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

“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).

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.

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

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.

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.

The flexible boundary layer multi-level model Fbml_flow3 is a computational model that can change the number and height of boundary layers in the vertical direction, which has been fixed in the conventional planar two-dimensional multi-level models, as well as the gradient of the boundary layers.

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.

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.

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.

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。

GELATO(GEneralized LAgrangian Tracking with Optimization)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.