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Solvers

Nays2DH

Nays2DH is a computational model for simulating horizontal two-dimensional (2D) flow, sediment transport, morphological changes of bed and banks in rivers.

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FaSTMECH

“FaSTMECH (Flow and Sediment Transport with Morphological Evolution of Channels)” is a river flow / riverbed variation analysis solver developed by Dr. Jonathan Nelson of the U.S. Geological Survey (USGS).

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NaysDw2

NaysDw2 is a solver in iRIC for tracking driftwoods using material tracking functions of UTT. The method used in NaysDw2 is the same as UTT which is the Lagrangian method of tracing materials. NaysDw2 also has a function of hitting and rotating materials to each other as the DEM method.

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Nays2d+

Nays2d+ is a quasi 3-dimensional open channel flow solver, which combines the results of a horizontal 2-dimensional shallow water flow model and a theoretical solution of velocity profiles of the main flow and secondary flow profiles in the vertical direction. The results of the flow solution of Nays2dh in iRIC are used for the basic 2-dimensional flow field, and the theory proposed by Engelund(1974) 1) is superimposed over the 2-dimensional solution.

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NaysCUBE

The basic equations of three-dimensional flow that incorporate the dynamic water pressure. This solver can simulate the fully three-dimensional flow phenomena, such as, the secondary current of the first kind, the horseshoe vortex around river structures, etc., and associated bed morphodynamic features. So, this solver can cover wider range of phenomena compared with 2D models, although it requires one-order (or more) larger CPU time. Therefore, this solver is suitable to be applied not on wide region of a river but on a limited portion for detailed analysis. The right figure shows an example for simulated the secondary flow of the first kind at a river bend.

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ELIMO

iRIC-ELIMO has been developed with a motto of ”simple and easy tsunami computation” for people with minimum knowledge to operate Window softwares, which is capable of reliable estimations of tsunami generation, propagation and evolution on coasts on easy-performable GUI environment provided by iRIC.

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Morpho2DH

Morpho2DH is the horizontal two dimensional debris/mud flow analysis solver which can reproduce the transport and deposition process of debris/mud flow due to the landslides. Structures (ex. sabo dam, weir, house and so on) and horizontal distribution of erosion depth can be considered in the analysis.

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UTT

UTT(Universal Tracer Tracker) is a tool to track and visualize the trajectory of various materials specified by the user using the calculation result of various flow calculation solvers implemented in iRIC. The target transported substance is not only completely following the flow, but also the substance itself has a cruising ability, a typical example is a fish, by specifying its ability and characteristics to express its movement.

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SRM

The Storage Routing Model (SRM) solver is a runoff calculation solver that uses storage routing models. The models had been developed by Dr. Kiyoshi Hoshi, former Director General of the Hokkaido Civil Engineering Institute (the current Civil Engineering Research Institute for Cold Region, Public Works Research Institute) and former Research Director of the Research Institute of the Foundation of Hokkaido River Disaster Prevention Research Center (the current River Center of Hokkaido). The model has been improved to apply to a solver for iRIC by Dr. Makoto Nakatsugawa of Muroran Institute of Technology, Dr. Tomohide Usutani of Japan Weather Association and Terumasa Nishihara of Civil Engineering Research Institute for cold region. The solver consists of two types of storage routing models: a synthetic storage routing model and a two-cascade storage routing model. The solver is equipped with two functions: One can calculate runoff amount from rainfall, while another can optimize parameters of the storage routing model. Using the iRIC GUI, you can calculate the runoff by applying rainfall data (or rainfall and discharge data) to this solver.

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Nays3dv

Nays3DV is 3Dimensional model developed for calculation of vertical and horizontal movement of fluid with density currents. The Nays3DV solver is developed by Professor Yasuyuki Shimizu from Hokkaido University. Density currents occured due to density differences, arise from temperature variations, suspended solids or dissolved materials. Therefore, formation and evolution of density currents are induced by natural conditions such as saline intrusions, oil spills etc. Density flow is important for problems in lakes, reservoirs and estuaries.

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Nays2DFlood

Nays 2D Flood is a flood flow analysis solver that relies on unsteady 2-dimensional plane flow simulation using boundary-fitted coordinates1 as the general curvilinear coordinates. This solver adopts the 2-dimensional plane flow simulation of the Nays2D Solver developed by Professor Yasuyuki Shimizu of Hokkaido University for flood flow analysis.

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CERI1D

CERI1D is a solver for one-dimensional (1D) unsteady flow calculation. The calculation model was developed by Yasuhiro Yoshikawa of the Civil Engineering Research Institute for Cold Region (at Kitami Institute of Technology as of November 2012), and the model was improved to create a solver for iRIC by Takuya Inoue from the Institute and Michihiro Hamaki from Kaihatsu Koei Co., Ltd.

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