Abstract
ABSTRACT Surface water change is a very important indicator for environmental, climatic, and anthropogenic activities. The sediment brought by the stream into the reservoir starts settling down and gets deposited on the bed of the reservoir at all levels. The finer particles are carried in suspension and settle down on the reservoir floor while some of these are passed over the spillway towards the downstream of a dam. If the concentration is high, density current occurs along the floor of the reservoir. The purpose of this study is to assess the sedimentation of the Poondi Reservoir using Satellite Remote-Sensing (SRS). This helps in providing full utilization capacity of reservoir by providing more storage and supply of fresh water to the catchment area. The sedimentation assessment was carried out using satellite data and reservoir water level data from 2000 to 2020. Water spread area was analyzed from satellite data. The NDWI has been used to delineate open water features and to enhance the presence of water surface and linear interpolation/extrapolation technique has been applied for water spread area at different elevation. Further, these areas were used to compute live storage capacity of reservoir between two elevations by Prismoidal formula.
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