不同时间尺度下运城盆地地下水水位对降水变化响应特征

Characteristics of groundwater systems in the Yuncheng Basin in response to climate change

运城地下水流场演变具有明显时间尺度效应。在天尺度下,地下水水位在2~3月,由于大量开采开始急剧下降,下降速率为“cm/d级”,在6~9月降水入渗补给的作用下大幅回升,回升速率亦为“cm/d级”;在月尺度下,雨季之前随着地下水量持续开采,水位持续下降,雨季之后,地下水得到补给,地下水水位上升,全年低水位一般出现在5~8月,高水位出现在10月以后;年尺度下,年降水量每增加100 mm,地下水水位变幅减缓0.45 m,平衡点为580 mm左右。

The statistical downscaling method was used to estimate the response of groundwater levels to climate change at different time scales in the Yuncheng basin.The results of the study are as follows:on a daily scale,the groundwater level starts to drop sharply in February and March due to heavy mining,and then regains significantly in the rainy season due to infiltration and recharge of precipitation;on a monthly scale,the water level varies greatly within the year and is significantly influenced by mining;on an annual scale,the variation of groundwater level is mainly influenced by precipitation.