Floodplain Wetland and Floodplain Wetland and Channel Biogeochemical Channel Biogeochemical Relationships following Relationships following Dam Removal on a Coastal Dam Removal on a Coastal Plain River Plain River Adam Riggsbee Adam Riggsbee 1 , Robert G. , Robert G. Wetzel Wetzel 1 , Martin W. Doyle , Martin W. Doyle 2 and and Jason P. Julian Jason P. Julian 2 1 1 Department of Environmental Department of Environmental Sciences and Engineering at UNC- Sciences and Engineering at UNC- Chapel Hill Chapel Hill 2 Department of Geography at UNC- Department of Geography at UNC- Chapel Hill Chapel Hill
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Adam Riggsbee 1 , Robert G. Wetzel 1 , Martin W. Doyle 2 and Jason P. Julian 2
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 - PowerPoint PPT Presentation
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Floodplain Wetland and Channel Floodplain Wetland and Channel Biogeochemical Relationships Biogeochemical Relationships following Dam Removal on a following Dam Removal on a
Coastal Plain RiverCoastal Plain River
Adam RiggsbeeAdam Riggsbee11, Robert G. Wetzel, Robert G. Wetzel11, , Martin W. DoyleMartin W. Doyle22 and Jason P. Julian and Jason P. Julian22
1 1 Department of Environmental Sciences and Department of Environmental Sciences and Engineering at UNC-Chapel HillEngineering at UNC-Chapel Hill
22 Department of Geography at UNC-Chapel Hill Department of Geography at UNC-Chapel Hill
Today’s TalkToday’s Talk
• The dam removal The dam removal begins…begins…– Fresh Data (4-28-05)Fresh Data (4-28-05)– Dam dewatering Dam dewatering
releases stored releases stored wetland surface and wetland surface and ground waters into the ground waters into the adjacent channeladjacent channel
• Biogeochemical Biogeochemical impactsimpacts
– DOCDOC– NONO33, NH, NH44
– POPO44
Little River BackgroundLittle River Background
• 44thth order order • Edge of piedmont and Edge of piedmont and
coastal plain coastal plain • Neuse River Basin Neuse River Basin • Matrix supported Matrix supported
sand/gravel sand/gravel • Floodplain wetlands are Floodplain wetlands are
• Event occurred near Event occurred near baseflow (1.87 mbaseflow (1.87 m33/s)/s)
• QQpeakpeak = 3.20 m = 3.20 m33/s/s
• DurationDuration– 13 h13 h
• Dam Team sampled Dam Team sampled for 8 hfor 8 h– 6 h during event6 h during event
Preliminary ConclusionsPreliminary Conclusions
• Minimal loading Minimal loading
• Short duration Short duration
• TSS/Nutrient contributions negligible TSS/Nutrient contributions negligible relative to other dam removal studiesrelative to other dam removal studies– Doyle, et al. 2003Doyle, et al. 2003