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Article

Hydrological Modeling of Karst Watershed Containing Subterranean River Using a Modified SWAT Model: A Case Study of the Daotian River Basin, Southwest China

1
Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang 050061, China
2
China University of Geosciences (Beijing), Beijing 100083, China
3
Key Laboratory of Groundwater Sciences and Engineering, Ministry of Natural Resources, Shijiazhuang 050061, China
*
Author to whom correspondence should be addressed.
Academic Editors: Linus T. Zhang and Jorge Alberto Martins
Water 2021, 13(24), 3552; https://doi.org/10.3390/w13243552
Received: 1 November 2021 / Revised: 8 December 2021 / Accepted: 9 December 2021 / Published: 12 December 2021
(This article belongs to the Special Issue Advances and Challenges in Hydrological Modeling and Engineering)
Karst watershed refers to the total range of surface and underground recharge areas of rivers (including subterranean rivers and surface rivers) in karst areas. Karst water resources, as the primary source of domestic water supply in southwest China, are vital for the social and economic development of these regions. It is greatly significant to establish a high-precision hydrological model of karst watershed for guiding water resources management in karst areas. Choosing the Daotian river basin in the Wumeng Mountains of Southwest China as the study area, this paper proposed a method for simplifying karst subterranean rivers into surface rivers by modifying the digital elevation model (DEM) based on a field survey and tracer test. This method aims to solve the inconsistency between the topographical drainage divides and actual catchment boundaries in karst areas. The Soil and Water Assessment Tool (SWAT) model was modified by replacing the single-reservoir model in the groundwater module with a three-reservoir model to depict the constraints of multiple media on groundwater discharge in the karst system. The results show that the catchment areas beyond topographic watershed were effectively identified after simplifying subterranean rivers to surface rivers based on the modified DEM data, which ensured the accuracy of the basic model. For the calibration and two validation periods, the Nash–Sutcliffe efficiencies (NSE) of the modified SWAT model were 0.87, 0.83, and 0.85, respectively, and R2 were 0.88, 0.84, and 0.86, respectively. The NSE of the modified SWAT model was 0.09 higher than that of the original SWAT model in simulating baseflow, which effectively improved the simulation accuracy of daily runoff. In addition, the modified SWAT model had a lower uncertainty within the same parameter ranges than the original one. Therefore, the modified SWAT model is more applicable to karst watersheds. View Full-Text
Keywords: karst watershed; modified SWAT; runoff simulation; karst subterranean river karst watershed; modified SWAT; runoff simulation; karst subterranean river
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MDPI and ACS Style

Geng, X.; Zhang, C.; Zhang, F.; Chen, Z.; Nie, Z.; Liu, M. Hydrological Modeling of Karst Watershed Containing Subterranean River Using a Modified SWAT Model: A Case Study of the Daotian River Basin, Southwest China. Water 2021, 13, 3552. https://doi.org/10.3390/w13243552

AMA Style

Geng X, Zhang C, Zhang F, Chen Z, Nie Z, Liu M. Hydrological Modeling of Karst Watershed Containing Subterranean River Using a Modified SWAT Model: A Case Study of the Daotian River Basin, Southwest China. Water. 2021; 13(24):3552. https://doi.org/10.3390/w13243552

Chicago/Turabian Style

Geng, Xinxin, Chengpeng Zhang, Feng’e Zhang, Zongyu Chen, Zhenlong Nie, and Min Liu. 2021. "Hydrological Modeling of Karst Watershed Containing Subterranean River Using a Modified SWAT Model: A Case Study of the Daotian River Basin, Southwest China" Water 13, no. 24: 3552. https://doi.org/10.3390/w13243552

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