Change Detection Using Landsat Data 2000 and Sentinel Data 2020 for Meghadrigedda Sub-Watersheds Using Hydrogeomorphology, NDWI and, NDVI, Visakhapatnam District, Andhra Pradesh-India | Chapter 7 | Current Advances in Geography, Environment and Earth Sciences Vol. 4

 With global warming and over-exploitation of water resources as a result of population growth and other challenges, several studies are being conducted around the world to restore a balance of current water resources and consumption. This research is based on a 366-square-kilometer watershed surrounding the Meghadrigedda reservoir in the Visakhapatnam district of Andhra Pradesh, India, on a 1:50,000 scale 65O/1 SOI map. The watershed was divided into nine sub-watersheds, and the study area's hydrogeomorphology, drainage, drainage density, slope, NDVI, and NDWI were all completed using Landsat data 2010 and Sentinel data 2020 in ArcGIS 10.0. All of the villages in the catchment rely heavily on groundwater for irrigation, drinking, and personal use. The decline in surface water and groundwater as a result of increasing built-up area, pond siltation, and a reduction in the number of ponds was shown using change detection. In the watershed, large-scale anthropogenic activities are taking place. The government must reduce built-up activity and desilt the ponds to keep the monsoon water flowing. The study's findings can be used to plan and build a long-term basin area.

Author(s) Details:

Usha Chirala,
Department of Geo-Engineering, Andhra University, Vishakhapatnam, India.

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An Illustrated Study on Mapping of Soil Erosion Zones of Meghadrigedda Catchment, Visakhapatnam, India for Conservation– A Geospatial Approach | Chapter 9 | International Research in Environment, Geography and Earth Science Vol.3

 Meghadrigedda, a non-perennial drainage system is one of the major water resources of

Vishakhapatnam city located in the northern coastal region of Andhra Pradesh, India. It traverses
through the hilly terrain of Eastern GhatMobile Belt (EGMB) characterized by khondalitic rock
formations. Excessive siltation scenario aggravated due to soil erosion in its catchment is threatening
the very existence of Meghadrigedda reservoir. In order to assess the intensity of soil erosion as well
as silt deposition in the reservoir, an integrated study has been undertaken which takes into
consideration various topographic, morphological, soil, and land use/land cover characteristics of the
basin. The study aims at identification and mapping of erosion prone zones with respect to silt
deposition using remote sensing and GIS techniques. Alteration in human induced land use practices
in its catchment due to rapid growth in population; urbanization and industrialization are found to be of
prime reasons for various forms of erosion. The study has noticed that various forms of erosion like
sheet, gully and stream erosion are responsible for the siltation at large scale which is causing
reduction of its designed storage capacity by 40%. Various sub-water-sheds of the basin have been
prioritized on the basis of erosion intensity for suggesting various mitigation measures like check-dam
construction, afforestation etc. to protect the reservoir from the silting problem.

Author(s) Details

Dr. Usha Chirala
Department of Geo-Engineering, College of Engineering (A), Andhra University, Visakhapatnam, India

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