River and Coastal Ocean Model (RiCOM) is a hydrodynamic model that is used to understand threats from coastal inundation events
The River and Coastal Ocean Model (RiCOM) is a numerical hydrodynamic model used to demonstrate near shore hydrologic conditions primarily surrounding water velocity and height.
The interactions of incoming waves/tsunamis with bathymetry, topography and the possible resulting inundation are the primary use of this model. This model has been used in the modelling of many locally sourced tsunami scenarios as well as far field scenarios.
RiCOM was developed by NIWA in an effort to build a framework that could effectively model the behaviour, effects and levels of inundation that coastal New Zealand could expect under different tsunami scenarios.
RiCOM operates as a coastal and inundation model within defined boundary conditions for the users chosen study area. RiCOM uses an unstructured, irregular triangular grid to define the study area with varying resolution; often lower resolution in Open Ocean and deeper water with increasing resolution the closer to shore where bathymetry and topography become more of an influence.
The model is based on a standard set of equations - the Reynolds-averaged NavierStokes equation (RANS) and the incompressibility condition.
Due to the models finite area of processing (output results are for a limited study area), RiCOM is generally used with a Far-field modelling counterpart such as Gerris which will model open ocean behaviour (Water Velocities and Height) up to RiCOM grid boundary points where this data will be used as inputs for RiCOM.
|State of Development||Unknown|
|Management Domains||Coastal, Freshwater|
|Intended End Users||
|Steady State or Dynamic||Unknown|
|Level of Integration||Environmental|
|Open/Closed Source||Closed Source|
|Operating Systems||MS Windows|
|Ease of Use||Unknown|
Lane, E.M.; Gillibrand, P.A.; Wang, X.; Power, W. (2012). A Probabilistic Tsunami Hazard Study of the Auckland Region, Part II: Inundation Modelling and Hazard Assessment. Pure and Applied Geophysics,
Walters, R.A. (2005). A semi‐implicit finite element model for non‐hydrostatic (dispersive) surface waves. International Journal for Numerical Methods in Fluid. 49: 721–737.
This case utilises the RiCOM model in conjunction with others to model near shore wave behaviour including inundation as a result of distal source tsunamis.
Probabilistic Hazard Analysis and Modelling of Tsunami Inundation for the Auckland Region from Regional Source Tsunami: Gillibrand, P., et. l. (2010). NIWA Client Report: CHC2010-102, GNS Consultancy Report 2010/200, Prepared for Auckland Council.
Wairakei/Te Tumu Tsunami Inundation Study: Walters, R., et. al. (2006). NIWA Client Report: CHC2006-020, Prepared for Bay of Plenty Regional Council