A FLASH-FLOODING STORM AT THE STEEP EDGE OF HIGH TERRAIN Disaster in the Himalayas
A FLASH-FLOODING STORM AT THE STEEP EDGE OF HIGH TERRAIN Disaster in the Himalayas
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DOI：
10.1175/bams-d-11-00236.1
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发表时间：
2012-11-01
影响因子：
8
通讯作者：
Houze, Robert A., Jr.
中科院分区：
文献类型：
--
作者：
Rasmussen, Kristen L.;Houze, Robert A., Jr.
在喜马拉雅山脉或落基山脉等高地形边缘发生的山洪暴发尤其危险，而且很难预测。2010年发生在印度喜马拉雅高原边缘的列城洪水就是这类风暴悲剧性后果的一个例子。一股偏东的中层急流与印度北部上空的中层季风涡旋和亚洲上空的高压有关，帮助对流组织成传播中尺度系统，并移动到高原边缘。第三天，离开高原的中尺度系统突然吸收了地形上方上坡流动的水汽，大大增强了活力。它从列城附近吸收的湿气中获得了最大的力量，大雨席卷了周围的山脉，并席卷了整个城镇。
Flash floods on the edge of high terrain, such as the Himalayas or Rocky Mountains, are especially dangerous and hard to predict. The Leh flood of 2010 at the edge of the Himalayan Plateau in India is an example of the tragic consequences of such storms. The flood occurred over a high mountain river valley when, on three successive days, diurnally generated convective cells over the Tibetan Plateau gathered into mesoscale convective systems and moved off the edge of the Plateau over Leh. An easterly midlevel jet associated with a midlevel monsoon vortex over northern India and a high over Asia helped the convection organize into propagating mesoscale systems that moved over the edge of the Plateau. On the third day the mesoscale system moving off the plateau was greatly invigorated when it suddenly drew on moisture flowing upslope over the terrain. It gained maximum strength from this intake of moisture near Leh, and the heavy rains washed over the surrounding mountains and down and over the town.