A New Approach of Sediment Transport in the Design and - download pdf or read online

By Herman Depeweg

ISBN-10: 0203945816

ISBN-13: 9780203945810

ISBN-10: 0415426936

ISBN-13: 9780415426930

The shipping of sediment tremendously affects the sustainability of an irrigation method. Erosion and deposition not just elevate upkeep expenditures, yet can result in an inequitable and insufficient distribution of irrigation water. figuring out the behaviour and shipping of sediment permits effective making plans and trustworthy water supply schedules, and guarantees the managed deposition of sediments, making upkeep actions extra doable. those lecture notes current a close research of sediment shipping in irrigation canals, including actual and mathematical descriptions of the behaviour. A mathematical version predicts the sediment shipping, deposition and entrainment expense for numerous stream stipulations and sediment inputs. The version is very appropriate for the simulation of sediment shipping in irrigation canals the place circulation and sediment shipping are principally made up our minds by way of the operation of circulation keep an eye on buildings.

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Additional info for A New Approach of Sediment Transport in the Design and Operation of Irrigation Canals (Unesco-Ihe Lecture Note Series)

Sample text

6). In the horizontal direction, the velocity distribution is influenced by the B/y ratio. For a non-wide canal (B/y < 5), the velocity distribution is threedimensional. When the B/y ratio is larger than 5, the velocity distribution becomes almost two-dimensional with the exception of a small region near the vertical sidewalls. Corrections in view of the average velocity The velocity distribution in the vertical and width direction of a canal incorporates the fact that the velocity is not the same in all the points of the cross section.

Summary of water surface profiles in wide canals (R = y and q = Q/B). 13. Overview of the most common water surface profiles in wide canals. Gradually varied flow can be computed by three methods: direct integration; graphical integration and numerical integration. 6. 6. Summary of the methods for computing gradually varied flow. g. the water depth y or the discharge Q varies at a certain point of the canal system with time. Waves travelling in canals are examples of unsteadiness; they can be classified as: • Translatory waves with a net transport of water in the direction of the wave; translatory waves are the most common type of waves in open channels.

The related hydraulic problems are governed by two concepts, namely storage and conveyance. For an incompressible flow in canal networks the storage concept deals with the conservation of water volume. The conveyance concept deals with the balance of forces acting upon a water mass and their effect on the momentum balance. In this context, the amount of momentum loss due to channel friction relative to the increase of momentum due to the gravity forces is an essential aspect. One of the important parameters influencing the capability of a canal network to adapt itself to changes is its storage capacity.

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A New Approach of Sediment Transport in the Design and Operation of Irrigation Canals (Unesco-Ihe Lecture Note Series) by Herman Depeweg

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