| Popis: |
In this paper, we propose a method of measuring free flow speed according to different water depth in the ponding situation. With different water depth, changes of tire-road friction coefficient caused by reduction of the wheel load are different. This coefficient brings great effect to vehicles free flow speed. In order to reveal this phenomena, observations data obtained in the year 2009 at the number 202 state road in Japan, which runs through Fukuoka, Itosima. By measuring the recording data, we got the speed range corresponding to different water depth. The purpose of this study is to obtain variation of free flow speed according to different water depth and lay foundations for numerical modeling in the future. |
