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The present study was conducted to explore the influence of geomorphic features of the area on the mobilization of arsenic ingroundwater. In this study, remote sensing and GIS techniques were used to prepare the geomorphic and slope map of the area.Different geomorphic features were identified on the basis of spectral signature on the LISS III and Landsat satellite image and fieldsurvey. Groundwater samples were collected from each representative geomorphic feature to inspect the arsenic contamination in thearea. The study area is drained by the Brahmaputra river and its tributaries and contain mainly fluvial geomorphic units especiallyolder flood plain, palaeochannels, oxbow lakes, channel islands; and hilly areas at some of the places. In this study it was observedthat enrichment of arsenic in groundwater varies along the geomorphic units in following trends Paleochannel> Younger alluvialplain> Active flood plain> channel island > dissected hills. The above trend shows that a higher concentration of arsenic is found inthe groundwater samples collected from the fluvial landforms as compared to those collected from structural landforms. BrahmaputraRiver and its tributaries carry the sediment load from the Himalayan foothills, which get deposited in these features during the lateralshift of the river’s courses. Arsenic bearing minerals may get transported through river and deposit in the geomorphological featuresalong with organic matter. The flat terrain of the area as seen from the slope map provides more residence time to water to infiltrateinto the aquifer. The microbial degradation of organic matter generates the reducing environment and facilitates the dissolution ofiron hydroxide thus releasing the adsorbed arsenic into the groundwater

Utilisation of satellite data in identification of geomorphic landform and its role in arsenic release in groundwater