@article{fdi:010082097,
  title = {{B}iogeochemical functioning of an urbanized tropical estuary : implementing the generic {C}-{GEM} (reactive transport) model},
  author = {{N}guyen, {A}. {T}. and {N}emery, {J}. and {G}ratiot, {N}icolas and {G}arnier, {J}. and {D}ao, {T}. {S}. and {T}hieu, {V}. and {L}aruelle, {G}. {G}.},
  editor = {},
  language = {{ENG}},
  abstract = {{E}stuaries are amongst the most productive ecosystems of the land ocean continuum, but they are also under high anthropic pressures due to coastal urbanization. {T}oo sparse observations have hindered the understanding of complex interactions between water quality and estuarine hydrodynamics and biogeochemical transformations. {U}ntil now, estuarine modelling studies have mainly focused on temperate estuarine systems in industrialized countries. {T}his study investigates the responses of a tropical estuary to pollution load from a megacity ({H}o {C}hi {M}inh {C}ity, {S}outhern {V}ietnam) by applying a one-dimensional, biogeochemical estuarine model ({C}-{GEM}). {T}he {S}aigon {R}iver {E}stuary flows through the megacity of {H}o {C}hi {M}inh ({HCMC}) and is subject to episodic hypoxia events due to wastewater inputs from urban discharges. {G}ood agreements are found between simulation outputs and observations for tidal propagation, salinity, total suspended sediment, and water quality variables in dry season in {S}aigon {R}iver {E}stuary. {C}-{GEM} reproduces the increases in ammonium, total organic carbon, phytoplankton and dissolved oxygen depletion in the urban section of the {S}aigon {R}iver as an impact of untreated wastewaters from {HCMC}. {T}he steady-state version of {C}-{GEM} also reveals the formation of a pollutant cloud (30-km stretch) resulting from the combined effects of tidal fluctuation and low flushing capacity during the dry season. {F}urthermore, the quantification of the reaction fluxes simulated by the model demonstrates that nitrification is the main process removing {NH}4+ from the {S}aigon {R}iver. {F}or the first time in such a type of environment, our study demonstrates the effectiveness of {C}-{GEM} at unraveling the complex interplay between biogeochemical reactions and transport in a tropical estuary with a minimized data requirement. {T}his is significant for tropical estuaries in developing countries, where intensive monitoring programs are rare and have thus been rarely the object of modelling investigations.},
  keywords = {{B}iogeochemical modelling ; {S}elf-purification ; {S}aigon {R}iver {E}stuary ; {H}o {C}hi {M}inh megacity ; {V}ietnam ; {VIET} {NAM} ; {HO} {CHI} {MINH} {VILLE} ; {ZONE} {TROPICALE} ; {SAIGON}  ; {COURS} {D}'{EAU}},
  booktitle = {},
  journal = {{S}cience of the {T}otal {E}nvironment},
  volume = {784},
  numero = {},
  pages = {147261 [14 ]},
  ISSN = {0048-9697},
  year = {2021},
  DOI = {10.1016/j.scitotenv.2021.147261},
  URL = {https://www.documentation.ird.fr/hor/fdi:010082097},
}