Abstract
Resent studies have shown that group of non-submerged spur dikes can provide a valuable habitat for fishes and macro invertebrates in addition to the function to established a more desirable river for a flood, navigation and bank erosion. In this study, we investigated experimentally the effects of non-submerged spur dikes on bed configurations, water surface oscillations and mean flow characteristics in the cases that spur dikes were positioned facing upstream, downstream and normal to the main flow. The results showed that the spur dikes facing downstream led to the maximum scour at the tip of the dikes, the maximum one in the main channel bed. In addition, it was found that in the case with a facing downstream, resistance is largest.
