Georadar (Water Bodies)

Ground Penetrating Radar (GPR) is a versatile technique, which yields stratigraphic profiles and locates buried objects. The underlying principle of GPR is based on the propagation of electromagnetic wave impulses of very high frequency (40 to 1000 MHz) that are reflected by anomalies in the sub-surface (joints, irregularities, interfaces etc.) at different depths and then recorded by the antenna. The system records the amplitude of the reflected signal and the two-way time it takes to complete the cycle in order to calculate the depth of the anomaly.

Georadar is considered to be the most effective method, on land and for water bodies (rivers & lakes only), to obtain information of buried objects, buried pipelines, rails etc. The method has a great advantage of being very fast, enabling the Geo-physicist to actually see the sub-surface conditions while doing the data acquisition. The data is later on processed for establishing the depth, diameter and other properties of detected pipes.

Georadar can detect both metallic and non-metallic objects, and even objects very close to each other.

Georadar is also effectively used for bathymetry in case bottom has vegetation making it unsuitable for an ordinary depth sounder, identification of various sediment layers (depth & thickness), presence of boulders, rocks or other objects lying on the floor or buried. The technique also detects geologic contacts and other features having a dielectric contrast with surroundings.