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Non-Negligible Lag of Groundwater Infiltration Recharge: A Case in Mu Us Sandy Land, China

1,2,3,*, 1,2,3, 1,2,3, 2,4, 1,2,3 and 5
1
School of Environmental Science and Engineering, Chang’an University, Xi’an 710054, China
2
Key Laboratory of Subsurface Hydrology and Ecological Effect in Arid Regions of Ministry of Education, Xi’an 710054, China
3
Engineering Research Center of Groundwater and Eco-Environment of Shanxi Province, Xi’an 710054, China
4
Department of Hydrogeology and Environmental Geology, Xi’an Center of Geological Survey, CGS, Xi’an 710054, China
5
Qinghai No.3 Geology and Prospecting Institution, Xining 810019, China
*
Author to whom correspondence should be addressed.
Water 2019, 11(3), 561; https://doi.org/10.3390/w11030561
Received: 13 January 2019 / Revised: 3 March 2019 / Accepted: 13 March 2019 / Published: 18 March 2019
(This article belongs to the Section Hydrology)
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PDF [4861 KB, uploaded 18 March 2019]
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Abstract

Groundwater is often the main source of available water, and precipitation is one of the main recharge sources of groundwater in arid and semi-arid regions. This paper studies a fixed dune in Mu Us Sandy Land in China, establishes a numerical model, acquires hydraulic parameters and heat parameters of the vadose zone, and calculates the recharge coefficient based on field observation data and numerical modelling. These measurement results show that the response depths of storm rain are more than 90 cm, while those of small rain events are less than 10 cm. The numerical results show that infiltration depths are 10 cm for small rain and more than 90 cm for middle rain respectively. The lag time of the water content at 90 cm below the surface was 25 h following a middle rain, 18–19 h following a heavy rain, and 16–18 h following a storm rainfall. Groundwater recharge lag times (matrix flow) varied from 11 h to 48 h. Excluded precipitation for groundwater recharge was 11.25–11.75 mm in 1 h when groundwater depth was 120 cm and 15–15.5 mm when 140 cm, showing significant influence in groundwater resource evaluation. View Full-Text
Keywords: infiltration recharge lag; precipitation infiltration; invalid precipitation; shallow groundwater; semi-arid regions; Mu Us Sandy Land infiltration recharge lag; precipitation infiltration; invalid precipitation; shallow groundwater; semi-arid regions; Mu Us Sandy Land
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Yang, Z.-Y.; Wang, K.; Yuan, Y.; Huang, J.; Chen, Z.-J.; Li, C. Non-Negligible Lag of Groundwater Infiltration Recharge: A Case in Mu Us Sandy Land, China. Water 2019, 11, 561.

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