Abstract
The purpose of this study is to propose a method to measure sensible heat flux from rough ground surface by using mirrors with scintillation method in order to actualize for setting scintillometers in free place of urban areas. We focused on that the values of sensible heat flux measured even at the different height in constant flux layer could be assumed to be equal. So we proposed an algorithm for estimation of sensible heat flux from measured values by multi-altitudes measurement using scintillometers. To measure by switching laser beam altitudes, we designed a system for multi-altitude measurement for switching altitudes, with combination of mirrors for reflection of laser beams. Measurement was performed on a flat field, and influence of crosstalk did not appear with the measurement result of sensible heat flux except at some particular incident angles. Then to evaluate our system and algorithm, a measurement was performed for two altitudes of one meter and two meters from ground surface on the paddy field. The measured values of sensible heat flux by gradient method and scintillation method almost agreed, therefore our system and algorithm was effective for estimation of sensible heat flux from such rough ground surface.
