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http://dx.doi.org/10.17820/eri.2018.5.1.025

Prediction and Historical Analysis of Long-term Bed Elevation Change in the Mankyung-gang River  

Kim, Seung Ki (Department of Civil and Environmental Engineering, Yonsei University)
Kim, Ji Sung (Hydro Science and Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology)
Kim, Kyu Ho (Hydro Science and Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology)
Choi, Sung-Uk (Department of Civil and Environmental Engineering, Yonsei University)
Publication Information
Ecology and Resilient Infrastructure / v.5, no.1, 2018 , pp. 25-34 More about this Journal
Abstract
This study presents prediction and historical analysis of the long-term bed elevation change in the Mankyung-gang River. The study area is a 25 km long reach including middle and lower courses of the Mankyung-gang River. HEC-RAS program was used for numerical predictions, and values of roughness coefficients were calibrated. Then, predictions were made in the two periods, seven years from 1986 to 1993 and twelve years from 1993 to 2005. Simulation results were compared with two sets of measured data for bed elevations. Four sediment transport formulas, namely MPM's, Toffaleti's, MPM-Toffaleti's, and Yang's formula, were tested. Simulation results showed that none of the four sediment transport formulas predicted the bed elevation change in the period of 1986 - 1993. This is related to the fact that dredging work was performed in the upstream reach in the period of 1986 - 1993, and sediment was deposited in this part severely later. However, it was found that MPM-Toffaleti's formula predicted properly the bed elevation change for the period of 1993 - 2005.
Keywords
Bed elevation change; Dredging; Historical analysis; Sediment transport;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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