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Internal sedimentary architecture and coastal dynamics as revealed by ground penetrating radar, Kachchh coast, western India

Shukla S., Chowksey V., Prizomwala S., Ukey V., Bhatt N., Maurya D.

Acta Geophysica

2013

Vol. 61, no. 5

1196--1210

The coastline constitutes a very sensitive geomorphic domain which is constantly subjected to dynamic coastal processes and stores vital information regarding past sea level fluctuations. A ground-penetrating radar (GPR) survey was carried out along the northern coast of the Gulf of Kachchh which is one of the largest macrotidal inlets of the Arabian Sea, Western India. Our studies have delineated several radar surfaces and radar facies which reflect the internal architecture and sediment body geometry, which can be related to the processes acting along this coastline. Various radar facies, namely, beach ridge (Br), washover (Wo), coastal dune (Cd), swale (Sw), berm plain (Bp), and sandsheet facies (Ss) have been identified. The GPR studies successfully documented the subsurface presence of ancient beach ridge system towards the sea, and the coastal dunes towards the land side. The results are suggestive of signatures of changes in sea level and the coastline being prone to high energy events in the recent past. The GPR has been found to be an important non-invasive geophysical tool in the study of past coastal dynamics.

The effect of paramagnetic doping on the dielectric response of K1.85Na0.15Ti4O9 layered ceramics

Vikram S. V., Maurya D., Chandel V. S.

Materials Science Poland

2009

Vol. 27, No. 1

191--199

Ceramic samples of layered polycrystalline (K1.85Na0.15)Ti4O9:xCu (0 ? x ? 0.8) have been prepared using high temperature solid state reaction. Room temperature X-ray diffratograms confirm the phase evolution. Room temperature electron paramagnetic resonance (EPR) data show that Cu2+occupies Ti4+ lattice sites giving rise to electric dipoles which increases electric permittivity. The absorption peak in EPR spectra gets broadened due to increased exchange interaction in heavily doped derivatives. Dielectric data reveal that occupancy of Cu2+ on Ti4+ leads to a decrease in dielectric losses and an increase in the electric permittivity as well.