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

Y. Srinivas  Oliver D. Hudson  Raj A. Stanley  N. Chandrasekar 《中国地球化学学报》2014,33(3):221-235

The present study investigates the hydrogeochemical characteristics of groundwater quality in Agas- theeswaram 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 CI 〉 HCO3 〉 SO42- and HCO3- 〉 CI 〉 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.  相似文献   

One-dimensional dispersion in unsteady flow in an adsorbing porous medium: An analytical solution     

Raja Ram Yadava  Ram Raj Vinda  Naveen Kumar 《水文研究》1990,4(2):189-196

Analytical solutions describing the concentration distribution along one-dimensional unsteady seepage flow through adsorbing saturated finite porous medium have been obtained. An exponential function concentration is enforced at the source of the dispersion, while the change in the concentration is zero at the other boundary. A new time variable has been introduced to solve the unsteady flow problem and the solution is illustrated.  相似文献   

Bianchi Type I Bulk Viscous Stiff Fluid Tilted Cosmological Model in General Relativity     

Raj Bali  Keshav Sharma 《Astrophysics and Space Science》2001,275(4):485-497

Bianchi Type I Bulk viscous fluid tilted cosmological model without shearviscosity is investigated. The behaviour of the model in presence andabsence of bulk viscosity is discussed. The physical and geometricalconsequences of the models are also discussed.  相似文献   

Tilted Cosmological Models Filled with Disordered Radiation in General Relativity     

Raj Bali  B.L. Meena 《Astrophysics and Space Science》2002,281(3):565-575

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Laboratory experiments on the influence of soil pipes on slope failure     

Raj H. Sharma 《Landslides》2015,12(2):345-353

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Performance of flexible retaining walls supporting dry cohesionless soils under cyclic loads     

Raj Siddharthan  Emmanuel M. Maragakis 《国际地质力学数值与分析法杂志》1989,13(3):309-326

A finite element model is proposed for studying the seismic response of a flexible retaining wall/soil system. The model accounts for nonlinear hysteretic soil behaviour, and also for the increase in lateral stresses and settlement related to grain slip caused by cyclic loads. The response computed by the proposed method was compared with responses recorded at the Cambridge centrifuge facility, and found to be in reasonable agreement. The model was then used to identify the importance of factors such as flexibility of the wall and relative density of the backfill. The study reveals that the maximum bending moments given by current design procedures are nonconservative for stiffer walls. Deflections of flexible walls are of major concern. Flexible walls supporting a sand of medium density yield the greatest deflection.  相似文献   

A gravitationally non-degenerate cosmological model with expanding and shearing viscous fluid in general relativity     

Raj Bali  Deepak Raj Jain 《Astrophysics and Space Science》1987,139(1):175-181

The object of this paper is to investigate the behaviour of viscosity in a cosmological model, in which the coefficient of shear viscosity is assumed to be proportional to rate of expansion in the model. The behaviour of the model in the absence of shear viscosity is also discussed.  相似文献   

Collisional excitation of interstellar molecule due to H2     

Suresh C. Mehrotra 《Astrophysics and Space Science》1981,78(2):463-465

Collision induced vibrational rates of SiO due to H₂ are computed using the normalized perturbative, semiclassical approach as described in Paper I (Mehrotra, 1980). The rates are very small as compared to the rates for rotational excitation and are more sensitive to temperature.  相似文献   

Unsteady flow of a non-Newtonian visco-elastic fluid between two coaxial circular cylinders     

Krishna Raj Choubey 《Astrophysics and Space Science》1984,105(2):301-305

In this paper, the flow of a visco-elastic liquid between two coaxial circular cylinders has been studied when inner cylinder is moving from rest for a certain period with linearly growing speed and then stops suddenly. The Laplace transform technique has been employed to solve the basic differential equations. The expression for the velocity field is obtained.  相似文献   

Magneto-viscous fluid cosmological model of plane symmetry in general relativity     

Raj Bali 《Astrophysics and Space Science》1984,107(1):155-165

The object of this paper is to investigate the behaviour of magnetic field in a viscous fluid cosmological model. Various physical and geometrical properties of the model have also been discussed.  相似文献