Wu Dong-jie, Wang Jin-sheng, Ding Ai-zhong
Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Water Sciences, Beijing Normal University, Beijing 100875, China.
Huan Jing Ke Xue. 2007 May;28(5):1075-81.
For studying impacts of lake lining on soil moisture and groundwater recharge intensity, the scenarios analysis method was adopted, with bydrogeological concept modeling and 1D- and 2D-flow modeling for variably saturated porous media, to simulate and predict the variations of soil water content and groundwater recharge intensity before and after lake lining. Through a case of the Yuanmingyuan Ruins Park, the study was performed on the basis of in situ and laboratory experiments. The results showed that, during the low-water-level season, the distributions of soil moisture before and after the lake lining will be basically consistent with each other, and therefore, the lake lining will have little impacts on the soil moisture and groundwater recharge intensity. However, during the high-water-level season with 1 m depth of lake water, the modeling results showed that the groundwater table will rise quickly to the bottom of lake bed with a recharge rate of 18.0 mm/d, and the maximum impact width of the lake on the water content in vegetated zone will be up to 118 m. While after the lake lining, the groundwater recharge rate, and the impact width will decrease to 5.8 mm/d, and 14 m respectively. The vadose zone under the bottom of lake bed will be still unsaturated. Therefore, during high-water-level season, the lake lining will largely decrease the lake leakage, and also greatly reduce the soil moisture in large area.
为研究湖泊衬砌对土壤水分和地下水补给强度的影响，采用情景分析方法，结合水文地质概念模型以及可变饱和多孔介质的一维和二维水流模型，来模拟和预测湖泊衬砌前后土壤含水量和地下水补给强度的变化。通过圆明园遗址公园的案例，基于现场和实验室实验开展了研究。结果表明，在低水位季节，湖泊衬砌前后土壤水分分布基本一致，因此，湖泊衬砌对土壤水分和地下水补给强度影响较小。然而，在湖水深度为1米的高水位季节，模拟结果显示地下水位将迅速上升至湖床底部，补给速率为18.0毫米/天，湖泊对植被区含水量的最大影响宽度将达118米。而在湖泊衬砌后，地下水补给速率和影响宽度将分别降至5.8毫米/天和14米。湖床底部以下的包气带仍将保持不饱和状态。因此，在高水位季节，湖泊衬砌将大幅减少湖泊渗漏，也会极大降低大面积区域的土壤水分。
