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Anbazhagan, S.
- River Profile Modeling and Fluvial Geomorphological Evaluation of Thoppaiyar Sub-Basin Using Geoinformatics Technology
Abstract Views :194 |
PDF Views:135
Authors
Affiliations
1 Centre for Geoinformatics and Planetary Studies, Periyar University, Salem-636011, Tamil Nadu, IN
1 Centre for Geoinformatics and Planetary Studies, Periyar University, Salem-636011, Tamil Nadu, IN
Source
International Journal of Earth Sciences and Engineering, Vol 10, No 3 (2017), Pagination: 484-494Abstract
The curvature of river profiles has long been taken to be a fundamental indicator of the underlying processes governing fluvial erosion and thereby of landscape evolution. Longitudinal profile is a graph of distance verses elevation is an x-y plot showing bed elevation as a function of downstream distance. Due to the plate movement is considerably slow, the human history record is too short to register landscape change for such a long time scale. In the present study, an attempt has been made the quantitative analysis of geomorphic indices coupled with some mathematical models for the Thoppaiyar sub-basin and its 16 micro-basins, including the gradient index (SL), normalized gradient index (SL/k), Profile complexity index (PCI) and slope-area relationship (Slr). Based on quantitative results of these geomorphology indices, this study suggests that the important factor influencing landscape of the Thoppaiyar sub-basin. Topographic map, IRS P6 LISS III satellite data, 10 m contour interval, SRTM data and ArcGIS 9.3 software were utilized. The contour lines of topographic maps of the main river and 14 micro basins are digitized as control points. Models of the longitudinal profiles using simple mathematical functions were made considering four functions for describing the form of longitudinal profiles. The abnormally high SL and SL/k values indicated that a decreasing trend from lower to mid-stream areas and the result of slope–area relationship also indicated that the regression line of the upper and lower steam exhibit an obvious right-shift could be explained by geodynamic models of active deformation in Thoppaiyar sub-basin.Keywords
River Profile, Gradient Index, Mid-Stream, Fluvial Geomorphology, Thoppaiyar.- Drought Hazard Assessment in Ponnaiyar River Basin, India Using Remote Sensing and Geographic Information System
Abstract Views :176 |
PDF Views:122
Authors
Affiliations
1 Centre for Geoinformatics and Planetary Studies, Periyar University, Salem-636011, Tamil Nadu, IN
1 Centre for Geoinformatics and Planetary Studies, Periyar University, Salem-636011, Tamil Nadu, IN
Source
International Journal of Earth Sciences and Engineering, Vol 10, No 2 (2017), Pagination: 247-256Abstract
Due to the increase of water demand and threatening climate change, in the recent years have witnessed much focus on global drought scenarios. In India, Tamil Nadu have deficient rainfall (921 mm) compared to national average of (1200 mm) leading to over-reliance on irrigation for agriculture, and increasing extraction of groundwater reserves (estimates show over 60 percent of reserves are already exhausted) pose a big issue for the future and its indicate the continuing susceptibility of the society to drought. This study demonstrates the cumulative drought hazard assessment using climatic, biophysical and social factors in the Ponnaiyar River basin, Tamil Nadu, India. It was hypothesized that the key climatic, biophysical and social factors that define meteorological drought hazard, it is rainfall, normalized deviation of rainfall whereas for agricultural drought hazard were soils, geomorphology, drainage density, land use, and relief, and for hydrological drought hazard, it is lithology, depth to water table, and surface water bodies. The construction for the derivation of an agricultural, meteorological, and hydrological drought hazard map was created through the development of a numerical weighting scheme to evaluate the drought potential of the classes within each factor. A cumulative map created through spatial join of all the three types of drought provided a drought hazard scenario in totality. The area with different severity of drought hazards under cumulative drought hazards scenario is about 40% of the area under high to very high drought scenario. It is revealed the immediate attention have made to groundwater development for sustainable environment in the study area.Keywords
Remote Sensing, GIS, Normalized Weight, Drought Hazard, Southern India.- Assessment of Land Use and Land Cover Changes in Magnesite Mining Region, Salem, India
Abstract Views :172 |
PDF Views:147
Authors
Affiliations
1 Centre for Geoinformatics and Planetary Studies, Department of Geology, Periyar University, Salem, IN
1 Centre for Geoinformatics and Planetary Studies, Department of Geology, Periyar University, Salem, IN