Spatial and Temporal Isotopic and Hydrochemical Characteristics of Groundwater and Surface Water in the Tuul River Basin, Mongolia
Spatial and Temporal Isotopic and Hydrochemical Characteristics of Groundwater and Surface Water in the Tuul River Basin, Mongolia
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DOI：
10.1007/s41748-022-00305-1
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发表时间：
2022-03
影响因子：
7.2
通讯作者：
Odsuren Batdelger;M. Tsujimura;G. Litton;D. Tran;Byambasuren Zorigt;Hoang Trung Thanh;J. H. Ougahi
中科院分区：
文献类型：
--
作者：
Odsuren Batdelger;M. Tsujimura;G. Litton;D. Tran;Byambasuren Zorigt;Hoang Trung Thanh;J. H. Ougahi
应用水化学和稳定同位素示踪方法研究了地下水和地表沃茨（河流、泉水、雨水排水渠和处理过的废水排放）的时空地球化学和稳定同位素特征及其相互作用。分析揭示了地下水和地表水之间的时空变化和相互作用。Ca-HCO 3型水占主导地位的研究领域，代表70.7%，（夏季）和81%（冬季）的样品。化学和同位素值呈现出一定的空间差异，但最小的时间变化，除了在乌兰巴托下游的Tuul河水。Tuul河主要以Ca-HCO 3型水为主，但在时间和空间上存在差异，污水排放后下游区域夏季转变为Ca-Na-HCO 3型水，冬季转变为Na-Ca-HCO 3型水。此外，Tuul河的电导率（EC）值随着距离的增加而逐渐增加，在与处理过的废水排放和雨水排水渠混合后，浓度增加了一倍以上，为人为影响提供了明确的证据。河漫滩地下水和河水的稳定同位素和化学特征的相似性表明，当地的冲积地下水与图尔河水的补给，而远程地下水水质表现出较高水平的矿物和稳定同位素。聚类分析清楚地表明了洪泛区地下水和河水之间的联系，以及与雨水和经处理的废水排放有关的人为排放的影响。分析结果还表明，聚类分析是一个有用的方法，优化未来的空间采样策略，并提供了一个可靠的分类，在该地区，特别是沿着图尔河采样站。
Hydrochemistry and stable isotope tracing approaches were applied to groundwater and surface waters (rivers, springs, stormwater drainage canals, and treated wastewater discharges) to study the spatiotemporal geochemical and stable isotope characteristics and their interactions. The analysis revealed spatiotemporal variations and interactions between groundwater and surface water. Ca-HCO3-type water dominated the study area; representing 70.7%, (summer) and 81% (winter) of the samples. The chemical and isotopic values presented some spatial differences but minimal temporal changes, except in Tuul River water downstream of Ulaanbaatar. The Tuul River was mostly characterized as Ca-HCO3-type water, but varied temporally and spatially, shifting to Ca-Na-HCO3-type water in summer and Na-Ca-HCO3-type in winter in the downstream region after wastewater discharge. Also, electrical conductivity (EC) values of Tuul River are increasing gradually with distance, and more than double in concentration after mixing with treated wastewater discharges and stormwater drainage canals, providing clear evidence of anthropogenic impacts. The similarity in the stable isotopes and chemical characteristics of floodplain groundwater and river water suggest that local recharge of the alluvial groundwater with Tuul River water, whereas distant groundwater quality exhibited higher levels of minerals and stable isotopes. Cluster analysis clearly indicated a connection between floodplain groundwater and river water, and also the effect of anthropogenic discharges associated with stormwater and treated wastewater discharges. The analysis results also show that cluster analysis is a useful approach for optimizing future spatial sampling strategies, and offers a reliable classification of sampling stations in the region, especially along Tuul River.