HR: 15:25h
AN: H22G-07    [PDF]
TI: Integrated Modeling of Infiltration, Evapotranspiration, Recharge, Subsurface Flow, Surface Runoff, and River Flow with First Principle, Physics-based Approaches
AU: * Yeh, G
EM: gyeh@mail.ucf.edu
AF: University of Central Florida, 4000 Central Florida Blvd, Orlando, FL 32816 United States
AU: Cheng, H
EM: Hwai-Ping.Cheng@erdc.usace.army.mil
AF: Coastal and Hydraulic Laboratory, US Army Engineer Resarch and Development Center, 3990 Halls Ferry Road, Vicksburg, MS 39180 United States
AU: Lin, H
EM: Hsin-chi.J.Lin@erdc.usace.army.mil
AF: Coastal and Hydraulic Laboratory, US Army Engineer Resarch and Development Center, 3990 Halls Ferry Road, Vicksburg, MS 39180 United States
AU: Zhang, F
EM: fzhang@pegasus.cc.ucf.edu
AF: University of Central Florida, 4000 Central Florida Blvd, Orlando, FL 32816 United States
AU: Edris, E V
EM: Earl.V.Edris@erdc.usace.army.mil
AF: Coastal and Hydraulic Laboratory, US Army Engineer Resarch and Development Center, 3990 Halls Ferry Road, Vicksburg, MS 39180 United States
AU: Richards, D R
EM: David.R.Richards@erdc.usace
AF: Coastal and Hydraulic Laboratory, US Army Engineer Resarch and Development Center, 3990 Halls Ferry Road, Vicksburg, MS 39180 United States
AB: Over the past 30 years, progress in the development of physics-based models for individual processes of infiltration, evapotranspiration, recharge, moisture redistribution in vadose zone, groundwater flow, surface runoff, and river flow has been remarkable. However, these individual processes are continuously and dynamically coupled over various spatial and temporal scales. In the past, each individual process was often investigated assuming other coupling and influencing processes were a priori. For example, to model overland flow (surface runoff), it was often implicitly assumed that the infiltration was known and the feedback from groundwater flow and river flow were not explicitly enforced. Integrated approaches to modeling coupled processes have gained momentum recently. Many integrated models have achieved the coupling via external or internal linkage of individual process-level models. As a result, these models often have to introduce undue empiricism. This paper presents the development of an integrated numerical model of the aforementioned processes. A rigorous coupling of these hydrological processes is achieved with the first principle approach by imposing the continuity of volumetric fluxes and state variables. In this integrated model, any process between two media is the natural consequence of interaction and feedback between processes occurring in the media. For example, infiltration and recharge are spatially and temporally varied and are the consequence of interacting flow processes on the land surface (overland) and in the subsurface media and rivers. Numerical implementations of the theoretical coupling are thoroughly discussed. Several example problems will be used to demonstrate theoretical and application aspects of this model. Key Words: Infiltration, Evapotranspiration, Recharge, Surface Runoff, Groundwater Flow, River Flow, Numerical Model
DE: 1818 Evapotranspiration
DE: 1829 Groundwater hydrology
DE: 1860 Runoff and streamflow
DE: 1866 Soil moisture
DE: 1875 Unsaturated zone
SC: Hydrology [H]
MN: 2003 Fall Meeting