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Floodplain Wetland and Channel Biogeochemical Relationships following Dam Removal on a Coastal Plain River Adam Riggsbee 1, Robert G. Wetzel 1, Martin.

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Presentation on theme: "Floodplain Wetland and Channel Biogeochemical Relationships following Dam Removal on a Coastal Plain River Adam Riggsbee 1, Robert G. Wetzel 1, Martin."— Presentation transcript:

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

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3 Today’s Talk The dam removal begins…The dam removal begins… –Fresh Data ( ) –Dam dewatering releases stored wetland surface and ground waters into the adjacent channel Biogeochemical impactsBiogeochemical impacts –DOC –NO 3, NH 4 –PO 4

4 Little River Background 4 th order4 th order Edge of piedmont and coastal plainEdge of piedmont and coastal plain Neuse River BasinNeuse River Basin Matrix supported sand/gravelMatrix supported sand/gravel Floodplain wetlands are permanently inundated bottomland hardwood forests (impounded)Floodplain wetlands are permanently inundated bottomland hardwood forests (impounded) ~ 8km impoundment~ 8km impoundment

5 Little River, NC Dam FLOW

6 Impoundment Dewatering

7 April 25, 2005 Impoundment Dewatering April 28, 2005

8 June 06, 2005 Floodplain Succession July 13, 2005

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10 Little River, NC Dam FLOW ISCO 1 ISCO 2

11 Dewatering Hydrology Event occurred near baseflow (1.87 m 3 /s)Event occurred near baseflow (1.87 m 3 /s) Q peak = 3.20 m 3 /sQ peak = 3.20 m 3 /s DurationDuration –13 h Dam Team sampled for 8 hDam Team sampled for 8 h –6 h during event

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17 Preliminary Conclusions Minimal loadingMinimal loading Short durationShort duration TSS/Nutrient contributions negligible relative to other dam removal studiesTSS/Nutrient contributions negligible relative to other dam removal studies –Doyle, et al. 2003

18 Little River, NC Dam FLOW ISCO 1 ISCO 2

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22 Wetland Surface H 2 O Dewatering Little impact on channel biogeochemistryLittle impact on channel biogeochemistry TSS contributions rapidly attenuatedTSS contributions rapidly attenuated What about wetland groundwater drainage?What about wetland groundwater drainage?

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25 Ongoing Dewatering Research

26 Ongoing Research Floodplain wetland plant treatmentsFloodplain wetland plant treatments –Colonized –Uncolonized Plant biomassPlant biomass Fungal biomassFungal biomass Bacterial productivityBacterial productivity Interstitial [N, P, C]Interstitial [N, P, C]

27 Ongoing Research Greenhouse mesocosmsGreenhouse mesocosms –Nutrient attenuation during low velocity flood events Independent variableIndependent variable –Plant biomass –Nutrient source/sink

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


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