Tectonic controls on the geomorphic evolution of alluvial fans in the Piedmont Zone of Ganga Plain,Uttarakhand, India |
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Authors: | Pradeep K Goswami Charu C Pant Shefali Pandey |
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Institution: | 1.Department of Geology,Kumaun University,Nainital,India |
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Abstract: | The Piedmont Zone is the least studied part of the Ganga Plain. The northern limit of the Piedmont Zone is defined by the
Himalayan Frontal Thrust (HFT) along which the Himalaya is being thrust over the alluvium of the Ganga Plain. Interpretation
of satellite imagery, Digital Terrain Models (DTMs) and field data has helped in the identification and mapping of various
morphotectonic features in the densely forested and cultivated Piedmont Zone in the Kumaun region of the Uttarakhand state
of India. The Piedmont Zone has formed as a result of coalescing alluvial fans, alluvial aprons and talus deposits. The fans
have differential morphologies and aggradation processes within a common climatic zone and similar litho-tectonic setting
of the catchment area. Morphotectonic analysis reveals that the fan morphologies and aggradation processes in the area are
mainly controlled by the ongoing tectonic activities. Such activities along the HFT and transverse faults have controlled
the accommodation space by causing differential subsidence of the basin, and aggradation processes by causing channel migration,
channel incision and shifting of depocentres. The active tectonic movements have further modified the landscape of the area
in the form of tilted alluvial fan, gravel ridges, terraces and uplifted gravels. |
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