Remote sensing revealed drainage anomalies and related tectonics of South India

Ramasamy, S. M.; Kumanan, C. J.; Selvakumar, R.; Saravanavel, J.

doi:10.1016/j.tecto.2011.01.011

Cited by 41 publications

(16 citation statements)

References 18 publications

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“…Also, rivers are very sensitive to topographic changes caused by uplift or subsidence and are thus ideal markers to identify recent tectonic activity [3]. These drainage anomalies may have structural or lithological origins and can also be induced by erosion [15]- [18] [33] [34].…”

Section: Methodsmentioning

confidence: 99%

Evaluation of Neotectonic Signature Using Morphometric Indicators: Case Study in Nefza, North-West of Tunisia

Sedrette¹,

Rebai²,

Mastere³

2016

JGIS

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Neotectonic activity can be deduced from stream network patterns and as an outcome of its evolution. The objective of this study is to investigate the use of the stream network morphology and morphometric methods to assess neotectonic signatures in Nefza region situated in NorthWest of Tunisia. For this aim, a Digital Elevation Model (DEM), hydrographic layers extracted from Nefza topographic map (1/25,000), lithology and tectonic lineament parameters extracted from the geologic map (1/50,000) were used. The objective of this paper is to map structural and lithological discontinuities of the study area, by the morphostructural analysis of the topography extracted of DEM as well as the drainage anomalies. This work allowed the characterization of discontinuities of lithologic and structural origin. The previously conducted studies in the study area, confirm that is crossed by lineaments at several directions E-W, N-S, NE-SW and NW-SE. Based on the results obtained from this study regarding the correlation between tectonic and hydrographic network, we can highlight a regional rejuvenation tendency of the most mapped lineaments.

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Section: Methodsmentioning

confidence: 99%

Evaluation of Neotectonic Signature Using Morphometric Indicators: Case Study in Nefza, North-West of Tunisia

Sedrette¹,

Rebai²,

Mastere³

2016

JGIS

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“…However, within this larger ensemble, certain portions of the lands show younger topographic surfaces and recent-historical seismicity and these in turn were evidenced by the investigations on the longitudinal profiles, morphotectonic indices of active tectonics and fluvial records (for example, Ramasamy et al 2011;Kale et al 2013). Except such generalizations on a regional scale, microscale studies on any of the river basins of south India are scarce.…”

Section: Introductionmentioning

confidence: 94%

“…Geomorphology represents either qualitative or quantitative nature of landforms, landscapes and surface processes including their description, classification, origin, development and history highlighting the physical, biological, and chemical aspects (Baker 1986;Anbazhagan and Saranathan 1991;Easterbrook 1999;Keller and Pinter 2002;Morisawa 1958;Ramasamy et al 2011). Tectonism in general has a geomorphic expression in the region where it occurs and its adjacent areas (Gerson et al 1984).…”

Section: Introductionmentioning

confidence: 99%

GIS Based Quantitative Geomorphic Analysis of Fluvial System and Implications on the Effectiveness of River Basin Environmental Management

Arul

Jothibasu

Anbazhagan

2015

Environmental Management of River Basin Ecosystems

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Rivers are sensitive to changes in tectonic deformation, and adjust themselves on different scales of time periods depending on the physical properties of the host rocks and climatic effects. The resultant changes are exhibited by the geomorphic indices and landform assemblages within a river basin. This paper presents the results of integrated quantitative geomorphic analysis conducted for understanding the prevalent tectonic activities in a medium sized drainage basin, the Thoppaiyar sub-basin, India. The major part of the study area is covered by gneisses and granites. The sub-basin is divided into fourteen fourth order micro basins (FOMBs) for quantitative geomorphic analysis. Prior to quantitative analysis, longitudinal river profile and channel morphology were studied. The channel morphology includes cross sections, width-to-depth ratio, entrenchment ratio, bank height ratio were measured during field investigation. Various geomorphic indices namely, the basin shape index (Bs), drainage basin asymmetry factor (Af), hypsometric integral (Hi), hypsometric curve (Hc), valley floor width-to-height ratio (Vf), transverse topographic symmetry (T) and stream length gradient index (SL) were derived using topographic maps and SRTM satellite data. The spatial distributions of these parameters were represented as thematic layers using. The results obtained from these indices were combined by ArcGIS 9.3 software to generate an index of relative active tectonics (I RAT ) in the sub-basin. It indicated the prevalence of differences among the FOMBs and an overall relatively low tectonic activity in the Thoppaiyar sub-basin.

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“…The drainage network that was extracted from the DEM shows a dendritic pattern following slope and topography (Figure 2). This given drainage system was examined in terms of drainage anomalies, which describe any kind of local deviation from the original dendritic drainage pattern (Huggett 2007;Ramasamy et al 2011). These deviations are defined as deflected channels or compressed meanders (Figure 2) and their analyses is a common method in geomorphological studies as the drainage system is likely controlled by neo-tectonic deformation (Bhosle et al 2009;Estrada 2015;Ramasamy et al 2011).…”

Section: Drainage System Analysesmentioning

confidence: 99%

Geoarchaeological Evidence for the Decline of the Medieval City of Qalhat, Oman

Ermertz¹,

Kázmér²,

Adolphs³

et al. 2019

Open Quaternary

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The medieval city of Qalhat was an important trade town along the sea routes in the Indian Ocean. The reasons for the decline of the city are unclear, as the archaeological evidence is inconclusive. Geological field work was conducted and a digital elevation model analysed to test the hypothesis that the city was destroyed by an earthquake. The study area is located along the passive continental margin of the Arabian Plate. The coast shows a set of Pleistocene marine terraces. These landforms are in indication of lithosphere uplift. Faulted terrace fill deposits and deviating fluvial streams indicate rather recent lithosphere deformation. Processes responsible for the deformation are seen as subduction related forebulge uplift, serpentinite diapirism as well as isostatic response to karstification of limestone. We conclude that earthquake activity along the most prominent structural element, the Qalhat Fault, is a plausible reason for the decline of the medieval city.

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Remote sensing revealed drainage anomalies and related tectonics of South India

Cited by 41 publications

References 18 publications

Evaluation of Neotectonic Signature Using Morphometric Indicators: Case Study in Nefza, North-West of Tunisia

Evaluation of Neotectonic Signature Using Morphometric Indicators: Case Study in Nefza, North-West of Tunisia

GIS Based Quantitative Geomorphic Analysis of Fluvial System and Implications on the Effectiveness of River Basin Environmental Management

Geoarchaeological Evidence for the Decline of the Medieval City of Qalhat, Oman

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