PERMEABILITY OF A RUBBLE MOUND WEIR

Abstract

The authors propose a rubble-mound-weir as a flow control structure of nature-friendly. It is expected that this type of weir would allow aquatic animals traveling along the streamwise direction, while conventional structures made of metal and concrete completely block their movement along a river. Once a discharge flow-depth relationship is identified, even such a permeable structure could have a function to impound water and control river flow. The present paper is to examine hydraulic characteristics of the rubble-mound-weir. Main focus was placed on an open channel flow running through the weir. The system is a turbulent flow running through porous media that is connected to an open channel flow at the up- and downstream direction. Water surface profiles and a discharge-water depth relationship were experimentally and theoretically investigated.