2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/22/2018 | 2:00 PM - 2:15 PM | IMPACTS OF SEDIMENT DREDGING ON PHOSPHORUS DYNAMICS OF A RESTORED RIPARIAN WETLAND | 430 B
IMPACTS OF SEDIMENT DREDGING ON PHOSPHORUS DYNAMICS OF A RESTORED RIPARIAN WETLAND
A wetland restoration project within the Muskegon Lake watershed (MI) was initiated in 2012 to hydrologically reconnect a former riparian wetland to its adjacent stream. The wetland complex was drained in the early 1900s for agricultural production but refilled naturally after farming ceased in the late 1990s. Initial studies indicated that the sediments contained significant amounts of legacy phosphorus (P), so hydrologic reconnection risked the net movement of P from the wetland complex to already eutrophic waterbodies downstream. Sediment dredging was selected to reduce this risk, which occurred in 2016. We evaluated restoration success by measuring sediment P release in the wetlands prior to, and after, dredging. Sediment cores were incubated under two water temperatures (ambient; +2°C) and two oxygen levels (oxic; hypoxic). Our results showed that the mean maximum total P release rate in all four post-dredging treatments was lower (mean±SD = 0.56 ± 4.2 mg m-2 d-1) than release rates of pre-dredging treatments (mean±SD = 65.9 ± 37.5 mg m-2 d-1), suggesting that sediment removal is an effective approach to reduce internal P loading of restored agricultural lands.
- Wetland
- Connectivity
- Restoration
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Presenters/Authors
Kim Oldenborg
(), Annis Water Resources Institute-Grand Valley State University , oldenbok@mail.gvsu.edu;
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Alan Steinman
(), Annis Water Resources Institute-Grand Valley State University, steinmaa@gvsu.edu;
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Nonfinancial -