By Chih Ted Yang, Lawrence K. Wang
This booklet, Advances in Water assets Engineering, quantity 14, covers the subjects 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 strength dissipation fee thought and purposes, hydraulic modeling improvement and alertness, geophysical equipment for review of earthen dams, soil erosion on upland components via rainfall and overland circulate, geofluvial modeling methodologies and functions, and environmental water engineering glossary.
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Topography information, land use, soil type, and model parameters) needed for commencing the simulation and the final simulation results exported by all kinds of physically based models; the master node is in charge of the domain decomposition of drainage network and tasks allocation; the slave node runs physically based models for the tasks accepted from the master node; and the transfer node is responsible for the communication processes among the slave nodes. For the dynamic parallelization of hydrological simulations, the decomposition of a watershed into a large number of sub-watersheds is necessary.
Various geometrical parameters, such 1 Watershed Sediment Dynamics and Modeling 7 Fig. 2 The flowchart of digital drainage network extraction as channel density, gradient of hillslopes, length, and gradient of channel segments, can be extracted and used to provide the basic data for physically based models. To obtain digital drainage networks from the DEM, a D8-based algorithm  with optimized data sorting and RAM operation was developed by Bai et al. 2): (1) flow direction determination, (2) accumulation and channel identification, (3) vectorization, and (4) topologization.
Remote sensing (RS) and geographical information system (GIS)—interacting processes in the watersheds are expected to be delineated and simulated digitally. In recent years, great efforts have been made by many researchers in China to develop physically based erosion models applicable to the Loess Plateau [2, 3, 7, 12, 14, 18, 22, 23, 32]. In these models, each watershed unit is divided into several geomorphic units from the top to the bottom of the hillslopes; then for each geomorphic unit, a different erosion module is used according to the physical processes.