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Open AccessArticle

Numerical Approaches for Estimating Daily River Leakage from Arid Ephemeral Streams

1
Hebei Key Laboratory of Water-Saving Agriculture, Key Laboratory of Agricultural Water Resources, The Innovative Academy of Seed Design, Center for Agricultural Resources Research, Chinese Academy of Sciences, Shijiazhuang 050021, China
2
Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, 11A, Datun Road, Chaoyang District, Beijing 100101, China
3
Department of Hydrogeology, Lomonosov Moscow State University, GSP-1, Leninskie Gory, Moscow 119899, Russia
4
College of Resources and Environment, University of the Chinese Academy of Sciences, Beijing 100049, China
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Water 2020, 12(2), 499; https://doi.org/10.3390/w12020499
Received: 27 December 2019 / Revised: 5 February 2020 / Accepted: 9 February 2020 / Published: 12 February 2020
Despite the significance of river leakage to riparian ecosystems in arid/semi-arid regions, a true understanding and the accurate quantification of the leakage processes of ephemeral rivers in these regions remain elusive. In this study, the patterns of river infiltration and the associated controlling factors in an approximately 150-km section of the Donghe River (lower Heihe River, China) were revealed using a combination of field investigations and modelling techniques. The results showed that from 21 April 2010 to 7 September 2012, river water leakage accounted for 33% of the total river runoff in the simulated segments. A sensitivity analysis showed that the simulated infiltration rates were most sensitive to the aquifer hydraulic conductivity and the maximum evapotranspiration (ET) rate. However, the river leakage rate, i.e., the ratio of the leakage volume to the total runoff volume, of a single runoff event relies heavily on the total runoff volume and river flow rate. In addition to the hydraulic parameters of riverbeds, the characteristics of ET parameters are equally important for quantifying the flux exchange between arid ephemeral streams and underlying aquifers. Coupled surface/groundwater models, which aim to estimate river leakage, should consider riparian zones because these areas play a dominant role in the formation of leakage from the river for recharging via ET. The results of this paper can be used as a reference for water resource planning and management in regulated river basins to help maintain riparian ecosystems in arid regions. View Full-Text
Keywords: river-aquifer interaction; numerical simulation; sensitivity analysis; MODFLOW; Heihe River river-aquifer interaction; numerical simulation; sensitivity analysis; MODFLOW; Heihe River
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MDPI and ACS Style

Min, L.; Vasilevskiy, P.Y.; Wang, P.; Pozdniakov, S.P.; Yu, J. Numerical Approaches for Estimating Daily River Leakage from Arid Ephemeral Streams. Water 2020, 12, 499.

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