Topography, and Topography, and Soils Soils of of Lower Suwannee Lower Suwannee River Floodplain River Floodplain Forests Forests and and Ecological Ecological Consequences of Consequences of Potential Flow Potential Flow Reductions Reductions Helen Light U.S. Geological Survey
Hydrology, Topography, and Soils of Lower Suwannee River Floodplain Forests and Ecological Consequences of Potential Flow Reductions Helen Light U.S. Geological.
Jan 19, 2018
Gulf of Mexico A t l a n t i c O c e a n S u w a n n e e F e R i v e r S a t n a W i t h l a c o o c h e e R i v e r A l a p h a a R i v e r R i v e r Study Area NN Riverine LowerTidal UpperTidal
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Hydrology, Hydrology, Topography, and SoilsTopography, and Soils
of of Lower Suwannee River Lower Suwannee River
Floodplain Forests Floodplain Forests andand
Ecological Consequences of Ecological Consequences of Potential Flow ReductionsPotential Flow Reductions
Helen LightU.S. Geological Survey
Gulfof
Mexico
Atla
nti
c O
ce
an
Suw
anne
e
FeRiver
Satn a
Withlacoochee
River
Al
apha
aRiver
River
Study AreaN
Gulfof
Mexico
Atla
nti
c O
ce
an
Suw
anne
e
FeRiver
Satn a
Withlacoochee
River
Al
apha
aRiver
River
Study AreaNN
RiverinRiverinee
LowerLowerTidalTidal
UpperUpperTidalTidal
Goals
N
RiverinRiverinee
LowerLowerTidalTidal
UpperUpperTidalTidal
RIVER HYDROLOGY
FLOODPLAIN HYDROLOGY
FORESTCOMPOSITION
FLOW-DEPENDENTFACTORS
IMPACTS OF FLOWREDUCTIONS
FORESTDISTRIBUTION
TOPOGRAPHY SOILS
HydrologyN
RiverinRiverinee
LowerLowerTidalTidal
UpperUpperTidalTidal
Topography
Soils
TopographyN
RiverinRiverinee
LowerLowerTidalTidal
UpperUpperTidalTidal
Range 11 feet Levees & ridges prominent
Range 3 feet Levees minor or absent
Hummocks commonTidal creeks common
SoilsN
RiverinRiverinee
LowerLowerTidalTidal
UpperUpperTidalTidal
Mineral soils
Saturated muck
Saturated muckSaline
Floodplain InundationN
RiverinRiverinee
LowerLowerTidalTidal
UpperUpperTidalTidal
Floodplain InundationN
RiverinRiverinee
LowerLowerTidalTidal
UpperUpperTidalTidal
Flow dependent at all flows
Flow dependent at high flows
Little or no relation to flow
Goals
N
RiverinRiverinee
LowerLowerTidalTidal
UpperUpperTidalTidal
RIVER HYDROLOGY
FLOODPLAIN HYDROLOGY
FORESTCOMPOSITION
FLOW-DEPENDENTFACTORS
IMPACTS OF FLOWREDUCTIONS
FORESTDISTRIBUTION
TOPOGRAPHY SOILS
Flow Dependent FactorsN
RiverinRiverinee
LowerLowerTidalTidal
UpperUpperTidalTidal
Flood depthsInundationSaturation
Flood depthsInundation
Salinity
Flood depths affects composition by limiting seedling survival
Floodplain Cross Section
High water
Aquatic habitat in floodplain is flow dependent
Inundated Area in Relation to Flow (Riverine)
0
2,000
4,000
6,000
8,000
10,000
12,000
14,000
0 5,000 10,000 15,000 20,000 25,000 30,000
FLOW, IN CFS
INU
ND
ATE
D A
REA
, IN
AC
RES
Loss of Forests at Tree Line
OPEN WATERMARSHESSWAMP
HAMMOCKAQUATIC BEDSSWAMPS REPLACED BY MARSH
Ecological Consequences of Flow Reductions
Forest composition changes:
Exotic species Opportunistic species Human disturbance Lower quality of BLH Fewer wet swamps Forest mortality at tree line
Ecological Consequences of Flow Reductions
Decreased inundation and saturation:
Aquatic habitat for fishes & invertebrates
Nutrient and detritus transport Nitrate removal Water retention during
droughts Vulnerability to fire
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