Work Description

Title: Effective Fetch and Relative Exposure Index Maps for the Laurentian Great Lakes Open Access Deposited

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  • See Scientific Data publication.
  • Wind exposure is a key physical driver of coastal systems in aquatic environments influencing circulation and wave dynamics. A measure of wind exposure is fetch, the distance over which wind can travel across open water. In large lake systems, such as the Laurentian Great Lakes, estimating fetch has proved to be difficult due to their vast size and complex topobathymetry. Here we describe the development of two spatially discrete indicators of exposure to provide a more accurate indicator of influence of wind exposure in the nearshore of the Laurentian Great Lakes. We summarized wind data from offshore buoys and leveraged existing tools to calculate effective fetch and relative exposure index (effective fetch scaled by mean wind speed) at a 30 m grid cell resolution. We validated these models by comparing our exposure maps to the U.S. Army Corps of Engineers Wave Information Studies models and found general agreement. These exposure maps are available for public download for the years 2004-2014.
Contact information
Funding agency
  • Other Funding Agency
Other Funding agency
  • Great Lakes Fishery Trust (22016.1678)
Resource type
Last modified
  • 04/22/2020
  • 03/30/2018
To Cite this Work:
Mason, L. A., Riseng, C. M., Layman, A. J., Jensen, R. (2018). Effective Fetch and Relative Exposure Index Maps for the Laurentian Great Lakes [Data set], University of Michigan - Deep Blue Data.


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Files (Count: 11; Size: 14.1 GB)

Author : Lacey Mason,
Affilliation : University of Michigan
School for Environment and Sustainability

Title : Effective fetch and relative exposure index maps for
the Laurentian Great Lakes

Contents of the Data File :
1. Data Citation & Reference
2. License
3. Example wind summary table
4. Python files
5. EF & REI data
6. Offshore mask

Data Citation & Reference

XXX Scientific Data reference and data citation here XXX

See the Creative Commons license listed here:
---Deep Blue link---

Example wind summary table

The file "LSC_c45147_2014_fetchDir_36bins.csv is an example wind summary table based on data from the offshore buoy c45147 in Lake St. Clair for the open water season of 2014. An explanation of how the data was summarized can be found in the above referenced manuscript.

Python files

The Python files "" and "" were used to weight the fetch rasters produced using the tool from Rohweder et al. (2012; and create a composite map of each Great Lake.

EF & REI data

The final effective fetch (EF) and relative exposure index (REI) data can be found in zip files are organized by lake; Erie, Huron, Michigan, Ontario, St. Clair, and Superior. The files are in GeoTIFF format.

Offshore mask

The file "" is a GeoTIFF file to mask the offshore areas where the EF and REI data sets are not relevant. The offshore mask covers the areas of the Great Lakes greater than 30 m in depth, except for Lake Erie which is greater than 15 m in depth.

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