平原型水库水位变化对库区附近地下水位影响的滞后性研究

水库水位变化对库岸地下水位的变化有直接影响,但库岸地下水位的上升或下降需要较长时间,也就是说地下水位的变化会存在一定的滞后性。结合江巷水库的浸没问题,运用Modflow软件建立地下水流的三维数值模型,将水库水位概化为阶梯型周期性变化,预测地下水位的变化规律。结果表明,库岸地下水位变化的滞后性主要与距离、渗透系数、给水度等因素有关,而降水蒸发对地下水位的滞后性影响很小。

Study on Hysteresis of Groundwater Level Near Reservoir Caused by Change of Water Level in Plain Reservoir

The change of reservoir water level has a direct impact on the change of groundwater level in the reservoir bank. However, it takes a long time for the groundwater level of the reservoir bank to rise or fall, which means that there will be some hysteresis in the change of groundwater level. Based on the immersion problem of Jiangxiang Reservoir, this paper uses Modflow software to establish a three-dimensional numerical model of groundwater flow and generalizes the reservoir water level into a stepwise periodic change to predict the change law of groundwater level. The results show that the hysteresis of the change of groundwater level in the reservoir bank is mainly related to the distance, permeability coefficient and water supply, while precipitation and evaporation have little influence on the hysteresis of the groundwater level