Bathymetric mapping and Sub bottom profiling of Punem Lake using Ground Penetrating Radar

Abstract

The present study deals with the bathymetric mapping and sub-bottom profiling of Punem Lake, a shallow perennial water body, located at the northern part of the Thoubal district, Manipur. To achieve the goal an extensive survey of the lake is done using Ground Penetrating Radar (GPR) consisting of 52 profiles with a total length of 8308m. Using RadExplorer the GPR profiles are processed to obtain the depth of the lake bottom which is later on used in generating the bathymetry of the lake using Discover surface module of the MapInfo. GPR provides high resolution images and the profiles are processed to successfully image discontinuities of the depth range upto 6 meters. Deep horizontal continuous line, hyperbolic curve and shallow chaotic reflection are the primary features imaged by GPR in the lake.