A Diurnal Distribution Function for Daily Evaporation

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Abstract
Some deterministic mathematical models of hydrologic processes require an approximate diurnal distribution of evaporation. The problem of estimating the diurnal distribution of evaporation rates is examined when only total daily evaporation is given. Two cases are considered, clear days and cloudy days, and nondimensional distribution functions are developed for each case. Application of the distribution functions requires a knowledge of the time of sunrise and daylength. Operating rules to decide which distribution function to employ are given in terms of alternate data, sunshine hours, solar radiation, and daily evaporation. The preliminary nature of the results is emphasized.

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