation depths in the silty and clay zones are 4.1 and 4.0 m, respectively; The capillary water rise height around the Shifosi Reservoir is about 1.5 m; The optimum depth of plant growth in the reservoir area is 2.0 m, and the optimum depth of paddy yield in farmland near the reservoir is 1.8 m. Therefore, in order to balance and make rational use of groundwater resources and avoid ecological negative effects, the ecological groundwater level of floodplain sandstone area and wetland clay area water level in the reservoir area should be controlled in the range of 2 m and 4 m, and farmland clay area ecological groundwater level should be controlled from 1.8 m to 4.0 m.