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Response of surface evaporation and subsurface leakage to precipitation for simulated epikarst with different rock-soil structures
Jia Chen; Weijun Luo; Guangneng Zeng; Yanwei Wang; Yina Lyu; Xianli Cai; Lin Zhang; Anyun Cheng; Xinbao Zhang; Shijie Wang
2022
Source PublicationJournal of Hydrology
Volume610Pages:127850
Abstract

Karst water is an extremely important resource and can respond to precipitation events quickly due to the high rock exposure rate, shallow and uneven soil layers, and various crack sizes. The impacts of this special rock-soil structure type on hydrological processes are difficult to quantify, mainly because the karst subsurface structure is very complex. In this study, lysimeters representing four rock-soil structures with two rock exposure rates (50% and 80%) and two soil thicknesses (5 cm and 20 cm) were constructed at the Puding Karst Ecosystem Research Station, Chinese Academy of Sciences. The following results were obtained by observing the evaporation and leakage from September 2019 to August 2020. 1) Over a year, the evaporation of the 80% rock exposure lysimeter was approximately 8% less than that of the 50% rock exposure lysimeter, while the two lysimeters with different soil thicknesses had only a 2% difference in evaporation. 2) The surface evaporation of different rock exposure rates varies greatly after different rainfall intensities. However, there was no significant change in surface evaporation between different soil thicknesses after rainfall of different intensities. 3) Generally, with the increase in the rock exposure rate, the infiltration coefficient nonlinearly increased. The leakage coefficients for cracks of different sizes and different soil thicknesses were approximately 0.67 and 0.57, respectively. 4) The amount of leakage and the time to reach the peak flow varied greatly among different rock-soil structures and were also affected by the antecedent rainfall. Thus, rock exposure has a great impact on surface evaporation after rainfall, and the influence of cracks on subsurface hydrological processes was greater than that of soil thickness. These findings can provide a scientific reference for water use and management practices in karst areas.

KeywordRock–soil Structure evaporation leakage rainfall Intensity lysimeter
DOI10.1016/j.jhydrol.2022.127850
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Indexed BySCI
Language英语
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Cited Times:10[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/13505
Collection环境地球化学国家重点实验室
Affiliation1.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
2.University of Chinese Academy of Sciences, Beijing 100049, China
3.College Rural Revitalization Research Center of Guizhou, Anshun 561000, China
4.Puding Karst Ecosystem Research Station, Chinese Academy of Sciences, Puding 562100, China
5.College of Eco-Environmental Engineering, Guizhou Minzu University, Guiyang 550025, China
6.Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China
Recommended Citation
GB/T 7714
Jia Chen,Weijun Luo,Guangneng Zeng,et al. Response of surface evaporation and subsurface leakage to precipitation for simulated epikarst with different rock-soil structures[J]. Journal of Hydrology,2022,610:127850.
APA Jia Chen.,Weijun Luo.,Guangneng Zeng.,Yanwei Wang.,Yina Lyu.,...&Shijie Wang.(2022).Response of surface evaporation and subsurface leakage to precipitation for simulated epikarst with different rock-soil structures.Journal of Hydrology,610,127850.
MLA Jia Chen,et al."Response of surface evaporation and subsurface leakage to precipitation for simulated epikarst with different rock-soil structures".Journal of Hydrology 610(2022):127850.
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