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Some of the material in is restricted to members of the community. By logging in, you may be able to gain additional access to certain collections or items. If you have questions about access or logging in, please use the form on the Contact Page.
Late spring or early summer brings an abrupt onset of a wet season to Peninsular Florida (PF). High daily rain rates are sustained throughout the summer until the demise of the wet season in autumn. Prediction of the Peninsular Florida...
In groundwater modeling, the term "post audit" refers to a method of verifying simulated (predicted) data produced by a groundwater model against analogous measured data. According to Anderson et. al., (2015), evaluation of model...
Lake Jackson in Leon County Florida is a shallow perched dissolution lake, which sits above the Cody Scarp and is formed from the coalescence of sinkholes. Lake Jackson currently has two open sinkholes, Porter Sink and Lime Sink....
A physical split window technique for deriving precipitable water utilizing VAS data
Description:
An algorithm is examined which uses Visible Infrared Spin Scan Radiometer (VISSR) Atmospheric Sounder (VAS) 11 and 12 $\mu$m (split window) data to derive precipitable water at mesoscale resolution. The algorithm is physically based and... Good ground truth data are available for verifying results from the technique. The bias-corrected first guess produces improved results compared to the original version. A mean absolute retrieval error of 3.0 mm is obtained on 19 June...
Lane (2001) proposed that the flow from Lost Creek contributed to the discharge of Spring Creek Springs via an unverified conduit system similar to the verified conduit system that contributes flow to Wakulla Spring. In order to...
The dissertation reports a series of hydrological studies that relates to seawater intrusion in a karst aquifer. In the Woodville Karst Plan (WKP), karst conduit system is well developed and directly open to the Gulf of Mexico that...
The environmental impacts of COVID-19 and the “new normal” of working from home are being explored in the scientific community. However, there is currently no published study on the COVID-19 impacts to nitrate load via septic systems....
Tracing groundwater flow into the northeastern Gulf of Mexico using a naturally occurring radon-222
Description:
Submarine groundwater discharge and recirculated seawater may provide important chemical constituents to the ocean, but the dispersed nature of this process makes locating and quantifying its input difficult. Two approaches were taken to... The response of seepage meters to water motion effects was evaluated in the nearshore study area through time-series experiments using empty and 1000-mL prefilled collection bags. It was confirmed that prefilling the plastic bags... Concentrations of $\sp{222}$Rn in groundwater are 3 to 4 orders of magnitude higher than seawater. Integrated concentrations in the nearshore waters overlying a seepage meter transect showed a significant positive relationship to direct... Factors influencing the concentration of radon in the inner continental shelf waters (i.e., production-decay, horizontal transport, and benthic advection and diffusion) were evaluated using a linked benthic exchange-horizontal transport...
Numerical models of saltwater intrusion from brackish canals in southeast Florida
Description:
Salt water intrusion has been a major threat to the water supply in south Florida. A conceptual model has been developed to study the dynamical characteristics of the groundwater system of brackish water canals. The conceptual model with a low permeability layer including tidal changes in the canal and seasonal changes of groundwater level provides a full explanation of the salt water intrusion process from the brackish water canal. The salt... The model is applied to the Hollywood wellfield to determine if water management strategies can prevent further intrusion. The model predicts that the brackish water intrusion of the C-10 canal is a slow process. It appears that one year...
Well-developed karst aquifers contain high permeability limestone matrix and much higher conductive conduits, this dual porosity system behaves totally different from other kinds of aquifers and becomes a challenging task for modern...
Karst aquifers are vulnerable to contamination, as conduits and fractures in the aquifers are preferential flow paths where contaminants move fast. On the other hand, the presence of conduits and fractures make groundwater modeling for...
Wakulla Springs, located in the Woodville Karst Plain (WKP) of Florida’s Big Bend, is a complex phreatic cave system characterized by convoluted, irregular, conduit geometry—reaching depths between 45 meters to 90 meters (Werner, 2001)....
THE HYDROLOGICAL INVERSE PROBLEM: RECONSIDERATION AND APPLICATION TO THE MICROCOMPUTER (GROUNDWATER, TRANSMISSIVITY)
Description:
A new, robust and versatile method to solve the hydrological inverse problem has been conceived, developed and thoroughly tested. This method obtains transmissivity values in the form required for commonly-used computer models. By... The method is tested by means of a synthetic application. Transmissivity, head and flux distributions are chosen as functions of space so as to meet the steady-state hydrological equation. The transmissivity is then put aside, and... The method is applied with success to a portion of the Sand-and-Gravel Aquifer of northwest Florida. Comparison of the results of the application with transmissivity values available from pumping tests shows good agreement. Sensitivity... The method's ease of use and its format for the microcomputer make it well-suited for the hydrologist without expertise in inverse methods or extensive computer facilities. Its application to both synthetic and real aquifer situations...
Physical processes that enhance heavy rainfall in association with warm season (April-September) fronts are investigated over western North Carolina. In this region of complex terrain encompassing the basins of the Upper Catawba River, ...
Groundwater is a vital natural resource, and our ability to protect and manage this resource efficiently and effectively relies heavily on our ability to perform reliable and accurate computer modeling and simulation of subsurface...
This study investigates the effects of geological structure of the aquifers and the chemistry of water by testing the water chemistry variation such as the main cations (Na+, K+, Ca2+, Mg2+) and anions (Cl-, SO4 2-, HCO3 -) and TDS from...
This dissertation implements three studies related to understanding the impacts of groundwater-surface water interactions on both the aquatic geochemistry and water quantity of karst spring systems. The first study examined aquifer and...
To determine if the distinct deuterium (D) and oxygen-18 (18O) signature of precipitation from a tropical storm or hurricane could be used as a natural tracer in a springshed, isotope analyses of water samples from Wakulla Spring in...
Patterns and rates of chemical evolution of groundwater near a sinkhole lake, northern Florida
Description:
To better understand the hydrochemical interaction between groundwater and lakewater in a mantled karst setting, a comprehensive study was conducted to determine the processes that control the patterns and rates of chemical evolution of... Groundwater downgradient of Lake Barco was anoxic, with elevated concentrations of hydrogen sulfide, ferrous iron, and methane, resulting from leakage of lakewater through reducing, organic-rich sediments at the bottom of the lake. Based... This research study has provided a framework for a better understanding of recharge processes and the importance of both abiotic (mineral dissolution and precipitation) and biotic (microbially mediated degradation of organic matter)...
The simulation of overland flow accumulation is critical for drainage network extraction, soil moisture monitoring, and hydrological modeling, etc. A variety of flow accumulation algorithms have been developed, but the complex and...
The submarine equilibrium profile: A physical model
Description:
The concept of the submarine equilibrium profile has long been established. This dissertation first proposes a conceptual model based on the well established concept. Then it proposes an analytical model with a differential equation which is based on the Airy wave theory and the wave-induced asymmetrical onshore... A "SIMPLEX" non-linear regression algorithm was used to write a computer program "SIMPYA" in GWBASIC. The computer program approaches two unknown parameters in the equation using sample profile data plotted on some coasts around... A wave tank, a wave generator and an adjustable platform were designed and constructed by the author, and were used in an effort to verify the analytical model. The unique platform provides independently adjustable settings of slope and... The Application of the model may include assessment of profile stability, profile evolutionary trends, development of transitional models and coastal engineering calculations.
Transport of organic contaminants in a surficial sand aquifer--hydrogeologic and geochemical processes affecting transport movement
Description:
Transport of organic contaminants in a sand and gravel aquifer has been investigated in order to increase our understanding of hydrologic and geochemical processes affecting movement of selected organic solutes in groundwater. An... Both numerical and analytical transport simulations were performed, in order to compare and contrast results from each. Even with dispersion equal to zero, advective flow resulted in particle transport well beyond the boundaries of the... The complexities of solute migration in groundwater preclude any study from providing unique solutions. Available laboratory experiments on behavior of organic solutes and comparable field investigations at other sites support...
Changes in water balance variables such as runoff and evapotranspiration (ET) are essential in planning and management of land and water resources. Two major factors affecting these variables are climate and land use change. There is a...
Hydrologic studies of lakes tend to not include groundwater inputs as they are seen as a negligible amount to the water budget. However, there are certain environments such as Geographically Isolated Wetlands (GIW) in which groundwater...
This dissertation provides a comprehensive analysis of the intricate dynamics of coastal systems under the extreme stress of hurricanes. A multi-faceted study on the interactions between hydrodynamics, morphology dynamics, and various...
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