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Browsing by Author "Missaghi, Shahram"

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    Stormwater Research Roadmap for Minnesota
    Bilotta, John P.; Chapman, John; Baker, Lawrence; Missaghi, Shahram; Fairbairn, David; jbilotta@umn.edu; Bilotta, John; Water Resources Center; Department of Bioproducts and Bioengineering; Minnesota Pollution Control Agency; Minnesota Extension; Minnesota Sea Grant
    The goal of the Stormwater Research Roadmap is to articulate major research needs to improve stormwater management in Minnesota. Multiple sources and approaches were used to identify stormwater research needs for Minnesota, including a review of relevant stormwater-related documents, and state-wide survey of stormwater managers, focus groups, and policy actor interviews. The Stormwater Research Roadmap for Minnesota identifies eight major areas that need additional research to improve stormwater management for communities, professionals, and agencies. Specific examples are included for each. Research in these areas can lead to more innovative management techniques and increased effectiveness and efficiency to prevent, minimize, and mitigate the effects of runoff from the built environment. The Roadmap also presents criteria to rank research needs. Data for the Roadmap was collected from 2017-2018 and was published in 2018.
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    Three dimensional water quality modeling in a shallow lake with complex morphometry; implications for coolwater fish habitat under changing climate
    (2014-07) Missaghi, Shahram
    Morphologically complex lakes usually have a significant water quality heterogeneity and hydrodynamic gradients that require a three dimensional (3D) model to accurately capture their temporal and spatial dynamics. The objectives of this research were to evaluate and apply a 3D coupled hydrodynamic and ecological model to a morphologically complex lake and to investigate the effects of a changing climate on the lake ecosystem. The research was conducted in a series of four separate studies including modeling investigations and laboratory experiments. First, a 3D hydrodynamic model (ELCOM ) coupled with an ecological model (CAEDYM) was applied to three bays of the morphologically complex Lake Minnetonka, MN, to simulate water temperature, dissolved oxygen, total phosphorus, and algal concentrations. The 3D model was calibrated and validated in two different years, and model results compared well with extensive field data. Lake hydrodynamic and ecological processes were discovered to be sensitive to mixing due to inflow and wind variability over seasonal stratification. In the second study, two sensitivity and uncertainty analysis methods were applied to the model to evaluate uncertainties in the model predictions. The contributions of predicted water temperature, dissolved oxygen, total phosphorus, and algal biomass contributed 3, 13, 26, and 58% of total model output variance, respectively. A laboratory experiment was conducted to measure the influence of fluid motion on growth and vertical distribution of Microcystisin a Plankton Tower bioreactor. The laboratory results indicated that a depth-averaged energy dissipation rate in the range from 3 x 10-7 to 3 x 10-6 m2 s-3 facilitated Microcystis growth. Fourth, the applied calibrated and validated 3D model revealed the influence of local meteorological and global climate conditions on key water quality parameters and fish habitat in 3 bays of Lake Minnetonka. The research was conducted by simulating the model and analyzing the model output results under three climate scenarios of historical normal (HN), future (FU), and future extreme (FE). Water temperature (T) and dissolved oxygen (DO) concentrations were used to investigate the temporal and spatial variability of fish habitat dynamics. The epilimnetic water temperature of the FU and FE climate scenarios were up to 4 °C warmer than the HN scenario during ice-free seasons, stratification periods were predicated to expand up to 23% (46 days), and thermocline depth to increase 49% under the FE climate scenario. In all cases hypolimnion was mostly anoxic by June 15, but started by April 15, May 1, and May 15, under the three climate scenarios of HN, FU, and FE respectively. Under future scenarios the good growth, restricted growth and lethal coolwater fish habitats that were based on T and DO thresholds changed +16%, -18%, and +85% compared to the HN scenario. A modest change (8% of total lake volume) of good growth and restricted growth into lethal habitat separated the summer good growth coolwater fish habitat by over 3 weeks. The research brought out the need for a 3D analysis in capturing the significant water quality heterogeneities and the ecological hot spots in a morphologically complex lake.