Numerical Simulation of Drainage Flow in Brush Creek, Colorado

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Abstract
One of the objectives of the Atmospheric Studies in Complex Terrain (ASCOT) program is to develop numerical models that can be used to aid in the understanding and prediction of flow patterns observed over complex terrain. As part of this program, we have developed a three-dimensional dynamic model that uses a simplified finite element scheme combined with a variation of the forward Euler time integration scheme to solve the Boussinesq equations of motion over irregular terrain. We have used the model to simulate the development of nocturnal down-valley circulation in the area where the ASCOT field observations were made at Brush Creek, Colorado. The model and the simulation results are described in this paper.

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