ESTIMATION OF EVAPOTRANSPIRATION AND LAND-SURFACE TEMPERATURE FOR EACH LAND USE TYPE IN THE UPPER KANDA RIVER WATERSHED

Abstract

 In this study, an evapotranspiration model that can express the amount of evapotranspiration accounting for differences in soil moisture and permeation characteristics of individual land-surface features is proposed. The model is composed of two components; the pervious area model based on SMPT model to represent the permeation process of the surface soil, and the impervious area model considering depression storage in impervious areas. Furthermore, the pervious area model takes into account the state of the soil moisture and differences in land use of the land-surface features, and estimates the latent and sensible heat using a heat balance equation based on the bulk formula. The model was applied to the highly urbanized upper Kanda River watershed, and the impacts of differences in land use on the spatial distribution of evapotranspiration and land-surface temperature was analyzed.