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 Table of Contents 
ARTICLE
Year : 2011  |  Volume : 34  |  Issue : 1  |  Page : 60-62  

Studies on the ground level wind distribution at Kaiga site using ultrasonic anemometer


1 ESL, K.G.S., Kaiga, Karwar, Karnataka, India
2 Health Physics Division, BARC, Mumbai, India

Date of Web Publication17-Mar-2012

Correspondence Address:
A G Hegde
Health Physics Division, BARC, Mumbai
India
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Source of Support: None, Conflict of Interest: None


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  Abstract 

This paper presents the results of estimation of ground level (10m) wind pattern at Kaiga site using ultra sonic anemometer for month of September. The study generated wind data at ground level for the month of September 2009. More than 70% of the wind is in a speed group less than 0.8m.s -1 , except during 12-18 h, and hence, cannot be measured by conventional anemometer or SODAR system. Present data clearly indicate that during September month, wind direction pattern observed at 10 m height at Kaiga site measured using Ultra sonic anemometer is comparable with that observed at higher sites using conventional wind monitoring system. This data will be extremely useful for understanding lower wind speed distribution which may not be possible to be measured with conventional wind measurement systems. This data will be extremely useful for understanding the pattern of environmental distribution of atmospherically released radionuclides especially, that of tritium, through forest canopy surrounding the site.

Keywords: Ultrasonic anemometer, ground-level wind distribution at Kaiga


How to cite this article:
Hegde M N, Vishnu M S, Ravi P M, Nayak P D, Hegde A G. Studies on the ground level wind distribution at Kaiga site using ultrasonic anemometer. Radiat Prot Environ 2011;34:60-2

How to cite this URL:
Hegde M N, Vishnu M S, Ravi P M, Nayak P D, Hegde A G. Studies on the ground level wind distribution at Kaiga site using ultrasonic anemometer. Radiat Prot Environ [serial online] 2011 [cited 2019 Aug 17];34:60-2. Available from: http://www.rpe.org.in/text.asp?2011/34/1/60/93957


  1. Introduction Top


Three Pressurized Heavy Water (PHWR) type nuclear reactors are operational at Kaiga site and one is in the advanced stage of commissioning. During normal operating conditions, the releases of radionuclides to the environment from these power plants are much below the limits prescribed by regulatory body. A meteorological laboratory under Health Physics Division, Bhabha Atomic Research Centre is operational at Kaiga which continuously monitors the meteorological parameters of the site for the environmental impact assessment. Kaiga site is located in the Western Ghat ranges and a major part of surrounding area is covered by reserved forest. The wind speed in Kaiga site is very low with calm conditions cases (wind speed less than 0.8 ms -1 ) as high as 60% at 16m (Adiga, et al, 1997). The atmospherically released radionuclides from the nuclear power plants undergo dilution and dispersion and reaches ground level at various distances from stack depending upon the stability category. The wind pattern in ground level is very important to understand the process of deposition, especially in forest canopies. Hegde et al has compared the wind pattern at two locations at Kaiga site and explained the results on the basis of terrain features (Hegde et al., 2005). A wind shear was also observed at Kaiga site during winter season (Adiga et al, 1997). In view of the limitations in sensitivity, it is not possible to measure wind speed at low level (<0.1ms -1 ) using conventional wind measuring systems such as cup anemometer or SODAR system. Hence it is also not possible to understand the directional pattern of wind in the ground levels. Ultrasonic anemometers are very sensitive and can measure wind speed as low as 0.01m.s -1 , in addition to turbulence parameters. This paper presents the results of estimation of ground level (10m) wind pattern at Kaiga site using ultra sonic anemometer for a typical month.


  2. Materials and Methods Top


An Ultrasonic anemometer model No.USA1 procured from METEK, Germany was installed at 10 m height of a met- Tower at Kaiga site. Parameters of the system were set as suggested in the operating manual. Wind speed and wind direction along with other parameters were recorded for an averaging period of 30 min in a memory card which was retrieved for analysis on regular basis. Wind rose was obtained using the demonstration software downloaded from WRPLOT VIEW, Lakes International.


  3. Results and Discussion Top


[Table 1] shows a comparison of wind speed at various time of the day during the month of September 2009. It can be seen that, more than 70% of the wind is in a speed group less than 0.8m.s -1 , except during 12-18 hrs, and hence cannot be measured by conventional anemometer or SODAR system. The general increasing trend in wind speed during evening time may be presumably due to the influence of sea breeze. Similar trend was observed for wind pattern at higher heights at Kaiga (Adiga et al, 1997).
Table 1: Comparison of wind speed at various time of the day at Kaiga site during the month of September 2009

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[Figure 1]a-d shows the diurnal variation of wind pattern at 10 m observed using ultra sonic anemometer. It can be seen that predominant wind direction during 0 to 6 hrs, 6 to 12 hrs, 12 to 18 hrs and 18 to 24h at Kaiga site are W, WSW, WSW and W respectively. Similar trend was observed at 20 m height in the same location (Adiga, et al. 1997).
Figure 1: a-d: Diurnal variation in wind pattern observed at Kaiga at 10 m height from ground level

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[Figure 2] shows the monthly wind rose obtained at Kaiga site at 10m from ground level using ultra sonic anemometer. It can be seen that predominant wind direction during the month of September at 10m height from ground is W and WSW. Similar trend was observed at 40m tower and 100 m SODAR system in the same location [Table 2].
Figure 2: Wind pattern observed at Kaiga at 10 m height from ground level during September-2009

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Table 2: Predominant wind pattern observed at Kaiga during September 2009 at 40 m and 100 m height

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Above data clearly indicate that during month of September, wind pattern observed at 10 m height at Kaiga site measured using ultra sonic anemometer is comparable with that observed at higher heights using conventional wind monitoring system. Data collection and analysis are in progress to measure the wind pattern at 10 m height during other parts of the years also. This data will be extremely useful for understanding the pattern of environmental distribution of atmospherically released radionuclides at ground levels, especially that of tritium, through forest canopy surrounding the site.


  4. Conclusions Top


This paper presents the results of estimation of ground level (10m from ground) wind pattern at Kaiga site using ultra sonic anemometer for month of September-2009. The study generated wind data at ground level for the month of September 2009. More than 70% of the wind is in a speed group less than 0.8m.s -1 , except during 12-18 h, and hence cannot be measured by conventional anemometer or SODAR system. Above data clearly indicate that during September month, wind pattern observed at 10 m height at Kaiga site measured using Ultra sonic anemometer is comparable with that observed at higher heights using conventional wind monitoring system This data will be extremely useful for understanding the pattern of environmental distribution of atmospherically released radionuclides at ground level, through forest canopy surrounding the site.


  5. Acknowledgements Top


The authors would like to thank Shri. H S Khushwaha, Director, Health, Safety and Environment Group, BARC and Dr. P.K. Sarkar, Head, Health Physics Division, BARC for their valuable guidance and keen interest in this work. Also authors would like to thank Shri V.V. Sanathkumar, Site Director, Kaiga 1-4, Shri J P Gupta, Station Director KGS 1&2 and other site officials for their continuous support. The authors also would like to thank Shri S.M. Gaonkar and Shri A.M. Kudtharkar, ESL, KGS for their technical support.


  6. References Top


  1. Adiga B.B, Nayak P.D, Hegde M.N. and Sundaram M. (1997), Meteorological Summary Report for Kaiga project site for the period from October 1993 to September 1996, BARC Report, BARC/1997/I/003.
  2. Hegde M. N., Ravi P.M., Nayak P.D, and Hegde A.G. (2005), Comparison of Wind Profile At Two Locations At Kaiga Site Comparison of Wind Profile At two Locations At Kaiga Site, Proceedings of IARP Conference, Mumbai.



    Figures

  [Figure 1], [Figure 2]
 
 
    Tables

  [Table 1], [Table 2]



 

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  In this article
Abstract
1. Introduction
2. Materials and...
3. Results and D...
4. Conclusions
5. Acknowledgements
6. References
Article Figures
Article Tables

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