山腹斜面における浸透特性と雨水流出経路への植生の影響

抄録

This research observes the effect of vegetation on the spatial rate of infiltration and on the resulting path of flow inside the soil. Aside from infiltration experiments, paint tests and soil potential measurements were made. Results show that (a) the infiltration rates are dependent on the distance from the tree stem, (b) variations in infiltration rates are small for heavily forested areas compared to sparsely vegetated areas. It was also found that (c) the flow in the soil is mainly vertical. Finally it was found that (d) there is bottom-upsaturation in the soil even for small rains.