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Seasonal recharge and mean residence times of soil and epikarst water in a small karst catchment of southwest China

Soil and epikarst play an important role in the hydrological cycle in karst regions. This paper focuses on investigating the seasonal recharge and mean residence time (MRT) of soil water and epikarst water in a small karst catchment of southwest China. The deuterium contents in precipitation, creek,...

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Detalles Bibliográficos
Autores principales: Hu, Ke, Chen, Hongsong, Nie, Yunpeng, Wang, Kelin
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4426676/
https://www.ncbi.nlm.nih.gov/pubmed/25959092
http://dx.doi.org/10.1038/srep10215
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author Hu, Ke
Chen, Hongsong
Nie, Yunpeng
Wang, Kelin
author_facet Hu, Ke
Chen, Hongsong
Nie, Yunpeng
Wang, Kelin
author_sort Hu, Ke
collection PubMed
description Soil and epikarst play an important role in the hydrological cycle in karst regions. This paper focuses on investigating the seasonal recharge and mean residence time (MRT) of soil water and epikarst water in a small karst catchment of southwest China. The deuterium contents in precipitation, creek, soil baseflow (direct recharge of the saturated soil water to the stream), epikarst spring, and soil waters were monitored weekly for two years, and MRT was calculated by an exponential model (EM) and a dispersion model (DM). The obvious seasonal variation of deuterium in rainfall was buffered in epikarst water, indicating sufficient water mixing. Soil baseflow contained less rainy-season rainwater than epikarst spring discharge, reflecting the retarded effect of soil thickness on rainwater recharge. MRTs of all water bodies were 41-71 weeks, and soils in the depression extended those of shallow groundwater. This demonstrated that the deep soil layer played an important role in karst hydrological processes in the study catchment. The creek was recharged mostly by rainfall through epikarst, indicating its crucial role in water circulation. These results showed epikarst had a strong water-holding capacity and also delayed water contact time with dolomite.
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spelling pubmed-44266762015-05-21 Seasonal recharge and mean residence times of soil and epikarst water in a small karst catchment of southwest China Hu, Ke Chen, Hongsong Nie, Yunpeng Wang, Kelin Sci Rep Article Soil and epikarst play an important role in the hydrological cycle in karst regions. This paper focuses on investigating the seasonal recharge and mean residence time (MRT) of soil water and epikarst water in a small karst catchment of southwest China. The deuterium contents in precipitation, creek, soil baseflow (direct recharge of the saturated soil water to the stream), epikarst spring, and soil waters were monitored weekly for two years, and MRT was calculated by an exponential model (EM) and a dispersion model (DM). The obvious seasonal variation of deuterium in rainfall was buffered in epikarst water, indicating sufficient water mixing. Soil baseflow contained less rainy-season rainwater than epikarst spring discharge, reflecting the retarded effect of soil thickness on rainwater recharge. MRTs of all water bodies were 41-71 weeks, and soils in the depression extended those of shallow groundwater. This demonstrated that the deep soil layer played an important role in karst hydrological processes in the study catchment. The creek was recharged mostly by rainfall through epikarst, indicating its crucial role in water circulation. These results showed epikarst had a strong water-holding capacity and also delayed water contact time with dolomite. Nature Publishing Group 2015-05-11 /pmc/articles/PMC4426676/ /pubmed/25959092 http://dx.doi.org/10.1038/srep10215 Text en Copyright © 2015, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Hu, Ke
Chen, Hongsong
Nie, Yunpeng
Wang, Kelin
Seasonal recharge and mean residence times of soil and epikarst water in a small karst catchment of southwest China
title Seasonal recharge and mean residence times of soil and epikarst water in a small karst catchment of southwest China
title_full Seasonal recharge and mean residence times of soil and epikarst water in a small karst catchment of southwest China
title_fullStr Seasonal recharge and mean residence times of soil and epikarst water in a small karst catchment of southwest China
title_full_unstemmed Seasonal recharge and mean residence times of soil and epikarst water in a small karst catchment of southwest China
title_short Seasonal recharge and mean residence times of soil and epikarst water in a small karst catchment of southwest China
title_sort seasonal recharge and mean residence times of soil and epikarst water in a small karst catchment of southwest china
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4426676/
https://www.ncbi.nlm.nih.gov/pubmed/25959092
http://dx.doi.org/10.1038/srep10215
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