青海湖沙柳河流域不同时期地表水与地下水的相互作用

氢氧稳定同位素技术是研究地表水和地下水相互作用的有效手段。依据青海湖沙柳河流域2018年消融期、多雨期和冰冻期所收集的降水、河水和地下水样品中对氢氧同位素组成（δD、δ¹⁸O）的测定结果,识别和量化不同时期高山草原带和高山草甸带地表水和地下水间的补给关系和比例,其目的旨在明确高寒内陆河流域地表水和地下水δD和δ¹⁸O受降水影响的时空差异。结果表明：青海湖沙柳河流域地表水和地下水δD和δ¹⁸O值受降水响应存在时空差异性,δD和δ¹⁸O值在消融期受降水影响最强,冰冻期最弱;在高山草甸带δD和δ¹⁸O值受降水的影响强于高山草原带。消融期的高山草甸带、高山草原带和冰冻期的高山草原带地表水补给地下水的比例分别为80.65%、93.36%和89.44%;多雨期的高山草甸带、高山草原带和冰冻期的高山草甸带地下水补给地表水的比例分别为44.50%、74.85%和88.58%。研究结果可为该流域水资源优化配置和管理提供科学依据。

Study on surface water and groundwater interaction of Shaliu River Basin in Qinghai Lake in different periods

Hydrogen and oxygen stable isotope technology is an effective method to study the surface water-groundwater interaction. Based on the hydrogen and oxygen isotope component (δD and δ¹⁸O) of precipitation, river water and groundwater collected in the Shaliu River Basin of Qinghai Lake during ablation period, rainy period and freezing period in 2018, the paper aims to clarify the spatio-temporal differences between δD and δ¹⁸O values of surface water and groundwater under the influence of precipitation. We use the two-component method to reveal and ensure the interaction between surface water and groundwater of alpine steppe zone and alpine meadow zone in three periods. Results show that, the impact of precipitation on surface water and groundwater is different in space and time. Stable isotopic response of surface water and groundwater to precipitation on the time is the strongest in ablation period and the weakest in freezing period. And the stable isotopic response of surface water and groundwater to precipitation in alpine meadow zone is stronger than that in alpine steppe zone. In alpine meadow and alpine steppe zones of ablation period and alpine steppe zone of freezing period, surface water recharges groundwater, and the ratio is 80.65%, 93.36% and 89.44%, respectively. In alpine meadow and alpine steppe zones of ablation period and alpine meadow zone of freezing period, groundwater recharges surface water, and the ratio is 44.50%, 74.85% and 88.58%, respectively. Thus, this study provides a scientific basis for the optimization, allocation and management of water resources.