[A-HW24] 流域圏生態系における物質輸送と循環：源流から沿岸海域まで

[AHW24-20] 茨城県の森林源流域におけるSWATを用いた浮遊土砂量のシミュレーション

*今村 直広¹、Wang Kunyang²、小野寺 真一²、清水 裕太³、小林 政広¹、清水 貴範¹、篠宮 佳樹¹、釣田 竜也⁴、山下 尚之¹ (1.森林総合研究所、2.広島大学、3.農業・食品産業技術総合研究機構、4.農林水産技術会議)

キーワード：浮遊土砂、SWAT、森林源流域

Forest managements have been increasing all over the Japan recent year. Therefore, predicting the impact of forest operations on sediment yield at forest head-watershed has been more important. However, model simulation research for sediment yields at head-watershed is very rare. This study estimated daily water discharge and Suspended Sediment (SS) yields in forested head-watershed (60 ha) at Ibaraki Prefecture from 2015 through 2018 by using SWAT. As a result, daily hydrographs and SS yields showed relatively high reproduction for observed values (Nash-Sutcliffe efficiency (NSE) showed over 0.66 value). Annual SS yield value was 0.013 tons ha⁻¹. This result means SWAT has a potential for simulating sediment yields at forested head-watershed in Japan.