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2025 Vol.26, Issue 1
Analysis of the Relationship between Surface Runoff and Rainfall Movement Direction and Velocity in Asymmetric Basin

비대칭유역에서 지표면유출과 강우의 이동방향 및 이동속도의 관계분석

Jinhyun Han1
,
Wonho Lee2
,
Yongsoo Cho3*
한 진현1
,
이 원호2
,
조 용수3*
1Division of Civil, Environmental & Urban-Transportation Engineering-Division of Civil Engineering, Korea National University of Transportation
2Division of Civil, Environmental & Urban-Transportation Engineering-Division of Civil Engineering, Korea National University of Transportation
3Dept. of Construction Safety & Disaster Prevention, Chungnam State University
*Corresponding Author
1 January 2025. pp. 5-19
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Abstract

As a study to analyze the characteristics of runoff through moving velocity, moving direction, rainfall distribution type, and basin shape, the basic theory was analyzed by applying kinematic wave equation. For the rainfall distribution type, uniform distribution type, advanced type, delayed type, and intermediate type were used, and only two types of movement Velocity was 1.25 m/s, and 10 m/s were used in consideration of the size of the model basin. At this time, the movement direction was analyzed in four directions: crossstream, downstream, upstream, and diagonalstream. The shape of the hydrograph, peak discharge, and peak time generated by the four rainfall distribution types passing through the asymmetric basin with regular intervals, such as square, oblong, and elongated models, were analyzed, and it was found that the basin model's shape has a significant impact on runoff. In the square type and the oblong type, a large peak flow rate appears in the downstream and crossstream directions, and the movement to the upstream direction appears faster in the outflow time, while the peak flow rate is smaller than in the downstream direction. Regardless of the moving velocity or rainfall distribution type, the peak flow rate in the downstream direction is large in the elongated type, and the peak time is found to be delayed for a long time.

Keywords
Moving rainfall
Asymmetric
Direction
Basin model

유출의 특성을 이동속도, 이동방향, 강우분포형, 유역형상 등을 통해 분석하고자 한 연구로서 기본이론은 운동파이론을 적용하여 분석하였다. 강우분포형은 균등분포형, 전진형, 지연형, 중앙집중형을 이용하였고, 이동속도는 모형유역의 크기를 고려하여 1.25m/s, 10m/s 2가지만을 사용하였다. 이때 이동방향은 횡방향, 하류방향, 상류방향, 대각선 방향 4가지 방향에 대하여 분석하였다. 4가지의 강우분포형이 정방형, 장방형, 신장형 등 3가지 형태의 모형유역을 일정한 간격을 가지고 있는 비대칭유역을 지나면서 발생되는 유출수문곡선의 모양과 첨두유량, 첨두시간을 분석하였고, 유역모형의 형태가 유출에 영향이 크다는 것으로 나타났다. 정방형과 장방형은 하류방향과 횡방향에서 큰 첨두유량이 나타나고 있으며, 상류방향으로의 이동은 유출시간이 빠르게 나타나는 반면 첨두유량은 하류방향보다 작게 나타났다. 신장형은 이동속도, 강우분포형에 상관없이 하류방향의 첨두유량이 크게 나타났고 첨두시간이 길게 지체되는 것으로 나타났다.

키워드
이동강우
비대칭
이동방향
모형유역
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Information
  • Publisher :Korean Geo-Environmental Society
  • Publisher(Ko) :한국지반환경공학회
  • Journal Title :Journal of the Korean Geo-Environmental Society
  • Journal Title(Ko) :한국지반환경공학회 논문집
  • Volume : 26
  • No :1
  • Pages :5-19
  • Received Date : 2024-08-20
  • Revised Date : 2024-08-22
  • Accepted Date : 2024-12-26
  • DOI :https://doi.org/10.14481/jkges.2025.26.1.5
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