| dc.description.abstract | Coastal erosion, land use and land cover (LULC) changes analysis using remote sensing is a dynamic, relatively
low cost based precise method using now a day. Coastal districts of Bangladesh occupied by naturally grown
mangrove forest which are susceptible to rapid land cover (LC) changes and natural erosion. Barguna and
Patuakhali districts of Bangladesh deserve special attention for conserving coastal mangrove forest named
Tengragiri Wildlife Sanctuary and variety of human forces income. The core objective of this research is to
analyze the LULC change along with coastal erosion analysis from 2000 to 2017. Combination of four years
Landsat satellite image analysis, primary field data, geo-tag photography, secondary information, utilization of
forest carbon inventory 2015 data, and semi-structured questionnaire are the key approaches adopted in the
study. K-means cluster based unsupervised and maximum likelihood supervised classification by using ERDAS
Imagine 2014 found the total study area is 33,361 ha. Random sampling (40 points/class) based accuracy
assessment and verification by google earth pro 7.1 found overall accuracy 88.15% and Kappa coefficient is
0.867. Python coding program and overlay operation tested for conversion analysis any found weighted overlay
provide best results. An intensive RS analysis of 33,564 ha mangrove forest and community landscapes generated
six (6) distinct land cover class and sub-classes, e.g. Forest, agriculture & grassland, plantation, sandbar, settlement and waterbody. During 2000–2017, agriculture and grassland were decreasing 23 ha/year. Out of
11,831 ha (in 2000) Agri-grass land 9,326 ha remained intact while remaining 2,246 ha converted to settlement
mixed with homestead plantation class. This study also presents the landscape erosion-accretion due to natural,
quasi-natural and anthropogenic interventions which shows that, along the river flow and at the confluence at
the Nishanbaria Union (local name Khouttar Char & Fakir hat) to lower side of the Tengragiri WS locations are
susceptible to high trend of land erosion whereas accretions are prominent on the reverse sides named Baliatali
Union, Barabagi Union and so on. These results of the study and developed maps will be helpful for the community people, line departments, national and international policy maker and the researchers’ community for
monitoring coastal geomorphology including erosion and accretion of this landmass. | en_US |
