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3-D Circulation Modeling for Potential Ocean Tidal Turbine Site
The ASL-COCIRM numerical model used in this study is a full
three-dimensional circulation model. The 3-D model was used to simulate the water flows and water levels through Canoe Pass if the dam were completely removed and replaced by a 40 m wide passage between Quadra and Maude Islands.
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Preliminary Modeling of Cooling Water discharge to Lake Izabal, Guatemala
Klohn Crippen Consultants contracted ASL to do the preliminary assessment of the effects of the cooling water discharge into the northwest sector of Lake Izabal, Guatemala. ASL's 3D-COCIRM model was run with a 150m by 150m grid size over the full domain of Lake Izabal (20 x 40 km in size). For the area of the cooling water discharge canal, a nested grid having a higher resolution of 10m by 10m was applied. The model was operated for various combinations of winds, cooling water discharges and inflows from the Rio Polochic, the major river tributary to Lake Izabal from the west.
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Ocean Wave Modeling
ASL’s numerical modeling group now has the capability of doing ocean wave modeling using SWAN (Simulating WAves Nearshore). SWAN is a numerical wave model that obtains realistic estimates of wave parameters in coastal areas, given wind, bottom, and current conditions. SWAN is a nested grid, high-resolution model used to resolve bottom or structures in near shore areas (rigs, terminals). ASL has applied SWAN nearshore off the west coast of Vancouver Island, BC and the results have been successfully compared to wave measurement stations in the area.
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Modeling Burrard Thermal Generating Station Cooling Water Re-circulation
Another recent application of COCIRM-ASL was simulation of the circulation and thermodynamics (Jiang, ea al., 2001) associated with the cooling water discharge of the Burrard Thermal Generating Station in the Port Moody Arm, BC, Canada (Figures 4 and 5). This cooling water into the Arm takes the form of a submerged horizontal heated jet at 6 m below MSL. The model was calibrated and validated using the field data of dye tracing and thermal plume surveys. The nested sub-grid model represented the heated buoyant jet appropriately. The model successfully reproduced the resulting circulation and thermal plume in the Arm.
Port Moody Arm is dominated by tidal processes and has extensive mudflats, which are dry at low tide. The effects of the mud flats were explicitly incorporated into this adaptation of ASL-COCRIM. |
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Columbia/ Pend d’Oreille Rivers
The first version of the ASL River 3-D numerical model was developed and tested for the area of the Columbia River downstream of the Keenleyside Dam.
This model was further developed and refined for a modeling application now underway for the Waneta Expansion Project. This modeling study is being conducted in the Waneta area at the confluence of the Columbia and Pend d’Oreille rivers. This area has some very significant morphological and circulation features.
The modeling incorporates historical bathymetric and flow data from the mid 1990’s and recently acquired data sets collected as part of Waneta Expansion Project studies in the summer and fall of 2001.
This 3-D very high resolution numerical model for the Waneta area is operated on a Pentium IV 1.9 Ghz computer. A typical model run requires about 20 hours of dedicated computer time.
This case study of a 3-D finite difference numerical model illustrates the overall capability of advanced numerical hydrodynamic models for complex riverine flow applications. The numerical model indicates that the inertial effect and horizontal turbulent diffusion are the dominant physical factors causing the eddies downstream of the Keenleyside Dam.
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