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Biogeochemical Impacts of Dam Removal on Little River Floodplain Wetlands

Explore the relationships between floodplain, wetland, and channel biogeochemistry following the removal of a dam on the Little River in North Carolina. The study delves into the release of stored wetland waters, impacts on biogeochemical components like DOC, NO3, NH4, PO4, and the successional changes in floodplain ecosystems post-dam removal.

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Biogeochemical Impacts of Dam Removal on Little River Floodplain Wetlands

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  1. Floodplain Wetland and Channel Biogeochemical Relationships following Dam Removal on a Coastal Plain River Adam Riggsbee1, Robert G. Wetzel1, Martin W. Doyle2 and Jason P. Julian2 1 Department of Environmental Sciences and Engineering at UNC-Chapel Hill 2 Department of Geography at UNC-Chapel Hill

  2. Today’s Talk • The dam removal begins… • Fresh Data (4-28-05) • Dam dewatering releases stored wetland surface and ground waters into the adjacent channel • Biogeochemical impacts • DOC • NO3, NH4 • PO4

  3. Little River Background • 4th order • Edge of piedmont and coastal plain • Neuse River Basin • Matrix supported sand/gravel • Floodplain wetlands are permanently inundated bottomland hardwood forests (impounded) • ~ 8km impoundment

  4. Dam Little River, NC FLOW

  5. Impoundment Dewatering

  6. April 25, 2005 April 28, 2005 Impoundment Dewatering

  7. June 06, 2005 Floodplain Succession July 13, 2005

  8. ISCO 1 Dam ISCO 2 Little River, NC FLOW

  9. Dewatering Hydrology • Event occurred near baseflow (1.87 m3/s) • Qpeak = 3.20 m3/s • Duration • 13 h • Dam Team sampled for 8 h • 6 h during event

  10. Preliminary Conclusions • Minimal loading • Short duration • TSS/Nutrient contributions negligible relative to other dam removal studies • Doyle, et al. 2003

  11. ISCO 1 Dam ISCO 2 Little River, NC FLOW

  12. Wetland Surface H2O Dewatering • Little impact on channel biogeochemistry • TSS contributions rapidly attenuated • What about wetland groundwater drainage?

  13. Ongoing Dewatering Research

  14. Ongoing Research • Floodplain wetland plant treatments • Colonized • Uncolonized • Plant biomass • Fungal biomass • Bacterial productivity • Interstitial [N, P, C]

  15. Ongoing Research • Greenhouse mesocosms • Nutrient attenuation during low velocity flood events • Independent variable • Plant biomass • Nutrient source/sink

  16. Acknowledgements • Robert G. Wetzel • The Dam Team (4-28-05) • The Wundergrads • US Fish and Wildlife Service • Restoration Systems, LLC.

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