Braided rivers are widespread in nature, and their bed morphology is complex variable. This paper aims to investigate quantitatively analyze the surface roughness of braided utilizing statistical theory. In this paper, a physical model developed, four constant discharge experiments carried out. Based on Structure-from-Motion photogrammetry direct measurement bedload transport using load cell, d...

Logarithmic and variable-power equations that use the bed D84 grain size as a roughness metric reproduce general trend of flow resistance in streams with coarse beds, but they are unreliable for predictions individual reaches. For site-specific application these equations, I propose an effective height can be calibrated by making single measurement. test this idea using published velocity-depth...

Articles you may be interested in Erosion threshold of a liquid immersed granular bed by an impinging plane liquid jet A comparison of the predictions of a simple kinetic theory with experimental and numerical results for a vibrated granular bed consisting of nearly elastic particles of two sizes Onset of erosion and avalanche for an inclined granular bed sheared by a continuous laminar flow We...

In nature, environmental and geophysical flows frequently encounter submerged cylindrical bodies on a rough bed. The around the bed are very complicated as flow field in these cases will be function of roughness apart from diameter cylinder velocity. addition, sand-bed has different effects compared to gravel-bed due differences heights. Therefore, main objective this article is compare mean ve...

Waves are main characteristics of seas that produce by wind. Importance of the study of waves and recognizing the wave climate in the coastal zone management that the waves are the most important influence on the design and implementation of all projects. Wave are main boundary condition in dynamic loading and structural calculations and hydraulic coastal structures. Height of waves are the mos...

In this paper twelve different empirical resistance coefficients expressed in terms of Manning's roughness are used apiece in seventeen known compositing methods. The data obtained from ten different cross-sections of the Sefidrood River, Iran, are used for the evaluation of the empiricalformulas. The present case-study is selected from a reach with gravel bed topology. Then no remarkable bed f...

Abstract: Drag force at the bed acting on water flow is a major control on water circulation and sediment transport. Bed drag has been thoroughly studied in sandy waters, but less so in muddy coastal waters. The variation of bed drag on a muddy shelf is investigated here using field observations of currents, waves, and sediment concentration collected during moderate wind and wave events. To es...