Tool name * WEMo

WEMo (Wave Exposure Model) is a simple hydrodynamic model that calculates the wind wave exposure of a site (Murphey and Fonseca 1995, Fonseca and Bell 1998). WEMo helps coastal managers and ecologists with tasks of estimate wave parameters in coastal and estuarine environments since hydrodynamic factors can profoundly impact the environment in coastal areas. This involves estimating the wave energy reaching the shoreline taking into account the effects of wind, local topography and bottom. WEMo was designed to bridge the gap between ecologists and managers on one hand, and physical hydrologists on the other by providing a user-friendly access to quantitative forecasts of wave energy in estuarine environments. WEMo has two distinct modes: Representative Wave Energy or RWE mode and Relative wave Exposure Index or REI mode uses different approach to calculate wave exposure. RWE mode is based on linear wave theory and is implemented with a wave ray technique in a monochromatic approach. REI mode on other hand uses an empirical approach based on inverse-distance -weighting function (IDW) of bottom depth applied to wave rays (Murphey and Fonseca 1995). Selection of WEMo mode depends on the project requirement, geographical area for the study and time scale used in the study. Tech support available User manual, available for consultation Equipment Needs MS Windows and ArcGIS ArcView 9.2 license (from:

Category All, Data, Impact Assessment, Numerical Model, Spatial Analysis
What step(s) in analysis framework 2a, 3
What step(s) in Governance framework

Minimum Hardware Requirements1 GHz (1.5 GHz or above recommended) 512 MB RAM (512 MB or above recommended) 1 GB disk space required to install and effectively run the application Software RequirementsArcView 9.2 and 9.3 network or single-user license ArcInfo or ArcEditor license required for creating some data setsOperates in Windows XP and Vista environmentsData RequirementsBathymetry grid data from the NOAA National Geophysical Data CenterShoreline coverage from a collection of NOAA and USGS data sets for estuaries and bays Both shoreline coverage and bathymetry grid must be projected in the same coordinate system, such as Universal Transverse Mercator (UTM) or State Plane, and not in a geographic coordinate system. Both must also have the same geographic footprint.Website for UTM zonesWind data from the NOAA National Data Buoy Center

Data Quality Required


Modification Required

Probably, either to the model to accept European datasets or to European datasets to match with the models requirements.

Expertise Required


Spatial and Temporal



Tables and images (maps?) of calculated results

License cost issues



Literature: References & Manuals *

Wave Exposure Model (WEMo) Manual Wave Exposure Model (WEMo) Frequently Asked Questions WEMo Technical Memo: Formulation, Procedures, and Validation Details the working of the model in two modes—Representative Wave Energy and Relative Exposure Index—and validates the model against the observation data collected near Harkers Island, North Carolina. (available at: