By Athol D. Abrahams, Anthony J Parsons
Encompassing geomorphology, hydrology and agricultural engineering, this gives an interdisciplinary assessment of an issue vital in either clinical And sensible phrases - With the categorical target of marketing interplay among modellers, box employees and laboratory experimentalists.
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Additional info for Overland Flow: Hydraulics And Erosion Mechanics
40 cm, was obtained near Lincoln, Nebraska. 3. Shape factors provide a relative estimate of the physical configuration of gravel and cobble material. Little variation in shape factor was found between size classes. 7 is typical (Guy 1969). Gravel and cobble materials were glued in a random orientation onto a section of reinforced fibreglass sheeting located within a flume. 3. The percentage of surface cover was obtained using a photographic grid procedure (Laflen et al. 1978). Gravel and cobble materials on the fibreglass sheets were photographed using 35 mm colour slide film.
5 and wave resistance at higher Froude numbers. Consequently, resistance equations for use in process-based mathematical models of interrill overland flow should include surface-form variables such as percentage gravel cover. Although this recommendation represents a break with the traditional practice of employing resistance equations which simply relate f to Re (or surrogates thereof), it does not necessarily pose daunting problems, as surface form variables can be measured at any time and applied to all runoff events.
Reynolds number values used in this study were substantially less than those found in some of the other investigations. 5 m long. 1 m and a length of 183 m. In both studies, hydraulic measurements were collected under steady-state conditions. In addition, selected measurements were made to identify plant characteristics. Roughness coefficient equations Most of the hydraulic tests were performed at relatively large discharge rates which caused the vegetative materials to become submerged. Few of the tests were run at Reynolds number values which could be considered representative of overland flow conditions.
Overland Flow: Hydraulics And Erosion Mechanics by Athol D. Abrahams, Anthony J Parsons