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Analysis of the Characteristics of the River Bed Variation for Gagok Down Stream Considering Flood Season

  • Crisisonomy
  • Abbr : KRCEM
  • 2013, 9(5), pp.103-116
  • Publisher : Crisis and Emergency Management: Theory and Praxis
  • Research Area : Social Science > Public Policy > Public Policy in general

Maeng, Seung-jin 1,  이승욱 2,  황길순 3,  김동억 4

1충북대학교
2웹솔루스
3한라건설(주)
4한라건설

Accredited

ABSTRACT

In this study, the long-term runoff of Gagok’s downstream was estimated using SSARR (Stream Synthesis and Reservoir Regulation), a hydrology model, while change in the riverbed was simulated using RMA-2 and SED-2D to predict future River Bed Variation under the assumption that changes in the flow velocity of the upper stream and past discharge due to the creation of general development estate for a breakwater of Hosan Port and LNG production plant in the estuary of Gagok Stream will occur in the future. Parameters of SSARR model should be calculated through verification with the observed runoff volume. However, since no observation data is available on the water system, the parameters of the Pyeong Chang River basin with reliable observation data and similar physical characteristics to those of the watershed were applied. In addition, the daily mean runoff on the previous year was calculated by simulating daily runoff from 1972 to 2011, and flood discharge estimated through flow regime alternation analysis was used as the boundary condition. Based on survey data, terrain data, the input data of a hydraulic model was constructed, and the downstream boundary condition was calculated at EL.14.0m by means of a trial error method. Results of the hydraulic model analysis showed that the maximum value of mean flow velocity by cross section was 1.16m/s, occurring in the section where analysis begins, and the minimum value was 0.31m/s, which was simulated in the downstream. Results of the River Bed Variation analysis using SED-2D showed minimal change in the behaviors of the right bank in the section where analysis begins. Sedimentation aspects of the longitudinal section in the downstream also showed a tendency to decrease. These results point to the conclusion that the decision to include or exclude sedimentation of flood discharge introduced from the upper stream has a significant effect on River Bed Variation. Accordingly, it is necessary to conduct an analysis of the River Bed Variation due to the construction of a general development estate for a breakwater at Hosan Port and the LNG production plant by securing observation data constantly in the future, which will in turn help prepare measures to mitigate damages caused by floods.

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