10/27/2022 0 Comments Cloudburst uttarakhand![]() ![]() In addition he provided people's perspective, mechanism and impact of cloudburst over the Central Himalayas. ![]() Joshi (1997) has reported damage in the two of the river basins in Garhwal Himalayas due to cloudburst occurrence during 1997 monsoon. Sah and Mazari (2007) reported occurrence of most of these cloudburst events mainly during the monsoonal periods, restricting over mainly headwater areas of closed tributaries/valleys. But the study mentions that the orographic architecture of the mountain regions makes them ideal for generating localized cyclonic storms in the confines of a closed valley which lead to cloudbursts. This study remains limited to associated flash flood, geomorphic details and impacts etc. (2013) have studied the cloudburst event of occurred over the Asi Ganga, a tributary of the Bhagirathi river, in Garhwal Himalayas. Joshi and Kumar (2006) based on four years precipitation analysis over the Ukhimath region of the central Himalayan has shown increase in such extreme events. Corresponding droplet size ranges from ~ 4–6 mm with fall speed of ~ 10 m/s (Singh and Sen 1996). In a very short time span over a much localized area heavy downpour ranging from 200 to 1000 mm/h occurs in these events (Deoja et al. Upadhyay (1995) suggested most of these events in mountainous regions are associated with cumulonimbus or thunder clouds. (2006) have provided an insight of a cloudburst event and associated dynamical interactions with the topography. (2014) have extensively provided signature of large scale flow and topographic interactions associated with Leh cloudburst event, 2010. Rasmussen and Houze (2012) and Kumar et al. 2012) to the observations studies (Gupta et al., 2013, Juyal, 2010) and to the modelling studies (Thayyen et al., 2012, Kumar et al., 2012). Various researchers have worked on case base studies associated with the cloudburst events right from reconstruction from geomorphic signature of the hindcast case (Hobley et al. Predicting the location, amplitude and magnitude of such catastrophic events in advance remains a challenge. The Himalayan orography with its steep and unstable inclines forms a perfect platform for such a cloudburst event to lead to flash floods or landslides. Most of these cases are associated with unexpected heavy precipitation. In the recent decades vagaries associated with ‘cloudburst’ events are frequently reported in and around the southern rim of the Indian Himalayas. These interactions in the present paper established the vagaries associated with the cloudburst events. Amiss of any one of these mechanisms will not lead the cloudburst mechanism to form. These intertwined mechanisms lead cloudburst events to form. ![]() Apart from some of the large scale flow shown by few of the studies, it is found that cloudburst events are convectively triggered followed by orographically locked systems. Most of the cloudburst events are seen occurring in the elevation range of 1000 m to 2500 m within the valley folds of the southern rim of the Indian Himalayas. ![]() Thus in the present work, characterizations and impacts of cloudburst leading from precipitation to dynamical to thermodynamical to large scale forcings to orographical forcings to followed geomorphology to impacts are intertwined to present comprehensive portray of it. Present paper synthesizes the available information and research on cloudburst events and tries to define it based on associated dynamics, thermodynamics and physical processes leading to a cloudburst event. There are a very few studies carried out on understanding of these events. Except this understanding and India Meteorology Department (IMD) definition of > 100 mm/h precipitation over a geographical region of approximately 20–30 km 2, nothing much else is known about these events. The principal understanding of the cloudburst is associated with sudden heavy deluge of precipitation in very less time interval over a very small area. In addition, they are mostly associated with flash floods as an impact of the torrential precipitation. Most of these events are reported once their affect in terms of loss to life and property is experienced in the downstream habitats. Most of the reported cloudbursts are in the interior of the Himalayas and hence their observation itself is limited. Cloudbursts in and around the southern rim of the Indian Himalayas are elusive in terms of their position and time of occurrences. ![]()
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