Depositional river terraces in tectonically active regions are used to determine the relative roles of tectonic and climatic changes in the landscape evolution of an area.Apart from providing evidences of tectonic and...Depositional river terraces in tectonically active regions are used to determine the relative roles of tectonic and climatic changes in the landscape evolution of an area.Apart from providing evidences of tectonic and climatic shifts,these terraces over a long period act as a source of sediment,which is eroded from them.A terrace located in the Lesser Himalaya of known age and a small drainage network developed over it(indicating it to be the only source of erosion),was studied to estimate the rate of erosion.The rate of erosion was calculated by comparing the pre-erosion topography of the terrace modelled in this study by the present day topography of the terrace.Results show that these stored sediments in the form of a depositional terrace are being eroded at a rate of 190 tonnes/year.The results suggest that the rate at which these sediments are eroded is considerable and contributes significantly to the total sediment budget of the river.展开更多
基金Delhi University for providing research grant(no.R&D/2010/1489)for carrying out this study.
文摘Depositional river terraces in tectonically active regions are used to determine the relative roles of tectonic and climatic changes in the landscape evolution of an area.Apart from providing evidences of tectonic and climatic shifts,these terraces over a long period act as a source of sediment,which is eroded from them.A terrace located in the Lesser Himalaya of known age and a small drainage network developed over it(indicating it to be the only source of erosion),was studied to estimate the rate of erosion.The rate of erosion was calculated by comparing the pre-erosion topography of the terrace modelled in this study by the present day topography of the terrace.Results show that these stored sediments in the form of a depositional terrace are being eroded at a rate of 190 tonnes/year.The results suggest that the rate at which these sediments are eroded is considerable and contributes significantly to the total sediment budget of the river.
