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Analysis of Hydraulic Impacts due to Sudden Enlargement of Kyungpo-cheon River Channel

경포천 하도 급확대에 따른 수리학적 영향분석

  • Choi, Jong-Ho (Graduate School of Disaster Prevention, Kangwon National University) ;
  • Jung, Tae-Jung (Graduate School of Disaster Prevention, Kangwon National University) ;
  • Jun, Kye-Won (Graduate School of Disaster Prevention, Kangwon National University)
  • 최종호 (강원대학교 방재전문대학원) ;
  • 정태정 (강원대학교 방재전문대학원) ;
  • 전계원 (강원대학교 방재전문대학원)
  • Received : 2019.05.13
  • Accepted : 2019.06.14
  • Published : 2019.06.30

Abstract

The enlargement and reduction of river channels can not only change the flow of water but also alter sedimentation patterns, thus hindering smooth flood conveyance. Accordingly, this study aims to analyze the effects of the sudden enlargement of river channels on changes in the riverbed and river flow. For this purpose, as part of the "Hometown River" Construction Project, this study examined the local river Kyungpo-cheon, which a section of the river channel was widened by at least two- to three-fold, using RMA-2 and SED-2D models to simulate the changes in flow characteristics and riverbed variation due to the widening of the channel. The results of the study indicated that widening the Kyungpo -cheon river channel secured its dimensional stability in comparison to before widening. however, due to a flood frequency of more than once per year, future maintenance and management will be costly and time-consuming.

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Fig. 1. Study area

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Fig. 2. Construction of topographic data for RMA-2 model

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Fig. 3. Distribution of flow velocity and water depth for case 1

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Fig. 4. Distribution of flow velocity and water depth for case 2

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Fig. 5. Distribution of flow velocity and water depth for case 3

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Fig. 6. Distribution of flow velocity and water depth for case 4

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Fig. 7. SED-2D numerical simulation result

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Fig. 8. Bed change before river improvement

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Fig. 9. Bed change after river improvement

Table 1. River width change of study area

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Table 2. Calculation conditions for numerical simulation

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Table 3. Comparison of 1-D and 2-D Model Results according to channel enlargement

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Table 4. Comparison before and after river improvement in Dominant discharge (1.58-year) condition

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Table 5. Comparison before and after river improvement in design flood discharge (100-year) condition

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Acknowledgement

Supported by : Ministry of the Interior and Safety

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