Storm water simulation: Modeling and analysis of a three-dimensional cloud

Abstract

A simulation of storm water is presented for developing a physical understanding of storm runoff from urban basins. A new three- dimensional cloud model simulates storm rainfall. The model contains nine prognostic equations: three momentum equations, pressure and thermodynamic equations, three moisture and water equations, and a subgrid kinetic energy equation. A par ticular coordinate transformation is used. It maps a simulation domain with an irregular lower boundary onto a rectangular domain. A finite difference scheme which conserves heat, mois ture, water substances, and subgrid-scale motion solves the trans formed equations. The rainfall is averaged in space and time for a basin to obtain the hyetograph. We use the Road Research Lab oratory Hydrograph method (the RRL method) to compute the storm runoff hydrograph for the basin from the hyetograph. A simulation result for a simplified atmospheric condition is presented.

Keywords

cloud model conservative property coordinate transformation finite difference scheme rainfall,RRL method runoff storm

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