Advances in Water Resources Engineering by Chih Ted Yang, Lawrence K. Wang

By Chih Ted Yang, Lawrence K. Wang

This e-book, Advances in Water assets Engineering, quantity 14, covers the themes on watershed sediment dynamics and modeling, built-in simulation of interactive floor water and groundwater platforms, river channel stabilization with submerged vanes, non-equilibrium sediment shipping, reservoir sedimentation, and fluvial approaches, minimal power dissipation price concept and purposes, hydraulic modeling improvement and alertness, geophysical tools for overview of earthen dams, soil erosion on upland components by means of rainfall and overland circulate, geofluvial modeling methodologies and purposes, and environmental water engineering glossary.

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0 for the rising limb and 0 for the receding limb θ The angle of the sliding face Saturated volumetric water content of the topsoil, m3/m3 θus Θx The Shields parameter denoting the strength of flow at the position x Density of sediment laden flow, kg/m3 ρm ρs Density of sediment particles, kg/m3 σ Normal stress, Pa Shear stress of the water flow, Pa τ Incipient shear stress, Pa τc Additional cohesive strength, Pa τ′ Internal friction angle, which is assumed to be invariant with water φ content Settling velocity of sediment particles, m/s ωs (1 − θus) · Dρs Mass of particles per layer per square meter 4 G.

7. Overall, the simulation results during the period of model validation seemed to be a little worse than those during the period of model calibration. However, they still clearly reflected the soil erosion process at the Zichang station, which further proved the validity and practicability of the DYRIM. 3 Application in the Coarse Sediment Source Area The highest annual sediment yield in the recorded history of the Loess Plateau occurred in 1967 in the coarse sediment source area. 39 × 109 t. Year 1977 was another typical year that had a large amount of sediment yield and high sediment concentration.

Fig. 80 Fig. 25 Flow discharge and sediment load at Longmen station in 1977 [34] 1 Watershed Sediment Dynamics and Modeling 37 here. First, it is somewhat difficult to calibrate and verify the distributed parameters for such a large watershed. Second, the temporal and spatial resolutions of the rainfall data were not high enough. Sediment yield and transport on the Loess Plateau are not only related to the quantity of rainfall but also influenced by the intensity of rainfall. However, the rainfall input adopted in the simulation was in the format of daily rainfall.

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