1,339 research outputs found
Developing a Street Sweeping Credit for Stormwater Phosphorus Source Reduction: Final Report
No full textA Project of the Minnesota Stormwater Research CouncilHobbie, Sarah E.; King, Rachel; Belo, Tessa; Baker, Lawrence A.; Finlay, Jacques C.. (2020). Developing a Street Sweeping Credit for Stormwater Phosphorus Source Reduction: Final Report. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/219371
Effect of dissolved iron on CDOM and other optical properties for dissolved organic matter in lakes and rivers of the Upper Great Lakes states
No full textThree data files are included. The first contains the 2014-2016 field and lab data for 450 sets of measurements on 280 lakes across the NLF, NCHF and NMW ecoregions in Minnesota, Wisconsin, and Michigan. In addition to site names, location information (latitude/longitude), ecoregion, and sampling date, the file contains data on Secchi depth, CDOM measured as a(440), DOC, dissolved iron, chlorophyll-a, specific UV absorbance at 254 nm, SUVA(254), and spectral slopes. The second contains data on concentrations of total, dissolved and particulate iron fractions in 2018 samples from 19 high-CDOM sites (lakes and rivers) in the NLF ecoregion of northern Minnesota plus vertical profile information on a(440), dissolved iron, light penetration, and basic limnological parameters in three NLF lakes with widely varying a(440) levels. The third file contains a(440) and dissolved iron concentrations for six lakes from a laboratory experiment in which known amounts of dissolved iron were added to water samples from six water bodies with a wide range of a(440) levels plus additional spectral absorbance information from the samples.These files contain the raw field and lab data collected during sampling of lakes and a few rivers in 2014-2016 to evaluate the importance of dissolved iron concentrations in affecting apparent levels of colored dissolved organic matter (CDOM), as measured spectrophotometrically by light absorption coefficient at 440 nm, a(440), with additional sampling in 2018 for more specific purposes. Approximately 450 sets of measurements were made on 280 lakes/rivers during the field seasons of 2014-2016, with most of the sampling in two ecoregions of Minnesota -- the Northern Lakes and Forests (NLF) and the North Central Hardwood Forests (NCHF). Additional samples collected in these two ecoregions in neighboring Wisconsin and Michigan in 2016 and in the Northern Minnesota Wetlands (NMW) ecoregion of Minnesota also are in the database. Data collected in 2018 included depth profiles of a(440), iron, dissolved organic carbon (DOC), and basic water quality parameters on three NLF lakes and samples on about 20 colored lakes and rivers to evaluate the importance of particulate iron as a component of total iron. Experimental data for addition of dissolved iron (Fe(III)) to six lakes also is included.National Science Foundation, Legislative-Citizen Commission on Minnesota Resources, University of MinnesotaBrezonik, Patrick L; Finlay, Jacques C; Hozalski, Raymond M. (2019). Effect of dissolved iron on CDOM and other optical properties for dissolved organic matter in lakes and rivers of the Upper Great Lakes states. Retrieved from the University Digital Conservancy, https://doi.org/10.13020/kk4m-zx88
Detecting phosphorus release from stormwater ponds to guide management and design
No full textMinnesota Stormwater Research Council, Water Resources Center, University of MinnesotaJanke, Benjamin D.; Natarajan, Poornima; Shrestha, Paliza; Taguchi, Vinicius T.; Finlay, Jacques C.; Gulliver, John S.. (2021). Detecting phosphorus release from stormwater ponds to guide management and design. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/218852
Combined UMN-MPCA 2014-2017 lake data on Secchi depth, CDOM, Chlorophyll and total suspended solids
No full textThe data are in an Excel spreadsheet with rows representing data for a given lake collected on a specific date. Columns provide lake name or unique lake identifier, sampling date, aquatic ecoregion for the lake, results for CDOM (a440), chlorophyll, Secchi depth, and total suspended solids concentrations, and logarithms of the values for the four water quality variables.This file contains approximately 1460 records on four water quality variables measured on near-surface water samples of lakes in Minnesota (primarily) and also in Wisconsin and Michigan collected by our research group from 2014 to 2017 and similar data collected by the Minnesota Pollution Control Agency in its annual lake water quality assessment program from 2015 to 2017. The variables are Secchi depth (SD), colored dissolved organic matter (CDOM) measured as the Napierian light absorption coefficient at 440 nm, chlorophyll-a, and total suspended solids concentrations. The database was used for a published paper to analyze the effects of CDOM on SD and show that high CDOM levels limit light penetration and thus SD in colored lakes.National Science Foundation, Legislative-Citizen Commission on Minnesota Resources, University of MinnesotaBrezonik, Patrick L; Hozalski, Raymond M.; Finlay, Jacques C. (2019). Combined UMN-MPCA 2014-2017 lake data on Secchi depth, CDOM, Chlorophyll and total suspended solids. Retrieved from the University Digital Conservancy, https://doi.org/10.13020/01WT-JG66
Wet Pond Maintenance for Phosphorus Retention: LRRB 2019 KB 03 MnDOT Agreement No. 1034035
No full textMinnesota Department of TransportationTaguchi, Vinicius J.; Janke, Benjamin D.; Herb, William R.; Gulliver, John S.; Finlay, Jacques C.; Natarajan, Poornima. (2022). Wet Pond Maintenance for Phosphorus Retention: LRRB 2019 KB 03 MnDOT Agreement No. 1034035. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/227893
Enhancement and Validation of a Stormwater Pond Assessment Tool
No full textThe Pond Assessment Tool (beta version) is a spreadsheet-based tool that was originally developed for the evaluation and management of stormwater ponds, as part of the Janke et al. (2023) study assessing phosphorus retention in stormwater ponds and wetlands treating stormwater runoff. The Tool was developed to provide pond managers with a toolbox to evaluate ponds in a straightforward and inexpensive manner. The Tool can perform screening and assessment of stormwater ponds at risk of poor phosphorus performance using readily available spatial, water quality, and pond data, thereby providing a low-cost method for assessing a large number of stormwater ponds for phosphorus water quality functionality. The original version of the Tool, however, was not validated.
The primary objective of this project was to update and validate the original version of the Pond assessment Tool, so that conditions indicative of poor phosphorus retention in ponds, i.e., high TP, low dissolved oxygen, and high sediment phosphorus release, could be evaluatedWater Resources Center and the Minnesota Stormwater Research CouncilNatarajan, Poornima; Janke, Benjamin D.; Finlay, Jacques C.. (2025). Enhancement and Validation of a Stormwater Pond Assessment Tool. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/273518
Can We Tell Stories Out of Our Memories? The Contributions of Derrida and Benjamin
No full textThe author draws from Jacques Derrida’s and Walter Benjamin’s writings on
memory in order to argue that as these two thinkers deal with the simultaneity
of the diachronic and synchronic dimension of time they open up the
possibility of thinking about the relation between memory and narrative in a
more complex way. These two theorists affirm the discontinuity and the nonrecognition
between past events and present discourses and show the danger of
conflating memory and narrative without the awareness of its limits
Data for: Internal Loading in Stormwater Ponds as a Phosphorus Source to Downstream Waters
No full textThis dataset supports the journal article "Internal Loading in Stormwater Ponds as a Phosphorus Source to Downstream Waters" by Taguchi et al. (Submitted).
Included are water quality field data, laboratory sediment phosphorus release experiment data, and laboratory sediment phosphorus fractionation data.
This work is licensed under a Creative Commons Attribution 4.0 International License.
The RPBCWD 98-Pond Dataset was produced by the Riley Purgatory Bluff Creek Watershed District and not the dataset authors. Contact www.RPBCWD.org for further information.Stormwater ponds remove phosphorus through sedimentation before releasing captured water downstream. Internal loading can impair net phosphorus removal but is understudied in these highly modified systems. Using a combination of methods, we assessed the prevalence and potential causes of sediment phosphorus release in urban ponds. In a three-year, 98-pond dataset, nearly 40% of ponds had median water column total phosphorus concentrations exceeding the 95% confidence interval for runoff values (0.38 mg/L), suggesting widespread internal loading. In a subsequent intensive monitoring study of four ponds, strong stratification prevented spring and summer diurnal mixing, resulting in persistent hypolimnion anoxia (<1 mg/L dissolved oxygen). Incubated sediment cores from seven ponds demonstrated high anoxic phosphorus release. Sediment analysis revealed high labile organic and redox-sensitive phosphorus fractions with release potential at anoxia onset. Our analyses suggest phosphorus accumulated in stormwater ponds is highly sensitive to internal loading, reducing net removal and contributing to downstream eutrophication.Minnesota Pollution Control AgencyNational Science Foundation (grant number 00039202)Taguchi, Vinicius J; Olsen, Tyler A; Natarajan, Poornima; Janke, Benjamin D; Gulliver, John S; Finlay, Jacques C; Stefan, Heinz G. (2019). Data for: Internal Loading in Stormwater Ponds as a Phosphorus Source to Downstream Waters. Retrieved from the University Digital Conservancy, https://doi.org/10.13020/p338-vx49
Stormwater Pond Maintenance, and Wetland Management for Phosphorus Retention
No full textReduction in phosphorus is critical because phosphate, a dissolved form of phosphorus, sustains algal and cyanobacteria growth and causes a wide range of water-quality impairments in the ponds and downstream waters including algal blooms, excess floating plants, taste, and odor problems. Many stormwater ponds and wetlands that treat stormwater appear to be less effective than expected or originally intended in phosphorus retention, a key function of these ponds in urban environments. There is evidence that many old ponds are releasing phosphorus from bottom sediments at high rates and likely exporting phosphorus to downstream surface water bodies. A major outcome of this project is a pond Assessment Tool to assess the risk of high phosphorus concentrations in ponds and sediment release of phosphorus. The tool is based on 20 ponds with detailed water quality and phosphorus release measurements and a meta-analysis of 230 ponds in the Twin Cities metro area. Other outcomes included a working definition of a constructed stormwater pond and a wetland treating stormwater in the framework of water-body regulations, the development of recommendations for stormwater pond maintenance and wetland management, and an update to the sections on the constructed stormwater ponds section of the 2009 Stormwater Maintenance BMP Guide.Janke, Benjamin D.; Natarajan, Poornima; Gulliver, John S.; Finlay, Jacques C.. (2023). Stormwater Pond Maintenance, and Wetland Management for Phosphorus Retention. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/257259
Relationality, polemics, incommensurability: thinking the political at the intersections of the work of Jacques Derrida and Michel Foucault
No full textPhDThis thesis is focused on the intersections of ontology and politics in the work of Michel
Foucault and Jacques Derrida. In particular it concerns the ways in which these two thinkers
offer accounts of (ethical, social, political) relations which exceed a traditional dichotomy
between transcendentalism and empiricism. Both Derrida and Foucault show universal
foundations to originate in an anterior play of differences 'between' the transcendental and
empirical. However, as this thesis shows, each thinks this anterior 'medium' of relations in
radically incommensurable ways: as differance or aporia in Derrida and as power and
problematization in Foucault. As such, each necessarily views the other as failing to account
for the ‘true medium’ of relationality and so of its violent effacement and disavowal. This
incommensurability, it is argued, results in a polemic between them which is explicit in their
competing accounts of Descartes’ Meditations and implicit throughout all of their work. This
thesis traces the polemic between Derrida and Foucault across their accounts of subjectivity,
ethics and politics. It is argued that in their engagements with each of these fields they
employ parallel politicizing strategies which are nevertheless wholly exclusive of one another.
The incommensurability between Derrida and Foucault reflects a broader problematic
which any political thought affirming its own finitude cannot explicitly recognize. Postfoundational
accounts of relationality, it is claimed, violently exclude competing
philosophical strategies without the capacity of accounting for this exclusion
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