水田貯留による雨水の流出抑制効果とその強化方策に関する現地実験

抄録

In order to deal with recent change of runoff characteristics by urbanization of a river basin, construction of facilities for rainwater storage and infiltration has been planed as a flood control measure in the basin. However, the construction plan has not been in progress due to high costs and limited sites for the facilities. Then in this paper, we propose a new utilization method of paddy fields remained in the basin as an alternative measure. This research aims to evaluate rainwater storage function of paddy fields and to verify a new procedure to improve the function, through on-site experiments carried out in the Shin-kawa basin, Aichi prefecture. A hydraulic model on the water-balance of a paddy field is identified based on observed data of the experiments, and by using the model the storage-drainage processes in a paddy field are simulated on a probabilistic design rainfall. From results of the simulation, it is found out that paddy fields have applicability as the runoff control facilities.