Browsing by Author "Roberts, Jesse"

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    Field Measurement Test Plan to Determine Effects of Hydrokinetic Turbine Deployment on Canal Test Site in Yakima, WA, USA
    Gunawan, Budi; Neary, Vincent S.; Roberts, Jesse; Dallman, Ann; Grovue, Shane; Mortensen, Josh; Heiner, Bryan (2014-04)
    The primary goal of the Department of Energy’s Water Power Program is to efficiently develop and utilize the country’s marine hydrokinetic (MHK) and conventional hydropower (CH) resources. The program has recently identified the need to better understand the potential for hydrokinetic energy development within existing canal systems that may already have integrated CH plants. Hydrokinetic (HK) turbine operation can alter water surface elevations and modify the flow in a canal. Significant water level alterations and hydrodynamic energy losses are generally undesirable not only for CH plan operations, but also for irrigation and flood management operations. The goal of this study is to better understand the effect of operating individual and arrays of devices on local water operations through field measurements and numerical modeling. A methodology to study the effect of hydrokinetic turbine deployment in a test site in Roza Canal, Yakima, WA, is presented. The methodology comprises detailed water level and velocity measurements to characterize energy gradeline and inflow and wakeflow fields. Results from a preliminary testing are also discussed.
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    A Framework for Optimizing the Placement of Current Energy Converters
    Roberts, Jesse; Nelson, Kurt; Jones, Craig; James, Scott C. (2014-04)
    This study investigates the potential environmental impacts and performance of a small array of tidal energy converters (TECs) in Cobscook Bay, ME; TECs are a subset of current energy converters (CECs) that are specifically deployed in tidal channels. A previously constructed coarse-grid, regional-scale hydrodynamic model of Cobscook Bay was coupled to a refined domain centered on a proposed TEC deployment location. All models were developed with Sandia National Laboratories-Environmental Fluid Dynamics Code (SNL-EFDC). An optimization framework was then constructed that used results from the refined model to determine optimal device placement locations that maximize array performance and minimize potential environmental effects. Within the framework, environmental constraints can be included to limit CEC-induced changes in flow, sediment transport, or other physical phenomena that might affect the health of aquatic species (i.e., altering fish-swimming behavior and sediment-transport trends that could affect benthic habitat or the stability of the CEC infrastructure). Simulation results were compared between model runs with optimized array configurations, and the originally proposed deployment locations. The optimized array had roughly a 17% increase in power generation. The framework developed also provides regulators and developers with a tool to assess environmental impacts and device-performance parameters for the deployment of CEC devices.