落葉層の貯留効果に関する基礎的研究

抄録

The purpose of this study is to understand effect of different litter layers on water storage. An experimental system with rainfall variation expresses the storage process through measurements of discharge and soil moisture. Also 2D Richards model with hysteresis and the experimental results show the permeability of different litters, broadleaf, acicular, and laurel. The litter layers increases the storage effect as slope angle increases. Broadleaf and laurel have larger storage capacity than acicular. Application of the model with hysteresis is approximated to survey data. In Richards equation with hysteresis, The vertical water permeability of a litter layer is expressed in the half permeable of the soil.