HR: 11:05h
AN: H42B-04 INVITED     [Abstracts]
TI: Comprehensive Representation of Hydrologic and Geomorphic Process Coupling in Numerical Models: Internal Dynamics and Basin Evolution
AU: * Istanbulluoglu, E
EM: erkan2@unl.edu
AF: Departments of Geosciences and Biological Systems Engineering University of Nebraska-Lincoln, 200 Bessey Hall, Lincoln, NE 68588 United States
AU: Vivoni, E R
EM: vivoni.nmt.edu
AF: Department of Earth and Environmental Sciences New Mexico Institute of Mining and Technology, 801 Leroy Place, MSEC 244, Socorro, NM 87801 United States
AU: Ivanov, V Y
EM: viva@mit.edu
AF: Department of Civil and Environmental Engineering Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, MA 02139 United States
AU: Bras, R L
EM: rlbras@mit.edu
AF: Department of Civil and Environmental Engineering Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, MA 02139 United States
AB: Landscape morphology has an important control on the spatial and temporal organization of basin hydrologic response to climate forcing, affecting soil moisture redistribution as well as vegetation function. On the other hand, erosion, driven by hydrology and modulated by vegetation, produces landforms over geologic time scales that reflect characteristic signatures of the dominant land forming process. Responding to extreme climate events or anthropogenic disturbances of the land surface, infrequent but rapid forms of erosion (e.g., arroyo development, landsliding) can modify topography such that basin hydrology is significantly influenced. Despite significant advances in both hydrologic and geomorphic modeling over the past two decades, the dynamic interactions between basin hydrology, geomorphology and terrestrial ecology are not adequately captured in current model frameworks. In order to investigate hydrologic-geomorphic-ecologic interactions at the basin scale we present initial efforts in integrating the CHILD landscape evolution model (Tucker et al. 2001) with the tRIBS hydrology model (Ivanov et al. 2004), both developed in a common software environment. In this talk, we present preliminary results of the numerical modeling of the coupled evolution of basin hydro-geomorphic response and resulting landscape morphology in two sets of examples. First, we discuss the long-term evolution of both the hydrologic response and the resulting basin morphology from an initially uplifted plateau. In the second set of modeling experiments, we implement changes in climate and land-use to an existing topography and compare basin hydrologic response to the model results when landscape form is fixed (e.g. no coupling between hydrology and geomorphology). Model results stress the importance of internal basin dynamics, including runoff generation mechanisms and hydrologic states, in shaping hydrologic response as well as the importance of employing comprehensive conceptualizations of hydrology in modeling landscape evolution.
DE: 1804 Catchment
DE: 1805 Computational hydrology
DE: 1815 Erosion
DE: 1821 Floods
DE: 1824 Geomorphology: general (1625)
SC: Hydrology [H]
MN: Fall Meeting 2005