Groundwater evolution and recharge determination of the Quaternary aquifer in the Shule River basin, Northwest China | Evolution des eaux souterraines et détermination de la recharge de l’aquifère quaternaire dans le bassin de la rivière Shule, Nord-Ouest de la Chine Evolución del agua subterránea y determinación de la recarga del acuífero Cuaternario en la Cuenca del Río Shule, Noroeste de China 中国西北地区疏勒河流域第四纪含水层地下水演化及其补给研究 Evolução das águas subterrâneas e determinação da recarga do aquífero Quaternário na bacia do Rio Shule, Noroeste da China
2015
He, Jianhua | Ma, Jinzhu | Zhao, Wei | Sun, Shuang
Groundwater recharge and evolution in the Shule River basin, Northwest China, was investigated by a combination of hydrogeochemical tracers, stable isotopes, and radiocarbon methods. Results showed the general chemistry of the groundwater is of SO₄ ²⁻ type. Water–rock reactions of halite, Glauber’s salt, gypsum and celestite, and reverse ionic exchange dictated the groundwater chemistry evolution, increasing concentrations of Cl⁻, Na⁺, SO₄ ²⁻, Ca²⁺, Mg²⁺ and Sr²⁺ in the groundwater. The δ¹⁸O and δ²H values of groundwater ranged from −10.8 to −7.7 and −74.4 to −53.1 ‰, respectively. Modern groundwater was identified in the proluvial fan and the shallow aquifer of the fine soil plain, likely as a result of direct infiltration of rivers and irrigation returns. Deep groundwater was depleted in heavy isotopes with ¹⁴C ages ranging from 3,000 to 26,000 years, suggesting palaeowater that was recharged during the late Pleistocene and middle Holocene epochs under a cold climate. These results have important implications for groundwater management in the Shule River basin, since large amounts of groundwater are effectively being mined and a water-use strategy is urgently needed.
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