| 西藏得不日错—拉果错湖链形态、水文与水化学特性 |
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| 关键词:Tibet Debure–Lagkor Co lake chain hydrochemistry |
| 基金项目:中国地质调查局地调工作项目(编号: DD20160025);国家自然科学基金项目(编号: 40573056) |
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| Morphologic, Hydrological and Chemical Characteristics of the Debuer–Lakkor Co Lake Chain in Tibet |
| Being a mini lake chain among the lake chains in the Tibetan Plateau, the Debuer–Lakkor Tso lake chain consists of three mini-to-small upstream freshwater lakes and one 92 km2 terminal saline lake (Lagkor Co). Researches indicate that this lake chain is a small watershed with clear spatial distribution of land, lakes and rivers; however, the lake water recharge capacity is not directly proportional to the area of sub-catchment basin to which the lakes belong, instead, the lake chain is recharged by the groundwater system developed underneath limestone landform in a manner of spanning spatial sequence via subterranean rivers, and the recharge capacity distinctly is related to shoreline development index (SDI). The lake retention time varies dramatically, as the headstream lake, Debure Co, has a lake retention time of only 4.39 days, while the terminal lake, Lagkor Co, has a lake retention time up to 1 586.96 days (4.35 years). In terms of water quality characteristics, three upstream lakes in the lake chain are very significantly similar, while the terminal lake is extremely similar to Jibu Caka and North Zabuye Lake that have no direct recharge relationship with it, indicating that the lakes in the Northern Tibetan Plateau have the same tendency of hydrochemical evolution. The concentrations of most components in the lake chain gradually increase with descending location of a lake in the lake chain. However, K+ undergoes a depletion process in the lakes and follows a rising process in the river courses; Ca2+ concentration follows a tendency of decreasing with the lake chain water body flowing forwards. The lake water salinity of Lagkor Co fell by 23.98% over 30 years after 1978, in agreement with the lake water freshening tendency of the lakes in the Tibetan Plateau; however, the SO2– 4and CO2– 3 values showed abnormal change, i.e., dramatic rise, the former rose by 127.77%, and the latter by 288.95%. Their causes remain to be looked into. In short, such groundwater-derived recharge characteristics of the lakes in the Tibetan Plateau shall be taken into full account in relevant hydrological observation studies of Tibetan lakes. |
| RAO Jiao-ping,JIA Qin-xian,LIU Xi-fang,WANG Hong-ping,LUO Yu-hu.2019.Morphologic, Hydrological and Chemical Characteristics of the Debuer–Lakkor Co Lake Chain in Tibet[J].Acta Geoscientica Sinica,40(5):737-746. |
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