P Ravikumar | Bangalore University (original) (raw)
Papers by P Ravikumar
The present study focuses on the assessment of forest encroachment in Belgaum district of Karnata... more The present study focuses on the assessment of forest encroachment in Belgaum district of Karnataka for the year 1975, 1990, 2000 and 2010 using RS and GIS. The study area is located in the north-western part of Karnataka state, with a total area of 13,415 km2.The study revealed that the forest encroachment is 4245.6, 16133.1, 28304.4 and 29010.0 ha for the year 1975, 1990, 2000 and 2010 respectively. The extent of encroachment in 2010 amounted to 9.66 % in evergreen to semi evergreen, 15.84 % moist deciduous and 74.50 % in scrub forests.The highest percentage of encroachment was in Hukkeri taluk with mixed plantation and the major part was scrubland whose average encroached area was 31.38% over the years. The major factors accelerating encroachments were agricultural expansion, population dependency on forest livelihood, limited land for cultivation, lack of grazing land and poverty.
Ambient air quality monitoring was carried out in the vicinity of dam and nearby residential site... more Ambient air quality monitoring was carried out in the vicinity of dam and nearby residential sites in four river basins in Karnataka with reference to SPM, RSPM, SO2 and NOx, employing Envirotech APM-460 Respirable Dust Sampler with provision to keep impingers having absorbing reagent. Further, three different methods of Air quality index (AQI) calculation on based on SPM and RSPM values were used to evaluate the prevailed ambient air quality in the near and surroundings areas at the time of dam constructional activities. The concentrations of SPM, RSPM, SO2 and NOx near the dam sites were respectively 540, 170, 5.8 and 17.9 .g/m3 in Varahi river basin; 440, 158, 3.8 and 11.4 .g/m3 in SLIS river basin and, 255.55, 83.3, 2.0 and 1.7.g/m3 in SRLIS river basin. The SPM, RSPM and SO2 concentrations was 340, 70 and 0.3 .g/m3 in the vicinity of dam site of Bellary nala river basin while NOx concentration was below the detectable limit. AQI calculations revealed that the dam sites in all f...
Journal of Radioanalytical and Nuclear Chemistry, 2021
Radon activity concentrations have been measured by analysing a total of 93 bore well water sampl... more Radon activity concentrations have been measured by analysing a total of 93 bore well water samples, geographically spread over three taluks of Yadagir district. The analysis involved usage of Durridge’s RAD7 radon analyser equipment with RAD-H2O accessories by closed loop aeration concept. Having geometric mean concentrations of 37.0, 20.75 and 9.98 Bq/L, radon concentration in 5.71, 14.29 and 6.67% groundwater samples from Yadagir (8.88 Bq/L < Rn < 160 Bq/L), Shahapur (1.98 Bq/L < Rn < 591 Bq/L) and Surpur (0.586 Bq/L < Rn < 206 Bq/L) taluks respectively exceeded the alternative maximum contaminant level (AMCL) of the USEPA (148 Bq/L). Nearly 15% of the groundwater samples had radon concentrations higher than WHO reference level of 100 Bq/L. The calculated total annual effective dose in 38.71, 44.09, and 55.92% of the samples respectively for infants, children and adults was not in consistent with WHO recommended dose level of 100 µSv/y.
Environmental Research, Engineering and Management, 2015
International Journal of Environmental Science and Technology, 2014
Clean Technologies and Environmental Policy, 2009
Applied Water Science, 2013
Journal of Waste Water Treatment & Analysis, 2012
Journal of the Indian Society of Remote Sensing, 2009
Journal of Radioanalytical and Nuclear Chemistry, 2010
Page 1. Radon concentration in groundwater of Varahi and Markandeya river basins, Karnataka State... more Page 1. Radon concentration in groundwater of Varahi and Markandeya river basins, Karnataka State, India RK Somashekar P. Ravikumar Received: 9 March 2010 / Published online: 1 May 2010 Ó Akadémiai Kiadó, Budapest, Hungary 2010 ...
Journal of Radioanalytical and Nuclear Chemistry, 2011
Journal of Environmental Radioactivity, 2011
Environmental Monitoring and Assessment, 2011
Environmental Monitoring and Assessment, 2011
Environmental Monitoring and Assessment, 2011
Chinese Journal of Geochemistry, 2011
The concentration of radon in the air in buildings ranged from 1.87 ± 3.24 Bq/m3 to 14.27 ± 1.50 ... more The concentration of radon in the air in buildings ranged from 1.87 ± 3.24 Bq/m3 to 14.27 ± 1.50 Bq/m3 with a mean of 6.31 ± 3.47 Bq/m3 while that of the progeny of radon varied from 0.007 to 0.057 WL (average: 0.025). The mean indoor concentration of radon was considerably less than the lower levels prescribed by EPA (148 Bq/m3), WHO (100 Bq/m3), EEC (400 Bq/m3), ICRP (200–600 Bq/m3) and NRPB (200 Bq/m3). The annual effective equivalent dose of indoor radon (< 0.8 mSv/y) that the bronchial and pulmonary regions of human lungs are exposed to (<0.8 mSv/y) is less than the UNSCEAR and WHO recommended global lower average dose value of 1 mSv/y. The lifetime fatality risk of exposure to the progeny of radon (PAEC) varied from 0.03 × 10−4 to 0.19 × 10−4, with an average value of 0.08 ± 0.04 × 10−4.
The concentration of radon in the air in buildings ranged from 1.87 ± 3.24 Bq/m3 to 14.27 ± 1.50 ... more The concentration of radon in the air in buildings ranged from 1.87 ± 3.24 Bq/m3 to 14.27 ± 1.50 Bq/m3 with a mean of 6.31 ± 3.47 Bq/m3 while that of the progeny of radon varied from 0.007 to 0.057 WL (average: 0.025). The mean indoor concentration of radon was considerably less than the lower levels prescribed by EPA (148 Bq/m3), WHO (100 Bq/m3), EEC (400 Bq/m3), ICRP (200–600 Bq/m3) and NRPB (200 Bq/m3). The annual effective equivalent dose of indoor radon (< 0.8 mSv/y) that the bronchial and pulmonary regions of human lungs are exposed to (<0.8 mSv/y) is less than the UNSCEAR and WHO recommended global lower average dose value of 1 mSv/y. The lifetime fatality risk of exposure to the progeny of radon (PAEC) varied from 0.03 × 10−4 to 0.19 × 10−4, with an average value of 0.08 ± 0.04 × 10−4.
The present study focuses on the assessment of forest encroachment in Belgaum district of Karnata... more The present study focuses on the assessment of forest encroachment in Belgaum district of Karnataka for the year 1975, 1990, 2000 and 2010 using RS and GIS. The study area is located in the north-western part of Karnataka state, with a total area of 13,415 km2.The study revealed that the forest encroachment is 4245.6, 16133.1, 28304.4 and 29010.0 ha for the year 1975, 1990, 2000 and 2010 respectively. The extent of encroachment in 2010 amounted to 9.66 % in evergreen to semi evergreen, 15.84 % moist deciduous and 74.50 % in scrub forests.The highest percentage of encroachment was in Hukkeri taluk with mixed plantation and the major part was scrubland whose average encroached area was 31.38% over the years. The major factors accelerating encroachments were agricultural expansion, population dependency on forest livelihood, limited land for cultivation, lack of grazing land and poverty.
Ambient air quality monitoring was carried out in the vicinity of dam and nearby residential site... more Ambient air quality monitoring was carried out in the vicinity of dam and nearby residential sites in four river basins in Karnataka with reference to SPM, RSPM, SO2 and NOx, employing Envirotech APM-460 Respirable Dust Sampler with provision to keep impingers having absorbing reagent. Further, three different methods of Air quality index (AQI) calculation on based on SPM and RSPM values were used to evaluate the prevailed ambient air quality in the near and surroundings areas at the time of dam constructional activities. The concentrations of SPM, RSPM, SO2 and NOx near the dam sites were respectively 540, 170, 5.8 and 17.9 .g/m3 in Varahi river basin; 440, 158, 3.8 and 11.4 .g/m3 in SLIS river basin and, 255.55, 83.3, 2.0 and 1.7.g/m3 in SRLIS river basin. The SPM, RSPM and SO2 concentrations was 340, 70 and 0.3 .g/m3 in the vicinity of dam site of Bellary nala river basin while NOx concentration was below the detectable limit. AQI calculations revealed that the dam sites in all f...
Journal of Radioanalytical and Nuclear Chemistry, 2021
Radon activity concentrations have been measured by analysing a total of 93 bore well water sampl... more Radon activity concentrations have been measured by analysing a total of 93 bore well water samples, geographically spread over three taluks of Yadagir district. The analysis involved usage of Durridge’s RAD7 radon analyser equipment with RAD-H2O accessories by closed loop aeration concept. Having geometric mean concentrations of 37.0, 20.75 and 9.98 Bq/L, radon concentration in 5.71, 14.29 and 6.67% groundwater samples from Yadagir (8.88 Bq/L < Rn < 160 Bq/L), Shahapur (1.98 Bq/L < Rn < 591 Bq/L) and Surpur (0.586 Bq/L < Rn < 206 Bq/L) taluks respectively exceeded the alternative maximum contaminant level (AMCL) of the USEPA (148 Bq/L). Nearly 15% of the groundwater samples had radon concentrations higher than WHO reference level of 100 Bq/L. The calculated total annual effective dose in 38.71, 44.09, and 55.92% of the samples respectively for infants, children and adults was not in consistent with WHO recommended dose level of 100 µSv/y.
Environmental Research, Engineering and Management, 2015
International Journal of Environmental Science and Technology, 2014
Clean Technologies and Environmental Policy, 2009
Applied Water Science, 2013
Journal of Waste Water Treatment & Analysis, 2012
Journal of the Indian Society of Remote Sensing, 2009
Journal of Radioanalytical and Nuclear Chemistry, 2010
Page 1. Radon concentration in groundwater of Varahi and Markandeya river basins, Karnataka State... more Page 1. Radon concentration in groundwater of Varahi and Markandeya river basins, Karnataka State, India RK Somashekar P. Ravikumar Received: 9 March 2010 / Published online: 1 May 2010 Ó Akadémiai Kiadó, Budapest, Hungary 2010 ...
Journal of Radioanalytical and Nuclear Chemistry, 2011
Journal of Environmental Radioactivity, 2011
Environmental Monitoring and Assessment, 2011
Environmental Monitoring and Assessment, 2011
Environmental Monitoring and Assessment, 2011
Chinese Journal of Geochemistry, 2011
The concentration of radon in the air in buildings ranged from 1.87 ± 3.24 Bq/m3 to 14.27 ± 1.50 ... more The concentration of radon in the air in buildings ranged from 1.87 ± 3.24 Bq/m3 to 14.27 ± 1.50 Bq/m3 with a mean of 6.31 ± 3.47 Bq/m3 while that of the progeny of radon varied from 0.007 to 0.057 WL (average: 0.025). The mean indoor concentration of radon was considerably less than the lower levels prescribed by EPA (148 Bq/m3), WHO (100 Bq/m3), EEC (400 Bq/m3), ICRP (200–600 Bq/m3) and NRPB (200 Bq/m3). The annual effective equivalent dose of indoor radon (< 0.8 mSv/y) that the bronchial and pulmonary regions of human lungs are exposed to (<0.8 mSv/y) is less than the UNSCEAR and WHO recommended global lower average dose value of 1 mSv/y. The lifetime fatality risk of exposure to the progeny of radon (PAEC) varied from 0.03 × 10−4 to 0.19 × 10−4, with an average value of 0.08 ± 0.04 × 10−4.
The concentration of radon in the air in buildings ranged from 1.87 ± 3.24 Bq/m3 to 14.27 ± 1.50 ... more The concentration of radon in the air in buildings ranged from 1.87 ± 3.24 Bq/m3 to 14.27 ± 1.50 Bq/m3 with a mean of 6.31 ± 3.47 Bq/m3 while that of the progeny of radon varied from 0.007 to 0.057 WL (average: 0.025). The mean indoor concentration of radon was considerably less than the lower levels prescribed by EPA (148 Bq/m3), WHO (100 Bq/m3), EEC (400 Bq/m3), ICRP (200–600 Bq/m3) and NRPB (200 Bq/m3). The annual effective equivalent dose of indoor radon (< 0.8 mSv/y) that the bronchial and pulmonary regions of human lungs are exposed to (<0.8 mSv/y) is less than the UNSCEAR and WHO recommended global lower average dose value of 1 mSv/y. The lifetime fatality risk of exposure to the progeny of radon (PAEC) varied from 0.03 × 10−4 to 0.19 × 10−4, with an average value of 0.08 ± 0.04 × 10−4.