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Year : 2016  |  Volume : 39  |  Issue : 1  |  Page : 44-47

Estimation of roughness length Z0 for Kalpakkam site

Health Physics Division, Bhabha Atomic Research Centre, Mumbai, Maharashtra, India

Correspondence Address:
T Jesan
Health Physics Division, Bhabha Atomic Research Centre, Mumbai - 400 085, Maharashtra
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0972-0464.185182

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The accurate knowledge of the surface topographic parameters, which represent terrain characteristics of a site, is required in atmospheric dispersion modeling. The rough surface retards the wind flow from a smooth surface, which results in sharp decrease in wind speed, change in vertical profile along with atmospheric stability. Dispersion models require extrapolation of wind speed URef at measured height ZRef to the wind speed UStack at stack height ZStack , based on power law wind profile. Wind speed profile can be evaluated using site specific surface scaling parameters roughness length Z0 and friction velocity U* . In this paper, sector dependent Z0 and U* for Kalpakkam site is evaluated for neutral category and the sector values of Z0 are explained according to the terrain features. The maximum and minimum Z0 was observed in SSE (0.84 m) and N (0.26 m) upwind sectors due to the presence of more number of residential buildings, sand dunes, and high traffic, in contrast to N sector where mostly agricultural farming lands are present. The site specific wind speed profile index P is calculated based on Z0 for different sectors leads to better estimation of annual dilution factor and gamma dose on the part of neutral category computation. The surface scaling parameter mean surface drag coefficient CD was estimated to be 0.16, which implies urban environment at Kalpakkam site.

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