SPATIO-TEMPORAL ANALYSIS OF LAND USE AND LAND COVER CHANGES IN BARGUNA DISTRICT OF BANGLADESH USING REMOTE SENSING TECHNIQUES: FOCUSING ON MANGROVE VEGETATION

Land use and land cover (LULC) change detection using remote sensing techniques is an important and least time-consuming process particularly for combating natural disasters. This study focused on the mapping and analysis of the LULC changes in the Barguna District, Bangladesh for the years 1990, 2000, 2010 and 2017. In this study, data were collected from Landsat 5 TM & 8 OLI_TIRS during the years. Mainly Normalized Difference Vegetation Index (NDVI) was performed for mapping of the different classes (water, residence, agricultural field and mangroves) for each of the mentioned years. It has found that water (­0.86%), agricultural field (­3.63%), mangroves (­9.97%) were increased and residence (↓14.46%)) was decreased from the year 1990 to 2000. However, within the next ten years from 2000 to 2010, it has found that water (­1.05%), residence (­11.48%) were increased and agricultural field (↓7.47%), mangroves (↓5.07%) were decreased that could be the two severe natural disasters in 2007 (the extreme super cyclone Sidr) and 2009 (the cyclone Aila). After that, water (­0.90%), mangroves (­15.45%) were increased and residence (↓7.10%), agricultural field (↓9.24%) were decreased from the year 2010 to 2017. Finally, the overall scenario was observed that water (­2.82%), mangroves (­20.35%) were increased and residence (↓10.08%), agriculture field (↓13.09%) were decreased from the year 1990 to 2017. It has observed that from the year 1990 to 2017, mangroves vegetation were increased from 9.32% to 19.02% which means the government had taken the initiatives to mangroves plantation that indicated around 348.26 km2 afforestation has occurred. These results of the study and developed maps will be favorable for the communal people, relevant departments, national and international planers and the researchers of the community.