Runoff characteristics of a small watershed of a Japanese cedar plantation during three cold seasons, including a rare warmer and less snowy year

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  • 希有な温暖少雪年を含む3寒候期のスギ人工林小流域からの流出特性

Abstract

<p>In order to contribute to climate change adaptation, we conducted hydrological observations and examined runoff characteristics with meteorological conditions during the cold season (November to May) from 2020 to 2022 at the Nagasaka Experimental Watershed (NEW) covered by Japanese cedar plantation in Akita Prefecture. According to observations by AMeDAS Takanosu in the past 43 years near the NEW, the midwinter (January to February) of 2020 was the second warmest and the snow depth in early March of 2020 was the lowest on the record, making it a rare warmer and less snowy year. The daily runoff in the midwinter dispersed among plentiful, ordinary, low, and scanty runoffs in the discharge duration curve, and the slope of the curve was gentler than other years. In the midwinter of 2022, the average temperature was lower, and the daily runoff during the midwinter was relatively constant and concentrated on low runoff, resulting in an increase in snowmelt water in spring (March to April). In the warmer with less snowy year, it was suggested that the risk of disasters due to flooding was low and that the risk of drought was high in early spring for years with the less amount of precipitation. Observation data in this study would contribute to evaluate the impact of climate change on runoff characteristics and to establish suitable adaptation plans.</p>

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