River bank accretion/erosion is the most important geomorphological processes in natural
process attracting a great deal of attention from river engineering scientist. In this study, river
bank accretion/erosion assessment in the confluence of Thao-Da-Lo rivers in the period of
1986-2017 is presented based on the combination of histogram thresholding and band ratio
techniques. Landsat 5 TM and 8 OLI imageries were first used of river bank extraction, GIS was
then employed to assess river bank changes and accretion/erosion. It was found that, Thao-Da-Lo
river banks have changed complexly, especially on the left bank. Accretion and erosion occurred
frequently on both sides of the river, mainly occurred in the left bank of the confluence area
such as Tan Duc (Ba Vi district), Minh Nong and Ben Got (Viet Tri city). Almost no erosions
were found in the right bank (Phong Van, Co Do, Phu Cuong, Tan Hong, Chau Son and Phu
Phuong) in this period. The study showed the effective use of remote sensing and GIS in river
bank accretion/erosion assessment.
Keywords
River bank; Accretion/erosion assessment; Thao-Da-Lo river; Landsat imageries
ENIVRONMENT ASIA
Published by : Thai Society of Higher Education Institutes on Environment Contributions welcome at : http://www.tshe.org/en/
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