摘要
用水槽试验对丁、潜坝的局部水头损失机理进行了探讨。应用平面绕流与旋涡理论,导出了非淹没单丁坝的局部水头损失公式。根据实测资料,得到计算单个丁坝在非淹没与淹没状态下,及单个潜坝的局部水头损失系数的经验关系。此外,还提出了计算丁坝群在淹没状态下的局部水头损失的方法,并给出淹没丁坝群在试验水槽与河工模型中的实际算例。结果表明,计算值实测值相符合。
Both spur and submerged dikes are conventional types of structure widely used in channel regulation and bank protection engineering. The flume experiments on local head losses at the dikes are described in this paper. The mechanism of local head loss due to spurdike is explored starting with unsubmerged spurs and an empirical relation for calculating local head loss coefficient is derived. The different constants in the empirical relation are determined for single spur under unsubmerged and submerged conditions, and submerged dike according to the experimental data. A concrete calculation procedure for local head losses due to submerged dike systems is presented and numberical examples are provided herein. The results of the computations show good agreement with the measured values in the flume and the spurdikes arranged in the scalemodel of Hanjian River.
