Abstract
Abstract. Wular lake, located at an elevation of 1520 m above sea level in Kashmir valley, India. In the present study, the immediate and long term impact of flood (2014) over the Wular lake environs was analyzed by using satellite images and employing supervised classification technique in GIS environment. The LULC classification was performed on the images of 25th August 2014 (pre flood) and 13th September 2015 (post flood) and was compared, which indicated marked decrease in terrestrial vegetation (23.7 %), agriculture (43.7 %) and water bodies (39.9 %). Overlaying analysis was performed with pre and post flood classified images with reference to the satellite image of 10th September 2014(during flood) which indicated total area inundated during flood was 88.77 km2. With the pre-flood situation, the aquatic vegetation of 34.06 km2, 13.89 km2 of agriculture land and terrestrial vegetation of 3.13 km2 was inundated. In the post flood situation, it was also came into focus that more than the half of the area under water bodies was converted into sand deposits (22.76 km2) due to anomalous increase in siltation. The overlay analysis on post flood classified image indicated that aquatic vegetation followed by agriculture and sand deposits lie within the flood inundated area. Further spatial analysis was performed within the flood inundated area (88.77 km2) with pre and post classified image to understand the situation before and after the flood and to calculate the changes. These land use-land cover transformations signifies the ill effect of flooding on the biodiversity of Wular Lake.
Highlights
Lakes are formed in the rock basins having different shapes and sizes
The land use/ land cover classification of Wular lake and its environs during pre-flood (August 2014) and post flood (September 2014) situation was analyzed in order to deduce the immediate and long term impacts of flood inundation condition over varied land uses/ cover
The 22.76 km2 area of sand deposits was observed during post flood period, which leads to decrease in area of aquatic vegetation, agriculture and water bodies
Summary
Lakes are formed in the rock basins having different shapes and sizes It classified into glacial, Alpine and valley depending upon their origin, height and nature of biota and provide to opportunity to study the structure and functional process of an aquatic ecosystem system (Kaul 1977;; Trisal 1985; Zutshi et al 1972). Flood hazard mapping vulnerability assessment plays an important component for land use planning in areas affected by flood. Wular lake is losing its water holding capacity in order to deal with the problem of flood (Mushtaq et al, 2015). In the present study, the land use/ land cover was mapped and correlated with the ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume IV-4/W4, 2017 4th International GeoAdvances Workshop, 14–15 October 2017, Safranbolu, Karabuk, Turkey flood inundation situated to analyze the immediate and long term flood impact over the varied LULC
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