Role of inherent geological and climatic characteristics on landscape variability in the tectonically passive Western Ghat, India

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dc.contributor.author Guha, Shantamoy
dc.contributor.author Jain, Vikrant
dc.date.accessioned 2019-12-03T14:21:43Z
dc.date.available 2019-12-03T14:21:43Z
dc.date.issued 2020-02
dc.identifier.citation Guha, Shantamoy and Jain, Vikrant, "Role of inherent geological and climatic characteristics on landscape variability in the tectonically passive Western Ghat, India", Geomorphology, DOI: 10.1016/j.geomorph.2019.106840, vol. 350, Feb. 2020. en_US
dc.identifier.issn 0169-555X
dc.identifier.issn 1872-695X
dc.identifier.uri https://doi.org/10.1016/j.geomorph.2019.106840
dc.identifier.uri https://repository.iitgn.ac.in/handle/123456789/4982
dc.description.abstract How does lithological variation affect the landscape and its evolution is a fundamental issue in modern and post-orogenic terrains. In the absence of active tectonic uplift, spatial variation of rock resistance and rainfall distribution are thought to primarily control the fluvial and hillslope processes. However, these lithologic and climatic controls are difficult to decouple owing to the fact that these post-orogenic terrains endure long and complex geomorphic history. To examine the relative importance of lithology and rainfall in a post-orogenic setting, we analyzed west-flowing drainage basins in the Western Ghat (WG) with a multi-proxy analysis. We relied on digital topography, sediment yield and hydrological data. We evaluated topographic relief, hypsometry, river-long profiles and sediment yield to elaborate the importance of spatial variability of rock resistance in the long term evolution of these drainage basins. The dominant increase of relief (?200�1500 m) and decrease of sediment yield (3.32�1.91 ton/month/km2) from north to south of the escarpment is directly attributed to the rock erodibility and structural characteristics. Field verification suggests that despite high rainfall condition, the channels are mostly detachment limited and therefore lack the abrasive tools. We further showed that the harder lithologies sustain higher steepness. On the contrary, the spatial distribution of satellite-derived rainfall showed a negligible effect on the long profile evolution. Our analysis is also supported by the existing knowledge of chemical denudation rate and implicates that rock hardness and weatheribility defines the topographic characteristics with little or no effect of rainfall in this passive margin setting.
dc.description.statementofresponsibility by Shantamoy Guha and Vikrant Jain
dc.format.extent vol. 350
dc.language.iso en_US en_US
dc.publisher Elsevier en_US
dc.subject Landscape-scale geomorphic en_US
dc.subject variability en_US
dc.subject Geological controls en_US
dc.subject Tectonically passive margin en_US
dc.subject The Western Ghat, India en_US
dc.title Role of inherent geological and climatic characteristics on landscape variability in the tectonically passive Western Ghat, India en_US
dc.type Article en_US
dc.relation.journal Geomorphology


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