Barthel, Matti

Bodé, Samuel

Boeckx, Pascal

Goethals, Peter

Ho, Long Tuan

Jerves Cobo, Rubén

Six, Johan

English

Rivers act as a natural source of greenhouse gases (GHGs) that can be released from the metabolisms of aquatic organisms. Anthropogenic activities can largely alter the chemical composition and microbial communities of rivers, consequently affecting their GHG emissions. To investigate these impacts, we assessed the emissions of CO2, CH4, and N2O from Cuenca urban river system (Ecuador). High variation of the emissions was found among river tributaries that mainly depended on water quality and neighboring landscapes. By using Prati and Oregon Indexes, a clear pattern was observed between water quality and GHG emissions in which the more polluted the sites were, the higher were their emissions. When river water quality deteriorated from acceptable to very heavily polluted, their global warming potential (GWP) increased by ten times. Compared to the average estimated emissions from global streams, rivers with polluted water released almost double the estimated GWP while the proportion increased to ten times for very heavily polluted rivers. Conversely, the GWP of good-water-quality rivers was half of the estimated GWP. Furthermore, surrounding land-use types, i.e. urban, roads, and agriculture, significantly affected the river emissions. The GWP of the sites close to urban areas was four time higher than the GWP of the nature sites while this proportion for the sites close to roads or agricultural areas was triple and double, respectively. Lastly, by applying random forests, we identified dissolved oxygen, ammonium, and flow characteristics as the main important factors to the emissions. Conversely, low impact of organic matter and nitrate concentration suggested a higher role of nitrification than denitrification in producing N2O. These results highlighted the impacts of land-use types on the river emissions via water contamination by sewage discharges and surface runoff. Hence, to estimate of the emissions from global streams, both their quantity and water quality should be included

Ghent University Academic Bibliography

/Your Abstract Submission Has Been ReceivedClick here  to print this page now.You have submitted the following abstract to AGU Fall Meeting 2020. Receipt of this notice does not guarantee thatyour submission was free of errors.Effects of land use and water quality on greenhouse gas emissions from an urban river systemLong Ho , Ruben Jerves-Cobo , Matti Barthel , Johan Six , Pascal F M Boeckx , Samuel Bode  and PeterGoethals , (1)Ghent University, Gent, Belgium, (2)Universidad de Cuenca, PROMAS, Cuenca, Ecuador, (3)ETHZurich, Department of Environmental System`s Science, Zurich, Switzerland, (4)Ghent University, Ghent,Belgium, (5)Ghent University, Department of Green Chemistry and Technology, Gent, BelgiumAbstract Text:Rivers act as a natural source of greenhouse gases (GHGs) that can be released from the metabolismsof aquatic organisms. Anthropogenic activities can largely alter the chemical composition and microbialcommunities of rivers, consequently affecting their GHG emissions. To investigate these impacts, weassessed the emissions of CO , CH , and N O from Cuenca urban river system (Ecuador). High variationof the emissions was found among river tributaries that mainly depended on water quality andneighboring landscapes. By using Prati and Oregon Indexes, a clear pattern was observed between waterquality and GHG emissions in which the more polluted the sites were, the higher were their emissions.When river water quality deteriorated from acceptable to very heavily polluted, their global warmingpotential (GWP) increased by ten times. Compared to the average estimated emissions from globalstreams, rivers with polluted water released almost double the estimated GWP while the proportionincreased to ten times for very heavily polluted rivers. Conversely, the GWP of good-water-quality riverswas half of the estimated GWP. Furthermore, surrounding land-use types, i.e. urban, roads, andagriculture, signi cantly affected the river emissions. The GWP of the sites close to urban areas wasfour time higher than the GWP of the nature sites while this proportion for the sites close to roads oragricultural areas was triple and double, respectively. Lastly, by applying random forests, we identi eddissolved oxygen, ammonium, and  ow characteristics as the main important factors to the emissions.Conversely, low impact of organic matter and nitrate concentration suggested a higher role ofnitri cation than denitri cation in producing N O. These results highlighted the impacts of land-usetypes on the river emissions via water contamination by sewage discharges and surface runoff. Hence,to estimate of the emissions from global streams, both their quantity and water quality should beincluded.1 2 3 3 4 512 4 2 2/First Presenting AuthorPresenting AuthorLong HoPrimary Email: long.tuanho@UGent.beA liation(s):Ghent University Gent 9000 (Belgium)Plain-Language Summary:Rivers are being polluted by human activities, especially in populated urban areas. Our studiesinvestigate the impacts of these activities on greenhouse gas (GHG) emissions from an urban riversystem. The results showed a clear trend between water quality and GHG emissions in which the morepolluted the sites were, the higher were their emissions. Speci cally, when river water qualitydeteriorated from acceptable to very heavily polluted, their contribution to global warming increased byten times. Conversely, good-water-quality rivers contributed only half to global warming compared to theaverage estimated emissions from global rivers. Furthermore, surrounding land-use types, i.e. urban,roads, and agriculture, signi cantly affected the river emissions. Rivers closed to urban areas releasedmore than four-time of the amount of the major GHGs compared to rivers closed to the nature sites. Byapplying machine learning, we were able to identify the main important factors to the emissions fromurban river systems. These results highlighted the impacts of land-use types and water quality on theriver emissions which can be used to estimate the emissions from the global rivers.Session Selection:GC078. Urban Areas and Global ChangeSubmitter's E-mail Address:long.tuanho@UGent.beAbstract Title:Effects of land use and water quality on greenhouse gas emissions from an urban river systemRequested Presentation Type:Assigned by Program Committee (Oral, eLightning, or Poster)Previously Published?:YesPreviously Published Material:The preliminary results of the study was presented in IWA-IDB Innovation Conference 2019 with the title"Greenhouse Gas Emissions from the Integrated Urban Wastewater Systems in Cuenca".The  nal results ofthe study was written as a manuscript which is currently under review in Science of the Total Environment.AGU On-Demand:YesAbstract Payment:Paid (agu-fm20-676751-8230-5316-3627-3104)For non-students only: I do not want to be involved in OSPA or the mentoring program. /Second AuthorRuben Jerves-CoboPrimary Email: rubenf.jervesc@ucuenca.edu.ecA liation(s):Universidad de Cuenca PROMAS Cuenca A01000 (Ecuador)Third AuthorMatti BarthelPrimary Email: matti.barthel@usys.ethz.chA liation(s):ETH Zurich Department of Environmental System`s Science Zurich (Switzerland)Fourth AuthorJohan SixPrimary Email: johan.six@usys.ethz.chA liation(s):ETH Zurich Department of Environmental System`s Science Zurich (Switzerland)Sixth AuthorPascal F M BoeckxPrimary Email: pascal.boeckx@ugent.beA liation(s):Ghent University Ghent (Belgium)Sixth AuthorSamuel BodePrimary Email: Samuel.Bode@UGent.beA liation(s):Ghent University Department of Green Chemistry and Technology Gent 9000 (Belgium)Seventh AuthorPeter GoethalsPrimary Email: peter.goethals@ugent.be/A liation(s):Ghent University Gent 9000 (Belgium)If necessary, you can make changes to your abstract submissionTo access your submission in the future, point your browser to: User PortalYour Abstract ID# is: 676751.Any changes that you make will be re ected instantly in what is seen by the reviewers.After the abstract proposal is submitted, you are not required to go through all submission steps tomake edits. For example, click the "Authors" step in the Abstract Submission Control Panel to edit theAuthors and then click save or submit.When you have completed your submission, you may close this browser window or submit anotherabstract proposal: Call for Abstracts.Tell us what you think of the abstract submission process

Effects of land use and water quality on greenhouse gas emissions from an urban river system

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Effects of land use and water quality on greenhouse gas emissions from an urban river system

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