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Sediment transport by overland flow over an area of net deposition

✍ Scribed by L. Beuselinck; G. Govers; A. Steegen; T. A. Quine

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
217 KB
Volume
13
Category
Article
ISSN
0885-6087

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✦ Synopsis

Flume studies were conducted in order to evaluate the in¯uence of slope, sediment size, discharge and in¯ow sediment concentration on sediment deposition by overland ¯ow. Additionally, experiments were carried out to measure transport capacity of overland ¯ow at low slopes, using a wide range of discharges. The experimental data show that the hydraulic conditions where net deposition occurs can be divided into two domains. The ®rst domain is characterized by hydraulic conditions where transport capacity is not signi®cant. In the second domain net deposition still occurs but transport capacity is signi®cant. The size of the latter domain is dependent on the sediment size distribution, on the hydraulic roughness and on the in¯ow sediment concentration. The experiments clearly indicate the necessity of incorporating a threshold value in any deposition equation. These experiments demonstrate that shear stress is a valuable threshold for deposition modelling.

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✍ Beuselinck, L.; Govers,, G.; Steegen, A.; Hairsine, P. B.; Poesen,, J. 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 278 KB 👁 1 views

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