@article{fdi:010075235,
  title = {{N}utrient dynamics and eutrophication assessment in the tropical river system of {S}aigon - {D}ongnai (southern {V}ietnam)},
  author = {{N}guyen, {T}. {T}. {N}. and {N}emery, {J}. and {G}ratiot, {N}icolas and {S}trady, {E}milie and {T}ran, {V}. {Q}. and {N}guyen, {A}. {T}. and {A}ime, {J}oanne and {P}eyne, {A}.},
  editor = {},
  language = {{ENG}},
  abstract = {{S}aigon-{D}ongnai {R}ivers in {S}outhern {V}ietnam is a complex lowland hydrological network of tributaries that is strongly influenced by the tidal cycles. {T}he increasing economic, industrial and domestic developments in and around {H}o {C}hi{M}inh {C}ity ({HCMC}) have led to serious impacts on water quality due to lack of appropriate wastewaters treatment. {D}rinkingwater production is impacted and the large aquaculture production areas may also be affected. {W}e analyzed spatial and seasonal variability of nutrient concentrations ({P}hosphorus, {N}itrogen and {S}ilica) and eutrophication indicators ({O}rganic {C}arbon, {C}hlorophyll-a and {D}issolved {O}xygen) based on bi-monthly monitoring during two hydrological cycles ({J}uly 2015-{D}ecember 2017). {F}our monitoring sites were selected to assess the impact of {HCMC}: two upstream stations on the {S}aigon {R}iver and {D}ongnai {R}iver branches to provide the reference water quality status before reaching the urbanized area of {HCMC}; one monitoring station in the city center to highlight {S}aigon {R}iver water quality within the heart of the megacity; the fourth station downstream of the confluence to evaluate the impact of {HCMC} on the estuarine waters. {T}his study points to excess nutrients in {HCMC}'s water body with concentrations of {NH}4+ and {PO}43- averaging to 0.7 +/- 0.6 mg{N} {L}-1 and 0.07 +/- 0.06 mg{P} {L}-1, respectively in mean over the monitored period and rising up to 3 mg{N} {L}-1 and 0.2 mg{P} {L}-1, in extreme conditions. {D}uring the dry season, we evidenced that untreated domestic discharges leads to degradation of the {S}aigon {R}iver's water quality with extreme values of algal biomass (up 150 mu {C}hl-a {L}-1) and hypoxic conditions occurring episodically ({DO} < 2 mg {L}`(-1)) in the heart of the megacity. {U}ntil now, eutrophication in the urban center has had no clear effect downstream because eutrophicwater mass from the {S}aigon {R}iver is efficiently mixed with the {D}ongnai {R}iver and sea water masses during the successive semi-diurnal tidal cycles.},
  keywords = {{W}ater quality ; {N}utrients ; {M}egacity ; {E}utrophication ; {T}idal river ; {VIET} {NAM} ; {ZONE} {TROPICALE} ; {SAIGON} {COURS} {D}'{EAU} ; {DONGNAI} {COURS} {D}'{EAU}},
  booktitle = {},
  journal = {{S}cience of the {T}otal {E}nvironment},
  volume = {653},
  numero = {},
  pages = {370--383},
  ISSN = {0048-9697},
  year = {2019},
  DOI = {10.1016/j.scitotenv.2018.10.319},
  URL = {https://www.documentation.ird.fr/hor/fdi:010075235},
}