Abstract
Abstract. The concern of present-day conservation of eco-environment and its approach is to diminish the vulnerability, which demands focus region identification and protection. The identification of the focus region needs greater expertise and management. However, assessment of eco-environmental vulnerability requires numerous variables. The variables are categorised under four extensive aspects namely, hydro-meteorology, land resources, topography and socio-economic factors. The Pombar watershed enfolds three main urbanised cities Bargur, Thirupattur and Uthangarai connected by state-highway (SH-179A) and most of the settlements are situated near foothill regions. Thus, the cultural features persisting in the watershed are subjected to eco-environment vulnerable conditions. Therefore, extraction of variables is carried out using Landsat 8 OLI, Sentinel-2B, ALOS PALSAR DEM and IMD rainguage data respectively. The generated parameters affecting the environment are weighed and ranked through the Analytical Hierarchical Process (AHP) with Geospatial technology for eco-environment vulnerability assessment. Then vulnerability level is categorised into five classes like very high, high, moderate, low and very low with an area of 10%, 12%, 37%, 23%, and 18% respectively. The very high and high classes are distributed in low lying plain regions, where there is high anthropogenic activities, urbanisation and industrialisation, a moderate vulnerable class is more in plateau region due to deforestation and over exploitation. However, very low and low classes are sparsely distributed in higher altitude. The integration of Geospatial technology with AHP makes a powerful tool to assess the eco-environment vulnerability and therefore, three focus regions are demarcated to devote a massive concern on protection and management in the essence of sustainable development.
Highlights
Hazard and disaster are indispensable issues that act as a threat to humans and their surroundings
Since 1960, the environmental impact assessment came into use (Weston, 2004; Wang et al, 2008), ecological and environmental impact and vulnerability assessment evolved later to estimate the quantitative level of degradation and condition of ecoenvironment with the help of Remote Sensing (RS) and Geographic Information System (GIS) (Store and Jokimaki, 2003; Krivtsov, 2004; MacMillan et al, 2004; Wang et al, 2008)
Urge the need to assess the ecoenvironmental vulnerability in the study area
Summary
Hazard and disaster are indispensable issues that act as a threat to humans and their surroundings. Analytic Hierarchy Process (AHP) is one of the unique techniques in multiple criteria decision-making approaches This semi-arid region requires multi factor to conclude a result, for which pairwise comparison matrix is the best supporting step to assign rank and weightages for each factor so that the hierarchical structure will reflect in the vulnerable. The study preferred AHP as the finest method to adopt for eco-environmental vulnerability assessment In this present study, Remote sensing data production of Landsat 8 OLI, Sentinel 2B and ALOS PALSAR DEM were incorporated in GIS environment to extract a real-time result. The aim of the study is to evaluate the current eco-environment condition to acquire knowledge about the degree of vulnerability, in order to adopt a management plan for sustainable development in the study area
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