The Variability of Stable Water Isotopes and the Young Water Fraction in a Mountainous Catchment

被引:2
|
作者
Ye, Sheng [1 ]
Liu, Lin [1 ]
Chen, Xiuxiu [1 ]
Li, Peng [2 ]
Xu, Guoce [2 ]
Ran, Qihua [1 ]
机构
[1] Zhejiang Univ, Sch Civil Engn, Inst Hydrol & Water Resources, Hangzhou, Peoples R China
[2] Xian Univ Technol, State Key Lab Base Ecohydraul Engn Arid Area, Xian, Peoples R China
基金
中国国家自然科学基金;
关键词
mean residence time; mountainous catchment; stable isotopes; young water fraction; TRANSIT-TIME DISTRIBUTIONS; RESIDENCE TIMES; DEUTERIUM EXCESS; FLOW PATHS; BASE-FLOW; PRECIPITATION; HYDROLOGY; OXYGEN; O-18; GROUNDWATER;
D O I
10.1002/clen.202100337
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Soil water movement is an important component in water cycle, which is also closely correlated with the transport of nutrients and contaminants in the catchment. Although there have been many studies in quantifying the water residence in soil, the understanding of the controlling factors is limited and could be controversial. Here, stable isotopes of water to explore the water age distribution in a mountainous catchment in the southwest China are used. The results are consistent with the regional climate pattern that the water vapor of the study catchment is brought by monsoons from Pacific Ocean in summer and prevailing westerly winds in winter. The estimated young water fraction is found to be strongly correlated with topographic gradient but presents no significant correlation with drainage area or vegetation coverage. Comparison between the difference in young water fraction of two adjacent sub-catchments suggests that soil water in the steeper sub-catchment tends to favor deep vertical infiltration, resulting in longer flow path, longer mean residence time, and smaller young water fraction. This difference between the soil water movement and the hydrological response revealed in this study has impacts on the biogeochemical cycles in the catchment.
引用
收藏
页数:9
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