| Title |
Flood Simulation for Basin-Shaped Urban Watershed Considering Surface Flow |
| Authors |
안정환(Ahn, Jeonghwan) ; 조원철(Cho, Woncheol) ; 정재희(Jung, Jaehee) |
| DOI |
https://doi.org/10.12652/Ksce.2014.34.3.0841 |
| Keywords |
XP-SWMM 2011 모형;유역중첩법;침수특성치;노면류;노면 경사도;유입효율 XP-SWMM 2011 model;Basin-overlap method;Flood characteristic values;Surface flow;Surface slope;Inflow efficiency |
| Abstract |
This study presents the analysis of flow and bed change characteristics considering bed protection work built on the immediate downstream of weir to protect river bed from scouring. The study area is 37km reach from Hyunpoong station to Masuwon station including Hapcheon- Changryoung multi-function weir in the Nakdong river. CCHE2D model is calibrated and validated for evaluating the flow and bed change characteristics during Typhoon Kompasu in 2010. Three simulation conditions are set up: Case 1 is a natural channel without installation of weir. Case 2 involves an installation of weir in the natural channel. Case 3 involves an installation of weir with bed protection in the natural channel. Flood frequency (50, 100 and 200yr) is applied to each scenario to analyze the effects of bed protection work. While the sediment rate is increased in the downstream of fixed gate and sluice-type gate, river bed scouring rate is increased in the downstream of lift-type gate in Case 2 comparing with the results of Case 1. The river bed scouring is not occurred in the immediate downstream of weir (~30m) due to the effect of bed protection, but larger amount of sediment is occurred in the downstream of weir (60m~) which the bed protection is not installed comparing with the results Case 1. Through the results of simulation considering bed protection work, this study would be helpful to expect bed change and operate the weir as well as manage. |