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The hydraulics of flow in the irrigation and drainage channels is indeed complex for many reasons in natural conditions. Such channels are required to carry a certain specified discharge of water which is charged with sediment load of suspended and bed material. The boundaries of the channel are thus in a state of constant flux. Bed and banks, although initially flat surfaces, may soon be covered with ripples and dunes. These are in effect large elements of surface roughness having a strong influence on the overall channel friction. Stability of these channels is defined as a state of equilibrium such that the particles on the surface of such channels are in a critical condition of movement. A channel shape which ensures that the particles everywhere on the channel surface are subjected to a resultant boundary stress which equals the critical shear stress is a stable profile. When the capacity for transporting sediment of a channel is equal to the time rate of sediment supply at its head, it is said to be a stable channel. Stable channels are also sometimes called regime channels. Recent empirical and theoretical work on irrigation channels suggests in natural form that instability is inherent. An occurrence of multiple cut-offs at river meanders could be interpreted as a clustering associated with self-organized criticality. Types of meander behaviour ranging from stable to chaotic are examined as trajectories or attractors within the phase space of rate of meander movement and bend curvature and change to the system is explored as shift from one attractor to another. It is suggested that this new approach provides insights into meander dynamics and provides a basis to identify the conditions, limits and constraints under which different behaviour occurs. Meanders have been subject to much analysis, of various kinds, in fluvial geomorphology because of their remarkable forms, their dynamism and the practical consequences of their movement. The aim of this book is to examine evidence of complex behaviour at natural irrigation and drainage boundaries, and, in particular, possible operation of self-organized criticality in meandering systems, using primary evidence of a field study and also evidence from a kinematic model.
- Table Of Content
Title Irrigation and Drainage Management Table of Content Natural Irrigation and Drainage, Regime Theory, Empirical Correlation and Regression Theory, Tractive Force Theory, Threshold Channel Geometry Theory, Similarity Principle. Section 3, Minimum Variance Theory, Threshold Channel Geometry Theory (Downstream Section, Maximum Sediment Discharge Theory (White et al.’s Work): Derivation of Hydraulic Geometry. Hypothesis, Maximum Sediment Discharge and Froude Number, Bedform Migration, Braided River, Chapter. Meander Theories, Meandering Boundary Layers, Modelling width Adjustment in Meandering Channels, Hydraulic Geometry Relations Using Du Boys Type Bed Load Formulae, Hypothesis of Maximum Friction Factor (Davies et al. Work), Minimal Channel Mobility Theory, Hydrodynamical Theory, Thermodynamic Theory, Minimum Energy Dissipation Rate Theory, Entropy Theory, Fluvial Process Hydraulic Geometry Relations Page No. 403 Author's Name Levent Yilmaz Publisher Studium Press LLC Year Of Publication 2012 ISBN 10 1-933699-28-0 ISBN 13 No About The Book No Binding type No Book Size(len) No Series No book size(hei) 10 Book size width 7 Edition 1st
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