Hiroshi Aki

AN INUNDATION INSIDE THE LEVEE ANALYTICAL METHOD THAT CONSIDERED THE BASE FLOW OF THE DRAINAGE CANAL

An inundation inside the levee analytical method that considered the base-flow of the drainage canal was considered for the suburban area where the mountainous district and the field were contained, and the drainage-canal flowed. The base-flow is presumed from the unsteady flow calculation using the waterlevels data of the drainage-canal observed at low-water, and applied to an inundation inside the levee model. The analytical method of the present study was applied to inundation inside the levee in Nishisuga region in Tokushima city that had been generated by Typhoon No.11 in 2014. The following results were achieved. (1)The water-levels in drainage-canal could be reproduced when it was flooded. (2)The runoffcoefficient presumed by the analytical modeling and the runoff-coefficient calculated from material concerning the land-uses were roughly corresponding. (3)The ratio of the base-flow at the flood peak was estimated to be about 50%. The importance of the evaluation of the base-flow was suggested.

Habitat Assessment of Stony Coral by Using the PHSI Model and Formulating Restoring Nature Plan

The aim of this study is the habitat assessment of stony coral by using the PHSI and the formulation of restoring nature planning. The PHSI is introduced a probabilistic way of thinking into the HSI. We estimated the distribution of a colony of Acropora tumida (At) in 1972 and Lithophyllon undulatum (Lu) in 2003 by using this model in which five physics factors was involved. The estimated distributions well coincided with the observed them. And, we could formulate basic fundamental policies to increase the amount of residual flow by using the PHSI model.

THE EFFECT OF SPREAD ENLIGHTENMENT ACTIVITIES ON NATURE RESTORATION PROJECT AIMED AT CORAL

The total design of the nature restoration in Takegashima underwater park was planned out on the basis of investigation for about 3 years. The summary of this design and main enlightenment activities of 3 years from 2003 to 2005 were described. The effectiveness of enlightenment activities was examined by using the questionnaire surveys that had executed in 2003 and 2005. It has been understood that our enlightenment activities is not enough for improving an environmental consideration in the community.