...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Numerical simulations of local winds over steep orography in the storm over north Norway on October 12, 1996
【24h】

Numerical simulations of local winds over steep orography in the storm over north Norway on October 12, 1996

机译：1996年10月12日挪威北部风暴中陡峭地形上局部风的数值模拟

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Some power pylons (30 m high) broke down in a storm over north Norway in October 1996. The pylons were situated in a short, narrow valley (3 km long) surrounded by mountains reaching 600 - 850 m. The pylons fell in a direction opposite to the main southwesterly winds, and it is likely that the damage was caused by wind gusts of more than 50 m s~(-1). High-resolution simulations with the nonhydrostatic numerical model MEMO have been made to investigate the local winds. Initial conditions have been taken from successful limited-area synoptic-scale predictions of the damaging storm. For upstream southwesterly wind, leeside bluff separation was simulated in the valley. The recirculation filled the valley in a flow organized like a corkscrew down the valley. In the bottom of the valley the recirculation formed a return jet with a maximum wind speed between 17 and 20 m s~(-1) in the different simulations, and with a considerable component toward the separation line at the ground, downstream from the mountaintops on the southern side of the valley. The axis of the corkscrew was found at 0.4 of the valley height. A veering of the initial upstream wind direction of 20 deg changed the flow to be steered up the valley, with a shallow recirculation confined to the southern side of the valley only. The turbulence in the recirculation area was found to be large, and it is argued that the wind gusts in the southwesterly case might reach values 3 times the mean wind speed.
机译：1996年10月，一些动力塔（高30 m）在挪威北部的一场暴风雨中破裂。这些塔位于一个短而狭窄的山谷（长3公里）中，周围环绕着达600至850 m的山脉。塔架的方向与主要西南风相反，并且损坏可能是由超过50 m s〜（-1）的阵风引起的。使用非静力学数值模型MEMO进行了高分辨率模拟，以研究局部风。初始条件来自对破坏性风暴成功的有限区域天气尺度的预测。对于上游的西南风，在山谷中模拟了背风侧虚张声势分离。回流以像开瓶器一样的流向山谷填充了整个山谷。在谷底，在不同的模拟中，再循环形成了最大风速在17到20 ms〜（-1）之间的回射流，并且向着地面上的分离线（山顶下游）具有相当大的分量。山谷的南侧。发现开瓶器的轴位于谷底高度的0.4。初始上游风向为20度的转向改变了将气流引向山谷的方向，仅在山谷的南侧限制了浅流。发现回流区的湍流很大，据认为西南风的阵风可能达到平均风速的三倍。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号