Surface Saturation Area-Subsurface Outflow-Soil Moisture Storage Relationships: II. Dynamic Analysis

지표포화지역-중간류유출-흙수분저류량 관계: II. 동적 분석

  • 이도훈 (정회원 경희대학교 공과대학 토목공학과) ;
  • 이은태 (정회원 경희대학교 공과대학 토목공학과)
  • Published : 1996.04.01

Abstract

The dynamic responses in the subsurface outflow, surface saturation area, soil moisture storage are established by numerical experiments with Richards equation. In addition to this, the dynamical relationship between surface saturation area and subsurface outflow, and between surface saturation area and soil moisture storage are also determined by varying the hillslope shape, soil type, and boundary condition. The simulation results indicate that the dynamical relationships between surface saturation area and subsurface outflow, and between surface saturation area and soil moisture storage are approximated by the steadystate relationships. And the dynamic responses of subsurface outflow and surface saturation area are characterized by the double peaks although the rainfall pattern is asimple pulse input. As a result of numerical simulation, the physical mechanism for the occurrence of the double peaks is explained using the concept of variable source area.

중간류 유출, 지표표화지역, 흙수분저류량들의 동적 반응을 Richards 방정식을 이용한 수치실험을 통하여 유도하였다. 그리고 수치실험에서 경사면 모양, 토양종류, 경계조건 등을 변화시켜서 지표포화지역-중간류유출 동적 관계 및 지표포화지역-흙수분저류량 동적 관계를 결정하였다. 모의결과에 의하면, 지표포화지역-중간류유출 동적 관계 및 지표포화지역-흙수분 저류량 동적 관계는 각 관계들의 정상류 관계에 의해 근사적으로 설명될 수 있다. 그리고 강우양상이 단순한 펄스입력일지라도 중간류유출 및 지표포화지역의 동적 반응은 중복첨두치에 의해 특징지어지며, 중복첨두치의 발생에 대한 물리적 메케니즘은 "variable source area"의 개념을 이용하여 설명하였다.용하여 설명하였다.

Keywords

References

  1. 한국수자원학회지 v.28 no.5 지표포화지역-중간류유출-흙수분저류량 관계: I. 정상류 분석 이도훈;이은태
  2. Water Resources Research v.26 no.4 Estimating steady infiltration rate times for infiltrometers Elrick, D.E.;Reynolds, W.D.;Geering, H.R.;Tan, K.A.
  3. Water Resources Research v.8 no.5 The role of subsurface flow in generating surface runoff: 2. Upstream source areas Freeze, R.A.
  4. Water Resources Research v.27 no.8 Dynamics of moving boundary overland flows over infiltrating surfaces at hillslopes Govindaraju, R.S.;Kavvas, M.L.
  5. Proceedings of the Symposium on Interdisciplinary Asepcts of Watershed Management The varying source area of streamflow from upland basins Hewlett, J.D.;Nutter, W.L.
  6. Principles of forest hydrology Hewlett, J.D.
  7. Physics v.1 Capillary conduction of liquids through porous mediums Richards, L.A.
  8. Process geomorphology Ritter, D.F.
  9. Soil Science Society of America Journal v.44 A closed-form equation for predicting the hydraulic conductivity of unsaturated soils van Genuchten, M.Th.
  10. ORNL-5567/R1 FEMWATER: A finite element model of water flow through saturated-unsaturated porous media-first revision Yeh, G.T.