1 11 A STABLE ISOTOPE STUDY IN DRAINED PEATLANDS Riku Eskelinen Hannu Marttila AnnaKaisa Ronkanen and Björn Klöve Department of Process and Environmental Engineering Water Resources and ID: 816719
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Slide1
EFFECT OF SOIL FROST ON SNOWMELT RUNOFF GENERATION AND WATER QUALITY
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A STABLE ISOTOPE STUDY IN DRAINED PEATLANDS
Riku Eskelinen, Hannu Marttila, Anna-Kaisa Ronkanen and Björn KlöveDepartment of Process and Environmental Engineering Water Resources and Environmental Engineering Laboratory
19.4.2013
Slide2Presentation outline
Study sites and data collection methodsBackground information and research questionsResultsConclusions19.4.2013Water Resources and Environmental Engineering Laboratory Riku Eskelinen, Hannu Marttila, Anna-kaisa Ronkanen and Björn Klöve2/11
Slide3Data
collection from two contrasting peatlands12 h interval water samples during snowmelt periodWeekly snow
samplesSoil samples for pore water analysis
Continous flow measurementsWater samples analysed for: Color, EC, pH, SS, Turbidity, δ18O, δ2H
Selected samples analysed for: Al, Ba,
Mn
, DOC, Fe, Zn,
Sr
, Ti, N, NO
2+3
N, NH
4
N, P, PO
4P and SiO2
19.4.2013
Water Resources and Environmental Engineering Laboratory Riku Eskelinen, Hannu Marttila, Anna-kaisa Ronkanen and Björn Klöve
3/11
Slide4Korentosuo area
Peat extraction areaSurface area 200 ha19.4.2013Water Resources and Environmental Engineering Laboratory Riku Eskelinen, Hannu Marttila, Anna-kaisa Ronkanen and Björn Klöve4/11
Slide5Rokua area
Peatland forestry site in groundwater discharge areaSurface area 3 ha4/19/2013Water Resources and Environmental Engineering Laboratory Riku Eskelinen, Hannu Marttila, Anna-kaisa Ronkanen and Björn Klöve5/11
Slide619.4.2013
Water Resources and Environmental Engineering Laboratory Riku Eskelinen, Hannu Marttila, Anna-kaisa Ronkanen and Björn Klöve6/11WHY ?30 % of the surface area of Finland is covered with peat soil of which approximately half has been drainedPeatlands can be seen in water courses as increased particular matter and humic substancesLack of comparative studies between peatlands with different land-use
In previous studies sampling has been mainly done in summer time~50% of yearly flux originates from snowmelt periodEffect of soil frost and snowmelt on water quality needs clarification
Slide7Results
korentosuo rokua19.4.2013Water Resources and Environmental Engineering Laboratory Riku Eskelinen, Hannu Marttila, Anna-kaisa Ronkanen and Björn Klöve7/11
EC(µS/cm)
δ
18
O
Color
Flow (l/s) Flow (l/s) Flow (l/s
)
Slide8discussion
19.4.2013Water Resources and Environmental Engineering Laboratory Riku Eskelinen, Hannu Marttila, Anna-kaisa Ronkanen and Björn Klöve8/11
Slide9Results
korentosuo Rokua19.4.2013Water Resources and Environmental Engineering Laboratory Riku Eskelinen, Hannu Marttila, Anna-kaisa Ronkanen and Björn Klöve9/11
DOC (mg/l) FE(µg/l) N(µg / l)
Flow (l/s) Flow (l/s) Flow (l/s)
Slide10Summary
19.4.2013Water Resources and Environmental Engineering Laboratory Riku Eskelinen, Hannu Marttila, Anna-kaisa Ronkanen and Björn Klöve10/11Soil frost plays an important role water quality during the snowmelt periodSoil frost promotes snowmelt overland flow which results in low concentration of DOC, FE, and nutrientsSnowmelt peak in unfrozen soil infiltrates trough the soil, leaching DOC, FE and nutrientsResults can be used to improve water protection policies
Slide11Thank you for
listeningRiku.eskelinen@oulu.fiwww.oulu.fi/poveshttps://twitter.com/_Eske_This study was partly funded by VAPO OY SULKA project19.4.2013Water Resources and Environmental Engineering Laboratory Riku Eskelinen, Hannu Marttila, Anna-kaisa Ronkanen and Björn Klöve
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