Oldham, C; Beer, J; Blodau, C; Fleckenstein, JH; Jones, Lydia; Neumann, C; Peiffer, S: Controls on iron(II) fluxes into waterways impacted by acid mine drainage: A Damköhler analysis of groundwater seepage and iron kinetics, Water Research, 153, 11-20 (2019), online: 14.01.2019, doi:10.1016/j.watres.2018.12.024
Stichworte: Reactive transport; Sediment water interface; Mine lake; Acidity generation;
Abstract:

When acidic groundwater flows into an aquatic system the sediment water interface (SWI) acts as a transition zone between the groundwater and lake water, and often exhibits strong physical and biogeochemical gradients. The fate of groundwater-borne solutes, such as Fe(II), is determined by the balance between the exposure time during transport across the SWI and the reaction time within the SWI, however the relative role of groundwater seepage rates and iron kinetics on acidity generation in lakes is unknown. Porewater seepage velocities, porewater chemical profiles, and limnological data were collected across multiple field campaigns over the last two decades, in acid Mine Lake 77, in Lusatia, Germany.
This rare data set was analyzed using a Damkoehler approach that compares exposure and reactions timescales, to determine that Fe(II) would typically be transported with little reaction across the SWI, spatially separating it from sediment-processes that produce alkalinity and providing a source of acidity to the lake. This Damk€ohler analysis further showed that remediation should be focused on reducing groundwater seepage velocities and enhancing exposure times. Strategic planting of submerged benthic macroalgae would slow groundwater inflows, as well as oxygenating overlying waters and supplying organic matter to the sediments. A similar Damkoehler analysis could be used to assess the fate of any groundwater-borne reactive chemicals (e.g. phosphorus) into lakes and streams.

Aktuelle Termine


BayCEER-Kolloquium:
Do. 27.01.2022
BayCEER Mitgliederversammlung
Digitale Vortragsreihe KlimaDiskurse (bayklif):
Di. 08.02.2022
10.000 Klafter Holz oder eine grüne Menschenfreude?
Ökologisch-Botanischer Garten:
So. 06.02.2022
Führung | Edel und gut? Tropenhölzer und heimische Alternativen
So. 20.02.2022
Vortrag "Zwischen Elburs und Zagros: Auf botanischer Sammelreise im Irak"
So. 06.03.2022
Sonntagsführung | Angepasst! Tropische Schmetterlinge und ihre Raupen-Futterpflanzen
Wetter Versuchsflächen
Luftdruck (356m): 985.2 hPa
Lufttemperatur: 0.8 °C
Niederschlag: 0.7 mm/24h
Sonnenschein: 6 h/d
Wind (Höhe 17m): 15.5 km/h
Wind (Max.): 29.2 km/h
Windrichtung: W

...mehr
Globalstrahlung: 1 W/m²
Lufttemperatur: -2.0 °C
Niederschlag: 0.0 mm/24h
Sonnenschein: <1 h/d
Wind (Höhe 32m): 0.0 km/h

...mehr
Diese Webseite verwendet Cookies. weitere Informationen