TY - GEN

T1 - Analysis of Interaction between Surface and Subsurface Flows Using Conjunctive 2-D Surface-3-D Subsurface Flow Model

AU - Morita, Masaru

PY - 2003/12/1

Y1 - 2003/12/1

N2 - This paper presents a conjunctive 2-D surface and 3-D subsurface flow model, which deals with the interaction between surface and subsurface flows. The model uses the non-inertia approximation of the Saint-Venant equations for two-dimensional unsteady surface flow and a modified version of the Richards equation for three-dimensional unsteady unsaturated and saturated subsurface flows. The equations are written in the form of 2-D and 3-D heat diffusion equations respectively. In the model the surface and subsurface flow components are coupled interactively using the common boundary condition of infiltration through the ground surface. Overland flow is generally classified into Hortonian and saturation overland flows in watershed hydrology. The conjunctive model was, after verification with experimental data, applied to a hypothetical watershed to simulate examples of 2-D saturation overland flow and 3-D saturated and unsaturated subsurface flow. The model demonstrates that overland flow is initiated when rainwater supply exceeds infiltrability, not only in Hortonian but even in saturation overland flow. The model also simulates overland flow, infiltration, seepage, subsurface flow, and the interaction between subsurface and channel flows. The conjunctive model, as a general model to deal with the interaction between surface and subsurface flows, contributes as a tool for improved detailed simulation of 2-D surface and 3-D subsurface flows and their interaction.

AB - This paper presents a conjunctive 2-D surface and 3-D subsurface flow model, which deals with the interaction between surface and subsurface flows. The model uses the non-inertia approximation of the Saint-Venant equations for two-dimensional unsteady surface flow and a modified version of the Richards equation for three-dimensional unsteady unsaturated and saturated subsurface flows. The equations are written in the form of 2-D and 3-D heat diffusion equations respectively. In the model the surface and subsurface flow components are coupled interactively using the common boundary condition of infiltration through the ground surface. Overland flow is generally classified into Hortonian and saturation overland flows in watershed hydrology. The conjunctive model was, after verification with experimental data, applied to a hypothetical watershed to simulate examples of 2-D saturation overland flow and 3-D saturated and unsaturated subsurface flow. The model demonstrates that overland flow is initiated when rainwater supply exceeds infiltrability, not only in Hortonian but even in saturation overland flow. The model also simulates overland flow, infiltration, seepage, subsurface flow, and the interaction between subsurface and channel flows. The conjunctive model, as a general model to deal with the interaction between surface and subsurface flows, contributes as a tool for improved detailed simulation of 2-D surface and 3-D subsurface flows and their interaction.

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M3 - Conference contribution

AN - SCOPUS:1642435364

SN - 0784406855

T3 - World Water and Environmental Resources Congress

SP - 1665

EP - 1674

BT - World Water and Environmental Resources Congress

A2 - Bizier, P.

A2 - DeBarry, P.

T2 - World Water and Environmental Resources Congress 2003

Y2 - 23 June 2003 through 26 June 2003

ER -