Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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A Study on morphological characteristics of large river channel based on bathymetry and near-river survey

하천측량을 통한 대하천 유로의 형태학적 특성에 관한 연구

  • Ko, Joo Suk (Department of Civil Engineering, Changwon National University) ;
  • Kwak, Sunghyun (Department of Civil Engineering, Changwon National University) ;
  • Lee, Kyungsu (Department of Civil Engineering, Changwon National University) ;
  • Lyu, Siwan (Department of Civil Engineering, Changwon National University)
  • Received : 2018.12.18
  • Accepted : 2019.01.10
  • Published : 2019.02.28
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Abstract

The linear and cross-sectional shapes of the natural river channel are subjected to continuous changes in time and space due to the interaction with the flow of water and sediment transport. This study aims to investigate the morphological characteristics and change patterns of river channel quantitatively for the middle reach of Nakdong River, which has undergone large scale riverbed dredging and construction work, as Four Major River Restoration Project. A series of bathymetry and near-river survey has been conducted to obtain the detailed terrain information for the study area. The properties related to the linear and cross-sectional characteristics of river channel have been calculated based on the filed survey data and analyzed with comparing the survey data obtained in 2012 for the project completion. Since there has not been enough time for meaningful terrain change to take place, it was not possible to extract special tendency in the degree and aspect of terrain change. However, it is necessary to make regular examinations to the patterns and degree of river channel change using the proposed methodology.

자연하천 유로의 선형과 단면 형상은 유수 흐름 및 유사이송과의 상호작용에 의해 시 공간적으로 연속적 변화를 거치게 된다. 본 연구에서는 4대강 살리기 사업을 통해 대규모 하상 준설과 시설물 공사가 이루어진 낙동강을 대상으로 인위적 변화가 가해진 유로의 형태학적 특성이 시간이 경과함에 따라 자연적으로 변화해가는 양상을 살펴보고 정량적으로 분석하고자 하였다. 이를 위해 강정고령보~달성보 구간에 대한 수심 및 하천측량을 실시하고 하도 단면의 기하학적 특성치와 유로 선형(곡률)을 지표로 4대강살리기 사업 완료 후 지형의 변화양상과 형태학적 특성을 파악하고자 하였다. 4대강살리기 사업 종료 후 유의미한 지형변화가 발생하기에는 충분한 시간이 경과하지 않았기에 지형변화의 정도와 양상에서 특별한 경향성을 추출할 수는 없었다. 하지만 본 연구에서 제안된 방법론을 활용한 지형특성 및 변화의 양상과 규모에 대한 지속적인 평가가 필요할 것으로 판단되는 바이다.

Keywords

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Fig. 1. Index map of study area

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Fig. 2. Field survey

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Fig. 3. Comparison of surveyed profiles (No. 326)

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Fig. 4. Comparison of surveyed profiles (No. 335)

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Fig. 5. Schematic for geometric properties of channel cross-section

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Fig. 6. Schematic for curvature calculation

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Fig. 7. Geometric properties for each section

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Fig. 8. Geomorphological features on section No. 345

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Fig. 9. Relationship between curvature and geometric properties

Table 1. Cross-sectional properties (No. 326)

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Table 2. Cross-sectional properties (No. 335)

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Table 3. Comparison of geometric properties from 2012 & 2017

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