Studies on the Hydro-Geomorphological Clasisfication and It's Quantification of Controlling Factors for Water Cycle in the Mountain Regions With Small Reliefs

为了弄清小起伏山区水循环的控制因素，我们从1989年起进行了水文地貌观测。至于花岗岩山区的实验流域，我们选择了在爱知东京大学森林的赤津流域和小原村的小原流域。为了与其他地质区域的分水岭进行比较，我们将犬山分水岭设置在爱知东京大学森林中，该分水岭被冲积扇存款的砂和砾石覆盖。今年，我们将重点放在表层，包括作为风暴流集中流动路径的凋落物。为了明确该层对径流产生的作用，在Akatsu和犬山实验流域进行了观测，并进行了水力传导率和持水特性的室内实验。虽然我们不能观察到地下水流在这两个层的凋落物和表面风化的土壤明显，它被证实，在表层土壤中的饱和通流发生在风暴事件。

Since 1989, we have carried out the observations on hydro-geomorphology to make clear the controlling factors of water cycle in the mountain regions with small reliefs. As for the experimental watershed in cases of granitic mountain region, we chose the Akatsu watershed in the Aichi Tokyo University Forests and Obara watershed in Obara Village. To compare with those watershed to another geologic area, we settled the Inuyama watershed in the Aichi Tokyo University Forests, which is covered by sand and gravel of fluvial fan deposit.In this year, we focused on the surface layer including, litter as concentrated flow path of storm flow. To make clear the role of such layer to the stream flow generation, observations in the Akatsu and Inuyama experimental watershed and laboratory experiments on those characteristics of hydraulic conductivity and water retention were carried out.From laboratory experiments, it was clear that saturated subsurface flow occurred through the litter layer overlying weathered soil. Although we could not observe subsurface water flows in both layers of litter and surface weathered soil distinctively, it was confirmed that saturated throughflow in the surface soil layer occurred during the storm event.