STUDY ON THE IMPROVEMENT OF FLOOD MITIGATION FUNCTIONS OF FOREST BY CHANGING NEEDLELEAF FOREST TO NEEDLELEAF-BROADLEAF MIXED FOREST

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  • 人工林の針広混交林化による森林の洪水低減機能向上に関する研究

Abstract

<p> In this study, we examined the effects of the enhanced interception evaporation rate and surface roughness expected from changing needleleaf forest to needleleaf-broadleaf on flood mitigation functions. By conducting hydrological observations in the Hashimoto forestry area, which is a mixed forest of needle and broadleaf, the obtained interception evaporation rate and surface roughness were adapted to Nagayasuguchi dam and runoff simulation was conducted. We used a tank model for the spill simulation, which was evaluated in terms of peak flow rate and generation time. As a result, increasing the surface roughness reduced the peak flow rate by 6.1% relative to the 100 year Probabilistic rainfall, and increasing the interception evaporation rate reduced it by 3.6%. Therefore It was confirmed that this is an important function in flood reduction.</p>

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