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OAS accession Detail for 0306500
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| accessions_id: | 0306500 | archive |
|---|---|
| Title: | NCCOS Assessment: Long-term monitoring of Living Shoreline Sill, Vegetation, and SET data in Pine Knoll Shores, NC, 2004-10-22 to 2025-04-23 (NCEI Accession 0306500) |
| Abstract: | This dataset contains long-term monitoring data collected at the Pine Knoll Shores Sill as part of a larger effort to monitor local fringing marshes in Carteret County. The monitoring data is stored in four .csv files, one .tif file, one .aux file, and two pdfs. The .csv files contain vegetative community and SET data. The .tif file consists of an ortho mosaic image, captured using a Mavic 3M drone, in 2025. The .aux file and SiteReport.pdf are files associated with the ortho mosaic. The routine vegetation surveys were conducted starting in 2008 to monitor change in the vegetative community composition and total cover at fixed plots. Prior to the vegetation surveys, four surface elevation tables (SETs) were installed in 2004 and elevation changes over time were tracked with millimeter scale resolution. More information on this site can be found here: https://arcg.is/1PufHu3 |
| Date received: | 20250709 |
| Start date: | 20041022 |
| End date: | 20250423 |
| Seanames: | North Atlantic Ocean |
| West boundary: | -76.833256 |
| East boundary: | -76.831519 |
| North boundary: | 34.701439 |
| South boundary: | 34.69979 |
| Observation types: | in situ, survey, survey - biological |
| Instrument types: | camera, GPS |
| Datatypes: | biological data, DEBRIS, MACROALGAE, SEA GRASSES - DENSITY, SPECIES IDENTIFICATION, Terrain Elevation, Vegetation Cover |
| Submitter: | LeClaire, Alyssa |
| Submitting institution: | US DOC; NOAA; NOS; National Centers for Coastal Ocean Science |
| Collecting institutions: | US DOC; NOAA; NOS; National Centers for Coastal Ocean Science |
| Contributing projects: | |
| Platforms: | |
| Number of observations: | |
| Supplementary information: | Methods: Vegetation Surveys: Transects run perpendicular to shoreline. Locate PVC/rebar posts marking the beginning and end of transects. The beginning of the transect is the lower edge of marsh vegetation (closer to the shoreline). The end of the transect is the uppermost extent of accessible marsh vegetation (away from the shoreline). Check lower and upper PVC/rebar markers with GPS coordinates if available. If PVC/rebar is not present at either location, install the lower marker at the lower edge of S. alterniflora and the upper marker at the uppermost extent of accessible marsh vegetation. Attach the end of a meter tape to the lower marker and run the meter tape perpendicular to the shoreline towards the upper marker. The meter tape serves as a guide for placing the quadrat along the transect. Label datasheet with transect number and plot number. Plot numbers correspond to the distance from the start of the transect, e.g. plot 10 is 10m from the start of the transect. Begin measuring the transect with plot -1, which is one meter shoreward of the lower edge of S. alterniflora (see diagram below). This plot is labeled 1 - -1 for transect 1, plot -1. The second plot is plot 0, at the lower edge of S. alterniflora. This plot is labeled 1-0, for transect 1, plot 0. Plots should then occur every 5m unless the transect length exceeds 20m, then plots should be measured every 10m after 20m. The last plot should be the furthest accessible plot that includes S. patens or other high marsh vegetation. Place a 1 m2 quadrat at each plot to the right of the meter tape with your back to the water. For example, for plot 5, the bottom of the quadrat with your back to the water should line up at the 5m mark from the start of the transect, while the top of the quadrat should line up at the 6m mark from the start of the transect. Identify all plant species found in the quadrat. For each species, estimate the total percent cover category over the whole quadrat. In 2006 and 2007, percent cover was estimated using Braun-Blanquet (BB) categories (Braun-Blanquet & Pavillard 1922, Braun-Blanquet 1932), but starting in 2008, Carolina Vegetation Survey (CVS) categories were used for percent cover (Peet et al. 2018). In 2020, we reverted to using Braun-Blanquet classes for percent cover following Kenworthy 1993. For oyster, please differentiate between live oyster and oyster culch. For S. alterniflora only, count the number of stems found in the lower right quarter of the quadrat with your back to water. Count live and dead stems separately. For S. alterniflora only, locate plants along the string (referring to the strings that divide the quadrat into quarters) that is parallel to the transect line. Measure the height in cm (to the extent of green material) of the first 10 live stems that contact the string or lie under it. If necessary, use the string that is perpendicular to the transect line and measure stem height along that string until a total of 10 stem heights are reached. In very sparse plots you may have to measure plants well removed from the strings. Record stem heights on data sheet. Count the number of Littoraria snails per m2, or 0.25 m2 if there are more than 25 snails per 0.25 m2. Surface Elevation Tables: Reading the Surface Elevation Tables (SETs): Unscrew the gray cap on the receiver fixed in the PVC collar. Place the vertical steel rod into notch on the receiver, making sure the steel rod is inserted all the way. Screw the cap on tight to avoid any movement in the SET during readings. Place the SET arm horizontally on the vertical steel rod. Check the letters corresponding to the holes on the SET. Each letter corresponds to a direction. Check the data sheet for which letters/holes to use. Line up the white arrow painted on the SET arm with the appropriate letter on the SET base. Clamp the SET to the base using 2 clamps. Check the total thread visible between pin arm and circular disc; should be 27 mm. (This is just a location that we decided on so that our pins consistently fall in the same place.) Check that all screws are tightened. This will reduce movement during measurements. Level the receiver using the bulls-eye level on top of the flat portion of the RSET arm as your guide. Adjust arm using screw for pitch and rod arm dial (not labeled) for roll. Insert the fiberglass pins in their respective holes on pin arm. Gently lower each pin down until the bottom tip is touching the ground. DON’T PUSH HARD, THEY SHOULD NOT GO INTO THE GROUND. You should be able to see the pin hit the ground. Sometimes this is not possible. At those times, you have to rely on the feel of the resistance changing when it touches the sediment as you push down on the top of the pin. In soft sediments, you may have to very carefully feel around the pin with your finger to make sure it is on the ground. Remove detritus such as loose shells or debris (as long as moving them does not disturb the sediment surface.) Leave live shell in place as well as dead shells that are deeply imbedded in the sediment. The sediment surface may be covered with many dead stems. Leave these in place and make a note of them. Record presence of live or dead oyster and mussel shell, holes, rocks or plants on the data sheet if pins fall on them rather than directly on sediment. Basically, if the pin does not make contact with the sediment surface due to an obstacle that is not representative of the sediment, remove the obstacle if you can do so without disturbing the sediment surface. Be careful not to bend the pins when pushing them through thick grass. In thick grass, it may be helpful to pull the pin up all the way to let the grass fall out of the way so it is not pushing on the pin. Most importantly, be consistent in how you place the pins. As you place each pin, clip it just above the top of the arm, so the pin does not slip further down into the mud. Continue with all 9 pins. Double check the level once more. Sometimes when you place the pins, it can affect the level. If it has become unleveled, pull all the pins up slightly, re-level, then set the pins again. Measure the length of each pin above the pin arm (pin height). Make sure ruler is placed evenly next to each fiberglass pin and eyes are leveled with the ruler. Be careful not to put any weight on the pin arm. Record pin height on data sheet. After measuring all pins, move them up about halfway to avoid being bent when the SET is rotated. Unclamp SET, lift it, and rotate to the next direction/letter as indicated on the data set. Be very careful not to bend pins on plant stems. You may need to move aluminum board slightly to accommodate all reading directions. Repeat steps 6-12 for all necessary directions. On at least one arm direction, do a spot-check of the arm height. You should have previously determined the arm height using the laser or optical level (see steps below). But it is good to check the arm ht. once at each SET just to make sure you have placed the instrument on the receiver properly. To check the arm ht., choose an arm direction where the pin arm is close to the benchmark, so that you can place a meter stick on the benchmark and have it reach the pin arm. Record your measurement on the data sheet. This is just a check, and you might find that the arm height you measure is a few mm off from the leveled arm ht. on the data sheet. Being off by a few mm is okay as there is some error in taking the arm ht. measurement with the meter stick. If it is more than 5 mm, double-check that the SET is sitting on the receiver properly (lined up with the notch) and leveled correctly. When you are done taking readings at one SET, and if your next SET is close by, you can simply pull the pins up halfway and move the SET intact without packing it up. Just be very careful not to bend the pins or let the pins fall out. It is usually best to have someone hold the SET rather than placing it on the ground. At sites with the fiberglass grating, you can place the vertical rod in between the grating, and the SET will sit upright. If the next location requires you to get in the truck or the boat, it is best to disassemble and pack up the SET. At your final SET reading before packing up the instrument, pull the pins up halfway and clamp them. Wipe off the bottoms of the pins with a rag to avoid dragging mud and sand inside the SET. Vegetation Plot Elevation: Elevation was collected between March 2007 to July 2020, using multiple instruments including a digital level (Leica Sprinter 250cm), optical level, laser level, and RTK. Digital level: Calibrated and perform a collimation check. Set up level per manufactures recommendations. Located the level halfway between transect lines. This is often along the middle transect. DO NOT located within the transect line. When leveling vegetation plots at SET sites the uppermost SET is used for Control. This SET has the best Orthometric Height estimate. All calculations should be referenced to this mark. When shooting the SET mark take measurements on the brass disc. Next, take a shot on the VRP (top of the SET arm receiver with the cap off). Laser level: The tripod was set up in the vicinity of both the lower and upper SETs. Screw the laser level unit onto the top of the tripod. Press the power button. The power light and laser will blink while the unit is self-leveling. When the unit is ready, the power light will be on steady and the laser will be spinning. If the battery light (middle) and the anti-drift light (far right) are blinking, the unit is unable to level itself. Turn the unit off, adjust the tripod to make the unit more level, and turn the unit on again. Place the handheld laser detector on the leveling staff and turn the detector on. Place the bottom of the leveling staff on the brass benchmark imbedded in the concrete around the SET rod. Turn so the front of the laser detector is facing towards the laser level. Slide the laser detector up and down the leveling staff. When the laser detector detects the laser beam, it will beep repeatedly and arrows will flash on the display indicating whether you should move the unit up or down. When the detector is level with the laser beam, it will beep steadily and a bar will appear on the display. Read the leveling staff in between the two black plastic points on the laser detector. Record this value in meters. Optical level: After level is set up by the surveyor, the leveling rod is placed on the mark and the rod is held on each side without touching the face with the rod face turned squarely towards the optical level (OL). The rod person will make sure the rod. Twenty-five centimeters must be visible on the rod above and below the OL field of view to read rod values. The Surveyor may also indicate to the rod person the rod needs to be extended. The surveyor sights through the eyepiece and reads the value at the center crosshair and records this value, and is called the back sight. Drone imagery: A DJI Mavic 3M drone was flown at 32m altitude at a flight speed of 2 m/s covering an area of ~0.022 km2. Ground resolution for the drone imagery was calculated to be 9 mm/pixel resolution. 298 images were taken with 75% overlap and used to create an RGB ortho mosaic of the field site. |
| Availability date: | |
| Metadata version: | 10 |
| Keydate: | 2025-07-23 19:32:27+00 |
| Editdate: | 2025-07-29 15:31:12+00 |