Heat energy exchange over a large water body under stable atmospheric conditions |
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| Authors: | Y Sadhuram P Vethamony A Suryanarayana G N Swamy J S Sastry |
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| Institution: | (1) National Institute of Oceanography, 403004 Dona-Paula, Goa, India |
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| Abstract: | The surface heat budget over the Riband reservoir covering 300 km2 is investigated making use of hydrometeorological data collected at a number of stations during May and June 1983. The observations had to be restricted to 0800–1400 hr for operational reasons in this remote part of India. The winds were weaker, and in general the temperature and humidity gradients were stronger at that time of day than during the afternoon.The mean albedo between 0700–1200 hr is found to be about 34% which could be due to the high turbidity of the water. A simple relation of the form, R = (1 –  )Q
i
– 85 is proposed to estimate net radiation over the water body from the global radiation. This relation is useful for the computation of net radiation since it avoids the computation of effective back radiation, which requires data on humidity, cloud amount and surface water temperature. The overall means of net radiation, latent and sensible heat fluxes were found to be 420, 96 and -11 W/m2, respectively. A net heat gain of about 335 W/m2 was observed during the study period. The measured effective back radiation agreed reasonably well with the value computed from the theoretical formula. |
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