Theses and Dissertations at Montana State University (MSU)
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Item Hydraulics, hydrology, and resulting fish passage at the Huntley Diversion Nature-like Bypass(Montana State University - Bozeman, College of Engineering, 2020) Tupen, Haley Noel; Chairperson, Graduate Committee: Kathryn PlymesserDams and other instream structures have been constructed for hundreds of years in the United States for various purposes; these dams have the potential to 'disconnect' rivers and negatively impact fish upstream and downstream movement. Nature-like bypasses were created to facilitate movement around these structures and provide passage to a wide variety of morphologically different fish species. The Huntley Diversion Dam nature-like bypass was constructed in 2015 on the Yellowstone River, but its effectiveness has not yet been evaluated. This project aimed to evaluate its efficacy through monitoring and determining water stage, flow rates, channel roughness, and a detailed channel bathymetry. These data were then used in the creation of multiple two-dimensional hydraulic models encompassing the nature-like bypass channel and surrounding Yellowstone River area. Velocity results from these models were compared to species-specific swimming capabilities from literature for four Yellowstone River species. Additionally, hydraulics at the downstream bypass entrance were evaluated for disorienting hydraulic formations that might prevent fish from locating the bypass entrance. Velocity results indicate Sauger (Sander canadensis) may successfully ascend the bypass on all but five days of the modeled hydrograph and may face occasional difficulty in returning to their pre-spawning upstream habitat. Burbot (Lota lota), Channel Catfish (Ictalurus punctatus), and Smallmouth Bass (Micropterus dolomieu) are unlikely to successfully ascend the bypass for much of May, June, and July. This holds significant implications for Channel Catfish and Smallmouth Bass, both of which move upstream to spawn in the months of May and June. Hydraulics at the downstream end of the bypass indicate high attraction at high flows, but that lower flows are likely to create disorienting hydraulic characteristics at this bypass entrance and lead to low fish attraction.Item Effects of hydraulic loading on nitrification and denitrification processes in a two-stage, vertical flow treatment wetland at Bridger Bowl Ski Area(Montana State University - Bozeman, College of Engineering, 2020) Panighetti, Robert Arthur; Chairperson, Graduate Committee: Otto SteinA pilot-scale two-stage vertical flow treatment wetland (VFTW) at the Bridger Bowl Ski Area was used to evaluate the influence of hydraulic loading rate on COD removal, nitrification, and denitrification in the system. Hydraulic loading rates ranged between 36 cm/d to 60 cm/d over system years 2018 and 2019. Total nitrogen loading (sum of NH 4+ and NO 3-) ranged from 12 g/m 2d to 65 g/m 2d, and COD loading ranged from 58 g/m 2d to 172 g/m 2d. The system effectively removed COD in both years, with removals of 95% and 96% for influent COD concentrations of 555 mg/L and 607 mg/L, respectively. Influent total nitrogen was 141 mg/L in 2018 and 105 mg/L in 2019, and removals were 67% and 54%, respectively. At a hydraulic loading rate of 60 cm/d, COD removal declined in the first stage and ammonium removal declined in the second stage. At lower hydraulic loading rates (up to 48 cm/d), removal of COD, ammonium and nitrate increased in a consistent pattern with increased mass loading of the respective contaminant, suggesting a maximum hydraulic loading rate limit between 48 and 60 cm/d. The effect of hydraulic loading cannot be completely separated from mass loading of a contaminant, likely influenced by the level of partial saturation within the first stage and the recycle ratio; neither were varied in this study. A key limiting factor is hydraulic overload to the first stage, limiting removal of COD which interfered with nitrification in the second stage. A multivariate model for ammonium removal in the second stage predicts increased ammonium removal with increasing ammonium load but decreasing COD load. Despite operational performance variation the system met applicable discharge requirements, reinforcing the ability of a VFTW system to perform secondary wastewater treatment, even for high-strength wastewater and in cold climates.Item Designing and assessing the effectiveness of Denil fishways using hydraulic modeling-based approaches(Montana State University - Bozeman, College of Engineering, 2019) Platt, Nolan Chalmers; Chairperson, Graduate Committee: Kathryn Plymesser; Matt Blank, Kathryn Plymesser, Kevin Kappenman and Joel Cahoon were co-authors of the article, 'Modeling upstream arctic grayling passage through Denil fishways in the Big Hole Valley, Montana' submitted to the journal 'The journal of ecohydraulics' which is contained within this thesis.; Matt Blank, Kathryn Plymesser, Kevin Kappenman and Joel Cahoon were co-authors of the article, 'Hydraulic design of a Denil fishway at pin-and-plank irrigation diversions: a technical report' submitted to the journal 'A technical report' which is contained within this thesis.Man-made, instream structures can pose barriers to fish movement. Fish move about river systems to reach habitats associated with various stages of their life histories. If access to required habitat is blocked, it can cause detrimental effects to fish populations. Removing barriers to fish movement is often socio-economically infeasible so fishways are used to promote fish passage around barriers. Denil fishways consist of a chute for water to flow through and baffles to slow water velocities; they are a relatively cheap solution for promoting upstream fish passage over low-head barriers. The Big Hole River basin is home to the last fluvial population of Arctic Grayling in the continental United States. Per an agreement between landowners and several government organizations, Denil fishways were installed at irrigation diversions in the Big Hole Valley to provide fish volitional routes to navigate irrigation diversions. Eleven Denil fishways at irrigation diversions were evaluated for their effectiveness at passing grayling by using hydraulic modeling techniques coupled with biologic data. Hydrologic data was applied to hydraulic models to estimate water surface elevations about the Denils over time. A passage index was developed which inferred passage efficiency of the fishway based on depths at the upstream and downstream ends and assigning a 'passage condition.' Passage windows were developed which describe times when the fishways functioned to 'allow', 'limit', or 'prevent' upstream passage. Across all sites fishways were predicted to 'allow' passage 6.4% of the time, 'limit' passage 17.2% of the time, and 'prevent' passage 10.3% of the time. The modelled depth combination at fishways was 'out of range' of the passage index 66.1% of the time. A hydraulic design process was proposed with the goal of designing Denil fishways at pin-and-plank irrigation diversions to promote upstream passage at low flows. Design criteria were established, explained, and presented. One-dimensional hydraulic modeling techniques for diversions and fishways was presented and used to determine design parameter values that optimize fish passage efficiency over a broad range of instream flows. We attempted to develop a novel method of assessing Denil structures using hydraulic models; our method is useful to managers because the effectiveness of fishways was assessed by considering how they functioned over a range of instream flows and at times associated with fish movement.Item Turbulent rapid mixing in direct filtration(Montana State University - Bozeman, College of Engineering, 1983) Trusler, Scott LeeItem Empirical velocity predictions at culvert inlets(Montana State University - Bozeman, College of Engineering, 2006) Patton, Jesse Earl; Chairperson, Graduate Committee: Joel CahoonThe velocity distribution at the entrance cross section of a culvert is typically diverse, reflecting the nuances of the bed material, debris and other hydraulic factors just upstream of the culvert. These diverse inlet velocity fields have been observed to perpetuate some distance into the culvert, impacting the ability of fish to travel upstream in the culvert barrel. It is important to be able to quantitatively describe the inlet velocity field, especially as this serves as a necessary boundary condition for three-dimensional modeling of fluid flow in culverts. While there are various theory-based models of velocity distributions in open channels, velocity distributions at culvert inlets tend to be chaotic and are not well represented by analytic methods. The goal of this project was to use field data collected at existing culverts to estimate the density at which velocity observations should be collected to adequately describe the nature of the velocity at the culvert inlet. Two methods of data analysis were utilized to determine the required density of velocity observations. The first approach randomly selected velocities to be used as predictors and did not stress the location of the predictors, but instead emphasized the number of velocity observations needed to describe the nature of the velocity at the culvert inlet. The second method employed the idea that the location of the predictors was more important than quantity of predictors used. Results indicate that the pattern of velocity measurements is important - that is, velocities should not be measured at randomly selected positions in the cross section, but should follow a geometric pattern where the measurement density increases in zones having larger velocities. Also, it appears that if one follows the rigorous implementation of the USGS method for measuring stream flow (often referred to as the velocity-area method in texts), velocity predictions can be extrapolated using the inverse-distance-squared technique to adequately describe the inlet velocity field. The implication of this research is that there are steps that can be followed to adequately describe the nature of the velocity at culvert inlet even through the velocity distributions are chaotic in these regions.