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首页> 外文期刊>Natural Hazards >Response of west Indian coastal regions and Kavaratti lagoon to the November-2009 tropical cyclone Phyan.
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Response of west Indian coastal regions and Kavaratti lagoon to the November-2009 tropical cyclone Phyan.

机译：印度西部沿海地区和卡瓦拉蒂泻湖对2009年11月热带气旋“ Phyan”的反应。

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摘要

Response of the coastal regions of eastern Arabian Sea (AS) and Kavaratti Island lagoon in the AS to the tropical cyclonic storm 'Phyan', which developed in winter in the south-eastern AS and swept northward along the eastern AS during 9-12 November 2009 until its landfall at the northwest coast of India, is examined based on in situ and satellite-derived measurements. Wind was predominantly south/south-westerly and the maximum wind speed (U10) of ~16 m/s occurred at Kavaratti Island region followed by ~8 m/s at Dwarka (Gujarat) and ~7 m/s at Diu (located south of Dwarka) as well as two southwest Indian coastal locations (Mangalore and Malpe). All other west Indian coastal sites recorded maximum wind speed of ~5-6 m/s. Gust factor (i.e., gust-to-speed ratio) during peak storm event was highly variable with respect to topography, with steep hilly stations (Karwar and Ratnagiri) and proximate thick and tall vegetation-rich site (Kochi) exhibiting large values (~6), whereas Island station (Kavaratti) exhibiting ~1 (indicating consistently steady wind). Rainfall in association with Phyan was temporally scattered, with the highest 24-h accumulated precipitation (~60 mm) at Karwar and ~45 mm at several other west Indian coastal sites. Impact of Phyan on the west Indian coastal regions was manifested in terms of intensified significant waves (~2.2 m at Karwar and Panaji), sea surface cooling (~5 degrees C at Calicut), and moderate surge (~50 cm at Verem, Goa). The surface waves were south-westerly and the peak wave period (Tp) shortened from ~10-17 s to ~5-10 s during Phyan, indicating their transition from the long-period 'swell' to the short-period 'sea'. Reduction in the spread of the mean wave period (Tz) from ~5-10 s to a steady period of ~6 s was another manifestation of the influence of the cyclone on the surface wave field. Several factors such as (1) water piling-up at the coast supported by south/south-westerly wind and seaward flow of the excess water in the rivers due to heavy rains, (2) reduction of piling-up at the coast, supported by the upstream penetration of seawater into the rivers, and (3) possible interaction of upstream flow with river run-off, together resulted in the observed moderate surge at the west Indian coast. Despite the intense wind forcing, Kavaratti Island lagoon experienced insignificantly weak surge (~7 cm) because of lack of river influx and absence of a sufficiently large land boundary required for the generation and sustenance of wave/wind-driven water mass piling-up at the land-sea interface.Digital Object Identifier http://dx.doi.org/10.1007/s11069-010-9613-7
机译：东南部阿拉伯海（AS）和卡瓦拉蒂岛泻湖沿岸地区对热带气旋风暴“ Phyan”的反应，该飓风在冬季在东南AS冬季发展，并于11月9日至12日沿着东AS向北掠过根据原位和人造卫星的测量结果，对2009年直到其登陆印度西北海岸的土地进行了检查。风主要是南/西南偏西，最大风速（U 10 ）在卡瓦拉蒂岛地区为〜16 m / s，随后在Dwarka（古吉拉特邦）为〜8 m / s，〜7 Diu（位于Dwarka南部）和印度西南部两个沿海位置（Mangalore和Malpe）的m / s。印度西部所有其他沿海站点记录的最大风速约为5-6 m / s。高峰风暴事件期间的阵风因子（即阵风速比）相对于地形变化很大，陡峭的丘陵站（Karwar和Ratnagiri）以及附近厚而高的植被丰富的地点（高知）表现出较大的值（〜 6），而岛屿站（Kavaratti）则显示〜1（始终表示稳定的风）。与Phyan相关的降雨在时间上是分散的，Karwar的24小时累积降水量最高（〜60 mm），而印度西部其他沿海站点的降水量最高约为45 mm。 Phyan对印度西部沿海地区的影响表现为强烈的强烈波（在Karwar和Panaji处约2.2 m），海面冷却（在Calicut处约5摄氏度）和中等浪涌（在Vera，果阿处约50 cm） ）。在Phyan期间，表面波向西南方向移动，峰值波周期（ T p ）从〜10-17 s缩短为〜5-10 s，表明它们从长期的“膨胀”到短期的“海”。平均波周期（ T z ）的扩展从〜5-10 s减小到稳定时间〜6 s是旋风影响的另一个体现在表面波场上。几个因素，例如（1）沿南/西南风吹倒海岸的水，以及由于暴雨而使河流中多余的水向海流动，（2）减少沿海岸的水的聚积（3）上游水流与河流径流的可能相互作用，共同导致印度西部沿海地区出现适度的激增。尽管有强烈的强风作用，但由于没有河涌入以及没有足够大的陆地边界来产生和维持波浪/风力驱动的水体堆积，卡瓦拉蒂岛泻湖的浪涌微弱（约7厘米）。陆海界面。数字对象标识符http://dx.doi.org/10.1007/s11069-010-9613-7

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