The Experts below are selected from a list of 229074 Experts worldwide ranked by ideXlab platform
Ameur Trad - One of the best experts on this subject based on the ideXlab platform.
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determination of the optimum design through different funding scenarios for future parabolic Trough solar power plant in algeria
Energy Conversion and Management, 2015Co-Authors: Ameur TradAbstract:Abstract The purpose of this study is to determine an optimum design for a projected parabolic Trough solar power plant (PTSPP) under Algerian climate through different funding scenarios. In this paper, seven different (d1–d7) designs for PTSPP have been developed for the Naâma site. Plant size, technology type, storage capacity, location of the plant, Operation & Maintenance (O&M) costs, replacement costs, fuel consumption, net CO 2 emission, levelized electricity cost, net power generation, specific investment costs and discount rate are the basis factors to determine the optimum sustainable design for PTSPP. The most attractive designs of each base technology were selected as D1, D2 and D3. The preferable design of three funding scenarios was finally selected on economic, financial and sensitivity analysis. It is finally concluded that, under the most favorable economic conditions allowed in this study, design D3 is the most advantageous in terms of benefit to cost ratio: its power output will be 100 MW el with 8 full load hours thermal energy storage. It was also found that for design D3 under funding scenario S2, the project will require an upfront grant of 396 MEUR. This corresponds to around 56% of the total investment cost and the payback period will be approximately 7 years.
Julian A Dowdeswell - One of the best experts on this subject based on the ideXlab platform.
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The physiography of High Arctic cross-shelf Troughs
Quaternary Science Reviews, 2014Co-Authors: Christine Batchelor, Julian A DowdeswellAbstract:Abstract A comprehensive inventory of High Arctic cross-shelf Troughs is compiled from International Bathymetric Chart of the Arctic Ocean (IBCAO) bathymetric data (v. 3.0). The location of 75 cross-shelf Troughs is presented alongside a synthesis of their key physiographic characteristics and available glacial-geological evidence. The Troughs are interpreted to have been occupied intermittently and eroded by marine-terminating ice streams that traversed the shelf during at least one, and often many Quaternary full-glacial periods. Considerable variation in cross-shelf Trough physiography exists in the High Arctic; Trough lengths range between 35 and 1400 km, widths from 12 to 260 km, and maximum depths from 200 to 1000 m. The longest cross-shelf Troughs extend through inter-island channels on the Beaufort Sea, Queen Elizabeth Islands and Barents–Kara Sea margins. The gradient of the upper-slope beyond High Arctic glacial Troughs, which ranges between 0.3° and 13°, is shown to have a negative relationship with palaeo-ice stream drainage basin area and Trough length. Glacial-sedimentary depocentres or Trough-mouth fans (TMFs) are inferred on the basis of bathymetric and, where available, seismic evidence, to exist beyond the majority of High Arctic cross-shelf Troughs. Evidence of shelf progradation or TMF development is absent from the slope beyond several High Arctic Troughs, probably as a result of limited sediment supply to the margin and/or sediment by-passing of the upper-slope. On the South Greenland continental margin, it is likely that steep slopes prevented the development of significant glacial-sedimentary depocentres beyond cross-shelf Troughs or that glacigenic debris has been removed from the upper-slope by submarine slope failure.
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late quaternary ice flow and sediment delivery through hinlopen Trough northern svalbard margin submarine landforms and depositional fan
Marine Geology, 2011Co-Authors: C L Batchelor, Julian A Dowdeswell, K A HoganAbstract:Abstract The morphology and distribution of submarine landforms in Hinlopen Trough, Northern Svalbard margin, and the upper continental slope beyond, are investigated using swath-bathymetric data, together with side-scan sonar, acoustic profiler records and sediment cores. Sun-illuminated images reveal a number of landform assemblages on the sea floor of Hinlopen Trough and confirm that this depression was occupied by an ice stream during the Late Weichselian glaciation around 20 ka before present. The geomorphology of the inner-shelf is characterised by bedrock drumlins and ice-sculpted bedrock. There is a middle-shelf transition from a rock bed to an unconsolidated sedimentary bed that contains highly-attenuated drumlins and megaflutes formed within a dark grey, matrix-supported diamict, interpreted as subglacial till. Outer-shelf landforms are mainly iceberg ploughmarks. The geomorphological imprint identified from Hinlopen Trough is similar to that of many former ice streams; the Trough is dominated by elongate landforms orientated parallel to the inferred flow direction and is lacking in transverse features indicative of inter-ice stream locations. A characteristic down-flow progression in landform elongation is also observed, suggesting an increase in ice velocity across the continental shelf. The lack of grounding-zone features imaged from swath-bathymetric data implies that deglaciation was probably rapid within the Trough. A large depositional fan exists on the upper continental slope beyond the Trough, characterised by debris flow deposits relating to the down-slope transport of glacigenic sediment. Order of magnitude calculations of the volume of glacigenic sediment on the continental slope indicate that the ice stream provided high rates of debris delivery of around 5–7.5 m/ka. This suggests that Hinlopen Trough ice stream represented a major route for the transfer of ice and debris to the Hinlopen Fan on the northern continental margin of Svalbard during the Late Weichselian glaciation.
Harald Gjosaeter - One of the best experts on this subject based on the ideXlab platform.
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productive detours atlantic water inflow and acoustic backscatter in the major Troughs along the svalbard shelf
Progress in Oceanography, 2020Co-Authors: Sebastian Menze, Randi Ingvaldsen, Anna Nikolopoulos, Tore Hattermann, Jon Albretsen, Harald GjosaeterAbstract:Abstract Atlantic Water (AW) flowing along the western and northern Svalbard shelf-break extends the Atlantic domain into the Arctic and is the region’s major source of heat, nutrients and advected plankton. We investigated the inflow and recirculation of AW into four major Troughs that cut into the Svalbard shelf, the Isfjorden, Kongsfjorden, Hinlopen and Kvitoya Troughs, and related the circulation patterns to acoustic backscatter observed with echosounders and Acoustic Doppler Current Profilers. The acoustic observations showed higher levels of backscatter from fish in the Hinlopen Trough compared to the shelf and shelf-break north of Svalbard. This coincides with a steady inflow of nutrients, biomass and heat into the Trough with the AW. Trough circulation was characterized using output from a high-resolution regional ocean model and particle tracking simulations. All four Troughs experience topographically steered recirculation (in-and-outflow) of AW, but the Troughs on the western Svalbard shelf showed a stronger seasonality than the Troughs on the northern shelf. The Hinlopen Trough receives the strongest AW inflow and the most direct inflow from the shelf-break boundary current. The Troughs form hybrid habitats between the shelf and shelf-break that extend the Atlantic advective domain closer to the Svalbard coastline.
Tore Hattermann - One of the best experts on this subject based on the ideXlab platform.
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productive detours atlantic water inflow and acoustic backscatter in the major Troughs along the svalbard shelf
Progress in Oceanography, 2020Co-Authors: Sebastian Menze, Randi Ingvaldsen, Anna Nikolopoulos, Tore Hattermann, Jon Albretsen, Harald GjosaeterAbstract:Abstract Atlantic Water (AW) flowing along the western and northern Svalbard shelf-break extends the Atlantic domain into the Arctic and is the region’s major source of heat, nutrients and advected plankton. We investigated the inflow and recirculation of AW into four major Troughs that cut into the Svalbard shelf, the Isfjorden, Kongsfjorden, Hinlopen and Kvitoya Troughs, and related the circulation patterns to acoustic backscatter observed with echosounders and Acoustic Doppler Current Profilers. The acoustic observations showed higher levels of backscatter from fish in the Hinlopen Trough compared to the shelf and shelf-break north of Svalbard. This coincides with a steady inflow of nutrients, biomass and heat into the Trough with the AW. Trough circulation was characterized using output from a high-resolution regional ocean model and particle tracking simulations. All four Troughs experience topographically steered recirculation (in-and-outflow) of AW, but the Troughs on the western Svalbard shelf showed a stronger seasonality than the Troughs on the northern shelf. The Hinlopen Trough receives the strongest AW inflow and the most direct inflow from the shelf-break boundary current. The Troughs form hybrid habitats between the shelf and shelf-break that extend the Atlantic advective domain closer to the Svalbard coastline.
Elliot Cohen - One of the best experts on this subject based on the ideXlab platform.
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life cycle greenhouse gas emissions of Trough and tower concentrating solar power electricity generation systematic review and harmonization
Journal of Industrial Ecology, 2012Co-Authors: John J Burkhardt, Garvin Heath, Elliot CohenAbstract:Summary In reviewing life cycle assessment (LCA) literature of utility-scale concentrating solar power (CSP) systems, this analysis focuses on reducing variability and clarifying the central tendency of published estimates of life cycle greenhouse gas (GHG) emissions through a metaanalytical process called harmonization. From 125 references reviewed, 10 produced 36 independent GHG emissions estimates passing screens for quality and relevance: 19 for parabolic Trough (Trough) technology and 17 for power tower (tower) technology. The interquartile range (IQR) of published estimates for Troughs and towers were 83 and 20 grams of carbon dioxide equivalent per kilowatt-hour (g CO2-eq/kWh), 1 respectively; median estimates were 26 and 38 g CO2-eq/kWh for Trough and tower, respectively. Two levels of harmonization were applied. Light harmonization reduced variability in published estimates by using consistent values for key parameters pertaining to plant design and performance. The IQR and median were reduced by 87% and 17%, respectively, for Troughs. For towers, the IQR and median decreased by 33% and 38%, respectively. Next, five Trough LCAs reporting detailed life cycle inventories were identified. The variability and central tendency of their estimates are reduced by 91% and 81%, respectively, after light harmonization. By harmonizing these five estimates to consistent values for global warming intensities of materials and expanding system boundaries to consistently include electricity and auxiliary natural gas combustion, variability is reduced by an additional 32% while central tendency increases by 8%. These harmonized values provide useful starting points for policy makers in evaluating life cycle GHG emissions from CSP projects without the requirement to conduct a full LCA for each new project.
