The Phenomenological Theory of Turbulence and the Scour Evolution Downstream of Grade-Control Structures under Steady Discharges

A more complete understanding of scour mechanisms for flows downstream grade-control structures, including their temporal evolution, has the potential to lead improved predicting tools design. To date, design equations have been mostly derived empirically, i.e., by parametric modelling (at generally-small scales) corresponding specific structure configurations, and limited ranges hydraulic conditions. Although these approaches allowed different authors propose many empirical and/or semi-empirical equations, they lack generality may incorrect estimations when applied outside validity. First-principles-based methods with solid calibration validation procedures can overcome issues. Following recent theoretical advancements presented elsewhere last three authors, in this work we analyze test predictive capability a evolution model based on phenomenological theory turbulence (PTT) using large dataset pertaining structures. PTT was developed (and validated) caused oblique vertical plunging jets, show that its basic assumptions are still valid addressed low-head encompassing rock stepped gabion weirs, bed sills, others. Furthermore, also provide interesting insights contrasting our against experimental data Results comparison conclusively general validity represents trustable tool estimate regardless configuration