Use of Mass Conservation and Critical Dividing Streamline concepts for Efficient Objective Analysis of Winds in Complex Terrain.
暂无分享,去创建一个
Abstract Observed winds and temperature profiles can be used to generate three-dimensional, mass-conserving wind fields that reflect topographical influences. The concept of critical dividing streamlines is used to define quasi-horizontal, flow-confining two-dimensional surfaces. Adjustment toward two-dimensional nondivergence on those surfaces forces flow around obstacles under stable conditions when some flow surfaces intersect higher terrain features. Unlike most mass-conserving wind models, the approach described here includes objective evaluation of the effects of atmospheric stability. Efficiency is achieved by casting the three-dimensional problem as several two-dimensional problems and by using an iterative scheme to adjust toward nondivergence. A 20 × 20 × 5 gridpoint analysis requires approximately 2 min on an IBM-AT personal computer.