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Items below are listed from most recently updated to least recently updated.
These are results 1 through 25 of 25 matches.
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Publication Scientific Investigations Report 2008-5128: Submarine ground-water discharge and fate along the coast of Kaloko-Honokohau National Historical Park, Island of Hawai'i--Part 2 |
Description: The Loxahatchee River and Estuary are small, shallow, water bodies located in southeastern Florida. Historically, the Northwest Branch (Fork) of the Loxahatchee River was primarily a freshwater system. In 1947, the river inlet at Jupiter was dredged for navigation and has remained permanently open since that time. Drainage patterns within the basin have also been altered significantly due to land development, road construction (e.g., Florida Turnpike), and construction of the C-18 and other canals. These anthropogenic activities along with sea level rise have resulted in significant adverse impacts on the ecosystem over the last several decades, including increased saltwater encroachment and undesired vegetation changes in the floodplain. The problem of saltwater intrusion and vegetation degradation in the Loxahatchee River may be partly induced by diminished freshwater input, from both surface water and ground water into the River system. The overall objective of this project was to assess the seasonal surface water and groundwater interaction and the influence of the biogeochemical characteristics of shallow groundwater and porewater on vegetation health in the Loxahatchee floodplain. The hypothesis tested are: (1) groundwater influx constitutes a significant component of the overall flow of water into the Loxahatchee River; (2) salinity and other chemical constituents in shallow groundwater and porewater of the river floodplain may affect the distribution and health of the floodplain vegetation.
Description: The impending development for the west Hawai‘i coastline adjacent to Kaloko-Honokōhau National Historical Park (KAHO) may potentially alter coastal hydrology and water quality in the marine waters of the park. Water resources are perhaps the most significant natural and cultural resource component in the park, and are critical to the health and well being of six federally listed species. KAHO contains ecosystems of brackish anchialine pools, two 11-acre fishponds, and 596 acres of coral reef habitats, all fed by groundwater originating upslope. The steep gradients on high islands, combined with typically porous substrates and high rainfall levels at upper elevations, make these settings especially vulnerable to shifts in submarine groundwater discharge (SGD) and its entrained nutrients and pollutants. Little is known about the magnitude, rate, frequency, and variability of SGD and its influence on contaminant loading to Hawaiian coastal environments. Recent studies show that groundwater flux through the park is vital to many ecosystem components including anchialine ponds and wetland biota. The function of these ecosystems may be vulnerable to changes in groundwater flow stemming from natural changes (climate and sea level) and land use (groundwater pumping and contamination). Oki and others (1999) showed that increased groundwater withdrawals for urban development since 1978 likely decreased groundwater flux to the coast by 50%. During this same time, the quality of groundwater has been vulnerable to increases in contaminant and nutrient/fertilizer additions associated with industrial, commercial and residential use upslope from KAHO (Oki and others, 1999). High-resolution measurements of waves, currents, water levels, temperature and salinity were collected in the marine portion of the park from November, 2005, through July, 2006, to establish baseline information on the magnitude, rate, frequency, and variability of SGD. These data are intended to help researchers and resource managers better understand the hydrodynamics of the oceanographic environment in the park’s coastal waters as it pertains to the pathway of SGD and associated nutrient and contaminant input to the park’s coral reef ecosystem. Measurements were made of the oceanographic environment (waves, tides, currents, salinity and temperature) using hydrodynamic techniques to characterize and quantify the distribution, input and throughput of freshwater and associated nutrient/contaminant within the near shore environment of KAHO through the emplacement of a series of bottom-mounted instruments deployed in water depths less than 15 m. This study was conducted in support of the National Park Service (NPS) by the U.S. Geological Survey (USGS) Coastal and Marine Geology Program’s Coral Reef Project. These measurements support the ongoing studies of the Coral Reef Project to better understand the transport mechanisms of sediment, larvae, nutrients, pollutants and other particles on Pacific coral reefs. Subsequent reports will address the spatial and temporal variability in groundwater input and the associated nutrient flux in the park’s waters
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Publication Submarine Ground-Water Discharge: Nutrient Loading and Nitrogen Transformations |
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Research Project USGS Northern Gulf of Mexico (NGOM) - Welcome! |
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Publication USGS Professional Paper 1751: Systematic Mapping of Bedrock and Habitats along the Florida Reef Tract--Central Key Largo to Halfmoon Shoal |
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Publication USGS Open-File Report 2004-1381, Putting radon to work: Identifying coastal ground-water discharge sites, main page |
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Research Project Submarine Groundwater Discharge |
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Publication The Chesapeake Bay Bolide Impact: A New View of Coastal Plain Evolution - USGS Fact Sheet 049-98 |
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Publication An Overview of Coastal Land Loss: With Emphasis on the Southeastern United States |
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Publication Geology and Human Activity in the Florida Keys - USGS Fact Sheet |
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Publication Chemical Pollutants and Toxic Effects on Benthic Organisms, Biscayne Bay: A Pilot Study Preceding Florida Everglades Restoration - USGS Open File Report 02-308 |
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Research Project Subsidence and Fault Activation Related to Fluid Energy Production, Gulf Coast Basin |
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Research Project Chemical Pollutants and Toxic Effects on Benthic Organisms, Biscayne Bay, Florida |
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Publication Process Classification Of Coastal Land Loss Between 1932 And 1990 In The Mississippi River Delta Plain, Southeastern Louisiana |
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Publication Geologic History of Cape Cod Massachusetts |
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Publication Lake Pontchartrain, LA, Geochemistry |
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Research Project Atchafalaya and Mississippi River Deltas Study |
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Educational Materials A Photo Gallery of Florida's Big Bend Tidal Wetlands |
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Research Project Geologic Framework and Processes of the Lake Pontchartrain Basin |
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Research Project Geologic Characterization of Lakes and Rivers of Northeast Florida |
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Publication High-Resolution Single-Channel Seismic Reflection Surveys of Orange Lake and Other Selected Sites of North Central Florida - Open File Report 94-616 |
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Publication Seismic Stratigraphy of the Central Indian River Region - Open File Report 97-723 |
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Publication An Environmental Bibliography of Buzzards Bay, MA |
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Educational Materials Chesapeake Bay Bolide: Modern Consequences of an Ancient Cataclysm |
These are results 1 through 25 of 25 matches. | |
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