Flooding is a major problem for many countries causing damage to the environment and pressures on human activity. Engineers use Manning’s coefficient of roughness to determine water flow over floodplains which is a vital parameter in hydrodynamic studies. The coefficient is mainly a property of the ground surface texture and the changes in water surface elevation. The traditional method of dete...

Aquantitative relationship is demonstrated between the coefficient of static friction and the milling process parameters. Different levels of surface roughness are obtained by varying the spindle speed, depth of cut and feed which is followed by measurement of surface roughness using stylus profile meter. The corresponding coefficients of static friction are measured for all specimens using inc...

different construction materials with different roughness used to make circular weirs highly affect surface roughness and, in turn, flow hydraulics passing over these structures.  in the present research, numerous experiments under different hydraulic conditions were performed on a physical model to study the effects of roughness on flow hydraulics over a circular weir. the flow hydraulics incl...

We investigate the impact of the surface roughness on the experimental value of the electrocapillary coupling coefficient, ς. This quantity relates the response of electrode potential, E, to tangential elastic strain, e, and also measures the variation of the surface stress, f, with the superficial charge density, q. We combine experiments measuring the apparent coupling coefficient ςeff for go...

Abstract Spatial modelling of flood-prone areas will provide maximum results if it is supported by the accuracy data acquired, mainly related to elevation or area’s topography. generated from accurate topographic can estimate river’s carrying capacity. This study built a spatial model using aerial, terrestrial, and hydrographic surveys. Aerial surveys were conducted UAV corrected terrestrial su...

Abstract In this study, the CCHE2D model was used to analyze flow patterns in Tigris River Baghdad city around a water treatment plant. To end, calibrated and validated steady-state using relevant boundary conditions. The initial surface level at Sarai station for three discharges of 289, 530, 870 m 3 /s. Hence, appropriate manning roughness modulus equivalent mixing length turbulent models wer...

To explore the characteristics of overland flow resistance under condition sparse vegetative stem coverage and improve basic theoretical research flow, were systematically investigated four slope gradients (S), seven discharges (Q), six degrees vegetation (Cr). The results show that Manning roughness coefficient (n) changes with ratio water depth to height (h/hv) while Reynolds number (Re), Fro...

A new bulk parameterization of the air–sea momentum flux at high wind speeds is proposed based on coupled wave–wind model simulations for 10 tropical cyclones that occurred in the Atlantic Ocean during 1998–2003. The new parameterization describes how the roughness length increases linearly with wind speed and the neutral drag coefficient tends to level off at high wind speeds. The proposed par...

In terms of the hydraulic effect plant flexibility, particular note is calculation formula that was proposed by Kouwen, which combines roughness riverbed with community parameter MEJ (including modulus elasticity). Kouwen’s method developed on basis laboratory experiments low vegetation (grasses). According to authors this work, can also be used evaluate resistance medium (shrubs) deforming und...