Mapping and Change Detection of Water Bodies in the Godavari Delta using Geospatial Technology

Manikandan P, Yellamelli Ramji Satyaji Rao

Abstract


Geospatial technology has been used to map the water bodies of the Godavari Delta in 2005, 2009, 2014, and 2019. The Normalized Water Difference Index (NDWI) and the Modified Normalized Water Difference Index (MNDWI) have been used to map water bodies in the summer months (April / May). The Godavari Delta has been divided into two regions. One is the upland, and the other is the coastal region. Comparing NDWI and MNDWI with the APSAC assessment of water bodies in 2019 (May) indicated that the MNDWI is close to the APSAC assessment in the Godavari delta. The MNDWI displayed that from the year 2005 to 2019, water bodies have been increased from 0.96% to 3.2% in the upland region and from 11.42% to 20.91% in the coastal region. The improved water bodies are compared with the local precipitation within the delta, and found that there has been no impact of rainfall on the increase of water bodies in the delta. This boom in the water bodies changes due to the construction of artificial drinking water ponds and conversion of paddy fields into aquaculture in the upland and coastal areas regions. Further investigations are required to identify freshwater and saline water bodies in the Godavari Delta.

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