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http://dx.doi.org/10.3741/JKWRA.2017.50.12.827

Optimal parameter derivation for Muskingum method in consideration of lateral inflow and travel time  

Kim, Sang Ho (Department of Civil Engineering, Sangji University)
Kim, Ji-sung (Hydro Science and Engineering Research Institute, Korea Institute of Civil engineering and building Technology)
Lee, Chang Hee (Department of Renewable Energy Resources, Jungwon University)
Publication Information
Journal of Korea Water Resources Association / v.50, no.12, 2017 , pp. 827-836 More about this Journal
Abstract
The most important parameters of the Muskingum method, widely used in hydrologic river routing, are the storage coefficient and the weighting factor. The Muskingum method does not consider the lateral inflow from the upstream to the downstream, but the lateral inflow actually occurs due to the rainfall on the watershed. As a result, it is very difficult to estimate the storage coefficient and the weighting factor by using the actual data of upstream and downstream. In this study, the flow without the lateral inflow was calculated from the river flow through the hydraulic flood routing by using the HEC-RAS one-dimensional unsteady flow model, and the method of the storage coefficient and the weighting factor calculation is presented. Considering that the storage coefficient relates to the travel time, the empirical travel time formulas used in the establishment of the domestic river basin plan were applied as the storage coefficient, and the simulation results were compared and analyzed. Finally, we have developed a formula for calculating the travel time considering the flow rate, and proposed a method to perform flood routing by updating the travel time according to the inflow change. The rise and fall process of the flow rate, the peak flow rate, and the peak time are well simulated when the travel time in consideration of the flow rate is applied as the storage coefficient.
Keywords
Channel flood routing; Muskingum; Travel time; Storage constant; Lateral inflow;
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