講演詳細

防災・水文部門[Forest Disaster Prevention and Hydrology]

日付	2024年3月10日
開始時刻	15:15
会場名	343
講演番号	J17
発表題目	Bedrock groundwater responses and its contribution to runoff generation processes in headwater catchments Bedrock groundwater responses and its contribution to runoff generation processes in headwater catchments
所属	University of Agriculture and Technology
要旨本文	Spatial variation of bedrock groundwater inflow in baseflow generation of 17.2 ha headwater catchment with six nested gauging stations was examined. The total channel length was 490 m with 100 m upstream ephemeral. Based on flow duration analysis, median flow at catchment outlet was 0.32 mm/day and low flow was 0.08 mm/day. Stream flow of 0.43 to 2.58 mm/day (9%) with API30 > 40 mm was defined as high baseflow, while that of 0.06 to 0.42 mm/day (40%) with API30 < 40 mm day was defined as low baseflow. For high baseflow period, runoff increased 2.5 times at the middle section. Hence, flow volume changes were trivial from middle to catchment outlet at both high and low baseflow conditions. Bedrock groundwater level at 30 m depth was elevated by 4.4 m at high baseflow and 2.1 m at low baseflow from baseline level. As the stream temperature increases were also mitigated until middle section, groundwater inflow at 30 m depth sustained stream flow in the discreet section of the channel.
著者氏名	○Nguyen Thi My Linh1 ・ Gomi Takashi2 ・ Onda Yuichi3 ・ Chiu Chen-Wei3 ・ Dinh Quynh Oanh4 ・ Shiraki Katsushige1
著者所属	1Tokyo University of Agriculture and Technology ・ 2Nagoya University ・ 3University of Tsukuba ・ 4Ha Long University
キーワード	Bedrock groundwater responses, Runoff generation, sedimentary rock, Rainfall-runoff processes
Key word	Bedrock groundwater responses, Runoff generation, sedimentary rock, Rainfall-runoff processes