谷頭凹地におけるパイプ流の流出機構の検討 : 京都大学芦生演習林内トヒノ谷流域におけるパイプ流量,水温,土壌間隙水圧の観測

概要

論文の詳細を見る
Simultaneous measurements of discharge of pipeflow, soil pore water pressure, soil temperature, and pipeflow temperature were undertaken to evaluate the runoff generation of pipeflow in a steep unchanneled hollow in Kyoto University Forest in Ashiu, central Japan. Temperature of pipeflow indicated that the pipeflow had a variety of sources. During a relatively heavy rainfall of 72.5 mm in 27 hour, the pipeflow was mainly delivered from the bedrock fracture. During the heaviest rainfall of 193.5 mm in 64 hours, the pipeflow delivered groundwater from an upslope area directly to a soil pipe outlet, without mixing with the soil water. In this case, the discharge of pipeflow varied with the soil pore water pressure on the upper slope, the soil pore water pressure near the soil pipe outlet remaining nearly constant. The transient groundwater at the upper hillslope was commonly dominated by the pre-event soil water, but only after the large storms with wet antecedent conditions, water was emerging from the bedrock and mixing with pre-event soil water in the transient saturated area at the upper hillslope. Thus, after the large storms, the bedrock groundwater played an important role in runoff generation of pipeflow.
日本地形学連合の論文
2002-10-25