丘陵地斜面域における雨水の浸入・流出過程

Abstract

As the results of infiltration test and soil survey in slopes of the Shimokari watershed, it was disclosed that the final infiltration capacity is too large in view of the soii characterand that a large number of crack and hole is formed in soil layer by active and dead roots.On the basis of these facts, a mathematical runoff model composed of surfase runoff, interfiow, rapid and slow groundwater runoff is discussed in this paper. The surface runoffand interfiow are treated as the kinematic wave in surfase of slope. The rapid groundwaterrunoff is simulated as the component supplied through cracks and holes, and the slowgroundwater runoff is solved as the vertical percolation in unsaturated capillary zone.The applicability of this model is examined to simulate runoff for the period of fourmonths in the Minegado experimental watershed of 12. 95 ha in area which is part of theShimokari watershed.