[A-HW27] 流域の水及び物質の輸送と循環－源流域から沿岸域まで－

[AHW27-P04] 積雪流域における長期の河川水温変動に基づく気候変動効果の推定

*丸山 豊¹、小野寺 真一¹、北岡 豪一²、齋藤 光代³、清水 裕太⁴ (1.広島大学大学院総合科学研究科、2.岡山理科大学、3.岡山大学大学院環境生命科学研究科、4.(独)農業・食品産業技術総合研究機構・近畿中国四国農業研究センター)

According to the effect of climate change such as global warming, it is possibly predicted that seasonal precipitation, snowfall, and river ecosystem changes in a watershed scale. Therefore, the estimation of climate change effect on river environment especially in a snow-covered watershed is important. In the present study, two different trends were found in the river temperature in western Japan; monthly decreasing trends and annual increasing trends. These trends could be explained by the hydrological process such as increase of snowfall and rainfall in the headwater area during winter seasons and increasing of the groundwater discharge to the river in summer seasons, respectively. An estimation of the temperature of river water by an extrapolation model in 2011-2050 indicates that annual temperature will increase.