Wang Shi-Yu, Sun Cong-Jian, Chen Wei, Zhou Si-Jie, Zhang Xin
School of Geographical Science, Shanxi Normal University, Taiyuan 030031, China.
Research Center of Ecological Environment in the Middle Reaches of the Yellow River, Shanxi Normal University, Taiyuan 030031, China.
Huan Jing Ke Xue. 2023 Mar 8;44(3):1416-1428. doi: 10.13227/j.hjkx.202205063.
Kaidu River basin is a typical mountain oasis ecosystem in the northwest inland. Its hydrochemical environment information is of great significance to understand the regional hydrological process and optimize the allocation of water resources. Based on the collection of samples of various water bodies in mountainous and oasis areas in different seasons in 2020, this study analyzed the water chemical characteristics and hydraulic links in this region. The results showed that:① the water body in the study area was slightly alkaline as a whole, and the pH and TDS values showed the spatial changes of low in the oasis area and high in the mountain area; HCO and Ca were the main anions and cations. The regional hydrochemical type was mostly HCO-Ca, and the hydrochemical type of groundwater in the oasis area was more complex than that in the mountainous area. Regional hydrochemical changes were mainly controlled by rock weathering and human disturbance. ② The O and D values of the river water showed the seasonal changes of dilution in summer and enrichment in spring, whereas groundwater was depleted in winter and spring and enriched in autumn. Precipitation and glacial water did not change significantly within a year. In space, the O and D values of river water and groundwater showed the law of enrichment in the oasis area and dilution in the mountainous area. ③ The relationship between surface water and groundwater in the study area was close, and the transformation was frequent in summer. The relationship between surface water and groundwater in the oasis area was closer than that in the mountainous area. Groundwater in the oasis area was recharged by groundwater in the previous period, river water, and precipitation, and the recharge rate was usually groundwater in the previous period>river water>precipitation.
开都河流域是西北内陆典型的山地绿洲生态系统。其水化学环境信息对于了解区域水文过程和优化水资源配置具有重要意义。基于2020年不同季节对山区和绿洲区各类水体样本的采集，本研究分析了该区域的水化学特征及水力联系。结果表明：①研究区水体整体呈弱碱性，pH值和TDS值呈现出绿洲区低、山区高的空间变化特征；HCO₃⁻和Ca²⁺分别为主要阴离子和阳离子。区域水化学类型多为HCO₃⁻-Ca型，绿洲区地下水水化学类型比山区更为复杂。区域水化学变化主要受岩石风化和人类活动干扰控制。②河水的δ¹⁸O和δ²H值呈现出夏季稀释、春季富集的季节变化特征，而地下水在冬春季节亏损、秋季富集。降水和冰川水在一年内变化不显著。在空间上，河水和地下水的δ¹⁸O和δ²H值呈现出绿洲区富集、山区稀释的规律。③研究区地表水与地下水关系密切，夏季转化频繁。绿洲区地表水与地下水的关系比山区更为紧密。绿洲区地下水接受前期地下水、河水和降水的补给，补给率通常为前期地下水>河水>降水。
