Study of Embankment Performance during Overtopping and Throughflow. Report 2. Hydraulic Study and Modeling of Models

摘要

An experimental program involving three rigid and three erodible model embankments is described. The rigid embankments are constructed of aluminum and are used to evaluate flow quantity and to measure resulting water velocities as well as to perform a modeling of models study. Erodible embankment models were constructed of characteristic soils and were used to evaluate and document erosion in the scale models. Three scaling ratios used during this study were 1/24th scale, 1/49th scale, and 1/71st scale for both the rigid and erodible embankments. The system delivering overtopping water to the model is described along with other details of the centrifuge equipment and specimen preparation and testing techniques. A total of seven tests was performed in this investigation in which erosion rates were documented and time scaling factors were determined. The study confirmed that model behavior duplicated field behavior at least qualitatively in that erosion, as the result of overtopping, begins at the toe of the slope of an embankment then progresses upslope and through the crest as complete breach is observed. (fr)