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- Journal Article:
Anyi and Kirke
This paper reviews works involving small axial flow hydrokinetic turbines specifically for generating electrical power for off-grid remote communities and suggests improvements to overcome a major problem. Turbines mounted on pontoons or suspended using pivot arms from river banks or from jetties are reported able to produce about 1 kW to 2 kW of electrical power suitable for remote homes.…
- Thesis:
Gordelier
Wave energy generation is a promising renewable energy source but it faces certain challenges before it can become commercially viable. In comparison to conventional energy generation it is expensive, furthermore it has been plagued by reliability challenges due to the harsh operating demands of the marine environment. This Thesis investigates the reliability of wave energy devices, and…
- Report:
Kasper et al.
Debris in rivers and along coastlines occurs frequently. However very little quantitative information is available on the size, location, dynamics and most importantly the risk debris poses to river and marine energy converters. This report reviews techniques and instruments for quantifying debris, its potential for damaging marine hydrokinetic infrastructure and technologies that may be…
- Report:
Wilson
Tidal and river energy converters can be placed in regions with marine traffic and also floating debris. This introduces significant challenges for the structural and mooring design of these systems to handle both tug and barge towline snag and dynamic impact loading from logs, ice, or other debris.
Dynamics Systems Analysis Ltd (DSA) was tasked with assessing debris impact loads and…
- Report:
Johnson et al.
The Tanana River hydrokinetic characterization study started in 2009, when little was known about how river environments in Alaska would affect hydrokinetic power generating devices or how those devices might affect the state’s river environments. Few hydrokinetic devices were beyond the concept/design stage, and a first attempt at demonstrating a hydrokinetic device at Ruby, Alaska, had just…
- Report:
Schmid
One of the challenges of generating electrical energy with a hydrokinetic turbine in Alaska rivers is the detrimental effect of woody debris in the water column. In order to mitigate this problem the questions of describing what types of debris might be encountered, the frequency of occurrence, the force of impact, and location in the water column need to be answered. The University of Alaska…
- Report:
Tyler
Perhaps the greatest obstacle that confronts the implementation of commercial-scale hydrokinetic devices in rivers is debris. Until recently, this problem has been largely avoided by installing devices in areas where debris is not a factor. This practice significantly limits the possible locations for deployment, however, so new techniques must be developed. Although there is little precedent…
- Conference Paper:
Johnson et al.
During summer 2014, the Alaska Hydrokinetic Energy Research Center (AHERC) and OCEANA Energy Company (OCEANA) conducted performance tests on OCEANA’s river energy converter (REC) at the Tanana River Test Site (TRTS). OCEANA’s REC was deployed from AHERC’s test barge moored immediately downstream from AHERC’s research debris diversion platform (RDDP), which was moored to a midstream buoy…
- Report:
Johnson et al.
The research debris diversion platform (RDDP) has proven a robust platform for protecting surface-mounted river energy converters (RECs) from floating debris.With funding from the Alaska Energy Authority (AEA), grant ADN #R1416 “Debris Characterization and Mitigation,” the design of the RDDP, as well as our ability to detect and understand its use with RECs, was significantly improved. In…
- Report:
Johnson et al.
In spring 2010, Alaska Power and Telephone (AP&T) deployed a 25 kW New Energy Corporation EnCurrent hydrokinetic turbine in the Yukon River at Eagle, Alaska, to determine the feasibility of using river in-stream energy conversion (RISEC) devices to supply power to remote communities. The turbine was deployed on a floating platform and operated successfully until problems with surface and…
- Presentation:
Duvoy et al.
We introduce a methodology for a comprehensive characterization of river flows from transects surveyed at different times over near coincident transects from acoustic Doppler current profiler (ADCP) data acquired from a moving vessel.
The ADCP measurements are first rotated from East and North velocities into primary and secondary flows that are projected onto a grid of points on an…
- Presentation:
Gunawan et al.
Although hydrokinetic turbines offer many benefits their installation and operation also present challenges. Similar to other riverine structures, a key issue facing the hydrokinetic structures is the trapping of sediment and debris (organic and non-organic). This issue impacts the financial feasibility of projects as well as posing environmental concerns. The trapping of sediment and debris…
- Journal Article:
Song et al.
Sediment erosion is a negative phenomenon for the water turbine. The purpose of this paper is to study the effect of the guide vane opening on the particle motion and sediment erosion in the band chamber using the Euler–Lagrangian approach. The software Ansys CFX and Tabakoff erosion model are used to simulate the sediment laden flow in the full flow passage of the hydraulic turbine. The…
- Conference Paper:
Cornett et al.
The potential for dangerous interactions with floating debris is a leading consideration when evaluating potential sites for deployment of hydrokinetic power systems, yet to date, relatively little research effort has been directed towards developing and proving effective devices and systems for protecting turbines from floating debris.
This paper presents and discusses results from a…
- Conference Paper:
Shiekh Elsouk et al.
In the past few years, tidal turbines have been developed to exploit the kinetic energy of seawater currents to generate electrical energy. The blade is the more critical part of the tidal turbines. It is designed according to hydrodynamic science in order to capture the maximum energy from marine currents and supposed to withstand the environment marine conditions for long periods. The…
- Conference Paper:
Lekube et al.
Wave Energy Converters (WECs) need to operate in a harsh environment, where fatigue in materials and salt accumulation regularly lead to premature failures of components. In the course of seven years of continuous operation of the Mutriku Wave Power Plant, several events of this kind have occurred and are described in detail in this article. Preventive maintenance is conducted regularly in the…
- Report:
Johnson and Pride
This report outlines the status of hydrokinetic power generation technology, the expected trajectory of improvement over the next five years, and recommended actions the state can take to accelerate this technology field. The report is based on numerous sources as well as data collected by ACEP over the past year at a hydrokinetic research site in Nenana, Alaska.
Turbines placed…
- Journal Article:
Larimer et al.
The accumulation of bacteria in surface-attached biofilms can be detrimental to human health, dental hygiene, and many industrial processes. Natural biofilms are soft and often transparent, and they have heterogeneous biological composition and structure over micro- and macroscales. As a result, it is challenging to quantify the spatial distribution and overall intensity of biofilms. In this…
- Journal Article:
Tsuanyo et al.
Hydropower plants are among the most efficient and reliable renewable energy systems in the world as far as electricity production is concerned. Run-of-river hydropower plants seem more attractive than conventional hydroelectric plants since they can be a cheaper and environmentally friendly alternative. However, their expected energy production pattern heavily depends on several construction…
- Journal Article:
Chee,S. et al.
Localized corrosion of Cu and Al thin films exposed to aqueous NaCl solutions was studied using liquid cell transmission electron microscopy (LCTEM). We demonstrate that potentiostatic control can be used to initiate pitting and that local compositional changes, due to focused ion beam implantation of Au+ ions, can modify the corrosion susceptibility of Al films.
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