Analysis of soil water movement inside a footslope and a depression in a karst catchment, Southwest China

Abstract Soil water movement is difficult to explain with event-scale approaches, especially in karst regions. This paper focuses on investigating seasonal recharge and mean residence time (MRT) of soil water based on temporal variation of stable isotopes (δD and δ18O) and a dispersion model (DM), a...

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Autores principales:	Hongsong Chen, Ke Hu, Yunpeng Nie, Kelin Wang
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/3c4401b094164b73958648d067fa231f
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spelling	oai:doaj.org-article:3c4401b094164b73958648d067fa231f2021-12-02T11:41:01ZAnalysis of soil water movement inside a footslope and a depression in a karst catchment, Southwest China10.1038/s41598-017-02619-x2045-2322https://doaj.org/article/3c4401b094164b73958648d067fa231f2017-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-02619-xhttps://doaj.org/toc/2045-2322Abstract Soil water movement is difficult to explain with event-scale approaches, especially in karst regions. This paper focuses on investigating seasonal recharge and mean residence time (MRT) of soil water based on temporal variation of stable isotopes (δD and δ18O) and a dispersion model (DM), and discussing their differences along a footslope and a depression in a small karst catchment of southwest China. Temporal variations of the stable isotopes in precipitation and soil water within 0–100 cm profiles were monitored weekly for approximately 43 and 99 weeks. Results show that the seasonal recharge of soil water inside the footslope and the depression were similar, but the vertical flow velocity was higher implying a faster hydrological process in the footslope. The MRT of soil water (2–64 weeks) increased roughly, suggesting decreasing velocity of water displacement with increasing depth. However, the MRT at 60–100 cm depths in the depression (47–64 weeks) was obviously longer than at other sites, revealing more intensive water mixing. Furthermore, a shallower isotopic damping depth was found in the depression, indicating stronger delay and attenuation effects on base flow recharge. These results provide new insights into research on hydrological processes in karst areas.Hongsong ChenKe HuYunpeng NieKelin WangNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-13 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Hongsong Chen Ke Hu Yunpeng Nie Kelin Wang Analysis of soil water movement inside a footslope and a depression in a karst catchment, Southwest China
description	Abstract Soil water movement is difficult to explain with event-scale approaches, especially in karst regions. This paper focuses on investigating seasonal recharge and mean residence time (MRT) of soil water based on temporal variation of stable isotopes (δD and δ18O) and a dispersion model (DM), and discussing their differences along a footslope and a depression in a small karst catchment of southwest China. Temporal variations of the stable isotopes in precipitation and soil water within 0–100 cm profiles were monitored weekly for approximately 43 and 99 weeks. Results show that the seasonal recharge of soil water inside the footslope and the depression were similar, but the vertical flow velocity was higher implying a faster hydrological process in the footslope. The MRT of soil water (2–64 weeks) increased roughly, suggesting decreasing velocity of water displacement with increasing depth. However, the MRT at 60–100 cm depths in the depression (47–64 weeks) was obviously longer than at other sites, revealing more intensive water mixing. Furthermore, a shallower isotopic damping depth was found in the depression, indicating stronger delay and attenuation effects on base flow recharge. These results provide new insights into research on hydrological processes in karst areas.
format	article
author	Hongsong Chen Ke Hu Yunpeng Nie Kelin Wang
author_facet	Hongsong Chen Ke Hu Yunpeng Nie Kelin Wang
author_sort	Hongsong Chen
title	Analysis of soil water movement inside a footslope and a depression in a karst catchment, Southwest China
title_short	Analysis of soil water movement inside a footslope and a depression in a karst catchment, Southwest China
title_full	Analysis of soil water movement inside a footslope and a depression in a karst catchment, Southwest China
title_fullStr	Analysis of soil water movement inside a footslope and a depression in a karst catchment, Southwest China
title_full_unstemmed	Analysis of soil water movement inside a footslope and a depression in a karst catchment, Southwest China
title_sort	analysis of soil water movement inside a footslope and a depression in a karst catchment, southwest china
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/3c4401b094164b73958648d067fa231f
work_keys_str_mv	AT hongsongchen analysisofsoilwatermovementinsideafootslopeandadepressioninakarstcatchmentsouthwestchina AT kehu analysisofsoilwatermovementinsideafootslopeandadepressioninakarstcatchmentsouthwestchina AT yunpengnie analysisofsoilwatermovementinsideafootslopeandadepressioninakarstcatchmentsouthwestchina AT kelinwang analysisofsoilwatermovementinsideafootslopeandadepressioninakarstcatchmentsouthwestchina
_version_	1718395456177831936

Analysis of soil water movement inside a footslope and a depression in a karst catchment, Southwest China

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