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Delineation of groundwater potential zones in Theni district,Tamil nadu,using remote sensing,GIS and MIF techniques

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Geoscience Frontiers 2012年第2期3卷 189-196页

作者： n.S.Magesh n.chandrasekar John Prince Soundranayagam Centre for Geotechnology Manonmaniam Sundaranar University

Integration of remote sensing data and the geographical information system （GIS） for the exploration of groundwater resources has become a breakthrough in the field of groundwater research, which assists in assessing, monitoring, and conserving groundwater resources. In the present paper, various groundwater potential zones for the assessment of groundwater availability in Theni district have been delineated using remote sensing and GIS techniques. Survey of India toposheets and IRS-IC satel- lite imageries are used to prepare various thematic layers viz. lithology, slope, land-use, lineament, drainage, soil, and rainfall were transformed to raster data using feature to raster converter tool in ArcGIS. The raster maps of these factors are allocated a fixed score and weight computed from multi influencing factor （MIF） technique. Moreover, each weighted thematic layer is statistically computed to get the groundwater potential zones. The groundwater potential zones thus obtained were divided into four categories, viz., very poor, poor, good, and very good zones. The result depicts the groundwater potential zones in the study area and found to be helpful in better planning and management of ground- water resonrces.

关键词： Groundwater potential zones India Remote sensing Geographic information system MIF technique

A robust behavior of Feed Forward Back propagation algorithm of Artificial neural networks in the application of vertical electrical sounding data inversion

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Geoscience Frontiers 2012年第5期3卷 729-736页

作者： Y.Srinivas A.Stanley Raj D.Hudson Oliver D.Muthuraj n.chandrasekar Centre for Geotechnology Manonmaniam Sundaranar UniversityTirunelveliTamil Nadu-627012India M.D.T.Hindu college TirunelveliTamil NaduIndia

The applications of intelligent techniques have increased exponentially in recent days to study most of the non-linear parameters. In particular, the behavior of earth resembles the non- linearity applications. An efficient tool is needed for the interpretation of geophysical parameters to study the subsurface of the earth. Artificial neural networks （Ann） perform certain tasks if the structure of the network is modified accordingly for the purpose it has been used. The three most robust networks were taken and comparatively analyzed for their performance to choose the appropriate network. The single- layer feed-forward neural network with the back propagation algorithm is chosen as one of the well- suited networks after comparing the results. Initially, certain synthetic data sets of all three-layer curves have been taken tk^r training the network, and the network is validated by the field datasets collected from Tuticorin Coastal Region （78°7＇30＂E and 8°48＇45＂n）, Tamil nadu, India. The interpretation has been done successfully using the corresponding learning algorithm in the present study. With proper training of back propagation networks, it tends to give the resistivity and thickness of the subsurface layer model of the field resistivity data concerning the synthetic data trained earlier in the appropriate network. The network is trained with more Vertical Electrical Sounding （VES） data, and this trained network is demon- strated by the field data. Groundwater table depth also has been modeled.

关键词： Artificial neural networks(Ann) Resistivity inversion coastal aquifer parameters Layer model

Correlation Between Coastal Geomorphology and Tsunami Inundation Along the Coast of Kanyakumari,India

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Journal of Ocean University of China 2012年第1期11卷 1-6页

作者： n.chandrasekar S.Saravanan M.Rajamanickam C.Hentry G.V.Rajamanickam Centre for GeoTechnology Manonmaniam Sundaranar UniversityTirunelveliIndia Department of Disaster Management SASTRA UniversityThanjavurIndia

An investigation has been carried out in the vicinity of the coastal villages of Kanyakumari District,India to decode the influence of coastal geomorphology on inundation degree and run-up *** though the tsunami waves approach the study area in different patterns,the consequences are found to be mainly dependent upon the coastal configuration and local geographic setting,the study area are considered to be of three types based upon the geomorphic arrangement,namely shallow coast,elevated coast and estuarine *** inundation and run-up level vary from coast to coast even though there is no remarkable variation in the intensity of the approaching tsunami *** inundation extent ranges from to 54 m to 413 m with maximum along estuarine coast and minimum along elevated *** coast recorded the maximum run-up level of about 6 m and the minimum of about 1 m along the elevated *** percentage of inundated area in the total coastal area varies between 19% to 10% along estuarine coast and elevated coast *** and run-up level cannot be appreciable in the inland along the elevated *** beaches of elevated coast are less affected whereas those of estuarine coast are highly *** is limited in the elevated beaches along the study area.

关键词： tsunami India coast geomorphology inundation

印度塔米尔那杜地区堪雅库玛里与奥瓦利之间海岸区域海啸灾后评估——事例分析(英文)

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地学前缘 2009年第6期16卷 129-137页

作者： S.Saravanan n.chandrasekar C.Hentry M.Rajamanickam J.Loveson Immanuel P.Siva Subramanian Centre for Geo-Technology Manonmaniam Sundaranar University Marine Geochemistry Research Lab Spic Research CentreV.O.C.College Department of Physics St.Jude's College

海岸带是动态地区,由于众多因素,包括海平面的上升、波浪与洋流的类型、飓风乃至人类的影响,海岸地区经常受到变动。2004年12月26日巨大海啸席卷了堪雅库玛里至奥瓦利之间的海岸。当海浪冲上海滩时波高达30英尺。许多人因为巨浪的冲击... 详细信息

海岸带是动态地区,由于众多因素,包括海平面的上升、波浪与洋流的类型、飓风乃至人类的影响,海岸地区经常受到变动。2004年12月26日巨大海啸席卷了堪雅库玛里至奥瓦利之间的海岸。当海浪冲上海滩时波高达30英尺。许多人因为巨浪的冲击和退浪的强力推拉而淹死在海里,许多村庄被毁。死亡总数超过300人,而且财产损失严重。海啸的规模与洋底移动的面积、移动距离是有关系的。该区显示为海成阶地、沙丘、滩脊、河口、洪积平原、海滩、红树林、准平原、高地、海蚀崖等等。我们试图通过现场在线勘查、政府记录以及采用遥感技术所做的海岸地貌研究等资料,通过海滩剖面测量和海岸环境的变化,进行海岸线动力学研究。文中也对主要的破坏予以认定。

关键词：海啸波浪生态冲击

Quality assessment and hydrogeochemical characteristics of groundwater in Agastheeswaram taluk, Kanyakumari district, Tamil nadu, India

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Chinese Journal Of Geochemistry 2014年第3期33卷 221-235页

作者： Srinivas Y Hudson Oliver D Stanley Raj A chandrasekar n Centre for GeoTechnology Manonmaniam Sundaranar University Vel Tech Dr. RR & Dr. SR Technical University Avadi Chennai

The present study investigates the hydrogeochemical characteristics of groundwater quality in Agastheeswaram taluk of Kanyakumari district, Tamil nadu, India. A total of 69 groundwater samples were collected during pre- and post-monsoon periods of 2011–2012. The groundwater quality assessment has been carried out by evaluating the physicochemical parameters such as pH, EC, TDS, HCO3-, Cl-, SO42-, Ca2+, Mg2+, na+ and K+ for both the seasons. Based on these parameters, groundwater has been assessed in favor of its suitability for drinking and irrigation purpose. Dominant cations for both the seasons are in the order of na+ > Ca2+ > Mg2+ > K+ while the dominant anions for post monsoon and pre monsoon have the trends of Cl- > HCO3- > SO42- and HCO3- > Cl- > SO42-, respectively. Analytical results observed from various indices reveal that the groundwater quality is fairly good in some places. Analytical results of few samples show that they are severely polluted and incidentally found to be near the coasts, estuaries and salt pans in the study area. The Gibbs plot indicates that the majority of groundwater samples fall in rock dominant region, which indicates rock water interaction in the study area. The United States salinity(USSL) diagram shows that the groundwater is free from sodium hazards but the salinity hazard varies from low to very high throughout the study area. This reveals that the groundwater is moderately suitable for agricultural activities. The observed chemical variations in pre-monsoon and post-monsoon seasons may be the effect to rock-water interactions, ion-exchange reactions, and runoff of fertilizers from the surrounding agricultural lands.

关键词：地下水质量评价地下水水质水文特性马里印度水岩相互作用物理化学参数研究区域

Measurement-induced nonlocality based on affinity

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Communications in Theoretical Physics 2020年第7期72卷 42-48页

作者： R Muthuganesan V K chandrasekar Centre for nonlinear Science&Engineering School of Electrical&Electronics EngineeringSASTRA Deemed UniversityThanjavur—613401Tamil NaduIndia

Measurement-induced nonlocality(MIn),a quantum correlation measure for bipartite systems,is an indicator of maximal global effects due to locally invariant von neumann projective *** is originally defined as the maximal square of the Hilbert-Schmidt norm of the difference between pre-and post-measurement *** this article,we propose a new form of MIn based on *** quantity satisfies all the criteria of a bona fide measure of quantum correlation *** quantity is evaluated for both arbitrary pure and 2×n dimensional(qubit-qudit)mixed *** operational meaning of the proposed quantity is interpreted in terms of the interferometric power of the quantum *** apply these results on two-qubit mixed states,such as the Werner,isotropic and Bell diagonal states.

关键词： affinity nonlocality quantum correlation local measurements

Analytic Study of Magnetohydrodynamic Flow and Boundary Layer Control Over a Wedge

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Acta Mathematicae Applicatae Sinica 2008年第4期24卷 541-552页

作者： M.chandrasekar S.Baskaran Department of Mathematics Anna UniversityChennai-600 025India Department of Mathematics S.S.N.College of EngineeringKalavakkamChennai-603 110India

A genuine variational principle developed by Gyarmati, in the field of thermodynamics of irreversible processes unifying the theoretical requirements of technical, environmental and biological sciences is employed to study the effects of uniform suction and injection on MHD flow adjacent to an isothermal wedge with pressure gradient in the presence of a transverse magnetic field. The velocity distribution inside the boundary layer has been considered as a simple polynomial function and the variational principle is formulated. The Euler-Lagrange equation is reduced to a simple polynomial equation in terms of momentum boundary layer thickness. The velocity profiles, displacement thickness and the coefficient of skin friction are calculated for various values of wedge angle parameter m, magnetic parameter ξ and suction/injection parameter H. The present results are compared with known available results and the comparison is found to be satisfactory. The present study establishes high accuracy of results obtained by this variational technique.

关键词： Magnetohydrodynamics suction/injection skin friction Gyarmati's variational principle wedge parameter

Spatial and temporal correlation between beach and wave processes： implications for bar-berm sediment transition

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Frontiers of Earth Science 2018年第2期12卷 349-360页

作者： V. JOEVIVEK n. chandrasekar S. SARAVAnAn H. AnAnDAKUMAR K. THAnUSHKODI n. SUGUnA J. JAYA Centre for GeoTechnology Manonmaniam Sundaranar University Abishekapatti Tirunelveli 627012 Tamil Nadu India Akshaya college of Engineering and Technology Kinathukadavu Coimbatore 642109 Tamil Nadu India

Investigation of a beach and its wave condi-tions is highly requisite for understanding the physicalprocesses in a coast. This study composes spatial andtemporal correlation between beach and nearshore pro-cesses along the extensive sandy beach of nagapattinamcoast, southeast peninsular India. The data collectionincludes beach profile, wave data, and intertidal sedimentsamples for 2 years from January 2011 to January *** field data revealed significant variability in beach andwave morphology during the northeast （nE） and southwest（SW） monsoon. However, the beach has been stabilized bythe reworking of sediment distribution during the calmperiod. The changes in grain sorting and longshoresediment transport serve as a clear evidence of thesediment migration that persevered between foreshoreand nearshore regions. The Empirical Orthogonal Function（EOF） analysis and Canonical Correlation Analysis （CCA）were utilized to investigate the spatial and temporallinkages between beach and nearshore criterions. Theoutcome of the multivariate analysis unveiled that theseasonal variations in the wave climate tends to influencethe bar - berm sediment transition that is discerned in thecoast.

关键词： beach nearshore sandbar grain size empiri-cal orthogonal function canonical correlation analysis

Experimental studies on the erosion rate of different heat treated carbon steel economiser tubes of power boilers by fly ash particles

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International Journal of Minerals,Metallurgy and Materials 2009年第5期16卷 534-539页

作者： T.A.Daniel Sagayaraj S.Suresh M.chandrasekar Department of Mechanical Engineering National Institute of Technology Tiruchirappalli-620015Tamil NaduIndia

The experimental investigations on the effect of the fly ash particle size, velocity, impingement angle, and feed rate were done with an emphasis on the effect of erosion on annealed SA 210 GrA1 （A） and normalized SA 210 GrA1 （n） carbon steel economizer-tube materials. Erosion rates were evaluated with different impingement angles ranging from 15° to 90°, at four different velocities of 32.5, 35, 37.5, and 40 m/s, and at four different feed rates of fly ash particles of 2, 4, 6 and 8 g/min. The erodent used was fly ash particles, sizes ranging from 50-250 μm of irregular shapes. Erosion rate is found to be the maximum at the impingement angle of 30°. Erosion rates of the carbon steel tube in different heat treatment conditions, annealed and normalized, at a constant velocity of 32.5 m/s with different angles were studied. In all cases of feed rates, impingement angles, particle sizes, and velocities of fly ash particles, it has been found that the erosion rate of the annealed tube is less than that of the normalized tube. Empirical correlations for erosion rate relating the velocity, size, feed rate, and impingement angle of the particles and elongation property of the target materials were arrived. Morphologies of the eroded surface were examined by scanning electron microscope （SEM）.

关键词： erosion rate economiser tubes annealing normalizing