Abstract
In river planning, it is necessary to study the influence of river construction to the river flow and the river bed. A flow affected by the river construction is a three-dimensional complicated flow.
Sand deposition and scour around the construction is caused by this complicated flow which make it difficult to grasp the river change with the construction.
To investigate the mechanism of flows induced by spur-dike, we need the field survey around a spur-dike.
we are reporting new results obtained from the occurrence of secondary flow behind the spur-dike.
