地盤構造と浸透特性が湧水湿地の形成・維持に与える影響に関する数値解析による検討

抄録

A rainfall infiltration analysis was performed for one year using daily weather data to clarify the formation and the mechanism of maintenance of a spring- water marsh located on a gravel formation. The ground was divided into the soil layer and gravel layer, with these both composed of a vertical percolation layer，lateral drainage layer，and barrier soil layer. The analysis showed that the largest water discharge from the ground was that from the soil layer, by evapotranspiration. Water storage in the gravel layer was about 20 times that in the soil layer. Water was stored in the gravel layer during the wet season and discharged slowly in other seasons. The existence of a thick gravel layer was the cause for continuous drainage throughout the year.