Arid
DOI10.1016/j.catena.2017.03.022
Understanding recharge in soil-groundwater systems in high loess hills on the Loess Plateau using isotopic data
Tan, Hongbing; Liu, Zihao; Rao, Wenbo; Jin, Ben; Zhang, Yudong
通讯作者Tan, Hongbing
来源期刊CATENA
ISSN0341-8162
EISSN1872-6887
出版年2017
卷号156页码:18-29
英文摘要

The topography on the eastern and western sides of the Liupan Mountains (northwestern China) is characterized by hilly and gully loess deposits with elevations above 1000 m. This study aims to uncover the mechanisms governing loess groundwater and soil water recharge in these relatively arid to semiarid higher loess hills on the basis of temporal soil profiles. The results show that during the four monitoring periods, the distinct variations of soil water and Cl contents in soil water at different times in the upper parts of loess profiles, particularly the increasing water content after the rainy season above 7.5 m, indicate that temporal precipitation can at least infiltrate to 7.5 m in depth. These variations attenuate as depth increases. Discernable variations in delta O-18 and delta H-2 values in soil water can also be identified at different times and even in deeper parts of the soil profiles. However, based on the average values in the steady-state hydrologic layer (SSL) in the soil profiles, very small temporal variations in average delta O-18 and delta H-2 values in the soil water in the SSL are observed if the analytical uncertainties of delta H-2 and delta O-18 are considered. The delta O-18 and delta H-2 values in groundwater show relatively similar temporal fluctuations as the average values of soil water in the SSL at the same times. They are also close to the local weighted average annual precipitation. Groundwater sampled in May 2013 revealed elevated tritium concentrations in both the monitoring well and the springs or wells. The monitoring well displays a lower tritium isotope content (2.26 TU), and others show higher contents in lower areas. The radio-carbon 14 isotope in the monitoring well also shows a lower content of approximately 25.95 pmC. Thus, it can be inferred that in a general year, temporal precipitation can rapidly infiltrate and reach the depth (below 7.5 m) of the loess profile through various preferential conduits, preventing the water from evaporating near the surface. Then, the soil water slowly percolates downwards, mimicking a piston-like flow, and finally recharges groundwater. These dual flow modes that exist inside loess deposits are the main mechanisms that maintain soil water and relatively abundant groundwater resources.


英文关键词Soil water Groundwater Isotopes Recharge High loess hills Loess Plateau
类型Article
语种英语
国家Peoples R China
收录类别SCI-E
WOS记录号WOS:000404305700003
WOS关键词STABLE-ISOTOPE ; WATER ; CHINA ; MECHANISM ; VEGETATION ; TRITIUM ; O-18
WOS类目Geosciences, Multidisciplinary ; Soil Science ; Water Resources
WOS研究方向Geology ; Agriculture ; Water Resources
来源机构河海大学
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/198049
作者单位Hohai Univ, Sch Earth Sci & Engn, Nanjing 210098, Jiangsu, Peoples R China
推荐引用方式
GB/T 7714
Tan, Hongbing,Liu, Zihao,Rao, Wenbo,et al. Understanding recharge in soil-groundwater systems in high loess hills on the Loess Plateau using isotopic data[J]. 河海大学,2017,156:18-29.
APA Tan, Hongbing,Liu, Zihao,Rao, Wenbo,Jin, Ben,&Zhang, Yudong.(2017).Understanding recharge in soil-groundwater systems in high loess hills on the Loess Plateau using isotopic data.CATENA,156,18-29.
MLA Tan, Hongbing,et al."Understanding recharge in soil-groundwater systems in high loess hills on the Loess Plateau using isotopic data".CATENA 156(2017):18-29.
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