By Pierre Y. Julien
The second one variation of this acclaimed, obtainable textbook brings the topic of sedimentation and erosion up to date, supplying a great primer on either primary thoughts of sediment-transport thought and techniques for functional purposes. The constitution of the 1st version is largely unchanged, yet the entire chapters were up-to-date, with a number of chapters remodeled and elevated considerably. Examples of the recent additions contain the concept that of extra mass, the transformed Einstein process, sediment shipping through dimension fractions, sediment delivery of sediment combos, and new strategies to the Einstein Integrals. Many new examples and workouts were further. Erosion and Sedimentation is a necessary textbook at the subject for college students in civil and environmental engineering and the geosciences, and likewise as a guide for researchers and execs in engineering, the geosciences and the water sciences.
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Extra info for Erosion and sedimentation
3 Equations of motion 37 After dividing by X, this gives an equivalent formulation as a function of the total volumetric sediment discharges Qsx = qsx W and Ax = ∀t / X = Wh as the reach-average cross-sectional area. 4) In the case of steady non-uniform one-dimensional ﬂow in the x direction, one can consider that qs = 0 and dCv /dt = 0. 5) This formulation is often referred to as the Exner equation. Notice that it assumes that all the sediment in the water column will deposit within the distance X and qsx is a volumetric unit sediment discharge.
Acceleration components are ax = ∂ vx /∂t = g/2, ay = az = 0. The gravitational acceleration components are gx = gy = 0, and gz = −g. 56 from the vertical. The buoyancy force only equals the Archimedes’ force in hydrostatic ﬂuids. 5 Bernoulli equation The Bernoulli equation represents a particular form of the equations of motion for steady irrotational ﬂow of frictionless ﬂuids. A gravitation potential g = gˆz can be deﬁned with the axis zˆ vertical upward such that the body acceleration components due to gravity are: gx = −∂ g −∂ g −∂ ; gy = ; and gz = ∂x ∂y ∂z g Since g is a constant, the directional acceleration components are g times the cosine between zˆ and the component direction.
6 100 (a) Plot the sediment size distribution; (b) determine d16 , d35 , d50 , d65 , and d84 ; and (c) calculate the gradation coefﬁcients σ g and Gr. 5 Consider energy losses HL in a straight open channel. The energy gradient HL /Xc in a smooth channel with turbulent ﬂow depends upon the mean ﬂow velocity V , the ﬂow depth h, the gravitational acceleration g, the mass density ρ, and the dynamic viscosity μ. Determine the general form of the energy gradient equation from dimensional analysis. 6 Consider a near-bed turbulent velocity proﬁle.
Erosion and sedimentation by Pierre Y. Julien