A prediction model for the seasonal variation of evaporation from non-vegetated ground surfaces: (2)Experimental verification

Abstract

Experimental verification of the soil model as reported in the previous paper was made by long-time observations of evaporation, ground surface temperature and soil water content. The first observation of evaporation from a sand was performed using a lysimeter with a diameter of 0.46 m, for a period of 416 days at Sendai. Total amount of observed evaporation is 583 mm and that of calculated one is 616 mm. The difference between the calculated and observed result is ±0.3 mm d-1 for a five-days mean evaporation, and that is ±1°C for a daily mean ground surface temperature. The second observation was carried out at a field of bare soil ground consisting of a fine sand called Narita sand, for a period of 23 days at Chiba. The soil model well simulates the observed evapotation and ground surface temperature. Total amount of observed evaporation is 45 mm, and that of calculated one is 51 mm.