Browsing by Author "Baldus, David, B"

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    Northshore Stream Restoration Assessment Physical Habitat Survey Data
    (2023-08-17) Baldus, David, B; Gran, Karen, B; baldu024@d.umn.edu; Baldus, David, B
    These data are the result of a field season of physical habitat surveys conducted on control and treatment reach pairs at six stream restoration projects. Physical habitat characterization survey procedures were adapted from the NRSA Physical Habitat Characterization Survey and the Minnesota Stream Quantification Tool. They include longitudinal and cross-sectional survey data, grain size distribution data, as well as riparian and in-channel habitat data. The treatment reach of each pair was restored and the control reach was not. The control reach was not treated as a degraded pre-restoration reach nor as the standard to be restored to but rather as a representative reach undisturbed by restoration efforts. These surveys were conducted as part of an effort to assess the effects that restoration practices have on a stream ecosystems.
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    Sargent Creek Nutrient Injection Breakthrough Curve
    (2022-09-15) Baldus, David, B; Gran, Karen, B; baldu024@d.umn.edu; Baldus, David, B
    Breakthrough curve data from nutrient injection tracer tests conducted at Sargent Creek on 2021-09-15 and 2021-09-22. The tests were conducted in two stream reaches, the treatment reach which was restored with a full channel realignment in 2019 and the control reach which was not restored. These tracer tests were conducted as part of an effort to assess the effects that restoration practices have on a stream ecosystems. A solution of nutrients (Potassium Nitrate (KNO3), Ammonium dihydrogen phosphate ((NH4)H2PO4)) and a conservative tracer (Sodium Chloride (NaCl)) dissolved in stream water was injected into the stream at the top of the reach as an instantaneous release. Water samples were collected in the thalweg at downstream end of the reach to describe reach-scale nutrient spiraling. Additionally water samples were collected at two sites located mid-reach at the upstream and downstream end of a representative riffle type habitat unit to describe the nutrient cycling within these individual habitat units. Timing of sampling was determined by a conductivity meter in order to capture rising, peak, and falling concentrations and generate a breakthrough curve (BTC).