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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
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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
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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
permanently inundated permanently inundated bottomland hardwood bottomland hardwood forests (impounded)forests (impounded)
• ~ 8km impoundment~ 8km impoundment
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Little River, NCLittle River, NC
DamDamFLOW
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Impoundment DewateringImpoundment Dewatering
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April 25, 2005
Impoundment DewateringImpoundment Dewatering
April 28, 2005
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June 06, 2005
Floodplain SuccessionFloodplain Succession
July 13, 2005
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Little River, NCLittle River, NC
DamDam
FLOW
ISCO 1
ISCO 2
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Dewatering HydrologyDewatering Hydrology
• 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
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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
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Little River, NCLittle River, NC
DamDam
FLOW
ISCO 1
ISCO 2
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Wetland Surface HWetland Surface H22O DewateringO Dewatering
• Little impact on channel biogeochemistryLittle impact on channel biogeochemistry
• TSS contributions rapidly attenuatedTSS contributions rapidly attenuated
• What about wetland groundwater What about wetland groundwater drainage?drainage?
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Ongoing Dewatering ResearchOngoing Dewatering Research
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Ongoing ResearchOngoing Research
• Floodplain wetland Floodplain wetland plant treatmentsplant treatments– ColonizedColonized– UncolonizedUncolonized
• Plant biomassPlant biomass• Fungal biomassFungal biomass• Bacterial productivityBacterial productivity• Interstitial [N, P, C]Interstitial [N, P, C]
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Ongoing ResearchOngoing Research
• Greenhouse Greenhouse mesocosmsmesocosms– Nutrient attenuation Nutrient attenuation
during low velocity during low velocity flood eventsflood events
• Independent variableIndependent variable– Plant biomassPlant biomass
– Nutrient source/sinkNutrient source/sink
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Acknowledgements
• Robert G. Wetzel
• The Dam Team (4-28-05)
• The Wundergrads
• US Fish and Wildlife Service
• Restoration Systems, LLC.