Between Dec 19, 2024 and Jan 2, 2025, datasets can be submitted to DRUM but will not be processed until after the break. Staff will not be available to answer email during this period, and will not be able to provide DOIs until after Jan 2. If you are in need of a DOI during this period, consider Dryad or OpenICPSR. Submission responses to the UDC may also be delayed during this time.

Browsing by Author "Deering, Emily"

Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    Floating Treatment Wetlands in a Northern Climate: Examination of Phosphorus and Nitrogen Removal
    (2016-05) Deering, Emily
    Excess phosphorus is the largest contributor to nutrient impairment in Minnesota waters. Floating treatment wetlands (FTWs) are a novel best management practice (BMP) to reduce excess nutrients in waterbodies. This study examines the nutrient reduction efficiency of floating treatment wetlands in a northern climate under agricultural loading conditions. A field-based, mesocosm study was completed to quantify the removal efficiency of total phosphorus, Orthophosphate-P, Nitrate-N, and Ammonia-N. The FTWs were each planted with wetland plants Juncus effusus, Eleocharis acicularis, and Glyceria canadensis. A system phosphorus budget was prepared to identify phosphorus sources and sinks within the BMP. Floating treatment wetlands had higher total phosphorus reduction efficiencies. Eleocharis acicularis had the fastest growth rate and highest removal efficiency of the three plants studied. Mesocosms with FTWs had statistically significant lower pH and dissolved oxygen concentrations. Further research areas and FTW design improvements are recommended based on findings from this experiment.
  • Thumbnail Image
    Item
    Sediment Control Log Performance, Design, and Decision Matrix for Field Applications
    (Minnesota Department of Transportation, 2019-05) Chapman, John; Wilson, Bruce; Holmberg, Kerry; Deering, Emily
    Significant time and money are currently being expended in the purchase and installation of sediment control logs. These logs often fail because of poorly understood performance limits and improper installation. This project investigated the performance limits by determining the flow and sediment removal characteristics of different types of logs. The physical characteristics and flow rates per project area were evaluated with twelve different logs. The densities and flow rate of materials in these logs varied between 0.035 gm/cm3 and 1508 ft /min for wood fiber to 0.269 gm/cm3 and 208 ft/min for compost. Flow rates were predicted using a power function of density with fair accuracy (r2=0.64) and predicted with good accuracy using saturated conductivity (r2=0.87) or capillary moisture content (r2=0.81). A sediment flume was constructed and used to evaluate sediment removal and failure rates. One log with three replicates of each type of material was tested. There was a positive, power function relationship between percent finer and mean log capture (r2 = 0.91). Field information was collected and used in conjunction with hydraulic and sediment data to develop selection guidelines for sediment control logs. Educational materials were prepared for workshops.