Download e-book for kindle: Advances in Water Resources Engineering by Chih Ted Yang, Lawrence K. Wang

Environmental Studies

By Chih Ted Yang, Lawrence K. Wang

This ebook, 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 tactics, minimal strength dissipation expense concept and functions, hydraulic modeling improvement and alertness, geophysical tools for review of earthen dams, soil erosion on upland parts through rainfall and overland stream, geofluvial modeling methodologies and functions, and environmental water engineering glossary.

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12) where ρm density of the sediment-laden flow (kg/m3). 11), we get  β  rm  53 β 53 β 107 β − β mx D = k  qx n J D . 14) Surface runoff is assumed to be generated uniformly in a hillslope so that qx = qex, where qe is the surface runoff rate (m/s). 15) In the area of a hillslope, the characteristics of soil and microtopography basically do not vary largely, thus the parameters k and β can be assumed constant with x. Moreover, ρm increases from the top to the bottom in a hillslope, and is determined by ex.

Wang et al. 41 NSE Nash–Sutcliffe coefficient of efficiency With the parameters determined by model calibration, the other three rainfall events are simulated by using the DYRIM. 22. 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.

Fig. 6 The flowchart for a dynamic watershed decomposition [19] erosion process affected by hydrodynamic forces. , landslides and collapses). The steep slope and the characteristics of loess soil are the main factors leading to gravitational erosion, while rainfall and runoff also play an important role in inducing the occurrence of gravitational erosion. Among all the main factors, the nature of the soil and micro-landscape are random, which ultimately makes gravitational erosion a stochastic process, which can be triggered by specific factors.

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