不等距分层中尺度&#951;坐标暴雨模式的设计及数值试验

不等距分层中尺度η坐标暴雨模式的设计及数值试验

基金项目: 国家自然科学基金资助项目(49745007);中国气象局"两湖暴雨"课题;空司"中尺度暴雨η模式的研制"课题共同资助

摘要: 运用加权平均法构造垂直不等距差分格式,设计了16层不等距分层的中尺度η坐标暴雨模式。模式对地形的描述更加细致。对1998年6、7月降水集中的两个时段的降水进行了数值模拟试验,结果表明,不等距模式运行稳定,在暴雨预报方面比等距模式有显著提高。特别是暴雨的范围、中心位置及强度预报得更好,虚假暴雨区大大缩小。
- η /
- 坐标 /
- 不等距分层 /
- 数值试验
Abstract: A vertical varying-distance difference scheme is constructed using weighted mean,and a varying-distance layers 16-level Eta-coordinate mesoscale rainstorm model is designed.The model topography is particularly fine. For rainfall that concentrate on June and July,1998,numerical simulation is done using the model.The results show that the model is stable,and the forecast of rainstorm using varying-distance model has notable progress. In particular,the range and center location and intensity of rainstorm are well forecast,and the range of false rainstorm is greatly reduced.
- Eta-coordinate /
- varying-distance layers /
- numerical simulation /

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