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Queen’s University Kingston (1998)

Erosion and sedimentation in the Phewa Tal Watershed, Middle Mountain Region, Nepal

Ross, James Donald

Titre : Erosion and sedimentation in the Phewa Tal Watershed, Middle Mountain Region, Nepal

Auteur : Ross, James Donald

Université de soutenance : Queen’s University Kingston, Ontario Canada

Grade : Master of Science 1998

Résumé
A watershed-scale approach was employed to assess the dynamics of erosion and sediment transport in the Phewa Tal Watershed, as well as rates and processes of sedimentation within Phewa Tal, a reservoir located in the Middle Mountain Region of Nepal. Monitoring of the mainstem river (the Harpan Khola) and the lake water column indicated that the monsoon season is a time of peak geomorphic activity in the watershed. Sediment loads to the reservoir at this time were over two orders of magnitude greater than during the dry season. Significant erosional events were observed both during the pre-monsoon and monsoon seasons, with transported sediment distributed throughout much of the reservoir via interflows and underflows. The highly seasonal sediment yield of the watershed produces varved deposits in the reservoir which contain distinct monsoon and dry season layers. These allowed the calculation of annual rates of sedimentation in parts of the reservoir, as well as the development of a model of sediment distribution throughout Phewa Tal based on rates and patterns of accumulation.

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