Effect of complexity in geography and canopy structure on wind environment over forest ecosystem. Application of CFD on evaluation of forest management scenario.

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The objective of this project is to establish the evaluation model for the effect of forest management scenario on wind synopsis on forest in special reference to geography and canopy topography. We clarified the relationship between crown profile and drag relations and create linkage model on forest canopy dynamic model and Computational fluid dynamics model.We found lateral leaf area index and clumpiness of leaf distribution affected on both drag coefficient and streamlining in Japanese cedar and cypress, but the effecting manner was found to be different between tree species. We predicted the wind synopsis on canopy surface in different thinning scenario through linking canopy topography and CFD, we clarified the eddy generated due to canopy gaps and clarified thinning ratio and direction of gaps affected the proportion of damaged trees. We also found that estimation model with ignoring downward wind provided 20% underestimation of number of damaged trees.