@article{fdi:010076116,
  title = {{E}xceptional rates and mechanisms of muddy shoreline retreat following mangrove removal},
  author = {{B}runier, {G}. and {A}nthony, {E}. {J}. and {G}ratiot, {N}icolas and {G}ardel, {A}.},
  editor = {},
  language = {{ENG}},
  abstract = {{P}robably the largest regular shoreline fluctuations on {E}arth occur along the 1500 km-long wave-exposed {G}uianas coast of {S}outh {A}merica between the mouths of the {A}mazon and {O}rinoco {R}ivers, the world's longest muddy coast. {T}he {G}uianas coast is influenced by a succession of mud banks migrating northwestward from the {A}mazon. {M}igrating mud banks dissipate waves, partially weld onshore, and lead to coastal progradation, aided by large-scale colonization by mangroves, whereas mangrove-colonized areas between banks (inter-bank areas) are exposed to strong wave action and undergo erosion. {O}n large tracts of this coast, urbanization and farming have led to fragmentation and removal of mangroves, resulting in aggravated shoreline retreat. {T}o highlight this situation, we determined, in a setting where mangroves and backshore freshwater marshes have been converted into rice polders in {F}rench {G}uiana, shoreline change over 38 years (1976-2014) from satellite images and aerial orthophotographs. {W}e also conducted four field experiments between {O}ctober 2013 and {O}ctober 2014, comprising topographic and hydrodynamic measurements, to determine mechanisms of retreat. {T}he polder showed persistent retreat, at peak rates of up to -200 m/yr, and no recovery over the 38-year period of monitored change. {N}otwithstanding high erosion rates, mangrove shorelines show strong resilience, with recovery characterized by massive accretion. {R}etreat of the polder results in a steep wave-reworked shoreface with a lowered capacity for bank welding onshore and mangrove establishment. {P}ersistent polder erosion is accompanied by the formation of a sandy chenier that retreats landwards at rates largely exceeding those in inter-bank situations. {T}hese results show that anthropogenic mangrove removal can durably modify the morphodynamics of muddy shorefaces. {T}his limits the capacity for shoreline recovery and mangrove re-establishment even when there is no sustained long-term deficit in mud supply, as in the case of the {A}mazon-influenced {G}uianas coast.},
  keywords = {{M}angrove protection ; mangrove removal ; coastal erosion ; {A}mazon-influenced muddy coast ; mud banks ; cheniers ; {GUYANE} {FRANCAISE} ; {AMAZONE} {DELTA}},
  booktitle = {},
  journal = {{E}arth {S}urface {P}rocesses and {L}andforms},
  volume = {44},
  numero = {8},
  pages = {1559--1571},
  ISSN = {0197-9337},
  year = {2019},
  DOI = {10.1002/esp.4593},
  URL = {https://www.documentation.ird.fr/hor/fdi:010076116},
}