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Seasonal Impact of a Mega-Drought (2010-2015) on the Water Quality of Biobío River, Central Chile

This study analyzes the impact of a long-lasting drought on the water quality of Biobío River in Central Chile. Trend analysis and sensitivity analysis were performed to determine the changes in hydroclimatic parameters and water quality during the megadrought period.

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Seasonal Impact of a Mega-Drought (2010-2015) on the Water Quality of Biobío River, Central Chile

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  1. Seasonalimpact of a mega-drought (2010-2015) onthewaterquality of Biobío river, Central Chile Mariela Yevenes1,2, Ricardo Figueroa3, Oscar Parra3, Laura Farías1,2 1Departamento de Oceanografía, Universidad de Concepción 2Centro del Clima y la Resiliencia CR2 3Facultad de Ciencias Ambientales, Universidad de Concepción CONICYT/FONDAP/15110009 http://www.cr2.cl/ @CR2_uchile

  2. Introducción • Waterresources are underpressurefrommultiplestresorssuch as climatechange(droughts), agriculture and waterabstraction. • Prolongateddroughtfrom 2010 to date in Central Chile: Megadrought (Garreaud et al. 2017)

  3. Megadroughteffects (2010-2015) thataffectondifferentresources waterquality Objetive: Weperform a Trendanalysis of recenttrends in hidroclimaticparameters and waterquality in a Central Chile watershed, Biobioriverwatershed. Downstream Upstream Watershedarea 24.262 km² Mediterraneanclimate Averagedischarge 900 m3 s-1 Snow melt-precipitation

  4. Metodology • Baseline (2000-2014of sixlocationsfor 17 parameters. Centro EULA-Universidad de Concepción and Dirección General de Aguas (DGA)

  5. Results: Mann Kendall, seasonal Mann Kendall, Biobioupstream

  6. Results: scaling(MDS)

  7. Results: Mann Kendall, seasonal Mann Kendall, Biobiodownstream 2000-2009 2010-2015

  8. Mann Kendall Trends • DifferencesbetweenTºC, nutrients and travemetalsupstream. • Downstream, Nutrients and pH decrasedconsiderablywithnegativetrends. • Positive trendswererecordedforTemperatureand trace metalslike Pb, Fe, Cr y Co.

  9. Senslope (trendanalysis) Positive trend inblue Negativetrend in green Quantification of Senslopeshowed suspended solid and trace metals.

  10. Discussion and Conclusion • Waterqualitygenerate multidimensional data thatneedsto be studiedstatisticallytoanalyze and interprettheunderlyinginformation. • Trendanalysiswiththe Mann-Kendall test and Senslopeshowed a greaterreduction in nutrientconcentrations, mainlyassociatedwithdecreasedflowmainly in autumnsand summers. • Thelowflowratesassociatedwithdroughtaffectwaterqualitydecreasing pH and suspended solids, nutrients, and increasingtrace metals, sincethe metal dilutioncapacityisreduced. • Thedecrease in waterqualityduringsummerdroughtperiodisrelatedtothehightemperaturesboththewater and thelowerdischarge (lowerdilution of thechemical load of thepointsources).

  11. ¡Gracias!

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