@article{fdi:010094853,
  title = {{S}easonal variations and drivers of water quality in semi-arid freshwater lakes : multivariate spatial analysis in {L}ake {G}uiers, {S}enegal},
  author = {{S}aadi, {H}. and {D}iongue, {D}. {M}. {L}. and {O}gilvie, {A}ndrew and {M}artin, {D}idier and {T}all, {O}. and {B}ellanger, {J}. and {N}diaye, {A}. and {F}aye, {S}.},
  editor = {},
  language = {{ENG}},
  abstract = {{S}tudy region: {L}ake {G}uiers, {S}enegal, {W}est {A}frica {S}tudy focus: {W}ater quality degradation from agriculture threatens freshwater lakes worldwide. {T}his study investigated the spatiotemporal hydrochemical dynamics of {L}ake {G}uiers, which supplies 50 % of {D}akar's drinking water, and examined natural and anthropogenic drivers of water mineralization. {T}he approach combined multivariate statistics, hydrogeochemical analysis ({P}iper, {G}ibbs), and {W}ater {Q}uality {I}ndex ({WQI}) assessments of samples collected over five seasonal campaigns (2022-2023) as well as hydroclimatic analysis. {S}easonal variations and spatial gradients of 22 parameters (physicochemical, major ions, biological, heavy metals) were explored to inform effective freshwater management strategies. {N}ew hydrological insights for the region: {M}ultidisciplinary approach highlights impact of intensified agriculture and inflows on spatiotemporal variations in water quality. {WQI} values categorized 67-87 % of samples as poor water quality, with conditions worsening during the rainy season. {S}everal parameters including heavy metals, cyanobacteria, chlorophyll-a and turbidity exceeded {WHO} standards. {T}emporal variations were influenced by evaporation during the dry season, agricultural discharge, and the combination of runoff and inflow waters during the rainy season. {S}ediment loaded inflow from the {T}aouey canal notably leads to greater turbidity and suspended particulate matter in the north of the lake, while runoff and associated mobility of nutrients favour cyanobacteria proliferation during the rainy season. {T}argeted interventions to reduce pollution sources and continuous monitoring of transitory drainage and runoff in selected hotspots are required to preserve this vital semi-arid freshwater lake.},
  keywords = {{W}est {A}frica ; {F}reshwater ; {W}ater quality ; {H}ydrochemistry ; {A}nthropogenic activities ; {SENEGAL} ; {ZONE} {SEMIARIDE} ; {GUIERS} {LAC}},
  booktitle = {},
  journal = {{J}ournal of {H}ydrology : {R}egional {S}tudies},
  volume = {61},
  numero = {},
  pages = {102695 [20 ]},
  year = {2025},
  DOI = {10.1016/j.ejrh.2025.102695},
  URL = {https://www.documentation.ird.fr/hor/fdi:010094853},
}