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Solvers

Culvert Analysis Program (CAP)

U.S. Geological Survey Culvert Analysis Program (CAP)

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Slope Area Computation (SAC)

SAC can be used to compute peak flood discharges from measurements of high-water marks along a stream reach. The slope-area method used by the program is based on the U.S. Geological Survey (USGS) procedure presented in Techniques of Water Resources Investigations of the U.S. Geological Survey, book 3, chapter A2, "Measurement of Peak Discharge by the Slope-Area Method".

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Mflow_02

Mflow_02 is an analysis solver to calculate two-dimensional plane unsteady flow and riverbed variation by unstructured meshes of finite element method in orthogonal coordinate system (Cartesian coordinate system). The original version of Mflow_02 was based on programdeveloped in late 1980s by G. Tomitokoro of Shinshu University. Thereafter, M. Gamou (former staff of Pacific Consultants Co. Ltd, current Gamou Intelligent Technology Co. Ltd. (G.I.T.)), K. Hamaguchi and M. Ichiyama(Pacific Consultants Co. Ltd) led the core work to expand and develop the model, firstly added some functions like moving boundary model and riverbed variation calculation, etc.. It has been registered as a calculation solver for iRIC Version2.3 in (July) 2014.

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River2D

River2D is a two dimensional depth averaged finite element hydrodynamic model that has been customized for fish habitat evaluation studies.

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NaysEddy

In river engineering problems, the flow cannot always be approximated by two-dimensional models.

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DHABSIM

DHABSIM (Diversity based HABitat SIMulation) is an easy-to-use two-dimensional habitat calculator. It can calculate habitat condition of mid to small scale river without using HSI for specific fish species. It imports geometry, velocity, and depth from other flow calculation solvers, and outputs a habitat distribution map.

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EvaTRiP

EvaTRiP(Evaluation Tools for River environmental Planning)は、主に中小河川の河道計画・設計における河道の安定性、河川の環境や維持管理に関する検討に利用することを目的として開発されたツールです。

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Nays2Dv

Nays2DV is a computational model for simulating two dimensional vertical plane flow. Model was developed for calculation of vertical movement of fluid (density flow). The Nays2DV solver is developed by Professor Yasuyuki Shimizu from Hokkaido University. When the density of a fluid changes due to temperature or turbidity, a buoyancy force occurs due to the density difference with the surrounding fluid and this buoyancy force induces a flow. This is called density flow. Density flow is important in problems in lakes, reservoirs and estuaries.

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SToRM

SToRM (System for Transport and River Modeling) is a horizontal two-dimensional flow analysis solver developed by the U.S. Geological Survey. Because SToRM employs unstructured grids in its lattice system, it can provide suitable analysis even under complex boundary conditions. Conditions such as simultaneous regular and jet flow mixed flows or waterfront boundaries can be handled.

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Nays1D+

Nays1D+ is a one-dimensional solver for rivers with general cross-sectional shape. This solver can calculate flows by non-uniform steady flow model as well as unsteady flow model. The solver also calculate bed deformation considering bedload. The obstacles such as bridge pier and spur-dikes, inflow from tributaries can be also considered in the computaions. You can visualize the results using two-dimensional visualization window equiped in iRIC with the methods of color contour, vectors, particl trace, ets.

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