Comparison of Spatial Pattern and Mechanism between Convexity and Gap Winds
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- Nishi Akifumi
- Graduate School of Life and Environmental Sciences, University of Tsukuba
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- Kusaka Hiroyuki
- Center for Computational Sciences, University of Tsukuba
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説明
<p>This study uses a numerical model to examine how a convex feature and a gap feature in a mountain range affect the leeward wind field. In the “convexity case”, the mountain ridge has a convex feature (viewed from above). In the “gap case”, the mountain ridge has a gap. The results show that both cases have local winds at the surface exceeding 8 m s−1, and both have similar spatial flow-patterns. However, the momentum budgets at the strong-wind regions differ between the cases. In the convexity case, the downdrafts are important in the momentum balance, whereas in the gap case, both the downdrafts and the pressure-gradient force are important. Thus, although their spatial patterns of surface wind are similar to each other, their mechanisms for producing a strong local wind differ.</p><p>Sensitivity experiments of Frm show that strong-wind appears in both the convexity and gap cases when Frm is between 0.42 and 1.04. In contrast, when Frm is 0.21, strong winds only appear in the gap case because the flow can go around the gap. When Frm exceeds 1.25, strong surface winds appear in the entire leeward plain.</p>
収録刊行物
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- SOLA
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SOLA 15 (0), 12-16, 2019
公益社団法人 日本気象学会
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詳細情報 詳細情報について
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- CRID
- 1390845713052363392
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- NII論文ID
- 130007596156
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- NII書誌ID
- AA12022899
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- ISSN
- 13496476
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- HANDLE
- 2241/00155473
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- 本文言語コード
- en
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- 資料種別
- journal article
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- データソース種別
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- JaLC
- IRDB
- Crossref
- CiNii Articles
- OpenAIRE
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- 抄録ライセンスフラグ
- 使用不可
