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摘要
The application and extension of the role of morphometry in riverine hazards in the Eastern Himalaya is rarely examined. In other regions, several researchers have explained the relation between morphometry and basin behaviour based on the basic physical principles of hydro-geomorphic activities. In this work, these relationships and their explanations are used in order to actualize the role of morphometry in riverine hazards of Gaurang, a basin in the Eastern Himalaya. Morphometric analysis of the Gaurang basin shows that intrabasin variations are caused by changes in topography, soil and vegetation cover. In this area, slope and vegetation dominate the upper hills and Dooars, whereas lithology dominates the lower alluvial plains. Hydro-geomorphic characterization of the entire basin highlights annual recurrence of high floods particularly inundating two major pockets in the lower portion of Gaurang. Stage hydrograph shows that after attainment of the peak, it takes 6-8 days to return to base level indicating sustained flood. The analysis of morphometric parameters in terms of actualizing its role in hydro-geomorphic behaviour of the basin clearly points out its significant contribution in accentuating the flooding and associated riverine hazards in the basin of this river in Eastern Himalaya.
- 出版日期2016-3
