Abstract
The bowl-shaped depressions between the natural levees of rivers, mostly found in the wetland of the north-eastern part of Bangladesh are locally known as Haor. This study has tried to find out the dynamics of land use/land cover (LULC) change of Tanguar Haor, a Ramsar Site of Bangladesh between 1989 and 2017. Satellite data from Landsat archive have been used to determine the LULC change and collected primary data through a questionnaire survey used to identify the factors and impacts of LULC change. Post-classification change detection techniques have been applied to evaluate the LULC change, and descriptive statistics are applied for qualitative analysis of primary data as well as other secondary data
Highlights
Bangladesh, one of the most active deltas of the world, possesses enormous wetland areas, out of which the principal ones are the rivers and streams, freshwater lakes and marshes including haors, baors, beels, and jheels
A comprehensive study focusing both on spatiotemporal land use/land cover (LULC) change using GIS-RS and underlying socio-economic factors behind the change using field study hardly found in case of Tanguar Haor
Desalegn et al [19], mentioned that only physical land cover change study with GIS-RS cannot evaluate the dynamics, causes, and impacts alone, in-depth field study is a prerequisite for understanding the behaviour and response of LULC change
Summary
Bangladesh, one of the most active deltas of the world, possesses enormous wetland areas, out of which the principal ones are the rivers and streams, freshwater lakes and marshes including haors, baors, beels, and jheels. The Directory of Asian Wetlands identified the wetlands of the haor basin, including ten key sites of greater Sylhet and Mymensingh regions, as a wetland ecosystem of outstanding international importance [3] Six of these key sites - Tanguar Haor, Pashua Beel and Gurmar Haor, Hakaluki Haor, Hail Haor, Kawadighi Haor, Baulai Haor - have been identified by Bangladesh Flood Action Plan (FAP) as of outstanding national and international importance [4]. Among these sites, Tanguar Haor which is said to be part of the world’s largest geosyncline [5], is a unique haor system with bowl shape topography and uneven surface texture. The Haor fulfils at least three of the criteria established for declaring a wetland of internationally important, as adopted by the Montreux Conference of the Contracting Parties each of which alone is sufficient for proposing it as Environmental Analysis & Ecology Studies
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