青海民和甘河流域水力联系及地下水的更新能力识别

Hydraulic connection and groundwater self-renewing of the Gan river basin in Minhe county of Qinghai province

为研究青海省民和县官亭镇甘河流域的水力联系及地下水的更新能力,对甘河流域不同类型的地下水采集样品测试,基于不同水体的水化学特征和δ2H、δ18O同位素特征,采用离子比值法、模糊聚类法和同位素法对甘河流域地下水的水力联系及更新能力进行研究分析。结果表明:大气降水是甘河水和地下水的来源,地下水接受大气降水和甘河水的入渗补给,补给率范围分别为21.2%~27.7%,72.3%~78.8%。各类水体之间除了白家寺附近和文家寺东南侧水力联系较弱之外,其余水体之间的交替程度较快,更新能力强。

In order to examine the hydraulic connection and groundwater self-renewing of the Gan river basin in Minhe county of Qinghai province,different types of groundwater samples are collected from the Gan river basin and tested in this study. Based on the hydrochemical characteristics of different water bodies and the isotope characteristics δ12 H and δ18 O,hydraulic connection and groundwater self-renewing in the Gan river basin are studied by using ion ratio method,fuzzy clustering method and isotope method. The results show that the atmospheric precipitation is the source of Gan river and groundwater. The groundwater is recharged by the infiltration of precipitation and the Gan river,ranging from 21. 2% to 27. 7% and 72. 3% to 78. 8% respectively. Except for the weak hydraulic connection between the water bodies near Baijia temple and the southeast of Wenjia temple,the alternation degree of other water bodies is fast with strong self-renewing.