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DETERMINATION OF BACKGROUND GROUNDWATER LEVEL TRENDS AND CONTRIBUTING FACTORS IN THE SURFICIAL, INTERMEDIATE, AND FLORIDAN AQUIFER SYSTEMS IN CENTRAL AND SOUTH FLORIDA
Title
DETERMINATION OF BACKGROUND GROUNDWATER LEVEL TRENDS AND CONTRIBUTING FACTORS IN THE SURFICIAL, INTERMEDIATE, AND FLORIDAN AQUIFER SYSTEMS IN CENTRAL AND SOUTH FLORIDA.
Creator
Geddes, Elizabeth Tara, Oleinik, Anton E., Florida Atlantic University, Department of Geosciences, Charles E. Schmidt College of Science
Abstract/Description
Groundwater is a valuable resource essential for residential, agricultural, commercial, and environmental water supply needs in Florida. Understanding drivers of groundwater level trends and time series forecasting in vulnerable areas provides water managers with timely information for effective resource protection. This study evaluates groundwater level trends in the surficial, intermediate and Floridan aquifer systems in Central and South Florida at 106 unconfined and confined aquifer wells...
Show moreGroundwater is a valuable resource essential for residential, agricultural, commercial, and environmental water supply needs in Florida. Understanding drivers of groundwater level trends and time series forecasting in vulnerable areas provides water managers with timely information for effective resource protection. This study evaluates groundwater level trends in the surficial, intermediate and Floridan aquifer systems in Central and South Florida at 106 unconfined and confined aquifer wells using 15 to 27 years of data through 2019. Wells were clustered into relatively homogenous groups based on spatial characteristics using the k mean clustering method. Land surface and top of aquifer elevations as well as groundwater level ranges were key factors. Distance to the coast was also important for surficial aquifer clustering, while proximity to water supply wells influenced Mid-Hawthorn aquifer (MHA) results. Principal component analyses (PCAs) were performed using rainfall, temperature, actual evapotranspiration, El Niño Southern Oscillation, and population data and regressed against average monthly groundwater levels for each cluster. This study is the first of its kind PCA using variables impacting groundwater levels in South Florida. Sandstone aquifer PCAs correlated well with groundwater levels. When compared with multiple linear regression, PCA results had similar correlation. However, the drivers of groundwater level trends identified by each method for the MHA and Upper Floridan aquifer (UFA) differed. Seasonal Kendall trend tests indicated 12 surficial aquifer wells had trends related to changes in land use and decreased usage. MHA trends were related to exploitation or a shift in water source usage. A regional increasing trend exists in the UFA in South Florida.
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Date Issued
2022
PURL
http://purl.flvc.org/fau/fd/FA00014060
Subject Headings
Aquifers--Florida, Groundwater--Florida
Format
Document (PDF)
Recognition and analysis of secondary depositional crusts in the surficial aquifer system of southeast Florida
Title
Recognition and analysis of secondary depositional crusts in the surficial aquifer system of southeast Florida.
Creator
Krupa, Steven Louis, Florida Atlantic University, Finkl, Charles W.
Abstract/Description
This investigation identified, analyzed, characterized and correlated observed geophysical log "deflections" occurring at distinct depths in the sedimentary sequence and varying systematically with reference to the coastline. The deflections correspond to dense, hard crusts within the upper portions of the Surficial Aquifer System (SAS) of Southeast Florida. These crusts are proposed as zones of paleo-freshwater fluctuations within the aquifer. The secondary depositional crusts (SDC) have...
Show moreThis investigation identified, analyzed, characterized and correlated observed geophysical log "deflections" occurring at distinct depths in the sedimentary sequence and varying systematically with reference to the coastline. The deflections correspond to dense, hard crusts within the upper portions of the Surficial Aquifer System (SAS) of Southeast Florida. These crusts are proposed as zones of paleo-freshwater fluctuations within the aquifer. The secondary depositional crusts (SDC) have migrated vertically in response to sea level changes over thousands of years. Detailed continuous geological samples were collected from three boreholes in a contamination investigation in Delray Beach, Florida. These disturbed but representative samples were analyzed at the gamma log geophysical deflection points. Samples from each of the extant crusts were examined for grain characteristics; chemical analysis of adsorbed elements was performed, as well as stratigraphic and petrographic analyses (scanning electron and petrographic microscopy). Physical laboratory characteristics were calculated and sand/carbonate composition determined.
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Date Issued
1999
PURL
http://purl.flvc.org/fcla/dt/15654
Subject Headings
Groundwater--Florida, Aquifers--Florida, Geophysical well logging--Florida
Format
Document (PDF)
Groundwater solute transport models for simulating the effects of a wellfield protection zone on contaminant transport
Title
Groundwater solute transport models for simulating the effects of a wellfield protection zone on contaminant transport.
Creator
Rueckert, William A., Florida Atlantic University, Restrepo, Jorge I.
Abstract/Description
The objective is to develop a groundwater flow model of the Surficial Aquifer System in the area of Plantation, Broward County, Florida, using the U.S. Geological Survey MODFLOW code and to make a comparison between the use of two supplementary contaminant transport models: MODPATH code and the MT3D code. The advantages and limitations of the two solute transport models are described and an evaluation is made of their accuracy with respect to delineation of traveltime related to capture zones...
Show moreThe objective is to develop a groundwater flow model of the Surficial Aquifer System in the area of Plantation, Broward County, Florida, using the U.S. Geological Survey MODFLOW code and to make a comparison between the use of two supplementary contaminant transport models: MODPATH code and the MT3D code. The advantages and limitations of the two solute transport models are described and an evaluation is made of their accuracy with respect to delineation of traveltime related to capture zones of wells. Final results of the computer simulations indicate that this study area is sensitive to river bed hydraulic conductivity and the stress of the continuous pumping at a nearby wellfield. Therefore, a critical factor in selecting an appropriate flow model for delineating the traveltime-related capture zone of a well is a model which simplifies the flow system while still preserving hydrogeologic characteristics of the flow system.
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Date Issued
1994
PURL
http://purl.flvc.org/fcla/dt/15073
Subject Headings
Pollutants, Groundwater flow--Computer simulation, Groundwater--Pollution, Aquifers--Florida--Broward County, Groundwater flow--Florida--Broward County
Format
Document (PDF)