Water vapor condensation in nighttime taking into account the ground heat fluxes at the surface and the underside of a bridge

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  • Tsuchiya Akio
    Department of Environmental Studies, Faculty of Integrated Arts and Sciences, Hiroshima University

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  • 橋表裏の熱流量を考慮した夜間の水蒸気の凝結に関する研究

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Temperature, humidity, and radiation-related parameters were measured during seven periods from January to October 2003 around a bridge on the campus of Hiroshima University. Net radiation changed not only with the seasonal change of solar altitude but also with weather. On a daily level, ground heat flux on the surface of the bridge (Gs) was -65.1, while heat flux on the underside of the bridge (Gr) was -34.9, and after subtracting Gr from Gs, the net radiation was distributed to 41.6 for sensible heat flux, 45.5 for latent heat flux, and -12.9 for ground heat flux. The potential evaporation, which was estimated from latent heat flux and surface temperature of the bridge, showed negative values sometimes during fair-weather nights, suggesting that water vapor on the bridge was condensed or frozen. Contrarily, supposing that there is no atmosphere under the bridge (G=Gs), the nighttime potential evaporation did not become minus, and the daily total was 11% larger than the estimate based on G=Gs-Gr.<br>

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