Identifying the deep groundwater recharge processes in an intermountain basin using the hydrogeochemical and water isotope characteristics

被引:32
作者
Shakya, Bijay Man [1 ]
Nakamura, Takashi [2 ]
Das Shrestha, Suresh [3 ]
Nishida, Kei [2 ]
机构
[1] Univ Yamanashi, Integrated Grad Sch Med Engn & Agr Sci, Kofu, Yamanashi 4008511, Japan
[2] Univ Yamanashi, Interdisciplinary Res Ctr River Basin Environm, Kofu, Yamanashi 4008511, Japan
[3] Tribhuvan Univ, Cent Dept Geol, Kathmandu, Nepal
来源
HYDROLOGY RESEARCH | 2019年 / 50卷 / 05期
关键词
chemical composition; groundwater recharge; intermountain basin; Kathmandu Valley; stable isotopes of water; KATHMANDU VALLEY; STABLE-ISOTOPES; SHALLOW GROUNDWATER; QUALITY; DYNAMICS; NEPAL;
D O I
10.2166/nh.2019.164
中图分类号
TV21 [水资源调查与水利规划];
学科分类号
081501 ;
摘要
The hydrogeochemical and stable isotopes of water (delta D and delta O-18) were combined to investigate the deep groundwater recharge processes in the geologically complex intermountain basin (Kathmandu Valley). Results of the stable isotopic composition of the deep groundwater compared with global and local meteoric water lines and d-excess showed the deep groundwater as a meteoric water origin which is insignificantly affected by evaporation. The analysis suggests the deep groundwater was recharged during high rainfall periods (wet season). Additionally, the control of seasonal variation was absent in the deep groundwater and in the spring water samples. The large range of isotopic composition distribution was due to the altitude affect, whereas variations are from the various geological settings of the infiltration encountered during the recharge processes. The tri-linear diagram showed Na-K-HCO3 and Ca-Mg-HCO3 as the two major water types. The distribution of water types in this intermountain basin was found to be unique compared to other basins. Ionic concentration of the samples was found to be higher in the central part than in the periphery due to the ion exchange processes. This study determines the spatial distribution of various recharge processes that depends upon the environment during rainfall and the geological settings.
引用
收藏
页码:1216 / 1229
页数:14
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