The layered Sittampundi Anorthosite Complex is covered by mafic and ultramafic rocks including an... more The layered Sittampundi Anorthosite Complex is covered by mafic and ultramafic rocks including anorthosite, gabbro, pyroxenite and other igneous rocks. The ultramafic terrain has frequently undergone metamorphism. In the present study, laboratory spectral measurements were carried out from mafic, ultramafic and felsic rocks in the 350–2500 nm spectral range to characterise their diagnostic spectral features and for further utilisation for rock-type mapping. In 2016, the Sittampundi complex was covered by an AVIRIS-NG airborne survey jointly conducted by the Space Application Centre (SAC-ISRO) and Jet Propulsion Laboratory (NASA). The level-2 AVIRIS-NG data was obtained from SAC and used to interpret various rock types. ENVI 5.3 software was used for digital image processing of the AVIRIS-NG airborne hyperspectral data. The continuum-removed spectra of major rock types including anorthosite, meta-anorthosite, gabbro, meta-gabbro, pyroxenite, pegmatite, granite, gneiss and migmatite w...
GIS and Geostatistical Techniques for Groundwater Science, 2019
Abstract The objective of this paper is to demarcate a suitable site for artificial recharge base... more Abstract The objective of this paper is to demarcate a suitable site for artificial recharge based on an aquifer management system in a hard rock area of Talaivasal block, Tamil Nadu, India using a fuzzy logic model. The important parameters, such as land use/land cover, geomorphology, drainage (stream order), lineament density, water level, and slope percentage, were chosen based on recharge characteristics. In the present study, knowledge-based weighted values were assigned for each thematic layer and these thematic maps were integrated into a fuzzy tool to determine membership values. Membership values were derived from thematic maps of each class, then fuzzy overlay analysis was carried out. The entire area has been classified as highly suitable, suitable, moderately suitable, least suitable, and unsuitable for artificial groundwater recharge. The results revealed that only 7.72% of the block was recognized as highly suitable for artificial recharge. Artificial recharge structures for aquifer management system were also suggested to increase groundwater levels for a sustainable environment in this block.
The present study emphasizes the application of fuzzy operators in landslide susceptibility mappi... more The present study emphasizes the application of fuzzy operators in landslide susceptibility mapping along Yercaud ghat road section in the state of Tamil Nadu, India. Yercaud is one of the important hill stations and tourist spot in Tamil Nadu. In recent times, it faces frequent landslide occurrences. There is a urgent need for detail study of landslides along the ghat road to prevent further slope failure. The study has been conducted through integrated remote sensing, GIS and field investigations. The existing landslide locations were collected from previous study and verified in the field. The slope gradient, slope aspect, relief, lithology, land cover, geomorphology, proximity to road, proximity to drainage and proximity to lineament were analyzed with the help of Survey of India topo map, published geology map and satellite data. The relationship between various causative factors with past landslide locations were compared using frequency ratio method. These frequency ratio val...
ABSTRACT Abstract: Landslides are the most common natural disaster in hilly terrain which causes ... more ABSTRACT Abstract: Landslides are the most common natural disaster in hilly terrain which causes changes in landscape and damage to life and property. The main objective of the present study was to carry out landslide hazard zonation mapping on 1:50,000 scale along ghat road section of Kolli hills using a Landslide Hazard Evaluation Factor (LHEF) rating scheme. The landslide hazard zonation map has been prepared by overlaying the terrain evaluation maps with facet map of the study area. The terrain evaluation maps include lithology, structure, slope morphometry, relative relief, land use and land cover and hydrogeological condition. The LHEF rating scheme and the Total Estimated Hazard (TEHD) were calculated as per the Bureau of Indian Standard (BIS) guidelines (IS:14496 (Part-2) 1998) for the purpose of preparation of Landslide Hazard Zonation (LHZ) map in mountainous terrains. The correction due to triggering factors such as seismicity, rainfall and anthropogenic activities were also incorporated with Total Estimated Hazard to get final corrected TEHD. The landslide hazard zonation map was classified as the high, moderate and low hazard zones along the ghat road section based on corrected TEHD.
... TAMIL NADU (il configuration of topsoil, weathered zone, fractured zone and massive rocks at ... more ... TAMIL NADU (il configuration of topsoil, weathered zone, fractured zone and massive rocks at depth. ... From such lineament data, the total length of lineaments per 250000 sq.m (0.25-sq.fcm) area were measured, plotted in the respective grid center and contoured. ...
Minerals and rocks show varying spectral reflectances under different spectral ranges of the elec... more Minerals and rocks show varying spectral reflectances under different spectral ranges of the electromagnetic spectrum and such spectral responses vary because of colour, texture, crystal structure, specific gravity and other physical and optical properties. Hence in order to optimise the spectral ranges which may be used in the recognition of the minerals and the rocks, spectral reflectance measurements were carried
Mining practices like granite quarries has associated with the various environmental problems dur... more Mining practices like granite quarries has associated with the various environmental problems during the exploration, blasting, transporting and the disposal of waste rock. Appraisal of land use and land cover changes in and around the granite quarries is one of the important tasks in order to trace the impacts on ecosystems such as land degradation, loss in biodiversity, pollution of water resources and degradation of scenery. Land use refers to man-made agricultural practices, construction of buildings and other activities. Land cover denotes naturally covered land units such as forest cover, barren land, outcrops and water bodies etc., In the present context, an assessment has been made in the context of the land use and land cover changes in the site of granite quarries in Krishnagiri District, South India using remote sensing techniques. In the first step, the Landsat satellite data procured for the year 1973, 1981, 1991, 2001, 2011 and 2018. The six decadal of images were classified using supervised classification and subsequently change detection was applied to measure the land use and land cover changes. Next, the normalized difference vegetation index (NDVI) was used to highlight the dynamics in vegetation cover around the quarry site. The granite quarries resulted in the development of water ponds within the quarries. Likewise, there are significant losses in vegetation and bare land. NDVI results has shown the variability in mean NDVI values in different time period. The trend of overall mean NDVI values showed that the most of the granite quarry site had retain the vegetation cover. Over all, less vegetation cover was observed 1981. The results revealed that the environmental assessment sustainable development and continuous monitoring in and around the granite quarry is warranted in the mining district. The mining industry has evolved significantly and allows for improved mapping and monitoring environmental impacts related to mining activities.
Journal of Geology, Geography and Geoecology, 2021
Landslides are among the most prevalent and harmful hazards. Assessment of landslide susceptibili... more Landslides are among the most prevalent and harmful hazards. Assessment of landslide susceptibility zonation is an important task in reducing the losses of lifeand properties. The present study aims to demarcate the landslide prone areas along the Vathalmalai Ghat road section (VGR) using remote sensing and GIS techniques. In the first step, the landslide causative factors such as geology, geomorphology, slope, slope aspect, land use / land cover, drainage density, lineament density, road buffer and relative relief were assessed. All the factors were assigned to rank and weight based on the slope stability of the landslide susceptibility zones. Then the thematic maps were integrated using ArcGIS tool and landslide susceptibility zonation was obtained and classified into five categories ; very low, low, moderate, high and very high. The landslide susceptibility map is validated with R-index and landslide inventory data collected from the field using GPS measurement. The distribution ...
IGARSS'97. 1997 IEEE International Geoscience and Remote Sensing Symposium Proceedings. Remote Sensing - A Scientific Vision for Sustainable Development
Introduction: The planetary scientists are using terrestrial analogs for several kinds of investi... more Introduction: The planetary scientists are using terrestrial analogs for several kinds of investigation and comparative studies between earth and other planets which is very important for understanding the geochemistry, morphological features, origin and evolution of the planetary bodies [1]. The terrestrial lunar equivalent Anorthositic samples could be used to gain significant and deeper knowledge on lunar highland surface composition and primordial crust. The Anorthosite is composed of calcium rich plagioclase, is the typical rock unit found on lunar highland regions which is representing the oldest crustal lithological units on the moon [2]. The terrestrial anorthosite occurrences fall into a few genetic ‘types’ or ‘associations’ such as: (i) Archaean (>2500 million years (Ma)) megacrystic, (ii) Proterozoic massif type (2500– 500 Ma) and (iii) components of layered mafic and ultramafic igneous plutons [1, 3, 4]. In southern peninsular India, there are number of anorthosite co...
Introduction: Mars has several tectonic imprints on its surface. Several studies were conducted o... more Introduction: Mars has several tectonic imprints on its surface. Several studies were conducted on tectonic evolution, formation of graben structure, fault topography and tectonics associated with volcanism [1, 2, 3 & 4]. Graben structures on Martian surface might have developed due to isostatic stresses in the volcanic region, flexural bending stresses and deformation, surface expression of giant dykes and magmatic processes [5,6, 7, 8 & 9]. Borraccini et al (2007) have conducted detailed tectonic evolution study in the eastern regions of the Thaumasia plateau. They related the orientation of lineaments and graben structures with different time period. In the present study, we have done structural mapping of Cusus Valles and inferred that the valles formation controlled by graben structure. Cusus Valles located in the south east of Cassini crater at 14.34 0 N 50.5 0 E on Mars. Cusus valles and its channels were probably carved out along structural discontinuities by flooding during...
The layered Sittampundi Anorthosite Complex is covered by mafic and ultramafic rocks including an... more The layered Sittampundi Anorthosite Complex is covered by mafic and ultramafic rocks including anorthosite, gabbro, pyroxenite and other igneous rocks. The ultramafic terrain has frequently undergone metamorphism. In the present study, laboratory spectral measurements were carried out from mafic, ultramafic and felsic rocks in the 350–2500 nm spectral range to characterise their diagnostic spectral features and for further utilisation for rock-type mapping. In 2016, the Sittampundi complex was covered by an AVIRIS-NG airborne survey jointly conducted by the Space Application Centre (SAC-ISRO) and Jet Propulsion Laboratory (NASA). The level-2 AVIRIS-NG data was obtained from SAC and used to interpret various rock types. ENVI 5.3 software was used for digital image processing of the AVIRIS-NG airborne hyperspectral data. The continuum-removed spectra of major rock types including anorthosite, meta-anorthosite, gabbro, meta-gabbro, pyroxenite, pegmatite, granite, gneiss and migmatite w...
GIS and Geostatistical Techniques for Groundwater Science, 2019
Abstract The objective of this paper is to demarcate a suitable site for artificial recharge base... more Abstract The objective of this paper is to demarcate a suitable site for artificial recharge based on an aquifer management system in a hard rock area of Talaivasal block, Tamil Nadu, India using a fuzzy logic model. The important parameters, such as land use/land cover, geomorphology, drainage (stream order), lineament density, water level, and slope percentage, were chosen based on recharge characteristics. In the present study, knowledge-based weighted values were assigned for each thematic layer and these thematic maps were integrated into a fuzzy tool to determine membership values. Membership values were derived from thematic maps of each class, then fuzzy overlay analysis was carried out. The entire area has been classified as highly suitable, suitable, moderately suitable, least suitable, and unsuitable for artificial groundwater recharge. The results revealed that only 7.72% of the block was recognized as highly suitable for artificial recharge. Artificial recharge structures for aquifer management system were also suggested to increase groundwater levels for a sustainable environment in this block.
The present study emphasizes the application of fuzzy operators in landslide susceptibility mappi... more The present study emphasizes the application of fuzzy operators in landslide susceptibility mapping along Yercaud ghat road section in the state of Tamil Nadu, India. Yercaud is one of the important hill stations and tourist spot in Tamil Nadu. In recent times, it faces frequent landslide occurrences. There is a urgent need for detail study of landslides along the ghat road to prevent further slope failure. The study has been conducted through integrated remote sensing, GIS and field investigations. The existing landslide locations were collected from previous study and verified in the field. The slope gradient, slope aspect, relief, lithology, land cover, geomorphology, proximity to road, proximity to drainage and proximity to lineament were analyzed with the help of Survey of India topo map, published geology map and satellite data. The relationship between various causative factors with past landslide locations were compared using frequency ratio method. These frequency ratio val...
ABSTRACT Abstract: Landslides are the most common natural disaster in hilly terrain which causes ... more ABSTRACT Abstract: Landslides are the most common natural disaster in hilly terrain which causes changes in landscape and damage to life and property. The main objective of the present study was to carry out landslide hazard zonation mapping on 1:50,000 scale along ghat road section of Kolli hills using a Landslide Hazard Evaluation Factor (LHEF) rating scheme. The landslide hazard zonation map has been prepared by overlaying the terrain evaluation maps with facet map of the study area. The terrain evaluation maps include lithology, structure, slope morphometry, relative relief, land use and land cover and hydrogeological condition. The LHEF rating scheme and the Total Estimated Hazard (TEHD) were calculated as per the Bureau of Indian Standard (BIS) guidelines (IS:14496 (Part-2) 1998) for the purpose of preparation of Landslide Hazard Zonation (LHZ) map in mountainous terrains. The correction due to triggering factors such as seismicity, rainfall and anthropogenic activities were also incorporated with Total Estimated Hazard to get final corrected TEHD. The landslide hazard zonation map was classified as the high, moderate and low hazard zones along the ghat road section based on corrected TEHD.
... TAMIL NADU (il configuration of topsoil, weathered zone, fractured zone and massive rocks at ... more ... TAMIL NADU (il configuration of topsoil, weathered zone, fractured zone and massive rocks at depth. ... From such lineament data, the total length of lineaments per 250000 sq.m (0.25-sq.fcm) area were measured, plotted in the respective grid center and contoured. ...
Minerals and rocks show varying spectral reflectances under different spectral ranges of the elec... more Minerals and rocks show varying spectral reflectances under different spectral ranges of the electromagnetic spectrum and such spectral responses vary because of colour, texture, crystal structure, specific gravity and other physical and optical properties. Hence in order to optimise the spectral ranges which may be used in the recognition of the minerals and the rocks, spectral reflectance measurements were carried
Mining practices like granite quarries has associated with the various environmental problems dur... more Mining practices like granite quarries has associated with the various environmental problems during the exploration, blasting, transporting and the disposal of waste rock. Appraisal of land use and land cover changes in and around the granite quarries is one of the important tasks in order to trace the impacts on ecosystems such as land degradation, loss in biodiversity, pollution of water resources and degradation of scenery. Land use refers to man-made agricultural practices, construction of buildings and other activities. Land cover denotes naturally covered land units such as forest cover, barren land, outcrops and water bodies etc., In the present context, an assessment has been made in the context of the land use and land cover changes in the site of granite quarries in Krishnagiri District, South India using remote sensing techniques. In the first step, the Landsat satellite data procured for the year 1973, 1981, 1991, 2001, 2011 and 2018. The six decadal of images were classified using supervised classification and subsequently change detection was applied to measure the land use and land cover changes. Next, the normalized difference vegetation index (NDVI) was used to highlight the dynamics in vegetation cover around the quarry site. The granite quarries resulted in the development of water ponds within the quarries. Likewise, there are significant losses in vegetation and bare land. NDVI results has shown the variability in mean NDVI values in different time period. The trend of overall mean NDVI values showed that the most of the granite quarry site had retain the vegetation cover. Over all, less vegetation cover was observed 1981. The results revealed that the environmental assessment sustainable development and continuous monitoring in and around the granite quarry is warranted in the mining district. The mining industry has evolved significantly and allows for improved mapping and monitoring environmental impacts related to mining activities.
Journal of Geology, Geography and Geoecology, 2021
Landslides are among the most prevalent and harmful hazards. Assessment of landslide susceptibili... more Landslides are among the most prevalent and harmful hazards. Assessment of landslide susceptibility zonation is an important task in reducing the losses of lifeand properties. The present study aims to demarcate the landslide prone areas along the Vathalmalai Ghat road section (VGR) using remote sensing and GIS techniques. In the first step, the landslide causative factors such as geology, geomorphology, slope, slope aspect, land use / land cover, drainage density, lineament density, road buffer and relative relief were assessed. All the factors were assigned to rank and weight based on the slope stability of the landslide susceptibility zones. Then the thematic maps were integrated using ArcGIS tool and landslide susceptibility zonation was obtained and classified into five categories ; very low, low, moderate, high and very high. The landslide susceptibility map is validated with R-index and landslide inventory data collected from the field using GPS measurement. The distribution ...
IGARSS'97. 1997 IEEE International Geoscience and Remote Sensing Symposium Proceedings. Remote Sensing - A Scientific Vision for Sustainable Development
Introduction: The planetary scientists are using terrestrial analogs for several kinds of investi... more Introduction: The planetary scientists are using terrestrial analogs for several kinds of investigation and comparative studies between earth and other planets which is very important for understanding the geochemistry, morphological features, origin and evolution of the planetary bodies [1]. The terrestrial lunar equivalent Anorthositic samples could be used to gain significant and deeper knowledge on lunar highland surface composition and primordial crust. The Anorthosite is composed of calcium rich plagioclase, is the typical rock unit found on lunar highland regions which is representing the oldest crustal lithological units on the moon [2]. The terrestrial anorthosite occurrences fall into a few genetic ‘types’ or ‘associations’ such as: (i) Archaean (>2500 million years (Ma)) megacrystic, (ii) Proterozoic massif type (2500– 500 Ma) and (iii) components of layered mafic and ultramafic igneous plutons [1, 3, 4]. In southern peninsular India, there are number of anorthosite co...
Introduction: Mars has several tectonic imprints on its surface. Several studies were conducted o... more Introduction: Mars has several tectonic imprints on its surface. Several studies were conducted on tectonic evolution, formation of graben structure, fault topography and tectonics associated with volcanism [1, 2, 3 & 4]. Graben structures on Martian surface might have developed due to isostatic stresses in the volcanic region, flexural bending stresses and deformation, surface expression of giant dykes and magmatic processes [5,6, 7, 8 & 9]. Borraccini et al (2007) have conducted detailed tectonic evolution study in the eastern regions of the Thaumasia plateau. They related the orientation of lineaments and graben structures with different time period. In the present study, we have done structural mapping of Cusus Valles and inferred that the valles formation controlled by graben structure. Cusus Valles located in the south east of Cassini crater at 14.34 0 N 50.5 0 E on Mars. Cusus valles and its channels were probably carved out along structural discontinuities by flooding during...
Uploads
Papers by S Anbazhagan