STUDY ON AVERAGING THE DISTRIBUTED HYDROLOGICAL CONDITIONS FOR ESTIMATION OF REGIONAL EVAPOTRANSPIRATION

Abstract

Regional evapotranspiration in the East-Japan is estimated by using NOAA/AVHRR data and GPV (Grid Point Values of meteorological conditions) data based on the heat balance method. Spatial resolutions of those data are different each other.
In or order to get the estimated value of evapotranspiration, following two ways of data arrangement are examined and the results computed from the both ways are compared. At first in the paper, GPV data is interpolated to the scale of NOAA/AVHRR data. In the next, NOAA/AVHRR data is averaged to the scale of GPV data. At last, the authors make discussions on the scale averaging the hydrological conditions for getting more reasonable estimation of regional evapotranspiration.