HR: 0830h
AN: H21C-07    [Abstracts]
TI: The Analysis of Seasonally Varying Flow in a Crystalline Rock Watershed and Calibration of an Integrated Groundwater and Surface Water Model
AU: Sykes, J F
EM: sykesj@engmail.uwaterloo.ca
AF: University of Waterloo, 200 University Ave W, Waterloo, On N2L 3G1 Canada
AU: * Randall, J E
EM: jerandal@engmail.uwaterloo.ca
AF: University of Waterloo, 200 University Ave W, Waterloo, On N2L 3G1 Canada
AU: Normani, S D
EM: sdnorman@engmail.uwaterloo.ca
AF: University of Waterloo, 200 University Ave W, Waterloo, On N2L 3G1 Canada
AB: Minimal scientific knowledge is available to describe the interaction of surface water and groundwater flow systems within watersheds in the crystalline rock setting of the Canadian Shield. The surface water and groundwater flow in a small watershed are being investigated using the fully coupled groundwater / surface water model HydroSphere. The watershed has an area of 6.92 square kilometers and contains multiple lakes, the largest with a surface area of 0.94 square kilometers and a maximum depth of 9.0 meters. The surface water drainage system includes wetlands, small streams, and beaver dams while the topographic relief has a range of 50 meters. A bathymetric survey has been completed and lake circulation patterns have been determined for the small lake within the watershed using RMA2. The overburden is thin with granite bedrock outcrops occurring at numerous locations throughout the basin. The conceptual model for the subsurface system includes the surface sediments while three categories are used to characterize the bedrock with these being moderately fractured rock, sparsely fractured rock, and fracture zones. These categories are consistent with those used in the characterization of the crystalline rock at the Atomic Energy of Canada Limited (AECL) Underground Research Laboratory near Lac du Bonnet, Manitoba. ArcView GIS was used to facilitate data synthesis, analysis, and visualization. Data layers include orthophotos and a digital Ontario Base Map. Hydrologic data for the basin includes 2 rain gauges and a continuous water level recorder for the watershed's largest lake. Additional climate data were obtained from nearby meteorological stations. The HydroSphere model is based on the FRAC3DVS three-dimensional groundwater model and the MODHMS surface water simulator. HydroSphere was used to investigate and calibrate the parameters for groundwater and surface water flow in the basin for a spring to fall time period. Model output is compared to the observed continuous hydrologic record. The work provides a better understanding of model and physical parameters for integrated surface water / groundwater systems of watersheds in Canadian Shield settings. This research will contribute to the ongoing development of HydroSphere such that it can be applied to the analysis of a wide range of watersheds.
DE: 1818 Evapotranspiration
DE: 1829 Groundwater hydrology
DE: 1836 Hydrologic budget (1655)
SC: Hydrology [H]
MN: 2005 Joint Assembly