Wave Attenuation Service by Intertidal Coastal Ecogeosystems in the Bay of Mont-Saint-Michel, France: Review and Meta-Analysis

The wave attenuation service (WAS) literature review over the Bay of Mont-Saint-Michel encompasses saltmarshes, mudflats, seagrasses, shelly cheniers, oyster, honeycomb worm and sandworm reefs, which all together will be named “ecogeosystems” in this review due to their combination of biogenic systems, ecological systems and geomorphological systems (Mury et al. in Geophys Res Abstr 20:2044, 2018). It provides a comparative meta-analysis of the various measurements of wave attenuation induced by “ecogeosystems” across different studies focusing on wave height monitoring. The array of “ecogeosystems” included in this review was firstly identified through a fine-scale mapping of the Bay of Mont-Saint-Michel, then literature research was led using several keywords related to ecosystem services and coastal protection. A total of 32 studies was compiled over six countries. The majority of studies was located on North-Atlantic Ocean coastlines. According to their specificities, “ecogeosystems” were synthetically split into two categories, surface (saltmarshes, mudflats, seagrasses and oyster reefs) and punctual (shelly cheniers), for the sake of the WAS comparability. WAS associated with surface saltmarshes, mudflats, seagrasses, and oyster reefs ranged from 0.25 to 7.86%/m, from 0.01 to 4%/m, from 0.03 to 0.77%/m, from 1 to 64%/m, respectively. The punctual shelly chenier was monitored from 70 to 98%. Honeycomb worm and sandworm reefs have no data about WAS according to our literature review.