نتایج جستجو برای: bed roughness
تعداد نتایج: 70522 فیلتر نتایج به سال:
In Sistan plain, conditions for wind erosion and, consequently, sand spreads are provided. Due to the settlements in the wind erosion centers of this area, the necessity of determining the origin of sands, the analysis of the hazards caused by the displacement of sand dunes and factors creating these hazards are the goals of this study. It is a descriptive-analytical study based on both field a...
Manning's roughness coefficient for flow over bare soil is needed in order to determine other hydraulic parameters such as flow depth and velocity in overland flow, parameters needed to calculate streampower and shear stress in erosion process studies. A modified equation of Manning's n was developed to estimate flow velocity in shallow overland flow in experiments undertaken in a 5.8 by 1 m fl...
LiDAR–based DEMs are almost essential when it comes to high resolution floodplain modelling. Conventional LiDAR does not penetrate water bodies and additional bathymetric measurements are necessary to complete any parts of a DEM which were under water at the time of the LiDAR sortie. Bathymetric data collection is time-consuming, expensive and it requires careful processing to correctly interpo...
In this study accuracy of the ANFIS and ANFIS-PSO models to estimate hydraulic jump characteristics including sequence depth ratio, the jump length, the roller length ratio, and relative energy loss was evaluated in stilling basin versus laboratory results. The mentioned characteristics were measured in the stilling basin with a rectangular cross-section with four different adverse slopes, four...
Flow conditions (flow discharge, flow depth, and velocity) in natural streams are mainly determined via the resistance formula such as Manning’s equation. Evaluating accurate roughness coefficient (n), especially rivers with bed form during floods, to obtain more reliable results has always been of interest scholars. The interaction between is very complex since control forms, vice versa. main ...
The hydraulic behavior of the flow can be changed by using large-scale geometric roughness elements in open channels. This change help controlling erosions and sedimentations along mainstream channel. Roughness large stone or concrete blocks placed at channel's bed to impose more resistance bed. geometry elements, numbers used, configuration are parameters that affect flow's characteristics. In...
Metal additive manufacturing, particularly laser powder bed fusion, is increasingly used in the gas turbine industry for fabrication of channels with small diameters conformal cooling and flow passage applications. A critical challenge this context lies evaluating aspects such as geometrical hydraulic diameters, effective area roughness on internal surface channel that affects functionality. Th...
The influence of the main process parameters, laser power, point distance and time exposure, on surface microgeometry Ti6Al4V specimens produced by a pulsed powder bed fusion was investigated. A 3D characterization carried out collected data were elaborated to reconstruct determine both 2D material ratio curves along different directions. curve gives slightly lower peak zone Mr1 higher valley M...
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