摘要
Identifying interactions among river water,groundwater and salt lake brine is important for sustainable exploitation of brine mineral resources.In this study,we investigated the water exchange rate in dry and wet seasons,and assessed the influence of seasonal water exchange on brine concentration and crystallization process in the Nalenggele(NLGL)catchment of Qaidam Basin,China.The results show that the surface water infiltration and groundwater recharge rates in the wet season were 2.81×10^(-3)and 1.15×10^(-3)m^(3)/(s·m)in upstream,1.63×10^(-2)and 1.53×10^(-2)m^(3)/(s·m)in midstream,and 2.83×10^(-4)and 6.82×10^(-5)m^(3)/(s·m)in downstream,respectively;while their counterparts in the dry season were 9.81×10^(-4)and 5.05×10^(-4)m^(3)/(s·m)in upstream,and 8.34×10^(-3)and 7.78×10^(-3)m^(3)/(s·m)in midstream,respectively.The water exchange strongly influenced brine concentration and crystallinzation process,with brine chemistry belonging to 3K_(2)SO_(4)·Na_(2)SO_(4) and KCl types in wet and dry seasons,respectively.The strong water exchange in wet season destroyed the water-salt balance,while the low water exchange rate in dry season facilitated preparation of KCl products.
基金
supported by the Key Deployment projects of the Chinese academy of sciences(No.ZDRW-ZS-2020-3)
the Funds for the Qinghai Province(Nos.2020-ZJ-932Q
2020-ZJ-732)
the National Natural Science Foundation of China(No.42007169)
the“Western Light”of Chinese Academy of Sciences
the Fourth Batch of Qinghai Province“Thousand Talents Program for High-end Innovative Talents”(No.2020000051)
supported by the Second Tibetan Plateau Scientific Expedition and Research Program(No.2019QZKK0805)。
