生态补水下的永定河流域地下水水位变化规律

Variation Regularity of Groundwater Level in the Yongding River Basin Under Ecological Replenishment

2020年春季永定河流域(北京段)生态补水工作于4月20日正式开启。为了解在生态补水影响下的永定河流域北京段及北京段周边地区地下水水位变化规律,依据收集的2020年春季补水开展后的半年内地下水水位观测数据,以聚类方式进行归类,再对每类变化规律分别进行分析。结果表明,在生态补水影响下的永定河流域研究区域地下水水位动态变化类型可划分为持续下降型、先下降后上升型和持续平缓型,其中北京段、天津段和部分河北段地下水水位呈先下降后上升的变化趋势,而且存在明显的滞后性。另一部分河北段和山西段呈持续平缓型,仅有少数位点呈持续下降型。这些规律可为制定科学的生态补水方案提供技术参考。

In the spring of 2020,the ecological water replenishment in Yongding River Basin(Beijing section)was officially started on the 20th of April.To understand the variation regularity of groundwater level in the Beijing section of the Yongding River basin and the surrounding areas under the influence of ecological water replenishment,based on the observation data of groundwater level within six months after the spring water replenishment in 2020,the data were classified by clustering method.Subsequently,each type of variation regularity was analyzed separately.The results show that the dynamic change types of groundwater level in Yongding River Basin under the ecological water replenishment influence can be divided into(1)continuous decline type,(2)decline type and then increase,and(3)continuous constant type,among which the groundwater level in the Beijing section,Tianjin section,and part of Hebei section shows type 2,and there is an obvious lag.However,the other parts of the Hebei section and Shanxi section show type 3,and only a few sites show type 1.These regularities can provide a technical reference for making scientific ecological water replenishment scheme.