Investigating the conversion coefficients for free water surface evaporation of different evaporation pans
Fu, G., Liu, C., Chen, S. and Hong, J.
2004 HYDROLOGICAL PROCESSES, Hydrol. Process. 18, 2247-2262 (2004)
Nansihu Lake Experimental Station; free water surface evaporation; conversion coefficients; evaporators
Fu, G., Liu, C., Chen, S. and Hong, J., (2004), "Investigating the conversion coefficients for free water surface evaporation of different evaporation pans", HYDROLOGICAL PROCESSES, Hydrol. Process. 18, 2247-2262 (2004).
Abstract:
The conversion coefficients of free water surface evaporation were investigated. Comparisons were made between numerous evaporation tanks (pans) and a 20 m2 evaporation tank. Based on 6 years of evaporation data collected at Nansihu Lake Evaporation Station in Shandong Province, China, the following results have been obtained. First, conversion coefficients varied according to the evaporator type. The average yearly conversion coefficient was only 0D60 for 20 evaporator (an evaporation pan with a diameter of 20 cm), whereas it was about 1D07 for the E601's pan, whose rim was about 7D5 cm above ground. Second, the conversion coefficient changes within a year had the same pattern among the evaporators evaluated. The monthly conversion coefficients had the minimum values in March
or April, then increased with time, and reached their maximum values in August or September. After September, the conversion coefficients varied in different directions with time. Third, the conversion coefficients changed from year to year, but their variations between maximum and minimum values were between 0D06 and 0D16. Fourth, the installation modes, structures, and composition of the evaporators affected the evaporation amount. Fifth, the conversion coefficients at Nansihu and Yucheng stations for the same evaporator did not show a distinct difference. The E601 evaporator has almost the same conversion coefficients at six of seven stations spanning almost 20กใ in latitude from northern to southern China. Sixth, the yearly evaporation from a 100 m2 evaporation tank was almost the same as that
from the 20 m2 evaporation tanks; however, the differences still existed in any given month.
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