Browsing by Subject "Knife River"

Now showing 1 - 4 of 4
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    Data for Impacts of beaver dams on low-flow hydrology and hydraulics, Knife River, Minnesota
    (2021-06-07) Gran, Karen B; Behar, Hannah; Burgeson, Emma; Dymond, Salli; Dumke, Josh; Teasley, Rebecca; kgran@d.umn.edu; Gran, Karen B
    These data were collected as part of a two-year investigation into the impacts of beaver dam removal on low-flow hydrology and hydraulics in the Knife River, Minnesota, USA. Eight sub-basins were monitored for two years, organized as four pairs of sub-basins. The study focused on small headwater sub-basins, with areas ranging from 1.58 to 6.4 km2. In 2018, all of the study basins had active beaver dams. In 2019, the beavers were removed and dams notched in half of the sub-basins, one half of each of the four pairs. Data collection continued throughout the 2019 season measuring impacts post-dam removal.
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    Fish data for Impacts of beaver dams on low-flow hydrology and hydraulics, Knife River, Minnesota
    (2021-09-16) Dumke, Joshua D.; jddumke@d.umn.edu; Dumke, Joshua D.; University of Minnesota Duluth - Natural Resources Research Institute
    These data were collected as part of a two-year investigation into the impacts of beaver dam removal on low-flow hydrology and hydraulics in the Knife River, Minnesota, USA. These data are general surveys of fish communities in 2018 around project beaver dams which were included in the low-flow hydrology and hydraulics project (https://conservancy.umn.edu/handle/11299/220310), as well as a mark-recapture study conducted in 2019 around active and inactive beaver dams in the Knife River and French River to evaluate how beaver dams affect fish movement during the low-flow period of late summer.
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    High-resolution topographic data (TLS and SfM) of river bluffs in Amity Creek and the Knife River, Minnesota, USA, 2016-2018
    (2020-01-08) Kelly, Sara, A; Brown, Elizabeth; Gran, Karen, B; kgran@d.umn.edu; Gran, Karen, B; University of Minnesota Earth & Environmental Sciences
    Over the past few years, more and more river bluffs on North Shore (Minnesota, USA) streams are being stabilized using a technique wherein a bankfull bench is created adjacent to an eroding bluff using a combination of toe wood, rock, and soil lifts. One of the goals of this technique is to reduce the amount of fine sediment entering the river from bluff erosion, both by removing river access to the toe of the bluff and by providing a bench for eroding sediment to deposit on. In order to determine how much erosion and deposition were occurring on these bluffs, we monitored six river bluffs on the Knife River and Amity Creek from 2016-2018. We report data on four bluffs in Amity Creek and two in the Knife River: 4 bluffs that were stabilized in the 2014 and 2015 using a bankfull bench design and 2 additional bluffs that have not had work done on them for comparison. Each bluff was surveyed 2-3 times each between 2016 and 2018 using a Faro Focus 3D terrestrial laser scanner (TLS), and all four stabilized bluffs were surveyed once via photogrammetry from a DJI Phantom 4 UAV (uncrewed aerial vehicle). The photogrammetry data were turned into high-resolution topographic data using Structure-from-Motion (SfM) processing. Repeat data at each site were compared using Geomorphic Change Detection to calculate volumes of change. In addition, SfM and TLS data collected simultaneously are compared to test the efficacy of using photogrammetry data to monitor bluff erosion.
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    Knife River Macroinvertebrate and Sediment Survey
    (University of Minnesota Duluth, 2007) Brady, Valerie; Breneman, Dan
    This effort was conducted as part of the Knife River TMDL (total maximum daily load) study for turbidity, and includes data to compare invertebrate community composition, habitat structure, and sediment deposition among Knife River sites. Macroinvertebrate, stream substrate, water quality, and fish and invertebrate habitat data were collected from five sites along the Knife River and its tributaries in August 2006. The study’s objectives were two-fold: first, to collect baseline data from several locations within the Knife River watershed, which is currently listed as impaired for turbidity; and second, to compare these data to historical data from the Knife River watershed and other North Shore streams. Turbidity and embeddedness affect stream invertebrates and fish by raising water temperature, reducing search distances for visual predators, clogging or abrading delicate gill tissue, filling in interstitial spaces among stream cobbles, and other detrimental effects. To put current data into perspective, Knife River TMDL sample locations were compared to historical samples within the Knife River watershed and other North Shore streams using macroinvertebrate assemblage metrics and, for one set of samples, substrate and water physical parameters. Due to differences in sampling methodology, macroinvertebrate metrics had to be calculated differently for comparison with historical data.