A HYDRAULIC RESISTANCE LAW ON TREES CONSIDERING DEFORMATION OF FOLIAGE AND NUMERICAL SIMULATION OF INUNDATED FLOW ON A COASTAL FOREST WITH THE LAW

Abstract

Evaluation of hydraulic resistance on trees considering deformation of foliage and similarity law for deformed foliage under fluid experiments were carried out to establish countermeasures used a costal vegetated area for tsunami disaster reduction. A mechanism about deformation of foliage was evaluated by simplified model based on elastic, applicability of the model and characteristics of hydraulic resistance about trees with deformation of foliage was investigated experimentally. To verify influence of hydraulic resistance on trees deformed foliage on the inundation, another experiment and numerical simulation were carried out, and importance to considering deformation of foliage were shown by comparison experimental and numerical results. Furthermore, numerical simulations about tsunami inundation in a coastal forest of Nihonkai-Chubu Earthquake Tsunami were performed, importance to considering hydraulic resistance on trees considering deformation of foliage was suggested when examining countermeasures used a costal forest for tsunami disaster reduction.