Abstract
There are two types of alluvial fans land-use such as housing and farming in Japan. In recent studies and disaster reports, housing area have been considered and numerical analysis with detail landform describing houses and roads have seemed to explain the realistic debris flow influence area. However, farming area have not been considered. Furthermore, numerical simulation is effective for considering debris flow influence area but suitable resolution landform data for both land-use is not clear. In this study, we conducted debris flow simulation using Hyper KANAKO system in farming area and in housing area with different resolution landform data. The results showed that farming area with different landform data showed less difference for outer edge of influence area. But some field area showed large flow depth and depositions. In both land-use, 1-m mesh high resolution seemed to show realistic influence area and debris flow behavior.
