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31 results for “Upper Little Tennessee River”
Coweeta Synoptic Data from 49 sampling sites in the Upper Little Tennessee River Basin from 2009 to 2010 (diameter of LWD data)
This data was generated as part of synoptic sampling conducted at the Coweeta LTER between June 2009 and May 2010. 49 wadeable streams with low levels of development were sampled throughout the Upper Little Tennessee River Basin in the Southern Appalachians. Effects of riparian vegetative conditions on a suite of channel morphological variables were investigated: active channel width, variability of width within a reach, large wood frequency, mesoscale habitat distributions, median particle size, and percent fines. Diameter of large woody debris (LWD) in each stream reach were tallied in this specific dataset. At each site, a uniform 150 meter section of stream was surveyed. All wood in a reach exceeding 10cm diameter and 1.0m length were tallied. Observers kept a tally of the function, if any, of the large woody debris within the channel (e.g. pool formation, jam formation, bank protection, etc.). A whitepaper on the Synoptic field sampling activites can be found at: http://coweeta.uga.edu/publications/white%20paper%20summary%20of%20synoptic%20sampling.pdf
Late-Holocene paleofloods in the Upper Little Tennessee River valley, Southern Blue Ridge Mountains, USA.
We derive a paleoflood chronology for the past 2000 years from three stratigraphic sections of overbank sediments with dates from radiocarbon, luminescence, 137Cs techniques, and historical records. Particle sizes were measured in 6-15 year intervals in post-1870 sediments and in 45-170 year intervals in pre-1870 sediments using an automatic laser analyzer. The sedimentological characteristics of ad 1948-2009 deposits were compared with gaging records, demonstrating that fine sand content and sorting discern time intervals of large floods, but flood magnitudes are not well resolved. This modern analog was applied to pre-1870 sediments and revealed two periods in the last 2000 years with large floods during AD 650-850 and AD 1100-1350, which are times when the regional tree-ring record showed extreme wetness and no severe or extreme droughts. Our findings indicate flood-prone phases of transitional climate at the beginning and end of the "Medieval Warm Period" (MWP), and relatively subdued flooding during the "Little Ice Age" (LIA), possibly correlated with rearrangement of macro-scale atmospheric circulation patterns between the MWP and the LIA. (Wang, L. and Leigh, D.S. 2012. Late Holocene paleofloods in the Upper Little Tennessee River Valley, Southern Blue Ridge Mountains, USA. The Holocene, 22(9): 1061-1066. DOI: 10.1177/0959683612437863.)
In situ soil moisture measurements for the Hillslope study from 5 sites located in Macon County, North Carolina, within the Upper Little Tennessee River Basin
This study was conducted across 5 sites that served as part of the regional hillslope study. Synoptic soil moisture measurements were measured using a Theta Probe that measures surface soil moisture up to a depth of 6cm. Site locations include 18 plots in WS14, 17 plots in Fall Branch, 13 plots in WS18, 10 plots on Mica City Road, and 12 plots at Ammons Creek. The measurement period varied among sites. The most complete is WS14 lasting about 3 years of regular measurements starting in 2011.
Porous tension-cup lysimeter depths and soil water chemistry from 9 Hillslope Project sites in Macon County, North Carolina, within the Upper Little Tennessee River Basin
Porous tension-cup lysimeters were installed at 9 sites throughout Macon County beginning in 2011. Sites represented a gradient of land use, including relatively undisturbed forests, valley bottomlands in agriculture, and mountain developments. Eighteen lysimeters were placed at each site - 9 were shallow lysimeters located in the A horizon and 9 were deep lysimeters located in the B horizon. Collections were made every other week and samples were composited monthly for chemistry. The depths of the lysimeters were noted.
Maximum soil depths from 9 Hillslope Project sites in Macon County, North Carolina, within the Upper Little Tennessee River Basin
Maximum soil depths were assessed as part of the soil bulk density and soil chemistry studies at the hillslope plots in Macon County, North Carolina. There were 9 hillslope representing a gradient of development, including forested, valley agriculture, and mountain housing developments. A soil probe was used to estimate the maximum soil depth of each of the 12 10 x 10-m plots at each site.
Tree, shrub, and herb data from 10 Hillslope Project sites located in Macon County, North Carolina, within the Upper Little Tennessee River Basin
Vegetation was surveyed on 10 sites in the upper Little Tennessee River watershed in Macon County, North Carolina during the summer of 2012. The sites represent a gradient of development, including forested sites, agricultural sites, and exurban sites. All woody vegetation >2.5 cm diameter at breast height (DBH) was measured and identified within twelve 10 x 10 m plots at each site. Woody shrubs >0.5 m in height and <2.5 cm DBH were counted and identified within a 1x10 m transect in each plot. Herbs and woody plants <0.5m in height were identified and percent cover estimated in 3 1 x 1 m subplots located within each of the larger 10 x 10 m plots.
Sediment Source Ascription of Forest Roads in the Upper Little Tennessee River Basin
The purpose of this project was to better understand if geochemical fingerprinting could determine sediment provenance for catchments with and without USDA Forest Service Roads. Sediment source ascription is valuable because sediment is one of the most important non-point source pollutants affecting surface waters in the southeastern United States. Gravel roads represent surfaces of geologically fresh material, rich in weatherable minerals, some of which are preserved in transport, and distinguishable in sediment deposits. Sediment samples were collected from sources of active erosion as well as within the channel near watershed outlets. Analysis for 33 elements, along with statistical separation allowed provenance to be determined for roads and stream banks. Discriminant analysis shows that road sediment is differentiated by P, Mo, and Na. Bank sediment can be distinguished by Pb. Road sources accounted for 39 to 61 percent of bedload sediment and the remainder was from banks.
Patch occupancy sampling of invertebrates and salamanders from Coweeta Synoptic sampling sites located in the Upper Little Tennessee River Basin, 2009 to 2012.
This research was conducted in Macon County, North Carolina, as part of the Coweeta LTER synoptic sampling program. In the summers of 2009-2012 we sampled and counted Tallaperla species, Elimia species, fish, and salamanders found in a 150meter stretch at the synoptic sites, a total of 44 sites. The 150meter stretch was divided into thirty 5meter plots that were sampled on three occasions each year of sampling; in 2009 all 44 sites were sample, in 2010 a subset of 8 sites were sampled, in 2011 a subset of 9 sites were sampled, and in 2012 a subset of 8 sites were sampled.
Riparian Buffer Classifications for the Upper Little Tennessee River watershed
This data set includes riparian buffer classifications for streams in the Upper Little Tennessee River Watershed that were developed from the corrected streams data set. Riparian buffer classifications were not developed for streams occurring in Nantahala National Forest. The corrected streams data set includes streams mapped by the NC Stream Mapping Program (NCSMP) that have been corrected based on their presence or absence as observed in 2006 aerial imagery. Streams mapped by the NCSMP were downloaded from http://www.ncstreams.org/DataAccess/tabid/257/Default.aspx and corrected using aerial photography for Swain and Macon Counties dated 2006 that were obtained by EEP. Four classes of riparian buffer widths were created based on the presence or absence of woody vegetation in the riparian area as viewed in the 2006 aerial photos. Right and left banks were analyzed separately and include the following classes: 1 = < 30 feet 2 = 30-100 feet 3= > 100 feet, and 4 = underground This data set is intended to characterize riparian buffer conditions for streams in the Upper Little Tennessee River Watershed. The riparian buffer classification data set is believed to provide a reasonable basis for generalizing about sub-watershed and watershed conditions. Riparian buffer classification is also one of the key data sets used to determine aquatic function and stream rehabilitation project potential. This data set provides an initial estimate of likely riparian buffer conditions, but a field examination of the area in question is recommended if accurate information on the current buffer status of specific reaches or properties is desired.
Land Change Trajectories across Four Watersheds in the Upper Little Tennessee River Basin
These data were collected to reconstruct spatially explicit land use/land cover change trajectories that were temporally consistent and at very high accuracies for a selection of watersheds in Macon County, NC: Cartoogechaye, Coweeta, Skeenah and Watauga. Buildings (points) and roads (lines) were digitized from historic maps and aerial photographs and aligned where necessary for temporal consistency. Land cover was simultaneously classified across all years for each 25x25m pixel (1/16 ha) in order to maximize temporal consistency.
Stream temperatures in the upper Little Tennessee and Chattooga River watersheds, Macon County, North Carolina, USA
We used HOBO Water Temp Pro v2 loggers to measure stream temperature at 10 minute intervals in 9 1st, 2nd and 3rd order streams in the upper Little Tennessee and Chattooga River watersheds, Macon County, North Carolina, U.S.A. The dataloggers were deployed in January and February 2020. Data collections are ongoing. Stream temperature data will be used to help assess the impacts of climate change and anthropogenic disturbances (e.g., removal of riparian vegetation and artificial ponds) on stream temperature in these smaller headwater streams.
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