This investigation deals with the mechanics of movement singular quartz gravel and coarse sand riverbed particles upstream over inlet key three Type A piano weir (PKW) models, which were recorded a high-speed camera. Acoustic Doppler velocimeter was used to obtain bed shear stress. The sediment threshold regime compared previous investigations found be within ranges. Generally, particle deceler...

Abstract Labyrinth weirs are complex hydraulic structures. They have been widely used as a water regulator and to increase discharge in channels spillway dams. an economical effective method pass large floods. In addition, they reduce the requirements of structural footprint. These features make them interesting appropriate choice capacity discharge. Several factors affect performance labyrinth...

Flowmetry. Fluid-flow measurement and visualisation ................................................................................ 1 Measuring mass flow-rate ......................................................................................................................... 2 Accumulative weighting .............................................................................................

The objectives of this study were to clarify the effects scale on farmland drainage water and nitrogen phosphorusload discharged in hilly irrigation areas. An experimental was conducted monitor volume phosphorus concentrations at field, lateral ditch (with a control area 1.16 km2), branch 7.76 watershed 43.3 km2) scales Yangshudang Zhanghe Irrigation District during rice growth period 2022. res...

Abstract The circular crested weir (CCW) has been introduced as weirs having a high discharge coefficient (Cd). ratio of flow head to the radius crest ( H / R ) is most important parameter affecting Cd, that $${\text{Cd}} \approx a\left( {H/R} \right)^{b}$$ Cd ? a <mml:m...

Laboratory experiments were carried out to investigate the hydraulic characteristics of full-cycle cosine and rectangular sharp-crested weirs in free flow condition. The head–discharge relationships determined theoretically discharge coefficients correlated with weir geometry for both rigid erodible bed conditions. proposed model showed higher comparison weirs. three-dimensional velocity profil...