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Sediment Regimes in South Korea
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  • Chun-Yao Yang,
  • Woochul Kang,
  • Jai Hong,
  • Pierre Julien
Chun-Yao Yang
Hydrau-Tech Inc Fort Collins CO 80526 US
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Woochul Kang
Korea Institute of Civil Engineering and Building Technology
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Jai Hong
South Carolina State University
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Pierre Julien
Colorado State University Department of Civil and Environmental Engineering
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Abstract

This study provides a comprehensive review of the existing river measurement data of South Korea. The specific sediment yield in the country is 5–1,500 tons/km 2·year. The watershed area decisively affects the shapes of the curves for flow duration, sediment rating, and cumulative distribution of water and sediment discharge, and it can determine the effects of topographic and anthropogenic characteristics on erosion and sedimentation processes. Regarding flow regime, small watersheds have flashy hydrographs and high sediment concentrations at a given flow discharge. The coefficient of the sediment rating curves for various rivers decreases from 1 to 0.02 as the watershed area increases from 100 to 20,000 km 2, with the exponent of the curves ranging from 1.5 to 2.0. Moreover, sediment transport in small watersheds depends on large floods. The half-yield discharge typically ranges from 5 to 40 times the mean discharge, and it decreases with increasing watershed area. This study proposes equations to calculate the annual discharges, flow duration curves, sediment yield, and cumulative distribution curves of the flow and sediment, as well as the sediment yield at reservoirs in South Korea. Additionally, the sediment regimes in the country are compared to those in other continental regions.

Peer review status:Published

13 Jul 2021Submitted to River Research and Applications
13 Jul 2021Submission Checks Completed
13 Jul 2021Assigned to Editor
16 Jul 2021Review(s) Completed, Editorial Evaluation Pending
17 Jul 2021Reviewer(s) Assigned
29 Aug 2021Editorial Decision: Revise Major
28 Sep 20211st Revision Received
28 Sep 2021Submission Checks Completed
28 Sep 2021Assigned to Editor
28 Sep 2021Review(s) Completed, Editorial Evaluation Pending
01 Oct 2021Reviewer(s) Assigned
13 Oct 2021Editorial Decision: Accept
17 Nov 2021Published in River Research and Applications. 10.1002/rra.3896