樹林帯の崩土減勢効果の評価手法に関する一検討
2007 年 60 巻 3 号 p. 32-37
詳細
2007 年 60 巻 3 号 p. 32-37
Amid growing concerns over the natural environment and scenery of slopes in recent years, the trees' effect of reducing slope failure sediment movement has been drawing more attention, and more studies have been conducted aimed to establish its quantitative evaluation. To calculate the distance of slope failure sediment movement, we have presented equations, in this paper, which include the effect of trees as a resistive element based upon the existing slope failure sediment movement models. To indicate the trees' effect in the equations, we obtained its coefficient values, using the results of experiments with buffer forest zone models. Further, picking up some real cases of slope failure sediment movement that had actually occurred on a slope with trees, we calculated the distance of each slope failure sediment movement by using the equations. The calculation results indicated that in two cases where the lower part of the slope was rather gentle with an incline of 10 degrees, the sediment movement would stop halfway. This was found right since the calculated value on the sediment movement distance was relatively close to the actual measurement. Meanwhile, it was also learned that in other four cases in which the slope was evenly inclined within the range from 33 to 36 degrees, the sediment movement would not stop.
