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Pandey, Anand K.
- Climate Footprints in the Late Quaternary-Holocene Landforms of Dun Valley, NW Himalaya, India
Abstract Views :257 |
PDF Views:99
Authors
Affiliations
1 CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad 500 007, IN
2 Geological Survey of India, Gandhinagar 382 010, IN
3 Geosciences Division, Physical Research Laboratory, Navrangpura, Ahmedabad 380 009, IN
1 CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad 500 007, IN
2 Geological Survey of India, Gandhinagar 382 010, IN
3 Geosciences Division, Physical Research Laboratory, Navrangpura, Ahmedabad 380 009, IN
Source
Current Science, Vol 106, No 2 (2014), Pagination: 245-253Abstract
The Himalayan mountain front is characterized by front parallel longitudinal valleys called Dun, that occupy the synformal troughs. The perennial glacialfed rivers Ganga and Yamuna experience first major gradient loss along the valley floor of Dehra Dun and produce characteristic landforms and deposits by the gradational processes of streams that are often controlled by climate fluctuation. In Dun valley, barring an isolated patch of ∼26 and 20-ka-old terrace, no strath terrace older than the Holocene is observed along the Ganga and Yamuna rivers. A large stretch of the Dun valley is being filled by piedmont deposits that started aggradation since >40 ka until the beginning of the Holocene and have since been undergoing incision. A similar trend is observed in upper Ganga valley, where multiple Late Quaternary aggradational terraces are observed. We analyse these landforms and associated deposits in the Dun valley to unde rstand the role of Late Quaternary-Holocene climate fluctuations and their effect on associated gradational processes.Keywords
Climate Change, Geomorphic Landforms and Deposits, Gradational Processes.Full Text
- Centre for Himalayan Study in Uttarakhand
Abstract Views :254 |
PDF Views:83
Authors
Affiliations
1 CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad 500 007, IN
1 CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad 500 007, IN
Source
Current Science, Vol 107, No 10 (2014), Pagination: 1647-1648Abstract
No Abstract.Full Text
- Soft Sediment Deformation Structures in Late Quaternary Abandoned Channel Fill Deposit of Yamuna River in NW Sub-Himalaya, India
Abstract Views :197 |
PDF Views:166
Authors
Affiliations
1 CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad 500 007, IN
1 CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad 500 007, IN
Source
Current Science, Vol 108, No 9 (2015), Pagination: 1717-1725Abstract
Soft sediment deformation (SSD) structures are observed in a 26-25 ka old fluvio-lacustrine channel-fill deposit in tectonically active Dun valley in NW Sub- Himalaya. This fluvio-lacustrine channel-fill deposit experienced intermittent inundation during initial phase of erosional avulsion with the growth of a plug bar causing complete channel abandonment. The facies depict variation from an active channel to rhythmite and lacustrine deposition in an abandoned channel setting. In the studied section, three zones of SSD structures comprising load structures, contorted beds, slumps, folds and faults are observed. These zones are invariably overlain by undeformed beds suggesting recurrent deformation. The varying geometry of SSD structures suggest gravity-driven viscous-brittle deformation in the sediment column possibly due to differential liquidization in the beds with varying grain size, when the equilibrium was disturbed by a trigger mechanism. Since the region lies in the seismically active Himalayan belt, earthquakeinduced strong ground motion may be the most plausible trigger mechanism for the observed SSD in the abandoned channel deposits and slope, sediment overloading or groundwater change may not have played a major role.Keywords
Abandoned Channel, Rhythmite, Soft Sediment Deformation, Sub-himalaya, Trigger Mechanism.Full Text
- Mapping Shallow Subsurface to Identify Sinkhole Formation in Urban Areas using Ground Penetration Radar:A Case Study from Hyderabad, India
Abstract Views :261 |
PDF Views:84
Authors
Affiliations
1 Academy of Scientific Innovation and Research, CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad 500 007, IN
1 Academy of Scientific Innovation and Research, CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad 500 007, IN
Source
Current Science, Vol 117, No 10 (2019), Pagination: 1710-1715Abstract
Ground penetrating radar (GPR) survey can be used to image geological hazards such as cavities, faults, fissures and also for identifying buried utilities. Sinkholes formed in the Secunderabad-Patny stretch road, Hyderabad, India were speculated to have been caused due to leaking from the sewer pipe. GPR survey using 200 MHz antenna was used in order to study the sinkholes formed in the collapsed area. GPR profiles were taken both parallel to and perpendicular to the road section to get a complete 3D visualization. Subsurface images acquired the marked position of the manholes, cavities, loose soil, different utilities, and sewer pipeline in the area. The results showed that there was no leaking in the sewer pipeline, instead, a water pipeline was damaged due to poor maintenance. Thus, GPR can be efficiently used to delineate the subsurface infrastructure and has further played an important role in identifying, delineating the zone of sinkhole in a busy street in Secunderabad.Keywords
Civic Utilities, Ground Penetrating Radar, Shallow Subsurface, Sinkhole.Full Text
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