@article{fdi:010081251,
  title = {{A}long-stream variations in valley flank erosion rates measured using {B}e-10 concentrations in colluvial deposits from canyons in the {A}tacama {D}esert},
  author = {{Z}avala, {V}. and {C}arretier, {S}{\'e}bastien and {R}egard, {V}. and {B}onnet, {S}. and {R}iquelme, {R}. and {C}hoy, {S}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he widening and deepening of river valleys occur at different rates. {T}his co-evolution is largely undocumented over thousands of years. {U}ncertainties on incision and widening laws limit the ability of models to reproduce erosion rates and responses to tectonics and climate over geologic timescales. {W}e studied two 1 km-deep canyons in northern {C}hile, both characterized by valley widening after the upward migration of a major knickzone but with a diachronous incision initiation. {W}e use {B}e-10 concentrations measured in colluvial deposits to quantify the erosion rates {E} of along-stream valley flanks. {W}e observe that {E} increases in the knickzone, with well-defined relationships ({R}2 = 0.7): {E} increases quasilinearly with the valley-bed slope and decreases with the valley width (exponent similar to-0.4). {O}ur results suggest that {E} decreases with time but that valley flank weathering may sustain a significant lateral erosion rate. {O}ur results provide data for testing erosion laws governing valley widening.},
  keywords = {{A}ndes ; {A}tacama ; cosmogenic ; valley widening ; {CHILI} ; {ANDES} ; {ATACAMA}},
  booktitle = {},
  journal = {{G}eophysical {R}esearch {L}etters},
  volume = {48},
  numero = {5},
  pages = {e2020{GL}089961 [11 ]},
  ISSN = {0094-8276},
  year = {2021},
  DOI = {10.1029/2020gl089961},
  URL = {https://www.documentation.ird.fr/hor/fdi:010081251},
}