The piano key (PK) weir has advanced over the labyrinth to increase discharge capacity. Piano weirs exhibit nonlinear flow behavior and are easy place on existing spillway or newly constructed dam with less base area. Various investigators given equations calculate coefficient for free submerged conditions. study focuses reviewing impacts of PK geometry coefficient, including length height, ups...

Abstract Weirs are used to control and regulate the flow in open channels. In gabion structures, conditions more complex due complexity of through porous body a gabion. The present study aims investigate water surface profile, overflow velocity both through-flow ratios. Six physical models three downstream slopes (V:H 1:1, 1:2, 1:3) two types rockfill (crushed stone rounded gravel) were investi...

The identification and characterization of barriers to river continuity are essential for the preparation an inventory hydraulic infrastructure. To this end, it is necessary define main identifying characterizing elements infrastructures descriptors ecological continuity, with information that can characterize them from point view their impact on watercourse. Several authors have defined decisi...

Abstract Climate change has caused the inefficient operation of a significant number old weirs to pass large discharges. Therefore, this study aims increase discharge capacity labyrinth weir. A new approach was proposed by modifying weir structure. The data obtained from quarter-round crest and different sidewall angles ranging 8 35°. conventional used for comparison. results showed that percen...

Abstract Weirs are one of the most common hydraulic structures used in water engineering projects. In this research, a group method data handling (GMDH) was developed to estimate energy dissipation flow passing over labyrinth weirs with triangular and trapezoidal plans. To compare performance model other types soft computing models, multilayer perceptron neural network (MLPNN) developed. The di...

We present a platform for parallelized manipulations of individual polarizable micron-scale particles (i.e., microparticles) that combines negative dielectrophoretic forcing with the passive capture of hydrodynamic weir-based trapping. Our work enables manipulations using ejection- andor exclusion-based methods. In ejection operations, we unload targeted weirs by displacing microparticles from ...

Piano Key Weirs (PKWs) are an alternative to linear overflow structures, increasing the unit discharge for similar heads and spillway widths. Thus, they allow to operate reservoirs with elevated supply levels, thereby providing additional storage volume. As they are relatively novel structures, few design criteria are available. Hence, physical model tests of prototypes are required. This study...