@article{fdi:010048801, title = {{S}ignificant contribution of the 18.6 year tidal cycle to regional coastal changes}, author = {{G}ratiot, {N}icolas and {A}nthony, {E}. {J}. and {G}ardel, {A}. and {G}aucherel, {C}. and {P}roisy, {C}hristophe and {W}ells, {J}. {T}.}, editor = {}, language = {{ENG}}, abstract = {{A}lthough rising global sea levels will affect the shape of coastlines over the coming decades(1,2), the most severe and catastrophic shoreline changes occur as a consequence of local and regional-scale processes. {C}hanges in sediment supply(3) and deltaic subsidence(4,5), both natural or anthropogenic, and the occurrences of tropical cyclones(4,5) and tsunamis(6) have been shown to be the leading controls on coastal erosion. {H}ere, we use satellite images of {S}outh {A}merican mangrove-colonized mud banks collected over the past twenty years to reconstruct changes in the extent of the shoreline between the {A}mazon and {O}rinoco rivers. {T}he observed timing of the redistribution of sediment and migration of the mud banks along the 1,500km muddy coast suggests the dominant control of ocean forcing by the 18.6 year nodal tidal cycle(7). {O}ther factors affecting sea level such as global warming or {E}l {N}ino and {L}a {N}ina events show only secondary influences on the recorded changes. {I}n the coming decade, the 18.6 year cycle will result in an increase of mean high water levels of 6 cm along the coast of {F}rench {G}uiana, which will lead to a 90 m shoreline retreat.}, keywords = {}, booktitle = {}, journal = {{N}ature {G}eoscience}, volume = {1}, numero = {3}, pages = {169--172 + 6 p. h.t.}, ISSN = {1752-0894}, year = {2008}, DOI = {10.1038/ngeo127}, URL = {https://www.documentation.ird.fr/hor/fdi:010048801}, }