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

By Chih Ted Yang, Lawrence K. Wang

This publication, 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 delivery, reservoir sedimentation, and fluvial tactics, minimal strength dissipation price conception and purposes, hydraulic modeling improvement and alertness, geophysical tools for overview of earthen dams, soil erosion on upland parts through rainfall and overland move, geofluvial modeling methodologies and functions, and environmental water engineering glossary.

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26) where S and S0 sediment concentrations (kg/m3) S* and S0* sediment transport capacities of the outlet and inlet cross-sections (kg/m3) α coefficient of saturation recovery ωs settling velocity of the sediment particles (m/s). 5 Integration Based on Digital Drainage Network Formulations for natural processes of sediment yield and transport introduced above are coupled based on the digital drainage network in the DYRIM. During simulation, water yield and sediment erosion on hillslopes, gravitational erosion in gullies, and hyperconcentrated flow routing in channels are calculated separately for different hillslope-channel units.

Soil stress and geometry are time-variant with water content. Therefore, at different time steps, different assurance coefficients Fs = FR/FD will be obtained. However, in order to meet the randomicity of gravitational erosion, fuzzy analysis is adopted to gain the assurance coefficient, and finally, the membership grade of destabilization is achieved. Whether a random event happens or not is judged when the model is running. When failure is predicted to occur, the volume of failure block per unit reach length can be calculated from geometry.

Fig. 12 The forces on the sliding soil body [34] the slide-crack surface, and the reduction of cohesive strength caused by the increment of soil moisture is considered, and (3) water pressure ( T) in the tension crack along the loess vertical cleavage at the top of the soil body. To calculate the forces above, the infiltration can be obtained by the runoff yield simulation model of the system. 17) where c nominal total cohesive strength (Pa) c′ cohesive strength of the saturated soil (Pa) τ′ additional cohesive strength (Pa) σ normal stress (Pa) φ internal friction angle, which is assumed to be invariant with water content.

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