Papers by Dr Nethajimariappan Velu Ethirajan
ABSTARCT The temporal variation water quality of Tiruvallur district was assessed using intermitt... more ABSTARCT The temporal variation water quality of Tiruvallur district was assessed using intermittent historical data (1975-80; 85-90; 95-2000; 05-10) for 24 years. Groundwater data includes both pre monsoon (June) and post monsoon (December/January) data evenly distributed. Spatially data were collected from about 45 villages within the ambit of Tiruvallur district. Nine physio-chemical parameters viz., pH, E.C. TDS, Total Hardness, Calcium, Magnesium, Bi Carbonate, Sodium and Chlorides were utilized for water quality assessment. In order to understand the water quality in accordance to drinking purpose the same has been verified with WHO and BIS standards. Water Quality Index was arrived for year wise data (pre monsoon and post monsoon) for minimum, maximum and mean values. The results reveal that WQI derived for pre and post monsoon minimum values exhibited excellent water suitable for drinking purpose, upon pre and post monsoon maximum values deems unsuitable for drinking. WQI of mean of pre and post monsoon values significantly showed poor water quality. Results of the analysis of historical mean value water quality index, majority of the samples fall under poor water quality and not suitable drinking water purpose. There need to be a change in water quality standards exclusively for coastal regions with higher ground water extraction, sea water intrusion and at industrial zones.
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Hyperspectral remote sensing sensors have the ability to acquire images in many narrow spectral b... more Hyperspectral remote sensing sensors have the ability to acquire images in many narrow spectral bands that are found in the electromagnetic spectrum from visible, near infrared, medium infrared to thermal infrared. Hyperspectral sensors capture energy in 200 bands or more which means that they continuously cover the reflecting spectrum for each pixel in the scene. Bands characteristic for these types of sensors are continuous and narrow, allowing an in depth examination of features and details on Earth which recorded with multispectral sensors would be lost. The benefits of Hyperion hyperspectral data to LULC mapping have been studied at sites over some areas of Nilgiris district. The purpose of this study is to analyze the classification of hyperspectral images using Principal Component Analysis (PCA) and Independent Component Analysis (ICA). Hyperspectral imagery provides the potential for more accurate and detailed information extraction than is possible with other types of remot...
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One of the main environmental problems which affect extensive areas in the world is soil salinity... more One of the main environmental problems which affect extensive areas in the world is soil salinity. Soil salinization is a problem associated with irrigation in arid and semi- arid environments; even more so when reclaimed water is applied. Traditional data collection methods are neither enough for considering this important environmental problem nor accurate for soil studies. Remote sensing data could overcome most of these problems. Although satellite images are commonly used for these studies, however there are still needs to find the best calibration between the data and real situations in each specified area. Soil survey delineation at a scale of 1:25000 and mapping of salinity phases at a regional scale could serve as the basis for improved decision making, or highlight areas for further investigation. Soil salinity survey at a regional scale remains a challenge. Therefore, study was to promote geospatial technology as a main source of mapping soil salinity at different scales ...
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Electronic waste or E-waste of a product is scrap or discarded electronic devices or electrical d... more Electronic waste or E-waste of a product is scrap or discarded electronic devices or electrical devices which has come to an end of their usage or life span. These E-waste contains lot of hazardous substances and contents which are harmful for humans as well as environment. In the recent years our nation is driving towards digitization there by leading in the generation of huge amount E-waste materials every year. Informal processing of E-waste in the developed countries like India will possess great threat to environment and there by leading to the environmental pollution. To address potential environmental problems that could stem from improper management of WEEE, many countries and organizations have drafted national legislation to improve the reuse, recycling and other forms of material recovery from WEEE to reduce the amount and types of materials disposed in landfills. Although most EEE waste is associated with the developing countries „living standards‟. One theory is that in...
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International journal of Bio-resource and Stress Management, 2021
Three varieties of groundnut were used to assess the drought tolerance and high yielding potentia... more Three varieties of groundnut were used to assess the drought tolerance and high yielding potential. Groundnut (Arachis hypogaea L.) is an important oil seed crop mainly grown under rainfed situation. Erratic rainfall and frequent drought during the crop growth period, groundnut yields are generally low under rainfed conditions. Drought during critical crop growth stages is crucial for loss in yield of groundnut varieties. But tolerant genotypes may give better yield due to maintenance of physiological responses that were triggered during drought. On Farm Trials was conducted by Krishi Vigyan Kendra, Hansroever campus, Perambalur district in Tamilnadu, India to assess suitable drought tolerant and high yielding groundnut variety in terms of yield, acceptability and adoption potential during rabi 2018-19 in Perambalur district, India. Three varieties of groundnut were used to assess the drought tolerance and high yielding potential viz., Dharani, Co7 and TMV 7. The study revealed that...
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Mining and quarrying industry is one of the supporting sectors of construction industry and is cl... more Mining and quarrying industry is one of the supporting sectors of construction industry and is closely linked with a community of transportation sector. A larger section of the society is directly or indirectly involved in this web of industrial sectors. The demand for building materials have increased manifold during the last few couple of years due to development of service sectors resulting in the gregarious growth of construction Industry. In order to meet out the increasing demand, many small scale quarries are being opened in different parts of the Tamil Nadu particularly around the Chennai City. Since it is not a large scale industry in the State of Tamil Nadu and more over due to the above mentioned reasons most of the quarries are not well equipped with required safety measures. The above factors hinder the implementation of sudden drastic corrective measures in mining and quarrying sector. Therefore a study has been taken up on a crusher unit within the quarry site of Thir...
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ABSTARCT The temporal variation water quality of Tiruvallur district was assessed using intermitt... more ABSTARCT The temporal variation water quality of Tiruvallur district was assessed using intermittent historical data (1975-80; 85-90; 95-2000; 05-10) for 24 years. Groundwater data includes both pre monsoon (June) and post monsoon (December/January) data evenly distributed. Spatially data were collected from about 45 villages within the ambit of Tiruvallur district. Nine physio-chemical parameters viz., pH, E.C. TDS, Total Hardness, Calcium, Magnesium, Bi Carbonate, Sodium and Chlorides were utilized for water quality assessment. In order to understand the water quality in accordance to drinking purpose the same has been verified with WHO and BIS standards. Water Quality Index was arrived for year wise data (pre monsoon and post monsoon) for minimum, maximum and mean values. The results reveal that WQI derived for pre and post monsoon minimum values exhibited excellent water suitable for drinking purpose, upon pre and post monsoon maximum values deems unsuitable for drinking. WQI of mean of pre and post monsoon values significantly showed poor water quality. Results of the analysis of historical mean value water quality index, majority of the samples fall under poor water quality and not suitable drinking water purpose. There need to be a change in water quality standards exclusively for coastal regions with higher ground water extraction, sea water intrusion and at industrial zones.
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Hyperspectral remote sensing sensors have the ability to acquire images in many narrow spectral b... more Hyperspectral remote sensing sensors have the ability to acquire images in many narrow spectral bands that are found in the electromagnetic spectrum from visible, near infrared, medium infrared to thermal infrared. Hyperspectral sensors capture energy in 200 bands or more which means that they continuously cover the reflecting spectrum for each pixel in the scene. Bands characteristic for these types of sensors are continuous and narrow, allowing an in depth examination of features and details on Earth which recorded with multispectral sensors would be lost. The benefits of Hyperion hyperspectral data to LULC mapping have been studied at sites over some areas of Nilgiris district. The purpose of this study is to analyze the classification of hyperspectral images using Principal Component Analysis (PCA) and Independent Component Analysis (ICA). Hyperspectral imagery provides the potential for more accurate and detailed information extraction than is possible with other types of remot...
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One of the main environmental problems which affect extensive areas in the world is soil salinity... more One of the main environmental problems which affect extensive areas in the world is soil salinity. Soil salinization is a problem associated with irrigation in arid and semi- arid environments; even more so when reclaimed water is applied. Traditional data collection methods are neither enough for considering this important environmental problem nor accurate for soil studies. Remote sensing data could overcome most of these problems. Although satellite images are commonly used for these studies, however there are still needs to find the best calibration between the data and real situations in each specified area. Soil survey delineation at a scale of 1:25000 and mapping of salinity phases at a regional scale could serve as the basis for improved decision making, or highlight areas for further investigation. Soil salinity survey at a regional scale remains a challenge. Therefore, study was to promote geospatial technology as a main source of mapping soil salinity at different scales ...
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Electronic waste or E-waste of a product is scrap or discarded electronic devices or electrical d... more Electronic waste or E-waste of a product is scrap or discarded electronic devices or electrical devices which has come to an end of their usage or life span. These E-waste contains lot of hazardous substances and contents which are harmful for humans as well as environment. In the recent years our nation is driving towards digitization there by leading in the generation of huge amount E-waste materials every year. Informal processing of E-waste in the developed countries like India will possess great threat to environment and there by leading to the environmental pollution. To address potential environmental problems that could stem from improper management of WEEE, many countries and organizations have drafted national legislation to improve the reuse, recycling and other forms of material recovery from WEEE to reduce the amount and types of materials disposed in landfills. Although most EEE waste is associated with the developing countries „living standards‟. One theory is that in...
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International journal of Bio-resource and Stress Management, 2021
Three varieties of groundnut were used to assess the drought tolerance and high yielding potentia... more Three varieties of groundnut were used to assess the drought tolerance and high yielding potential. Groundnut (Arachis hypogaea L.) is an important oil seed crop mainly grown under rainfed situation. Erratic rainfall and frequent drought during the crop growth period, groundnut yields are generally low under rainfed conditions. Drought during critical crop growth stages is crucial for loss in yield of groundnut varieties. But tolerant genotypes may give better yield due to maintenance of physiological responses that were triggered during drought. On Farm Trials was conducted by Krishi Vigyan Kendra, Hansroever campus, Perambalur district in Tamilnadu, India to assess suitable drought tolerant and high yielding groundnut variety in terms of yield, acceptability and adoption potential during rabi 2018-19 in Perambalur district, India. Three varieties of groundnut were used to assess the drought tolerance and high yielding potential viz., Dharani, Co7 and TMV 7. The study revealed that...
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Lithology of Chennai region associated with rapid horizontal and vertical expansion is the major ... more Lithology of Chennai region associated with rapid horizontal and vertical expansion is the major causes of flooding in urban areas especially during monsoon seasons. Urban storm water influences the service life of urban infrastructures. The rainfall intensity and characteristics of catchment area are the major factors for designing urban storm water drainage facilities. Urban flooding was primarily a concern of municipal and environmental governance, and has now attained the status of ‘disaster’, which has drawn the attention of environmental scientists and disaster managers. Chennai is bounded on the east by Bay of Bengal and on the remaining three sides by Kanchipuram and Tiruvallur districts. Chennai receives approximately 1300 mm of rainfall per year on an average most of this (~800 mm) falls during the northeast (NE) monsoon in the months of October through December. Chennai city currently encompasses a metropolitan area of almost 426.5 km2. Study area, Periyar Nagar comes und...
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Lithology of Chennai region associated with rapid horizontal and vertical expansion is the major ... more Lithology of Chennai region associated with rapid horizontal and vertical expansion is the major causes of flooding in urban areas especially during monsoon seasons. Urban storm water influences the service life of urban infrastructures. The rainfall intensity and characteristics of catchment area are the major factors for designing urban storm water drainage facilities. Urban flooding was primarily a concern of municipal and environmental governance, and has now attained the status of ‘disaster’, which has drawn the attention of environmental scientists and disaster managers. Chennai is bounded on the east by Bay of Bengal and on the remaining three sides by Kanchipuram and Tiruvallur districts. Chennai receives approximately 1300 mm of rainfall per year on an average most of this (~800 mm) falls during the northeast (NE) monsoon in the months of October through December. Chennai city currently encompasses a metropolitan area of almost 426.5 km2. Study area, Periyar Nagar comes und...
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Agricultural Reviews, 2020
Peanut is a legume crop that belongs to the family of Fabaceae, genus Arachis, and botanically na... more Peanut is a legume crop that belongs to the family of Fabaceae, genus Arachis, and botanically named as Arachis hypogaea L. Peanuts are considered as a vital source of nutrients plays an important role in growth and energy gain of living organisms. They are rich in calories and contain many nutrients, minerals, antioxidants, and vitamins that are essential for optimum health. All these biomolecules are essential for pumping vital nutrients into the human body for sustaining normal health. This paper presents an overview of the peanut composition in terms of the constituent biomolecules and their biological functions, also discusses about the relationship between consumption of peanuts and their effect on human metabolism and physiology. It highlights the usefulness of considering peanuts as an essential component in human diet considering its nutritional values.
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International Journal on Applied Bio-Engineering, 2013
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International Journal of Current Research in Biosciences and Plant Biology, 2017
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Recent Advances in Space Technology Services and Climate Change 2010 (RSTS & CC-2010), 2010
Abstract-Tamilnadu is a water scared state deficient in both ground water and surface water. Effi... more Abstract-Tamilnadu is a water scared state deficient in both ground water and surface water. Efficient water management techniques are required for maximizing yield of any crop that requires estimating crop water requirement in a reliable manner and realistic manner. ...
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Water resources are finite natural resources and are precious national assets. No living organism... more Water resources are finite natural resources and are precious national assets. No living organisms can survive without water; agriculture is dependent on surface and ground water resources. The major Tsunami of December 26, 2004 had a profound impact on the south eastern coast of India. The ground water and surface water resources have been pollute by Tsunami due to saline water incursion and deposited sand mud in the fields and ponds that served as irrigation and drinking sources. A key concern is the nature and extent of the tsunami impact on the water supply and, in more general, the water resources of these areas. In the coastal areas of southern India, the majority of the population, which is rural or semi-urban, is relying on groundwater for their domestic and agricultural activities. About 810 km of Tamilnadu line was worst affected and 11 district were affected by Tsunami. Out of these districts, Nagapattinam was affected badly and ground water has been polluted due to salin...
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The study area comprise Chennai coast covering a linear extent of 10 Km from Kovalam to Mamallapu... more The study area comprise Chennai coast covering a linear extent of 10 Km from Kovalam to Mamallapuram, Kancheepuram district. Geographically study area lies between 120 35’ to 120 50’ East Latitude and 800 12’ to 800 16’ North Longitude. Risk variables such as geomorphology, shoreline change, slope, wave height, tidal range, and bathymetry are used to derive coastal vulnerability index. Based on the nature of the theme vulnerability value was assigned a for each data variable, the coastal vulnerability index was calculated as the square root of the product of the ranked variables divided by the total number of variables. Result of the analysis showed that vulnerability of the coast was segmented as highly vulnerable and less vulnerable. The coast between Kovalam to Mamallapuram was accreted on the northern region and few areas of southern parts of the study. The shoreline change value used here, with positive numbers indicating accretion and negative numbers indicating erosion. Shore...
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Papers by Dr Nethajimariappan Velu Ethirajan