TITLE:
Quantification of River Bank Erosion and Bar Deposition in Chowhali Upazila, Sirajganj District of Bangladesh: A Remote Sensing Study
AUTHORS:
Md. Shareful Hassan, Syed Mahmud-ul-islam
KEYWORDS:
GIS, Remote Sensing, Landsat, River Erosion, Change Detection, Chowhali Bangladesh
JOURNAL NAME:
Journal of Geoscience and Environment Protection,
Vol.4 No.1,
January
12,
2016
ABSTRACT: River
bank erosion is one of the frequent but the most unpredictable disasters that occur
every year in Bangladesh. In this paper, Landsat TM-5 and Landsat-8 imageries
from 1989 and 2015 were used to detect changes of present land use, river
erosion and bar deposition in Chowhali Upazila, Sirajganj district of
Bangladesh. This study reveals that human settlement, forest, seasonal crops
and agriculture features decrease, while river coverage increases dramatically.
About 1340 hectare areas have been eroded, while 630 hectares are deposited as
channel bar in the study area over the last 26 years. Finally, an accuracy
assessment is conducted between the test data and each land use feature. The
overall classification accuracy was 97% and 98% in 1989 and 2015 respectively.
Moreover, 98% accuracy is found in erosion while 97% is found in bar deposition
areas.