Tracing the Source of Water Leakage in Towhid Street (Center of Tehran) Using Ground Penetrating Radar Method

Abstract

After observing two water seepages in Towhid Street in the 2 districts of the municipality of Tehran, the GPR Department had decided to use ground penetrating radar method to detect possible scouring area on the site. In this study, GPR method has been used to identify the source of water seepages in different parts of in Towhid Street. The GPR data acquisition had been performed by the Mala-HDR 80 MHz GPR Shielded antenna. The data collected in 14 longitudinal profiles. At the next step, the collected data have been processed by the GPR experts of the Geophysics Department at Geotechnical & Strength of material study center of Tehran. In the processing of the GPR data, different filters such as background removal, migration, band pass filter, and horizontal and vertical smoothing are applied to the data. The results obtain from this research work indicate that the GPR method, in addition to its speed and simplicity in data acquisition, is very successful in detection of leaking areas in which electromagnetic properties change rapidly.. It seems two parts of water pipe which is passed under in Towhid Street and along to the tunnel path have been damaged.