Accurate computation of the roughness coefficient is important in studies open channel flow. To measure and identify hydraulic characteristics flow system, model simulation necessary to study get results properties specify Manning Euphrates River. In this study, reach extended along River from Haditha Dam Ramadi Barrage with a distance 169km. The HEC-RAS was implemented simulate within reach. g...

Soil and water resources management of rivers has an important role because of direct relation withdifferent systems such as earth, life, social and people. Although the use of vegetation cover inbioengineering and biological stabilization and also soil and water resources management projects hasmany advantages, but improper methods of design and implementation cause hydraulic specificationsof ...

the security and stability of dams for flood passing through the spillway should be provided. so, kinetic energy of flow over large spillway must be dissipated. one of the energy dissipation structures at downstream dams, are plunging pools. the aim of this paper is to investigate dynamic pressure that is created by the impact of a series of rounded non-submerged jets on a flat plate with the r...

The measurement of scalar fluxes employing the eddy covariance method is a widely used experimental approach, for which the flow distortion due to obstacles (e.g., sensor mounts and mast) is a well-known but not fully solved problem. In order to reduce flow distortion we installed a sonic anemometer in a surface-normal orientation relative to the terrain slope, and a second instrument in a vert...

An experimental study has been made to compare the frictional resistance of several ship hull coatings in the unfouled, fouled, and cleaned conditions. Hydrodynamic tests were completed in a towing tank using a flat plate test fixture towed at a Reynolds number ~ReL! range of 2.8310 6 – 5.5310 based on the plate length and towing velocity. The results indicate little difference in frictional re...

Roughness elements in high speed flows can cause laminar-turbulent transition leading to higher heating rates and drag. Transition of flow past a hemispherical bump placed on a flat plate is explored in this paper for three Mach numbers [3.37, 5.26, 8.23] using direct numerical simulation on unstructured grids. The simulation parameters are chosen to match the experiments carried out by Danehy ...

An important feature of most rivers and canals is their habitats for a rich of aquatic vegetation which is extremely important from an environmental and ecological point of view. These variations in habitat mean that it is rare to find a cross-section of a natural channel which has the same roughness along its perimeter. In these channels, flow conditions lead to a complex flow situation with i...

OBJECTIVE Mechanical techniques, including scaling with metal, plastic, or ultrasonic instruments, rubber cup polishing, air-powder abrasive system and brushing with a conventional or a rotating brush, have been used for the debridement of dental implants. Recently, rotating brushes with titanium bristles (titanium brush) have been introduced for the debridement of implant surface when peri-imp...