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The paper is written about the flow behavior over the square roughness, which are set obliquely on a bed of an open-channel. In the experiment, a single and more square roughness is set obliquely on the bed, and the ratio of the water depth to roughness height and the length of roughness are changed. The aim of this study is to investigate an existence of the spiral flow. By using such spiral flow, sediment load and floating material in the flow may be sent to the downward of channel. In the case using long roughness, the existence of spiral flow is recognized clearly but for the case shorter roughness, in such case between a pointed end of roughness and right side wall, there is no obstacle, such spiral flow can not be recognized so clearly. And in such shorter case, strong secondary flow from left side to right side along the bed is not produced.

FLOW OVER THE SQUARE ARTIFICIAL ROUGHNESS SET OBLIQUELY ON THE BED OF AN OPEN CHANNEL