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Lahiri, Siddhartha Kumar
- Application of Fast Fourier Transform in Fluvial Dynamics in the Upper Brahmaputra Valley, Assam
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PDF Views:87
Authors
Affiliations
1 Department of Applied Geology, Dibrugarh University, Dibrugarh 786 004, IN
2 Department of Earth Sciences, Indian Institute of Technology, Kanpur 208 016, IN
1 Department of Applied Geology, Dibrugarh University, Dibrugarh 786 004, IN
2 Department of Earth Sciences, Indian Institute of Technology, Kanpur 208 016, IN
Source
Current Science, Vol 108, No 1 (2015), Pagination: 90-95Abstract
Large tropical rivers such as the Brahmaputra flowing through tectonically active areas show highly variable bankline migration for the channel belt as a whole, as well as intra-bank, over different time windows due to different but non-uniform forcings. Fast Fourier transform (FFT) can be applied to identify frequency (cycles per unit length) content of bankline migration, to classify the wavelengths of different forcings and subsequently to compare the relative influence of different forcings for the trend analysis of bankline shift and width variation. This helps expand the interpretative scope of dynamics of river systems and plan mitigation strategies.Keywords
Bankline Migration, Fast Fourier Transform, Fluvial Dynamics, Forcings.Full Text
- Gas Leakage from Palaeogene Reservoir in Assam - A Geophysical Puzzle
Abstract Views :177 |
PDF Views:70
Authors
Affiliations
1 Department of Applied Geology, Dibrugarh University, Dibrugarh 786 004, IN
1 Department of Applied Geology, Dibrugarh University, Dibrugarh 786 004, IN
Source
Current Science, Vol 111, No 7 (2016), Pagination: 1242-1246Abstract
Reports of gas leakage started coming since the beginning of 2012 from different localities in the Deohal area near the oil township Duliajan, Assam (India). The source was located in a gas reservoir in the Palaeogene sediments (Barail group). Multi-component seismic reflection methods which were highly successful to locate gas bearing zones at depths, were not very effective to locate the same in the shallow subsurface. From different types of electrical surveys conducted, self-potential (SP) method showed the most promising result. Probable SP was sensitive to high electrokinetic potential difference between the leaking and non-leaking zones.Keywords
Deohal, Electrokinetic Potential, Gas Leakage, Palaeogene.Full Text
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