The Analysis of Seasonally Varying Flowin a Crystalline Rock Watershed Using anIntegrated Surface Water andGroundwater Model

Civil & Environmental Engineering;Integrated Model;HydroGeoSphere;Groundwater;Surface Water;Bass Lake

Randall, Jefferey

University of Waterloo

关键词: Civil & Environmental Engineering;    Integrated Model;    HydroGeoSphere;    Groundwater;    Surface Water;    Bass Lake;   

Others  :  https://uwspace.uwaterloo.ca/bitstream/10012/852/1/jerandal2005.pdf

瑞士|英语

来源: UWSPACE Waterloo Institutional Repository

【 摘 要 】

Researchers, explorers, and philosophers have dedicated many lifetimes attempting todiscover, document, and quantify the vast physical processes and interactions occurring innature. Our understanding of physical processes has often been reflected in the form ofnumerical models that assist academics in unraveling the many complexities that exist in ourphysical environment. To that end, integrated surface water-groundwater models attempt tosimulate the complex processes and relationships occurring throughout the hydrologic cycle,accounting for evapotranspiration and surface water, variably saturated groundwater, andchannel flows.

The Bass Lake watershed is located in the Muskoka district of Ontario, within a crystallinerock environment consistent with typical Canadian Shield settings. Numerous data collectionprograms and methods were used to compile environmental and field-scale datasets. Theintegrated surface water-groundwater model, HydroGeoSphere (Therrien et al., 2005), wasused for all Bass Lake watershed simulation models.

Simulation results were compared to expected trends and observed field data. Thegroundwater heads and flow vector fields show groundwater movement in expecteddirections with reasonable flow velocities. The subsurface saturation levels behave asexpected, confirming the evapotranspiration component is withdrawing groundwaterduring plant transpiration. The surface water depths and locations of water accumulationare consistent with known and collected field data. The surface waters flow in expecteddirections at reasonable flow speeds. Simulated Bass Lake surface elevations werecompared to observed surface water elevations. Low overland friction values producedthe most accurate Bass Lake elevations, with high overland friction values slightlyoverestimating the Bass Lake water level throughout the simulation period. Fluidexchange between surface water and groundwater domains was consistent with expectedflux rates. The integrated surface water-groundwater model HydroGeoSphere ultimatelyproduced acceptable simulations of the Bass Lake model domain.