Groundwater-surface water interactions derived by hydrochemical and isotopic (Rn-222 deuterium, oxygen-18) tracers in the Nomhon area, Qaidam Basin, NW China
Groundwater-surface water interactions derived by hydrochemical and isotopic (Rn-222 deuterium, oxygen-18) tracers in the Nomhon area, Qaidam Basin, NW China
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中国西北柴达木盆地诺木洪地区水化学和同位素（222Rn、氘、氧-18）示踪剂得出的地下水-地表水相互作用
DOI：
10.1016/j.jhydrol.2018.08.066
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发表时间：
2018
影响因子：
6.4
通讯作者：
Shi Zheming
中科院分区：
文献类型：
--
作者：
Zhao Dan;Wang Guangcai;Liao Fu;Yang Nuan;Jiang Wanjun;Guo Liang;Liu Chenglong;Shi Zheming
了解地下水与地表水之间的相互作用对于干旱和半干旱地区水资源的可持续管理具有重要意义。本研究采用多种环境示踪剂（水化学参数、稳定氢氧同位素和放射性222Rn）研究了中国西北干旱柴达木盆地东南部诺姆洪地区两条河流（天格里河和诺姆洪河）地下水与地表水的相互作用。观察到该地区水体222Rn浓度存在明显差异，降序为地下水>泉水>河流。天格里河沿线地下水、泉水和河水222Rn浓度分别约为12,120~17,407、3013~15,819和809~8205Bq/m3。这条河的特点是河水222Rn浓度高，经调查主要由泉水和地下水排放补给。沿Nomhon河，地下水和河水222Rn浓度分别约为6772-60,369和14-519Bq/m3。河流上游 222Rn 浓度的平均背景测定为约 43Bq/m3。中游出现沿河222Rn高浓度区，峰值为519Bq/m3，距离约10km，表明冲积平原地下水排入诺洪河。建立了A222Rn质量平衡模型来估算流入河流的地下水流量，显示采样期间Nomhon河中游的最大地下水流量为0.37m3/s。两条河流的稳定同位素组成（δD和δ18O）和水化学特征（水化学类型、TDS和EC）呈现出相应的变化，这也为诺姆洪地区地下水与地表水相互作用提供了证据。
Understanding the interaction between groundwater and surface water is of vital significance for the sustainable management of water resources in arid and semi-arid areas. In this study, multi environmental tracers (hydrochemical parameters, stable hydrogen and oxygen isotopes and radioactive222Rn) were employed to investigate the interaction between groundwater and surface water along two rivers (Tiangeli River and Nomhon River) in the Nomhon area, southeast of the arid Qaidam Basin, northwest China. Here we observed that the222Rn concentration of waters were distinctly different with a decrease order of groundwater > spring > river in this area. Along the Tiangeli River, the222Rn concentrations of groundwater, springs and river water were about 12,120–17,407, 3013–15,819 and 809–8205 Bq/m3, respectively. This river was characterized by the high222Rn concentration of the river water and was investigated to be mainly fed by springs and groundwater discharge. Along the Nomhon river,222Rn concentration of groundwater and river water was about 6772–60,369 and 14–519 Bq/m3, respectively. An average background of the222Rn concentration in the upstream of the river was determined to be about 43 Bq/m3. A high222Rn concentration zone along the river appeared in the midstream, with a peak value of 519 Bq/m3and a distance about 10 km, indicating that groundwater discharged to the Nomhon River in the alluvial plain. A222Rn mass-balance model was constructed to estimate the groundwater discharge into the river, showing a maximum groundwater discharge of 0.37 m3/s in the midstream of Nomhon River during the sampling period. The stable isotopic compositions (δD and δ18O) and hydrochemical characteristics (hydrochemical type, TDS and EC) showed corresponding changes along these two rivers, which also provided evidences for the groundwater-surface water interactions in the Nomhon area.