한국수자원학회논문집 (Journal of Korea Water Resources Association)

  • 제45권1호
  • /
  • Pages.39-52
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  • 2012
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  • 2799-8746(pISSN)
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  • 2799-8754(eISSN)
한국수자원학회 (Korea Water Resources Association)
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대도시 복합유역의 지표 및 지표하 유출해석기법 개발 (I)- 이론 및 모듈의 개발 -

A Development of Method for Surface and Subsurface Runoff Analysis in Urban Composite Watershed (I) - Theory and Development of Module -

  • 곽창재 (금오공과대학교 대학원 토목공학과) ;
  • 이재준 (금오공과대학교 토목환경공학부)
  • Kwak, Chang-Jae (School. of Civil Engrg., Kumoh National Institute of Technology) ;
  • Lee, Jae-Joon (School. of Civil and Environmental Engrg., Kumoh National Institute of Technology)
  • 투고 : 2011.07.27
  • 심사 : 2011.11.16
  • 발행 : 2012.01.31
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초록

유역내에서 발생하는 유출은 지표 유출과 지표하 유출이 있으며, 서로 상호작용 상태를 유지하게 된다. 일반적으로 지표와 지표하 둘 중 한 가지 알고리즘으로 해석이 힘든 유역에 대해 지표와 지표하 사이의 동적인 관계를 상세하게 모의해야 하는 경우 상호작용에 관한 요소를 고려하여야 한다. 동적인 상호작용 시스템의 구동에서는 시 공간적인 매개변수가 중요하며, 적절한 모의를 위해시 공간적인 매개변수는 시스템 상에서 지표와 지표하 항에 대한 복합적인 메카니즘으로 구성되어야 한다. 본 연구에서는 이러한 지표 및 지표하 유출의상호작용에 관한 알고리즘을 위해 2차원 확산파 방정식을 이용하여 지표 유출을 해석하고, Darcy의 법칙과 Dupuit-Forchheimer의 가정을 이용한 Boussinesq 방정식을 적용하여 포화상태의 지표하 유출의 알고리즘을 구성하였다. 커플링 방정식으로 공간에 대해서는 유한체적법을 사용하고, 시간에 대해서는 Crank-Nicolson 방법을 이용하였으며, 지표와 지표하 흐름의 상호작용에 대해서는 질량보존의 법칙에 기반하여 구성하였다. 이상의 과정을 통하여 지표 유출해석, 지표하 유출해석, 상호작용, 수치해석 부분의 4가지 주요 모듈을 만들었으며, 4가지 주요 모듈을 통합하여 복합유역의 지표 및 지표하 유출해석 모듈을 개발하였다.

Surface-subsurface interactions are an intrinsic component of the hydrologic response within a watershed. In general, these interactions are considered to be one of the most difficult areas of the discipline, particularly for the modeler who intends simulate the dynamic relations between these two major domains of the hydrological cycle. In essence, one major complexity is the spatial and temporal variations in the dynamically interacting system behavior. The proper simulation of these variations requires the need for providing an appropriate coupling mechanism between the surface and subsurface components of the system. In this study, an approach for modelling surface-subsurface flow and transport in a fully intergrated way is presented. The model uses the 2-dimensional diffusion wave equation for sheet surface water flow, and the Boussinesq equation with the Darcy's law and Dupuit-Forchheimer's assumption for variably saturated subsurface water flow. The coupled system of equations governing surface and subsurface flows is discretized using the finite volume method with central differencing in space and the Crank-Nicolson method in time. The interactions between surface and subsurface flows are considered mass balance based on the continuity conditions of pressure head and exchange flux. The major module consists of four sub-module (SUBFA, SFA, IA and NS module) is developed.

키워드

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