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Download Overland flow. Hydraulics and erosion mechanics by Parsons A.J., Abrahams A.D. (eds.) PDF

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By Parsons A.J., Abrahams A.D. (eds.)

Encompassing geomorphology, hydrology and agricultural engineering, this gives an interdisciplinary overview of a subject vital in either medical And sensible phrases - With the categorical goal of selling interplay among modellers, box employees and laboratory experimentalists

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Sample text

6 Diameter, length, residue rate and surface cover of crop residue materials. 15. Information on the rate of residue present at a particular site may be more readily available than surface cover data. Regression equations relating roughness coefficients to residue rate and Reynolds number were presented by Gilley et al. (1991). Procedures for estimating surface cover from values of residue rate were also identified for the selected residue materials. Roughness coefficients on interrill areas Experimental procedures Field tests to determine roughness coefficients for interrill areas were conducted by Gilley and Finkner (1991) at the University of Nebraska Rogers Memorial Farm located in Lancaster County, approximately 18 km east of Lincoln, Nebraska.

6). Yen (1965) reanalysed the flume data of Herbich & Shulits (1964), who used concrete cubes as roughness elements, and obtained a similar relationship. Flammer et al. e. 5. 5 and was up to 10 times greater than surface and form resistance combined. Although these laboratory studies employed cylinders, cubes and hemispheres, it seems very likely that their findings relate in a general way to overland flow over gravel-covered semi-arid hillslopes. 5

Experimental study of Horton overland flow on tropical hillslopes. 2. Hydraulic characteristics and hillslope hydrographs. Zeitschrift für Geomorphologie Supplementband 35, 60–80. A. Banks 1950. Fluid resistance of composite roughness. Transactions of the American Geophysical Union 31, 603–10. A. Barbarossa 1952. River channel roughness. Transactions of the American Society of Civil Engineers 117, 1121–32. Emmett, W. W. 1970. The hydraulics of overland flow on hillslopes. US Geological Survey Professional Paper 662-A.

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