HR: 16:45h
AN: H34B-04    [Abstracts]
TI: Integration of Hydrologic, Sediment Yield, Sediment Delivery, Hydrodynamic and Sediment Transport Models in Large Great Lakes Watersheds
AU: * Brunton, A
EM: abrunton@baird.com
AF: W.F. Baird & Associates Coastal Engineers Ltd., 627 Lyons Lane Suite 200, Oakville, ON L6J 5Z7 Canada
AU: Nairn, R
EM: rnairn@baird.com
AF: W.F. Baird & Associates Coastal Engineers Ltd., 627 Lyons Lane Suite 200, Oakville, ON L6J 5Z7 Canada
AU: Selegean, J
EM: James.P.Selegean@lre01.usace.army.mil
AF: USACE Detroit District, 477 Michigan Avenue, Detroit, MI 48226 United States
AB: Computational tools to evaluate surface and subsurface water flow and sediment transport are commonly used by environmental and engineering practitioners. However, different parts of the hydrologic system (e.g. hillslope overland flow, groundwater, river channel flow) are often treated separately and at disparate spatial and temporal scales. Overland flow models typically have no explicit channel representation and vice-versa, making integrated assessments of water and sediment delivery from catchment to channel difficult. This is problematic when appraising the influence of land use change (urbanization, modification of riparian buffer strips, changes in tillage and forestry practices etc.) on catchment sediment movement and river flood hydrographs. A 'budgetary' approach was taken to defining the sources and sinks of water and sediment within large catchments in the Great Lakes area under a variety of land uses. These budgets were derived from existing datasets including digital elevation models, river flow and sediment load records, and dam sedimentation surveys. Numerical models of watershed hydrology and sediment delivery, 2-D river flow and sediment transport were constructed to develop a general understanding of the hydrologic and geomorphic behavior of these systems, and to predict the effects of changing land use and riparian buffer zone modification. Models were calibrated against river flow and sediment transport records, reservoir sedimentation surveys and harbor dredging records. The challenges and benefits of combining these diverse approaches and their implementation in best management practices are discussed.
DE: 1803 Anthropogenic effects
DE: 1815 Erosion and sedimentation
DE: 1824 Geomorphology (1625)
DE: 1860 Runoff and streamflow
SC: Hydrology [H]
MN: 2004 AGU Fall Meeting