Author(s): Akihiro Tominaga; Naohiko Sassa; Yuji Hara; Yuka Kuno

Linked Author(s): Akihiro Tominaga

Keywords: No Keywords

Abstract: The existence of a planform vortex is considered to be the cause of development and sustention of large-scale local scouring in the Kiso River. In order to make clear the 3D flow structures in this deep local scour, we conducted a field observation and model experiments. From the result of ADCP set on the bottom of the scour hole, the velocity in the hole was increasing and the vertical vortex was developing, with an increase of river discharge. It is indicated that considerable magnitude of velocity was generated even near the bottom by the action of vertical vortex. This vortex was recognized in the model experiments. Consequently, the vertical vortex contributes to develop and maintain the large-scale local scouring.

DOI: https://doi.org/10.1051/e3sconf/20184003015

Year: 2018