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Using cores and seismic surveys the previous study identified a series of relict infilled paleochannels in dissecting PAIS. The sediment cores presented in our poster were collected in Fall with a Geoprobe DT. The XRF data was used to examine mineralogical differences that provide valuable insight into the evolutionary history of the island. This poster presents results from sediment cores collected to validate the geophysical survey data. The broader purpose of this research is to validate the subsurface framework geology features i. Tule elk Cervus elaphus nannodes , a subspecies endemic to California, was historically found in large herds throughout much of central and coastal California.
Market hunting during the California Gold Rush decimated these herds, and by , only two to 10 elk remained. This remnant group was protected and served as the source for early relocation efforts McCullough, The herd grew rapidly and supported six controversial hunts between and In an effort to limit hunting, concerned preservationists formed the Committee for the Preservation of Tule Elk in Public pressure resulted in the California State Legislature passing a law in that halted hunting until either state-wide numbers reached 2,, or no further unoccupied elk habitat existed.
This law prompted the California Department of Fish and Game to begin reintroducing tule elk throughout their former range.
In , the U. Point Reyes National Seashore was identified as a potential translocation site. This study was conducted to gain a better understanding of fishery resources in Abbotts Lagoon, Point Reyes National Seashore. A total of 2, fish represented by eight species was captured during the study. Gill nets captured Sacramento perch, Archoplites interruptus; largemouth bass, Micropterus salmoides; Pacific herring, Clupea pallasi; prickly sculpin, Cottus asper, silver surfperch, Hyperprosopon ellipticum; longfin smelt, Spirinchus thaleichthys; and striped bass, Morone saxatilis; whereas minnow traps captured Sacramento perch; prickly sculpin; and threespine stickleback, Gasterosteus aculeatus.
Cluster analysis Ward's minimum variance method of fish catch statistics identified two major species assemblages-the first dominated by Sacramento perch and, to a lesser extent, by largemouth bass, and the second dominated by Pacific herring and threespine stickleback. Simple discriminant analysis of environmental variables indicated that salinity contributed the most towards separating the two assemblages.
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Population dynamics of tule elk at point Reyes National Seashore , California. The presence of locally abundant wildlife raises questions about natural regulation and ecological consequences of overpopulation. We sought to establish precise information about population size, structure, and productivity to examine the role of natural regulation in a closed tule elk Cervus elaphus nannodes population at Point Reyes National Seashore , California, USA.
We estimated an instantaneous exponential growth rate of 0. We estimated annual survival for adult cows of nearly 0. Calf survival from birth through the rut ending during October-November was 0. Male calves exhibited higher mortality than female calves.
Cow mortality was associated with the calving season. We observed a density-correlated reduction in the rate of increase and in the cow:calf ratios prior to high precipitation El Nin??
Given the high population growth rate and model evaluation of management scenarios, park managers will need to use a suite of approaches, such as contraception and removal, to maintain the elk population at levels at or near the closed-range carrying capacity for years between El Nin?? Freshwater in the highly permeable, sandy aquifer underlying Fire Island is bounded laterally by marine surface waters and at depth by saline groundwater. Interspersed throughout FIIS are 17 pre-existing residential communities that in summer months greatly increase in population through the arrival of summer residents and vacationers; in addition, the National Park Service NPS has established several facilities on the island to accommodate visitors to FIIS.
The 2. Waste-contaminated groundwater can move through the aquifer and threaten the ecological health of the adjacent back-barrier estuaries to which much of the groundwater ultimately discharges. Geological Survey USGS , in cooperation with the NPS, began a 3-year investigation to 1 collect groundwater levels and water-quality nutrient samples, 2 develop a three-dimensional model of the shallow water-table aquifer system and adjacent marine surface waters, and 3 calculate nitrogen loads in simulated groundwater discharges from the aquifer to back-barrier estuaries and the ocean.
The hydrogeology of the shallow aquifer system was characterized from the results of exploratory drilling, geophysical surveying, water-level monitoring, and water-quality sampling.
Thirty-five observation wells were installed within FIIS to characterize subsurface hydrogeology and establish a water-table monitoring network in the four study areas. Hurricane Sandy had a dramatic impact along coastal areas in proximity to landfall in late October , and those impacts have been well-documented in terrestrial coastal settings. However, due to the lack of data on submerged marine habitats, similar subtidal impact studies have been limited.
This study, one of four contemporaneous studies commissioned by the US National Park Service, developed maps of submerged shallow water marine habitats in and around Cape Cod National Seashore , Massachusetts. All four studies used similar methods of data collection, processing and analysis for the production of habitat maps.
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One of the motivations for the larger study conducted in the four coastal parks was to provide park managers with a baseline inventory of submerged marine habitats, against which to measure change after future storm events and other natural and anthropogenic phenomena. In this study data from a phase-measuring sidescan sonar, bottom grab samples, seismic reflection profiling, and sediment coring were all used to develop submerged marine habitat maps using the Coastal and Marine Ecological Classification Standard CMECS.
Sidescan sonar imagery covering The seashore would be Interpretive programs would focus on illustrating how barrier Cumberland Island is the southernmost and largest barrier island along the coast of Georgia.
elisenothmo.tk The island contains about 2, acres of freshwater wetlands that are located in a variety of physical settings, have a wide range of hydroperiods, and are influenced to varying degrees by surface and ground water, rainwater, and seawater. Geological Survey, in cooperation with the National Park Service, conducted a water-quality study of Cumberland Island National Seashore to document and interpret the quality of a representative subset of surface- and ground-water resources for management of the seashore 's natural resources.
As part of this study, historical ground-water, surface-water, and ecological studies conducted on Cumberland Island also were summarized. Surface-water samples from six wetland areas located in the upland area of Cumberland Island were collected quarterly from April to March and analyzed for major ions, nutrients, trace elements, and field water-quality constituents including specific conductance, pH, temperature, dissolved oxygen, alkalinity, tannin and lignin, and turbidity. In addition, water temperature and specific conductance were recorded continuously from two wetland areas located near the mean high-tide mark on the Atlantic Ocean beaches from April to July Fish and invertebrate communities from six wetlands were sampled during April and December The microbial quality of the near-shore Atlantic Ocean was assessed in seawater samples collected for 5 consecutive days in April at five beaches near campgrounds where most recreational water contact occurs.
Ground-water samples were collected from the Upper Floridan aquifer in April and from the surficial aquifer in April at 11 permanent wells and 4 temporary wells drive points , and were analyzed for major ions, nutrients, trace elements, and field water-quality constituents conductivity, pH, temperature, dissolved oxygen, and.
Accuracy assessment of a mobile terrestrial lidar survey at Padre Island National Seashore. Lim, Samsung; Thatcher, Cindy A. The higher point density and mobility of terrestrial laser scanning light detection and ranging lidar is desired when extremely detailed elevation data are needed for mapping vertically orientated complex features such as levees, dunes, and cliffs, or when highly accurate data are needed for monitoring geomorphic changes.
Mobile terrestrial lidar scanners have the capability for rapid data collection on a larger spatial scale compared with tripod-based terrestrial lidar, but few studies have examined the accuracy of this relatively new mapping technology. For this reason, we conducted a field test at Padre Island National Seashore of a mobile lidar scanner mounted on a sport utility vehicle and integrated with a position and orientation system.
The purpose of the study was to assess the vertical and horizontal accuracy of data collected by the mobile terrestrial lidar system, which is georeferenced to the Universal Transverse Mercator coordinate system and the North American Vertical Datum of To accomplish the study objectives, independent elevation data were collected by conducting a high-accuracy global positioning system survey to establish the coordinates and elevations of 12 targets spaced throughout the 12 km transect. These independent ground control data were compared to the lidar scanner-derived elevations to quantify the accuracy of the mobile lidar system.
The performance of the mobile lidar system was also tested at various vehicle speeds and scan density settings e. After adjustment of the lever arm parameters, the final point cloud accuracy was 0. The very high density of the resulting point cloud was sufficient to map fine-scale topographic features, such as the complex shape of the sand dunes.
Nagle, David B. Wayne; Bonisteel, Jamie M. These remotely sensed, geographically referenced color-infrared CIR imagery and elevation measurements of lidar-derived bare-earth BE topography, first-surface FS topography, and canopy-height CH datasets were produced collaboratively by the U. Petersburg Science Center, St. The datasets are made available for use as a management tool to research scientists and natural-resource managers.
The EAARL system is a raster-scanning, waveform-resolving, green-wavelength nanometer lidar designed to map near-shore bathymetry, topography, and vegetation structure simultaneously. The EAARL sensor suite includes the raster-scanning, water-penetrating full-waveform adaptive lidar, a down-looking red-green-blue RGB digital camera, a high-resolution multispectral CIR camera, two precision dual-frequency kinematic carrier-phase GPS receivers, and an integrated miniature digital inertial measurement unit, which provide for sub-meter georeferencing of each laser sample.
A single pilot, a lidar operator, and a data analyst constitute the crew for most survey operations. Elevation measurements were collected over the survey area. Bonisteel, Jamie M. These remotely sensed, geographically referenced elevation measurements of lidar-derived bare-earth BE topography were produced as a collaborative effort between the U.
This project provides highly detailed and accurate datasets of the Assateague Island National Seashore in Maryland and Virginia, acquired March , The EAARL sensor suite includes the raster-scanning, water-penetrating full-waveform adaptive lidar, a down-looking red-green-blue RGB digital camera, a high-resolution multi-spectral color infrared CIR camera, two precision dual-frequency kinematic carrier-phase GPS receivers, and an integrated miniature digital inertial measurement unit, which provide for sub-meter georeferencing of each laser sample.
These remotely sensed, geographically referenced elevation measurements of lidar-derived first-surface FS topography were produced as a collaborative effort between the U. This paper presents an analysis of the aerosol chemical composition, optical properties and size distributions for a range of conditions encountered during a field measurement campaign conducted between July , at Point Reyes National Seashore , north of San Francisco, CA.
During the first half of the campaign July , conditions at the site were largely maritime. Neither flow regime was associated with air coming from the San Francisco Bay area to the south. Measurements by an Aerodyne aerosol mass spectrometer AMS of the equivalent molar ratio of ammonium to the sum of sulfate, nitrate and chloride made before the onset of the thermal trough on July 18th were associated with acidic or near-neutral particles.
Measurements made after July 18th appear to have excess ammonium. However, the AMS measures only non-refractory particles between 0. These remotely sensed, geographically referenced elevation measurements of lidar-derived bare-earth BE and first-surface FS topography datasets were produced collaboratively by the U.
This project provides highly detailed and accurate datasets of a portion of the Fire Island National Seashore in New York, acquired post-Nor'Ida November nor'easter on December 4, The EAARL sensor suite includes the raster-scanning, water-penetrating full-waveform adaptive lidar, a down-looking red-green-blue RGB digital camera, a high-resolution multispectral color-infrared CIR camera, two precision dual-frequency kinematic carrier-phase GPS receivers, and an integrated miniature digital inertial measurement unit, which provide for sub-meter georeferencing of each laser sample.
Elevation measurements were collected over the survey area using the EAARL system, and the resulting data were then processed using the Airborne. Vivekanandan, Saisudha; Klipp, E.
These remotely sensed, geographically referenced color-infrared CIR imagery and elevation measurements of lidar-derived bare-earth BE and first-surface FS topography datasets were produced collaboratively by the U. This project provides highly detailed and accurate datasets of a portion of the Fire Island National Seashore in New York, acquired on July 9 and August 3, Elevation measurements were collected over the survey area using the EAARL system, and the resulting data were then processed using the Airborne Lidar.
Lellis, William A. Sky; Stewart, Brent. The purpose of the systems was to obtain photographic data to help understand possible relationships between anthropogenic activities and Pacific harbor seal Phoca vitulina richardsi behavior and distribution. The value of the NPS photographs for use in assessing the frequency and impacts of seal disturbance and displacement in Drakes Estero has been debated.
Limitations of the photographs included lack of study design, poor photographic quality, inadequate field of view, incomplete estuary coverage, camera obstructions, and weather limitations. In response to that recommendation, the NPS asked the U. Geological Survey USGS to conduct an independent review of the photographs and render an opinion on the utility of the remote camera data for informing the environmental impact analyses included in the DEIS. In consultation with the NPS, we selected the photographic dataset for detailed evaluation because it covers a full harbor seal breeding season March 1 to June 30 , provides two fields of view two cameras were deployed , and represents a time period when cameras were most consistently deployed and maintained.
The NPS requested that the photographs be evaluated in absence of other data or information pertaining to seal and human activity in. These east-west trending islands form a barrier between the Mississippi Sound to the north and the Gulf of Mexico to the south. The islands are generally less than 1 km wide with dune elevations ranging generally between 2 and 3 m, but reaching 6 m on Horn Island.
The interaction of waves and currents with the low, sandy beaches forces a range of dynamic responses, such as dune erosion, overwash deposition, spit elongation, and island breaching. The passage of strong hurricanes such as Camille in and Katrina in , combined with a background signal of long-term shoreline retreat, has caused significant coastal changes on the Mississippi barrier islands, presenting management challenges for State and Federal officials, including NPS resource managers.