2016 Volume 22 Pages 505-510
Ultra-low frequency sound could be generated by fall flow which is discharged from dam. In order to reduce ultra-low frequency sound, which can be neither be insulated nor absorbed unlike audible sound, countermeasure to control sources is indispensable. In Amagase Dam, which has 3 conduit gates, has a problem of ultra-low frequency sound generated by fall flow during the flood control operation.
This study proposed adjustment of discharge ratio of 3 gates as countermeasure, focusing on unit width discharge and form of water flow from 3 conduit gates. This report presents the outcome of this study because the effectiveness of the countermeasure is confirmed by the site observation in the Dam.
