Land use change mapping and its impact on storm water runoff using Remote sensing and GIS: a case study of Mumbai, India

Abstract

The rapid increase in urbanization worldwide has induced a change in land use–land cover (LULC) over the years. In Mumbai, India, this has further altered the hydrological processes like infiltration, evapotranspiration, interception and erosion and also caused loss of current drainage capacity and flooding in urban areas. This paper mainly assesses the changes in land-use land-cover types and its impact on storm water discharge from 1973 to 2018 in Mumbai using ArcGIS software. The image was classified into five LULC categories after superimposing in Arch-GIS, such as forest, open land, wetland, water and built-up area. The analysis of LULC pattern for the area under study over a period of 45 years showed that there was 66% rise in the built-up area whereas the Forest, open land and Wetland and water body together had reduced by 21%, 36% and 28%, respectively with respect to overall catchment area of Mumbai. Also, the analysis results gave a rise in peak discharge of storm water by 36% because of the changes in LULC over the given time period. On the whole, the land area affected by water logging has significantly increased over the time. The study therefore indicates that the integration of GIS and remote sensing was an effective way of approach for assessing the process of land-use land-cover change.