秋田県長坂試験地における気象特性

Hydrological observations were conducted in the Nagasaka Experimental Watershed (NEW) in Akita prefecture to evaluate the effect of thinning on runoff characteristics in snowy region.The purpose of this study is to clarify the meteorological characteristics of the NEW.Moreover, we examined the validity of interpolation to replace missing data by comparing observation results for the NEW and AMeDAS data in the neighborhood of the NEW.Annual precipitation for three years (2007)(2008)(2009) ranged from 1620.0 to 2175.0 mm (mean of 1905.7 mm) and maximum snow depth was less than 1 m.Precipitation event the period without snow cover (May to October) were greater in amount, higher intensity and shorter duration than those during the period of snow cover (January to April, November to December).Much precipitation in July and August was observed.There was no distinct diurnal variation in precipitation.From meteorological observation over a 31-month period (June 2007 -December 2009), it was found that solar radiation ranged from 0.3 to 29.4 MJ m -2 d -1 (mean±SD of 10.3±7.9MJ m -2 d -1 ).The daily mean air temperature, daily maximum air temperature, and daily minimum air temperature ranged from -7.2 to 29.4 ℃ (10.3±9.0 ℃ ), -4.5 to 35.4 ℃ (15.6±10.1 ℃ ), and -11.5 to 22.7 ℃ (6.1±8.7 ℃ ), respectively.The meteorological data of AMeDAS at Takanosu located near the NEW were suitable for interpolation to replace missing data of the meteorological observation and to estimate past meteorological characteristics of the NEW.Daily meteorological data for the NEW were obtained and are presented at the end of this report.

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