Modeling heavy precipitation in complex terrain |
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| Authors: | Prof Dr D F Tucker Dr E R Reiter |
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| Institution: | (1) Present address: Department of Atmospheric Science, Colorado State University, 80523 Fort Collins, Colorado, USA;(2) Center for Cybernetic Communication Research (3CR), Colorado State University, 80523 Fort Collins, Colorado, USA |
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| Abstract: | Summary A numerical prediction model is described which uses the full set of prognostic equations on a domain roughly the size of the United States with a 96 km horizontal grid resolution and six sigma-coordinate levels. Within this grid resides a nested domain of approximately 1000×1000 km with 24 km horizontal resolution. In this nested grid only modifications to the wind field by the better resolved terrain are considered on the lowest two sigma levels. The terrain effects necessitate adjustments in the location of these two sigma levels. Adjusted wind fields cause modifications in the mass and moisture divergence fields, hence in precipitation. These modifications are averaged into the appropriate meteorological fields on the larger grid.The algorithms used by our model allow continuous interaction between both grids with high computational efficiency.The relative importance of synoptic forcing and terrain is demonstrated for the cases of the Big Thompson, Colorado, flood of 1976 and the Cheyenne, Wyoming, flood of 1985.With 15 Figures |
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