A Study on the Energy Dissipation Hexa-hallow Tri-leg Structure for the Scouring Hole of the Check Dam

• Main Authors: Lee, Jung-Cho, 李榮著
• Other Authors: Tuan-Hao
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/03522284012025804910

碩士 === 國立中興大學 === 水土保持學類 === 84 === This study simulates the natural scouring hole and it' s depositing heap to use the hexa-hollow tri-leg structure as the apron of the check dams and to search the better way to place them. The experiment conducted under the non- sediment flow with fixed dam height of 15cm. Every way of laying the hexa-hollow tri-leg structure has four bed slopes and five discharges to test. And the last row of hexa-hollow tri-leg structure raised to be higher 2cm,4cm, and 6cm, respectively, than the original river bed. According to the results of experiments, we would find that the energy dissipation efficiency has a positive correlation with the bed slope,but a negative correlation with the discharge. For the residual energy on the end of hexa-hollow tri-leg structure, it happens to have the opposite situation. The influence of the different height of the last row of placed hexa-hollow tri-leg structure is nearly the same, but anyway, the rise of the last row structure is better. So we can consider to raise it properly.