Simulation of Regional Ground-Water Flow in the Suwannee River Basin, Northern Florida and Southern Georgia

Planert, Michael

doi:10.3133/sir20075031

Cited by 4 publications

(15 citation statements)

References 34 publications

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“…A similar case is for the Floridan Aquifer at Valdosta, where it is recharged by surface waters [27], which are then partly redirected towards Statenville-Jennings. The transmissivity of the Upper Floridan Aquifer in this area has values of over 900 m 2 /day (in the western parts of Echols and Hamilton counties, which are surrounded by areas with much lower transmissivities of around 140-185 m 2 /day) [28], and this may also explain the efficient groundwater-streamwater export of the tidal signals. Semidiurnal oscillations in a streamwater level were also studied for another river, Wybong, in Australia/New South Wales-this river belongs to the Hunter River basin.…”

Section: Resultsmentioning

confidence: 88%

Changes in Physical Properties of Inland Streamwaters Induced by Earth and Atmospheric Tides

Briciu

2019

Water

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Earth and atmospheric tides create oscillations in water parameters of inland rivers, mainly due to the similar behavior of groundwaters. Tidal oscillations of inland rivers were termed orthotides and were detected in fluctuations of water level and specific conductivity of some rivers. However, few things are understood about orthotides because of their recent discovery. Here, we show that orthotidal signals exist in streamwater temperature too. Wavelet and T_TIDE analyses are used to study streamwater temperature and specific conductivity. We found solar and lunar semidiurnal orthotides (S2 and M2) in Alapaha River (USA) water temperature and Wybong River (Australia) water specific conductivity with amplitudes of up to 0.6 °C and 11.3 µS/cm. We demonstrate that the tidal semidiurnal cycles have statistical significance and are caused by similar cycles in groundwater. Oscillations found in water temperature time series for some new moon time intervals have shapes that correlate with the gravitational tides. Diurnal and fortnightly tidal cycles were found and overlapped with other natural cycles with similar periodicities. The inclusion of more water parameters to the list of orthotidally sensitive parameters indicates the wider than expected environmental impact of the small periodic natural changes.

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Section: Resultsmentioning

confidence: 88%

Changes in Physical Properties of Inland Streamwaters Induced by Earth and Atmospheric Tides

Briciu

2019

Water

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“…The similarities in groundwater levels and stream stages indicate hydraulic connection and water exchange between the surficial aquifer system and surface water. The water table in the surficial aquifer system parallels topography in a subdued manner and generally lies within 10 ft of land surface (Planert, 2007). Steep gradients occur between streams and ridges or hills; gentle gradients exist in broad, flat interstream areas and under broad topographic highs.…”

Section: Groundwater Levels and Fluctuationsmentioning

confidence: 99%

Geohydrology of the Aucilla-Suwannee-Ochlockonee River Basin, south-central Georgia and adjacent parts of Florida

Torak¹,

Painter²,

Peck³

2010

Scientific Investigations Report

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Major streams and tributaries located in the Aucilla-Suwannee-Ochlockonee (ASO) River Basin of south-central Georgia and adjacent parts of Florida drain about 8,000 square miles of a layered sequence of clastic and carbonate sediments and carbonate Coastal Plain sediments consisting of the surficial aquifer system, upper semiconfining unit, Upper Floridan aquifer, and lower confining unit. Streams either flow directly on late-middle Eocene to Oligocene karst limestone or carve a dendritic drainage pattern into overlying Miocene to Holocene sand, silt, and clay, facilitating water exchange and hydraulic connection with geohydrologic units. Geologic structures operating in the ASO River Basin through time control sedimentation and influence geohydrology and water exchange between geohydrologic units and surface water. More than 300 feet (ft) of clastic sediments overlie the Upper Floridan aquifer in the Gulf Trough-Apalachicola Embayment, a broad area extending from the southwest to the northeast through the center of the basin. These clastic sediments limit hydraulic connection and water exchange between the Upper Floridan aquifer, the surficial aquifer system, and surface water. Accumulation of more than 350 ft of low-permeability sediments in the Southeast Georgia Embayment and Suwannee Strait hydraulically isolates the Upper Floridan aquifer from land-surface hydrologic processes in the Okefenokee Basin physiographic district. Burial of limestone beneath thick clastic overburden in these areas virtually eliminates karst processes, resulting in low aquifer hydraulic conductivity and storage coefficient despite an aquifer thickness of more than 900 ft. Conversely, uplift and faulting associated with regional tectonics and the northern extension of the Peninsular Arch caused thinning and erosion of clastic sediments overlying the Upper Floridan aquifer southeast of the Gulf Trough-Apalachicola Embayment near the Florida-Georgia State line. Limestone dissolution in Brooks and Lowndes Counties, Ga., create karst features that enhance water-transmitting and storage properties of the Upper Floridan aquifer, promoting groundwater recharge and water exchange between the aquifer, land surface, and surface water. Structural control of groundwater flow and hydraulic properties combine with climatic effects and increased hydrologic stress from agricultural pumpage to yield unprecedented groundwater-level decline in the northwestern and central parts of the ASO River Basin. Hydrographs from continuous-record observation wells in these regions document declining groundwater levels, indicating diminished water-resource potential of the Upper Floridan aquifer through time. More than 24 ft of groundwater-level decline occurred along the basin's northwestern boundary with the lower Apalachicola-Chattahoochee-Flint River Basin, lowering hydraulic gradients that provide the potential for groundwater flow into the ASO River Basin and southeastward across the Gulf Trough-Apalachicola Embayment region. Slow-moving groundwater across t...

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“…The lower reaches of these tributaries are incised into the highly transmissive Upper Floridan aquifer, as is most of the Suwannee River (the reach downstream from White Springs), and substantial interactions occur between the aquifer and these river reaches (and the numerous springs occurring along these reaches). To support analyses of the groundwater system in the Suwannee River Basin, a numerical model was constructed using the MODFLOW code that simulates groundwater flow in the Upper Floridan aquifer and the interaction of the river system with the aquifer [11]. The Suwannee River Basin Model (SRBM) simulates a single aquifer layer under steady-state conditions approximate to September 1990 [11].…”

Section: Introductionmentioning

confidence: 99%

“…To support analyses of the groundwater system in the Suwannee River Basin, a numerical model was constructed using the MODFLOW code that simulates groundwater flow in the Upper Floridan aquifer and the interaction of the river system with the aquifer [11]. The Suwannee River Basin Model (SRBM) simulates a single aquifer layer under steady-state conditions approximate to September 1990 [11]. Data for calibration came from September 1990 measurements of groundwater levels, discharge at gaging stations for the Suwannee, Alapaha, northern Withlacoochee, Santa Fe, Fenholloway, Aucilla, Econfina, and Steinhatchee Rivers, and spring flows at seven first-magnitude springs [11] (Figure 2).…”

Section: Introductionmentioning

confidence: 99%

“…The Suwannee River Basin Model (SRBM) simulates a single aquifer layer under steady-state conditions approximate to September 1990 [11]. Data for calibration came from September 1990 measurements of groundwater levels, discharge at gaging stations for the Suwannee, Alapaha, northern Withlacoochee, Santa Fe, Fenholloway, Aucilla, Econfina, and Steinhatchee Rivers, and spring flows at seven first-magnitude springs [11] (Figure 2). It should be noted that the study area includes two distinct Withlacoochee Rivers that are described herein as "northern Withlacoochee," referring to the major tributary with headwaters in Georgia, and "southern Withlacoochee," referring to the river discharging to the Gulf of Mexico approximately 30 mi.…”

Section: Introductionmentioning

confidence: 99%

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Applying Downscaled Global Climate Model Data to a Groundwater Model of the Suwannee River Basin, Florida, USA

Swain¹,

Davis²

2016

AJCC

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The application of Global Climate Model (GCM) output to a hydrologic model allows for comparisons between simulated recent and future conditions and provides insight into the dynamics of hydrology as it may be affected by climate change. A previously developed numerical model of the Suwannee River Basin, Florida, USA, was modified and calibrated to represent transient conditions. A simulation of recent conditions was developed for the 372-month period 1970-2000 and was compared with a simulation of future conditions for a similar-length period 2039-2069, which uses downscaled GCM data. The MODFLOW groundwater-simulation code was used in both of these simulations, and two different MODFLOW boundary condition "packages" (River and Streamflow-Routing Packages) were used to represent interactions between surface-water and groundwater features. The hydrologic fluxes between the atmosphere and landscape for the simulation of future conditions were developed from dynamically downscaled precipitation and evapotranspiration (ET) data generated by the Community Climate System Model (CCSM). The downscaled precipitation data were interpolated for the Suwannee River model grid, and the downscaled ET data were used to develop potential ET and were interpolated to the grid. The future period has higher simulated rainfall (10.8 percent) and ET (4.5 percent) than the recent period. The higher future rainfall causes simulated groundwater levels to rise in areas where they are deep and have little ET in either the recent or future case. However, in areas where groundwater levels were originally near the surface, the greater future ET causes groundwater levels to become lower despite the higher projected rainfall. The general implication is that unsaturated zone depth could be more spatially uniform in the future and vegetation that requires a range of conditions (substantially wetter or drier than average) could be detrimentally affected. This vegetation would include wetland species, especially in areas inland from the coast.

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Simulation of Regional Ground-Water Flow in the Suwannee River Basin, Northern Florida and Southern Georgia

Abstract: Vertical coordinate information is referenced to the National Geodetic Vertical Datum of 1929 (NGVD of 1929); horizontal coordinate information is referenced to the North American Datum of 1983 (NAD 83).

Cited by 4 publications

References 34 publications

Changes in Physical Properties of Inland Streamwaters Induced by Earth and Atmospheric Tides

Changes in Physical Properties of Inland Streamwaters Induced by Earth and Atmospheric Tides

Geohydrology of the Aucilla-Suwannee-Ochlockonee River Basin, south-central Georgia and adjacent parts of Florida

Applying Downscaled Global Climate Model Data to a Groundwater Model of the Suwannee River Basin, Florida, USA

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