K. M. Somayaji's research while affiliated with Indira Gandhi Centre for Atomic Research and other places

Publications (10)

Article
Continuous dose rate recorded by the network of environmental monitoring stations at Kalpakkam is analysed for estimating the site dose profile with respect to the local climatology. The gamma dose rate recorded comprises of the natural background as well as the dose due to the designed release of Ar-41 gaseous activity from Madras Atomic Power Sta...
Article
A portable energy-specific fluence monitor is developed for field monitoring as well as to serve as stand-alone data acquisition system to measure dose rate due to routine releases at various locations in and around Nuclear Power Reactors. The data from an array of such monitors deployed over a region of interest would help in evolving a methodolog...
Article
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Radiological impact due to hypothetical air-borne effluent releases for an upcoming fast reactor (PFBR), at a tropical coastal site in Kalpakkam is studied using the HYSPLIT dispersion model. Short range air dispersion simulations are conducted with HYSPLIT for a weakly forced synoptic condition on 3rd March, 2008 with three turbulent diffusion met...
Article
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Detailed measurements were carried out in the Marine Atmospheric Boundary Layer (MABL) during the Integrated Campaign for Aerosols, gases and Radiation Budget (ICARB) which covered both Arabian Sea and Bay of Bengal during March to May 2006. In this paper, we present the meteorological observations made during this campaign. The latitudinal variati...
Article
This paper describes the implementation of meteorological measurement facility by installing 50 m tall towers at Kalpakkam for atmospheric dispersion studies. Though nothing novel could apparently be attributed to the idea of writing an article on the tower, the cost-effective structural design, portability-recoverability, in-house design of the si...
Article
Full-text available
We report the spatio-temporal variability of surface-layer turbulent fluxes of heat, moisture and momentum over the Bay of Bengal (BoB) and the Arabian Sea (AS) during the Integrated Campaign for Aerosols, gases Radiation Budget (ICARB) field experiment. The meteorological component of ICARB conducted during March-May 2006 onboard the oceanic resea...
Article
Full-text available
A simulation study of the sea breeze circulation and thermal internal boundary layer (TIBL) characteristics has been carried out at the tropical site Kalpakkam on the east coast of India, for operational atmospheric dispersion prediction. The community based PSU/NCAR MM5 Meso-scale meteorological model is used for the study. Three cases on typical...
Article
Full-text available
ABSTRACT. A phased array Doppler Mini-Sodar has been installed at Anupuram near Kalpakkam nuclear site during the Coastal Atmospheric Boundary Layer Experiments (CABLE) carried out on the east coast of India. Mini-Sodar was used to measure the wind profile and investigate the coastal boundary layer development due to land-sea breeze circulation for...
Article
The conventional gamma camera used for the assessment of lymphatic system, using the lymphoscintigraphy technique, is institution based and costly. Therefore, it is not easily accessible to people from remote rural areas. Hence, there is a need for economical and portable equipment to field survey disease‐prone areas. Towards this objective, with t...
Article
Ground level concentration and sky-shine dose due to radioactive emissions from a nuclear power plant at a coastal site have been estimated using the standard Gaussian Plume Model (GPM) and the modified GPM suggested by Misra (Atmospheric Environment 14 (1980) 397), which incorporates fumigation effect under sea breeze condition. The difference in...

Citations

... There are minute differences in wind field over the oceanic region in all the modified cases. The time series of the surface wind, air temperature, wind speed and wind direction are compared with Automated Weather Station (AWS) observations from about 13 surface stations (Manikiam et al 2008) and observations from a meteorological tower at Kalpakkam (Somayaji et al 2008) in the fine grid domain. Wind data from AWS stations is available at 4m above ground level (AGL) while the data from the micrometeorological tower is at 10 m. ...
... Among all these scenarios, the release of aerosols from the RCB is considered to be significant, resulting in exposures to the public in the emergency planning zone. The radiological impact analysis of a nuclear reactor in case of hypothetical severe accidental conditions is based on the estimation of the quantity of radioactive substances released to the environment [12,13]. To estimate the radioactive substances released to the environment, quantitative understanding of various aerosol processes and prediction of the temporal evolution of concentration of radioactive aerosols suspended in the containment is of vital importance and is required for assessment of radiological consequences. ...
... The development of sea breeze during the warm season in different coastal parts of India is known to affect the local weather (Suresh and Bhatnagar 2005) and has been shown to play an important role in air pollution dispersion (Srikanth et al. 2016b(Srikanth et al. , 2018. Previous studies over southern peninsular India also show that sea breeze is the predominant mesoscale circulation affecting the regional weather and is the chief source of moisture for the convective thunderstorms over this region (Suresh and Bhatnagar 2005;Srinivas et al. 2006;Simpson et al. 2007Simpson et al. , 2008Rani et al. 2010;Chen et al. 2014;Poljak et al. 2014;Bhate et al. 2016). Sea breeze influences the local winds and rainfall during summer and southwest monsoon (Suresh and Bhatnagar 2005;Simpson et al. 2007Simpson et al. , 2008. ...
... • the weather is rapidly changing or is strongly affected by local effects, i.e. urban or coastal circulation, convective clouds and frontal systems, (Venkatesan et al., 2002). ...
... The relative humidity (RH %) varied from 49.1 to 79.8% with a mean value of 64.2%. Detailed descriptions of meteorological conditions, aerosol sampling and analysis of chemical constituents during SK-223A and SK-254 are given elsewhere (Alappattu et al., 2008;Kumar et al., 2008Kumar et al., , 2010Srinivas et al., 2011;Subrahamanyam et al., 2011). ...
... The environmental monitors placed around a nuclear installation employ radionuclide release information to measure dose rates [7]. The calculation of dose rate is dependent on the plume shape and the distribution of radionuclide concentration. ...
... Many studies focused on the marine ABL dynamics at the stations located along the coastal India (Rani et al. 2010, Nair et al. 2011) and on Arabian sea and Bay of Bengal Subramanyam et al. 2003;Alappattu et al. 2008). Recently, studied moisture variability over three locations in southern India using Radiosonde data and found that the moisture above the BL plays a significant role in maintaining the precipitation conditions over Indian region. ...