Research of Impacts of the 2018 Hokkaido Eastern Iburi Earthquake on Sediment Transport in the Atsuma River Basin Using the SWAT Model
1
Water Environment System laboratory, Muroran Institute of Technology, Mizumoto 27-1, Muroran 050-8585, Japan
2
OYO Corporation, Kanda Midoshiro 7, Chiyoda, Tokyo 101-8486, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Kazimierz Banasik
Water 2021, 13(3), 356; https://doi.org/10.3390/w13030356
Received: 30 October 2020
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Revised: 22 January 2021
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Accepted: 27 January 2021
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Published: 30 January 2021
(This article belongs to the Special Issue Hydrological Processes in Small Catchments—Runoff and Sediment Yield in Changing Environment)
Landslides, debris flows, and other secondary disasters caused by earthquakes threaten the safety and stability of river basins. Earthquakes occur frequently in Japan. Therefore, it is necessary to study the impact of earthquakes on sediment transport in river basins. In this study, considering the influence of reservoirs, the Soil and Water Assessment Tool-calibration and uncertainty program (SWAT-CUP) was employed to analyze the runoff parameter sensitivity and to optimize the parameters. We manually corrected the sediment transport parameters after earthquake, using the Soil and Water Assessment Tool (SWAT) model to assess the process of runoff and sediment transport in the Atsuma River basin before and after the 2018 Hokkaido Eastern Iburi Earthquake. The applicability of the SWAT model to runoff simulation in the Atsuma River basin and the changes of sediment transport process after the earthquake were studied. The research results show that the SWAT model can accurately simulate the runoff process in the Atsuma River basin, the Nash–Sutcliffe efficiency coefficient (NSE) is 0.61 in the calibration period, and is 0.74 in the verification period. The sediment transport increased greatly after the earthquake and it is roughly estimated that the amount of sediment transport per unit rainfall increased from 3.5 tons/mm/year before the earthquake to 6.2 tons/mm/year after the earthquake.
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Keywords:
SWAT model; SWAT-CUP software; runoff; sediment transport; Atsuma River basin; 2018 Hokkaido Eastern Iburi Earthquake
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MDPI and ACS Style
Chen, Y.; Nakatsugawa, M.; Ohashi, H. Research of Impacts of the 2018 Hokkaido Eastern Iburi Earthquake on Sediment Transport in the Atsuma River Basin Using the SWAT Model. Water 2021, 13, 356. https://doi.org/10.3390/w13030356
AMA Style
Chen Y, Nakatsugawa M, Ohashi H. Research of Impacts of the 2018 Hokkaido Eastern Iburi Earthquake on Sediment Transport in the Atsuma River Basin Using the SWAT Model. Water. 2021; 13(3):356. https://doi.org/10.3390/w13030356
Chicago/Turabian StyleChen, Yuechao, Makoto Nakatsugawa, and Hiroki Ohashi. 2021. "Research of Impacts of the 2018 Hokkaido Eastern Iburi Earthquake on Sediment Transport in the Atsuma River Basin Using the SWAT Model" Water 13, no. 3: 356. https://doi.org/10.3390/w13030356
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