Gotowe bibliografie tematyczne / CHANNEL SLOPE

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Gotowa bibliografia na temat „CHANNEL SLOPE”

Autor: Grafiati

Data publikacji: 11 września 2023

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Artykuły w czasopismach na temat "CHANNEL SLOPE"

Zhang, Zhiming, Sai Wu, Huimin Miao i Tong Zhang. "Numerical Investigation of Flow Channel Design and Tapered Slope Effects on PEM Fuel Cell Performance". Sustainability 14, nr 18 (6.09.2022): 11167. http://dx.doi.org/10.3390/su141811167.

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High-power proton exchange membrane (PEM) fuel cell vehicles are important for the realization of carbon neutrality in transportation. However, it is difficult to maintain enough fuel supply and quick water removal capacity at a high current density where reactant gas transportation and water concentration are directly affected by flow channel configurations. This study aims to investigate the tapered slope effects of a flow channel on fuel cell performance using a 3-D CFD model. The positive, negative, zero and hybrid tapered slopes are proposed to illustrate the fuel cell voltage, reactant gas and water vapor concentration in the flow channels. Among them, the flow channel with a positive tapered slope performs better, especially at a high current density. Then, the positive tapered slope effects are discussed, including different tapered slopes, inlet depths and widths of flow channels. The results show that the larger the tapered slope, the smaller the depth and width, and the better the fuel cell performs; the corresponding current densities are increased by a maximum of 6.53%, 12.72% and 61.13%. The outcomes stated above provide a key direction for flow channel design that can particularly achieve higher fuel cell power density at high current densities.

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Debabeche, Mahmoud, Sonia Cherhabil, Amin Hafnaoui i Bachir Achour. "Hydraulic jump in a sloped triangular channel". Canadian Journal of Civil Engineering 36, nr 4 (kwiecień 2009): 655–58. http://dx.doi.org/10.1139/l08-136.

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The hydraulic jump in a sloped triangular channel of 90° central angle is theoretically and experimentally examined. The study aims to determine the effect of the channel's slope on the sequent depth ratio of the jump. A theoretical relation is proposed for the inflow Froude number as function of the sequent depth ratio and the channel slope. An experimental analysis is also proposed to find a better formulation of the obtained relation. For this motive, six positive slopes are tested. The relations obtained are recommended for designing irrigation ditches.

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Moldamuratov, Zh N., A. A. Iglikov, E. B. Madaliyeva, S. Zh Daurbekova i A. Sh Asylbekov. "CROSS-SECTION CHANNELS OF HYDRAULICALLY AND STATICALLY STABLE SHAPE". Bulletin of Kazakh Leading Academy of Architecture and Construction 86, nr 4 (15.12.2022): 199–209. http://dx.doi.org/10.51488/1680-080x/2022.4-20.

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The article presents the results of research on the substantiation of giving a stable shape of cross-section to the channels of hydro-reclamation systems of southern Kazakhstan. The calculations on the stability of irrigation channel slopes were made, as well as their design features and practical substantiation of stable profiles were presented. The shapes of stable slope were determined using of actual values of geotechnical parameters of slope soils. The results showed that the slope profile takes a stable shape during the channel operation, close to the parabolic.

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Huyghe, Pascale, Michel Foata, Eric Deville, Georges Mascle i Caramba Working Group. "Channel profiles through the active thrust front of the southern Barbados prism". Geology 32, nr 5 (1.05.2004): 429–32. http://dx.doi.org/10.1130/g20000.1.

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Abstract Submarine channels of the Orinoco River were analyzed using high-quality, dense- coverage bathymetric and seismic data provided by a recent marine survey on the southern Barbados prism. Analysis of the syntectonic sediments on seismic profiles shows that the four to five frontmost structures show evidence of recent tectonic movement. Slope analysis of the major channels was performed. From their headwaters to domains of little or no active tectonics, the channels display <0.2% slope and form levees. Slope and incision increase gradually in domains of moderate tectonics, but deep canyons with ∼2% mean slope form where the channels cross the active frontal folds of the prism. Detailed correlation between the active structures, their geometry, and canyon slope suggest that systematic variations in channel gradient highlight variations in substrate uplift rate. Steep slopes induced by uplift accelerate sediment flow and enhance incision. Nonetheless, such slope analysis is subject to complications introduced by variations in sediment flux and transient erosional conditions.

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Li, Guang Ming, Chun Yuan Liu i Pei Chen. "Study on the Channel Slope Safe Stability". Applied Mechanics and Materials 256-259 (grudzień 2012): 311–14. http://dx.doi.org/10.4028/www.scientific.net/amm.256-259.311.

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It is well known that the slope stability analysis is the core of the slope engineering study .The key of the study slope safety stability is optimize the slop coefficient。And the reasonable coefficient decides the design of slope type structure.This paper used the simplified Bishop method which according to the limit equilibrium theory as the foundation and the finite element numerical simulation to solve the south-to-north water transfer engineering slope instability problem.So it can provide the theory basis and design opinion for the slop construction engineering in the future.

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Locat, Jacques, Ali Azizian, Jim Stronach, Aurélien Hospital, Chris Young, Dominique Turmel i Andrew Bevan. "Morphological signature of gully development by rapid slide retrogression in a layered coarse-grained delta foreslope". Geological Society, London, Special Publications 500, nr 1 (2020): 219–34. http://dx.doi.org/10.1144/sp500-2019-159.

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AbstractCoarse-grained deltas are often characterized by steep foreslopes (often more than 10°) that are traversed by delta-front channels. The channels thus erode into relatively steeply inclined bedding. In this context, the slopes flanking the channels can be steeper than the friction angle since they include a component of dip related to the delta-front slope as well as the channel-related erosion slope. In this study, part of the Busu River delta (Papua New Guinea) was imaged using a high-resolution multibeam bathymetry survey over an area where the angle of the slopes flanking the channels locally reaches 50°. A detailed analysis of the delta slope morphology has revealed an additional source of instability due to erosion within the main channels. In some places, erosion cuts into the channel flank forming a local knickpoint inclined in a direction approaching that of the bed dip. The cut can then initiate breaching or static liquefaction failure from that point up to the crest of the interfluve resulting in a V-shaped gully.

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Sümeghy, Borbála, i Tímea Kiss. "Morphological and hydrological characteristics of paleo-channels on the alluvial fan of the Maros River, Hungary". Journal of Environmental Geography 5, nr 1-4 (2.01.2012): 11–19. http://dx.doi.org/10.14232/jengeo-2012-43803.

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The aim of our research was to identify and map the paleo-channel systems on the alluvial fan of the Maros River and to analyse their spatial characteristics. The study on flow directions, horizontal channel parameters and paleo-discharge of the channels can help to forecast the maximum flood discharge and channel changes influenced by climate variations. The paleo-channel generations on the Maros alluvial fan form 13 zones with well defined boundaries. These zones can be either dominated by meandering (5), braided (2), or the mixture of meandering and braided patterns (3). The remaining three paleo-channel zones exhibit an anastomosing pattern but they were not analysed in this study. The horizontal morphological parameters of the braided, the meandering and the misfit channels were measured. Based on these morphometric parameters and regional discharge equations the bankfull discharge of the meandering zones was calculated. The greatest discharge was around 2655 m3/s while the smallest was 27 m3/s in case of a misfit paleo-channel. Based on the slope conditions the alluvial fan was divided into three parts. The greatest slope (31.0 cm/km) was found in the central part of the alluvial fan, whilst slightly lower slopes (23.8 cm/km and 24.9 cm/km) characterise its axial and distal parts. These parameters refer to a normal radial profile of an alluvial fan. The channel pattern changes are in close relation with differences in slope. This is the most obvious in zone No. IX, where braided channels transform into meandering and then braided again from east to west in accordance with slope conditions.

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Harishidayat, Dicky, i Wasif Rehman Raja. "Quantitative Seismic Geomorphology of Four Different Types of the Continental Slope Channel Complexes in the Canterbury Basin, New Zealand". Applied Sciences 12, nr 9 (26.04.2022): 4386. http://dx.doi.org/10.3390/app12094386.

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Modern marine seismic reflection data have allowed for the study of the morphology of submarine channels in a 3D perspective. This study presents a quantitative analysis of continental slope channel complexes morphology within the Canterbury Basin (New Zealand). It aims to characterize the morphology and seismic facies of submarine channels to better understand their formative sedimentary processes, paleoenvironment, and petroleum prospectivity. Submarine channel morphometric parameters are measured at 150 m intervals perpendicular to the axis of channels complexes. Based on the morphology analysis of erosional surfaces and seismic facies of channel complexes filling deposits, four types of continental slope channel complexes are found in the study area. These are vertical migrating channels, lateral migrating channels, V-shaped channels, and U-shaped channels. Furthermore, our work shows that channel morphometry varies over distances of 0.1 to 14 km in this continental slope system. These changes indicate a combination of submarine gravity flow process and channel wall collapse responsible for the development of continental slope channel complexes. Regionally, the evolution of the channels indicated less significant regional plate movement. This quantitative seismic geomorphology approach of characterizing submarine channels system has broader applications for better interpretation of paleoenvironment and petroleum prospectivity within frontier basins.

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Lee, Kyutae, Ali R. Firoozfar i Marian Muste. "Technical Note: Monitoring of unsteady open channel flows using the continuous slope-area method". Hydrology and Earth System Sciences 21, nr 3 (30.03.2017): 1863–74. http://dx.doi.org/10.5194/hess-21-1863-2017.

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Abstract. The advent of low-cost pressure transducers capable of directly measuring water surface elevation enables continuous measurements of dynamic water surface slopes. This opens up a new possibility of dynamically monitoring unsteady flows (i.e., hysteresis) during the course of flood wave propagation. Hysteresis in this context refers to a looped stage–discharge rating caused by unsteadiness of flows. Hysteresis is monitored in this study using a continuous slope area (CSA) method, which uses Manning's equation to calculate unsteady discharges based on continuously measured water surface slopes. In the rising stage, water surface slopes become steeper than a steady water surface slope, resulting in higher discharges than steady-based discharges, while the trends are reversed in the falling stage. The CSA method applied to Clear Creek near Oxford (Iowa, USA) estimates the maximum differences of peak discharges by 30–40 %, while it shows sound agreements for a low to medium range of discharges against USGS steady-based records. The primary cause of these differences is the use of a single channel bed slope in deriving Manning's roughness coefficients. The use of a single channel bed slope (conceptually equal to the water surface slopes at every stage in uniform flow conditions) causes substantial errors in estimating the channel roughness, specifically at high stages, because non-uniformities of natural channels result in varying (non-uniform) steady water surface slopes at each stage. While the CSA method is promising for dynamically tracking unsteady water surface slopes and flows in natural streams, more studies are still needed to increase the accuracy of the CSA method in future research.

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Jiongxin, Xu. "Channel pattern discrimination based on the relationship between channel slope and width". Zeitschrift für Geomorphologie 48, nr 3 (29.09.2004): 391–401. http://dx.doi.org/10.1127/zfg/48/2004/391.

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Rozprawy doktorskie na temat "CHANNEL SLOPE"

Fitton, Timothy, i tfitton@hotmail com. "Tailings beach slope prediction". RMIT University. Civil, Environmental and Chemical Engineering, 2007. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080212.120813.

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Tailings (mining waste) disposal is a significant consideration for the mining industry, with the majority of the ore processed in most mining operations ending up as tailings. This creates large volumes of tailings, which must be handled and stored responsibly to avoid potential environmental catastrophes. The most common form of tailings storage facility is the impoundment, where tailings are contained within a basin, with beaches forming around the perimeter of the impoundment and a pond standing in the middle. A relatively new method of tailings storage is to create a 'stack', whereby the tailings solids form a large heap, with the discharge of tailings slurry from the apex of the heap. It is of significant value for mine operators and tailings engineers to be able to predict the shape of the beach that forms in either of these disposal scenarios. The key to being able to do this relies on a method of prediction of the beach slope. The aim of this work is to develop a method of tailings beach slope prediction for tailings slurries that are sub-aerially discharged from a pipe. In this thesis a literature review is undertaken, investigating existing methods for the prediction of tailings beach slopes. These methods are validated against relevant industrial and experimental data. Two separate phases of experimental work have taken place in an effort to investigate tailings deposition behaviour, one at mine sites and the other in a laboratory on a small scale. Three new tailings beach slope prediction models are presented; a simple empirical model enabling quick approximate predictions; an a priori tailings beach slope prediction model based on existing theories of open channel flow, sediment transport and rheology, which is more powerful due to the greater degree of theory in its foundation; and a new semi-empirical model that shares some of the theoretical aspects of the a priori model but offers better predictions due to its empirical calibration to the experimental data. The experimental results, along with 3 other independently collected sets of relevant industrial and experimental data, are used to validate the beach slope prediction models found in the literature, as well as the new beach slope models presented in this thesis. Statistical evaluation of the performance of all of these models is presented to enable comparison. Finally, a new beach shape model is presented for the three dimensional geometric forecasting of the beach surface of a tailings stack. Historic tailings discharge data is run through the beach shape model, and the shapes predicted by the model are compared with aerial survey data of a real tailings stack for validation of the shape model. This work not only presents a new method of tailings stack shape prediction, but also a plausible theory for explaining the concavity of tailings beaches. The stack shape model also has the potential to be developed further for the three dimensional modelling of tailings beaches formed in other types of storage facilities, such as impoundments or valleys.

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Hall, Robert Alan. "Internal waves and slope mixing in the Faroe-Shetland Channel". Thesis, University of Liverpool, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.507197.

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Silva, Carlos Manuel de Assis. "Controls on slope channel-levee evolution in the Amazon fan". Thesis, University of Leeds, 2011. http://etheses.whiterose.ac.uk/4715/.

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Submarine channel-levee architecture is a result of interaction between turbiditic flows and the bathymetry that they encounter on the slope and that they themselves construct. However, the spatio-temporal evolution of channellevee systems, i.e., their manner of spatial accretion is not fully understood. In addition, the controls on the patterns of channel distribution and stacking remain relatively poorly understood. The results presented in this thesis are based on the interpretation of a 3D seismic survey located in water depths of about 1000 to 2000 m on the upper slope of the Amazon Fan. The analysis of the data includes two different approaches: on a larger scale, the interpretation of the tectono-stratigraphic analysis of the data; and on a smaller scale, the characterization of the evolution of the channel-levee systems and associated deposits. The methods of analysis used included the mapping of significant horizons and the extraction of sequences horizon slices across the channel-levee systems. The horizon slices allowed visualisation of the vertical distribution of the channel-levee elements and interpretation of their evolution. The seismic data can be divided in two main packages, separated by an unconformity. The pre-unconformity package is characterized by a predominant sub-parallel seismic facies (characterized by continuous, homogeneous and sub-parallel reflections), and is strongly folded and faulted due to gravity tectonics. In this interval, no channel-levee systems were identified, but canyonlike channels with dimensions as large as 2600 m wide and 220 m deep were observed. Conversely, the post-unconformity package comprises a heterogeneous arrangement of seismic facies, and is less strongly deformed. Three upslope-stacked channel-levee systems of Middle Pleistocene age can be distinguished in this interval. Each channel disperses obliquely down the slope, resulting in levee size asymmetry, with the downslope levee being of greatest size. The upslope stacking of channel-levee systems results from a sequence of avulsions on the upslope levees. Bathymetric influence of the older channel levee system is interpreted to dictate the slope-oblique orientation of the new channel. Two main architectural styles were identified, each one associated with different models of spatia-temporal development of channel-levees. A pattern of upstream accretion of the aggradational (channel-levee) component of the channel is associated with the channel narrowing and becoming more sinuous upward. This style is characterized by an onlapping pattern of channel and levee reflections. Downstream accretion of channel-levee is associated with a trend of channel widening and becoming less sinuous upwards. This style is characterized by a downlap pattern of the channel and levee reflections. Each style is related to different evolutionary histories of the turbidite flows and thalweg configuration in relation to the equilibrium profile. Three styles of channel distribution on slope can be distinguished: structurally controlled erosive channels, aggradational channels obliquely oriented to the slope and agradationally confined channels that are vertically stacked. The pre-unconformity erosive channels are diverted and possibly owe their erosive character to active anticlines that kept the paleo-slope above the equilibrium profile. The oblique direction of each channel in the postunconformity interval was inherited from the previous one in a sequence of upslope stacking after systematic avulsion through the left-hand levee. The vertical stacking of channel-levee elements is due to the confinement of the channel between the outsize downslope levee and an upslope anticline which inhibited avulsion in the area. It is probable that each stacked channel-levee element corresponds to a downstream channel avulsion. This study provided important information about the architecture and distribution of channels on the upper-slope of submarine fans subject to gravitational tectonics. Therefore, it can be used as an analogue and help the prediction of sand prone areas in other submarine fans which are not so well imaged.

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Zoh, Brice. "An Underwater Channel Model and Chirp Slope Keying Modulation Scheme Performance". ScholarWorks@UNO, 2010. http://scholarworks.uno.edu/td/1263.

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Chirp-Slope Keying (CSK) is a new and innovative digital modulation scheme for underwater data transmission. The underwater environment brings up several challenges to the manufacturing and operation of communication systems. This thesis shows through analysis and simulations the effectiveness of Chirp-Slope Keying (CSK) in providing a satisfying performance in underwater communication. The experiment consists of modulating a chirp slope by binary numbers (representing our data). '0' is represented by a linear- down chirp and '1' is represented by a linear-up chirp. The received data is first processed by a correlator receiver. Then, the detection of either binary symbol is obtained by the comparison to a threshold. Simulation results for numerous signal-to-noise ratios show that CSK provides satisfying performance for underwater data transmission. The Mississippi gulf coast shallow water Data collected from the National Oceanic and Atmospheric Administration (NOAA), (see appendix), allow us to accurately generate a laboratory model for the channel of interest.

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Hardbattle, Carol. "Slope-channel connectivity for fine sediment transport in river systems : a national perspective". Thesis, University of Exeter, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.410810.

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Li, Pan. "Architecture and sedimentology of slope channel fills : an outcrop- and subsurface-based study". Thesis, University of Aberdeen, 2017. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=231778.

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Slope channel systems represent significant but highly variable deep-water stratigraphic features and reservoir targets. Variations in architecture and component facies can take place along strike, depositional dip and stratigraphically. A better understanding of these variations permits improved sedimentological and architectural models. By integrating two outcrops (San Clemente, California and Baja California, Mexico) and one subsurface example (offshore Nile Delta), this study provides an opportunity to investigate cross-channel asymmetry, stratigraphic evolution and variability, vertical facies trends, and controls of slope channel systems. This study demonstrates that cross-channel asymmetry in facies and architecture is a lithology- and scale-independent feature, and preferentially occurs at channel bends and in the upper part of slope channel systems. Facies and architectural asymmetry are generally expressed as amalgamated, coarser-grained deposits displaced to the steeper channel edge (outer bend), and finer-grained deposits dominate towards the gentler channel edge (inner bend). A comparison of the systems exposed in Mexico and buried in the subsurface reveals a similar evolutionary trend, from initial sediment erosion/bypass, through early-stage laterally amalgamated channels, late-stage sinuous channels with levees/terraces, and final abandonment. However, pronounced variations exist in the late stage (e.g., presence or absence of lobes), and abandonment stage (e.g., presence or absence of MTDs plugging and channel avulsion). Additionally, for the first time, this study quantitatively demonstrates that early-stage and late-stage architectural elements are characterized by distinct patterns in preferred vertical facies transitions, based on Markov chain analysis of vertical successions. This study also suggests that both extrabasinal factors (e.g., relative sea-level) induced flow energy cycles and intrabasinal factors (e.g., folding and faulting, MTDs, channel bends) can exert a significant control on the architecture and/or evolution of slope channel systems.

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Ugueto, Lilian L. Navarro. "Depositional architecture and evolution of deep-water base-of-slope and slope channel complexes in a passive-margin setting: Isaac Formation, Windermere Supergroup (Neoproterozoic), southern Canadian Cordillera". Thesis, University of Ottawa (Canada), 2006. http://hdl.handle.net/10393/27278.

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The Isaac Formation in the Neoproterozoic Windermere Supergroup crops out in the Castle Creek South area (southwestern Canadian Cordillera) and consists of a more than 1.2 km-thick, laterally continuous slope deposit formed along the ancestral passive margin of western North America. Within the study area, six channel complex sets have been recognized, of which two, named informally Channels 1 and 3, are the focus of this study. Channel 1 exposes an oblique section of base-of-slope channel deposits, whereas Channel 3, at least in its lower part, is a flow-transverse section. Channels 1 and 3 are 200-300 m thick and laterally extend over 1.1 km, and were initiated following two major falls of relative sea level. Detailed relationships between the intrachannel facies, architecture and geometry within both complex sets indicates that each comprises several vertically-stacked channel complexes that locally are separated by thin-bedded, mudstone-dominated turbidites interpreted to represent channel-abandonment deposits. Each channel complex consists of several channel units, which, in turn, are composed of multiple channel fills. Channel fills are up to 30 m thick and show different infill geometries (amalgamated, semi-amalgamated or layered, non-amalgamated and accretionary), exhibiting systematic lateral changes in fill from channel axis to channel margin. Multistory and multilateral fills in Channels 1 and 3 record a complex repetitive history of channel incision/bypass, aggradation, deactivation, migration and reincision. These erosional and depositional episodes are the result of changes in the equilibrium channel profile, flow parameters, and/or eustatic fluctuations.

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Faulkenberry, Laura. "High-resolution seismic architecture of upper slope submarine channel and canyon systems : Gulf of Mexico and offshore Nigeria". Thesis, University of Leeds, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.411303.

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Anderson, Bryan James. "Evolution of coarse-grained, upper slope channel fairway deposits, Paleocene El Rosario Formation, San Carlos, Baja California, Mexico". Thesis, Montana State University, 2009. http://etd.lib.montana.edu/etd/2009/anderson/AndersonB1209.pdf.

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Grinyó, Andreu Jordi. "Ecological study of benthic communities in the continental shelf and upper slope in the Menorca Channel (North Western Mediterranean)". Doctoral thesis, Universitat Politècnica de Catalunya, 2016. http://hdl.handle.net/10803/403988.

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Technological development and increased availability of remotely operated vehicles and manned submersibles have significantly increased accessibility to deep environments revealing the presence of rich and diverse macrobenthic assemblages dominated by suspension feeders. These assemblages have been largely exposed to the impacts of fishing activities (especially bottom trawling) in the Mediterranean Sea. Consequently, it is currently urgent to increase knowledge on their distribution, as well as on the ecology and biology of the main species that constitute these macrobenthic assemblages in order to implement effective management and conservation measures. This thesis addressed the characterization of macrobenthic assemblages in the continental shelf and upper slope (40-360 m depth) of the Menorca Channel through a multidisciplinary approach at different ecological levels. Six macrobenthic assemblages mainly segregated by substrate and depth. Hard substrates hosted sponge grounds and coral gardens, whereas crinoid and brachiopod beds occurred on soft sediments. Highest diversity values were found in the shelf edge, probably as a consequence of the bottom heterogeneity and the constant hydrodynamic conditions. Gorgonians were one of the most important and diverse bioengineering organisms in the Menorca Channel, forming dense assemblages that extended over vast areas. Gorgonian assemblages on the continental shelf and upper slope were mostly monospecific, whereas shelf edge assemblages were highly multispecific. Small colonies were dominant throughout the studied bathymetric range, but in deeper environments intermediate and large colonies were more abundant. The good preservation state of most of the observed benthic assemblages and gorgonian populations is probably related to the low pressure of bottom trawling which is mostly concentrated in deeper areas of the continental slope. Paramuricea macrospina is the most abundant gorgonian species in the Menorca Channel. Throughout its distribution, three different chromatic forms were observed. Two forms occurred on the continental shelf, and a third occurred on the shelf edge. Colony shape, sclerite size and shape, and the genetic variability of mitochondrial markers were compared to elucidate if these chromatic forms represented different taxonomic units. Colony morphology barely changed among the three forms resulting as a high conservative character. Conversely, sclerite size and shape significantly differed amongst the three forms, possibly conditioned by genetic and environmental factors. However, no significant differences were observed in the studied mitochondrial markers. The reproductive cycle, energy storage and metabolic requirements of P. macrospina showed significant differences compared to Mediterranean coastal gorgonians. Its reproductive cycle was delayed 2¿3 months respect to shallow species, possibly following the late summer increase in seawater temperature occurring on the Mediterranean continental shelf. Moreover, internal brooding in P. macrospina contrasts with surface brooding in the congeneric Paramuricea clavata. Lipid content was lower and more constant in P.macrospina than in shallow species, and d13C and d15N composition showed almost no seasonal variation, suggesting that food availability in the continental shelf is lower but more constant than in shallower environments. The high oligotrophic conditions of the Balearic Sea apparently contrasts with the high abundance and diversity of active and passive suspension feeders observed in the Menorca Channel. Indeed, the downward particle fluxes quantified during two consecutive years in the Menorca Canyon were comparatively low within the Mediterranean context, reflecting the oligotrophic nature of the study area and the lack of continental inputs of particulate matter. Hydrodynamic settings and resuspenion appear to control TMF.
Les millores tecnològiques i la major disponibilitat de vehicles operats remotament i submains tripulats han incrementat l'accessibilitat a entorns profunds, revelant la presència associacions d'organismes bentòniques riques i diverses, dominades per suspensívors. Aquestes agregacions han estat altament impactades per la pesca al Mediterrani. És urgent incrementar el coneixement, sobre la distribució d'aquestes associacions i aspectes claus de la biologia i ecologia de les principals espècies que les constitueixen per tal d'establir mesures de conservació efectives. En aquesta tesi es caracteritzen les associacions bentòniques de la plataforma i talús continentals del Canal de Menorca a través d'una aproximació multidisciplinària a diferents nivells ecològics. S'han identificat sis associacions bentòniques diferents, que es diferencien principalment pel tipus de substrat i el rang batimètric. En els substrats durs s'hi ha trobat fons d'esponges i coralls, en els fons tous s'hi han trobat camps de crinoïdeus i braquiòpodes. Al marge continental s'hi concentren la diversitat més elevada, probablement resultant de l'heterogeneïtat ambiental i l'hidrodinamisme d'aquest entorn. Al Canal de Menorca les gorgònies són un dels organismes bioenginyers més importants i diversos, formant denses agregacions sobre amplies zones. Les agregacions de gorgònies a la plataforma i part superior del talús eren principalment monoespecífiques, mentre que les del marge continental eren multiespecífiques. Les colònies petites eren les més abundants al llarg de tot el rang batimètric. Tot i així, en entorns profunds les colònies mitjanes i grans incrementaven la seva abundància. El bon estat de les associacions bentòniques i les poblacions de gorgònies probablement resulta de la baixa pressió del ròssec, que es concentra a major fondària. Paramuricea macrospina és la gorgònia més abundant del Canal de Menorca. Al llarg de la seva distribució batimètrica es varen observar tres variants cromàtiques diferents. Dues es varen trobar a la plataforma i una tercera es trobà al marge continental. Per tal d'esbrinar si les diferents variants eren unitats taxonòmiques diferents s'han estudiat la forma colonial, la variabilitat de tamany i formes dels esclerits així com la variabilitat en marcadors mitocondrials. Es va detectar molt poca variabilitat en la morfologia colonial de les tres variants, suggerint que és un caràcter conservatiu. El tamany i la morfologia dels esclerits diferia significativament entre les tres variants, suggerint que estan influenciats per factors ambientals i genètics. No es varen trobar diferències entre els tres marcadors mitocondrials. S'ha avaluat el cicle reproductor, l'acúmul energètic i les necessitats metabòlics de P. macrospina. El cicle reproductiu d'aquesta espècia està retardat respecte les espècies de gorgònia mediterrànies somes. Aquesta situació podria sorgir de l'augment tardà de la temperatura de l'aigua a la plataforma continental mediterrània. El fet que P. macrospina sigui una internal brooder contrasta amb que Paramuricea clavata sigui una surface brooder. El contingut lipídic de P. macrospina és més baix però més constant que el d'espècies somes mediterrànies. D'altra banda la composició de la d13C i la d15N gairebé nos presentaven fluctuacions estacionals. Suggerint que la disponibilitat d'aliment a la plataforma és més baixa però més constant que en entorns somers. Al marge sud del Canal de Menorca hi trobem el Canyó de Menorca. Tot i l'elevada oligotròfia del mar Balear, les associacions d'organismes bentònics a la capçalera del canyó i proximitats són d'una elevada riquesa. S'ha avaluat el flux de partícules durant dos anys consecutius al canyó. Els fluxos recollits eren comparativament inferiors que els registrats en d'altres canyons mediterranis, reflectint la manca d'aportacions continentals. Els processos, de resuspensió i diferents paràmetres hidrodinàmics, semblen controlar el TMF.

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Książki na temat "CHANNEL SLOPE"

Wistuba, Małgorzata. Slope-Channel Coupling as a Factor in the Evolution of Mountains. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-05819-1.

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Chang, Tony H. D. Effects of interfacial level gradient and channel slope on interfacial shear stress in near-horizontal stratified gas-liquid flows. Ottawa: National Library of Canada, 1993.

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Limeburner, Richard. CTD observations in the Great South Channel during the South Channel Ocean Productivity Experiment, SLOPEX, May-June 1989. Woods Hole, Mass: Woods Hole Oceanographic Institution, 1989.

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Association, Portland Cement, red. Soil-cement for facing slopes and lining channels, reservoirs and lagoons. Skokie, Ill: Portland Cement Association, 1986.

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T, Chen Andrie, Leidersdorf Craig B i Technical Council on Cold Regions Engineering., red. Arctic coastal processes and slope protection design: A state of the practice report. New York, N.Y: American Society of Civil Engineers, 1988.

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Eash, David A. Main-channel slopes of selected streams in Iowa for estimation of flood-frequency discharges. Iowa City, Iowa: U.S. Dept. of the Interior, U.S. Geological Survey, 2003.

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Eash, David A. Main-channel slopes of selected streams in Iowa for estimation of flood-frequency discharges. Iowa City, Iowa: U.S. Dept. of the Interior, U.S. Geological Survey, 2003.

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Eash, David A. Main-channel slopes of selected streams in Iowa for estimation of flood-frequency discharges. Iowa City, Iowa: U.S. Dept. of the Interior, U.S. Geological Survey, 2003.

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Ndenecho, Emmanuel Neba. Landslide and torrent-channel problems of mountain slopes: Processes and management options for Bamenda Highlands. Bamenda, Cameroon: Unique Printers Bamenda, 2007.

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Trends and fluctuations in precipitation and stream runoff in the Queen Charlotte Islands. Victoria, B.C: Information Services Branch, Ministry of Forests, 1986.

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Części książek na temat "CHANNEL SLOPE"

Totani, G., P. Monaco, M. Leopardi, A. Farroni i A. Russo Spena. "Stabilization and geoenvironmental restoration of the main central channel in the Fucino plain, Italy – A case history". W Slope Stability Engineering, 965–70. London: Routledge, 2021. http://dx.doi.org/10.1201/9780203739600-56.

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Long, D., A. G. Stevenson, C. K. Wilson i J. Bulat. "Slope Failures in the Faroe — Shetland Channel". W Submarine Mass Movements and Their Consequences, 281–89. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-010-0093-2_31.

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Wilson, C. K., D. Long i J. Bulat. "The Afen Slide — A Multistaged Slope Failure in the Faroeshetland Channel". W Submarine Mass Movements and Their Consequences, 317–24. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-010-0093-2_35.

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Gubarkov, Anatoliy, i Marina Leibman. "Cryogenic Landslides in Paragenetic Complexes of Slope and Channel Processes in the Central Yamal Peninsula". W Landslide Science for a Safer Geoenvironment, 457–62. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-04996-0_70.

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Gubarkov, Anatoliy, Marina Leibman i Maria Andreeva. "Cryogenic Landslides in Paragenetic Complexes of Slope and Channel Processes in the Central Yamal Peninsula". W Landslides in Cold Regions in the Context of Climate Change, 291–308. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-00867-7_21.

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Holmes, R., J. Bulat, I. Hamilton i D. Long. "Morphology of an Ice-Sheet Limit and Constructional Glacially-Fed Slope Front, Faroe-Shetland Channel". W European Margin Sediment Dynamics, 149–52. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-642-55846-7_24.

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Carollo, F. G., C. Di Stefano, A. Nicosia, V. Palmeri, V. Pampalone i V. Ferro. "Testing the Effect of the Rill Channel Slope on the Correction Factor of Surface Velocity". W AIIA 2022: Biosystems Engineering Towards the Green Deal, 71–79. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-30329-6_7.

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Li, Yongkun, Rongfeng Zhou, Lu Li, Fan Xiao, Yehua Jiang i Dehong Lu. "Influence of Process Parameters by Enclosed Cooling Slope Channel on Microstructures of Semi-solid ZCuSn10P1 Alloy". W Lecture Notes in Mechanical Engineering, 583–94. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0107-0_55.

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Gasparini, Nicole M., Rafael L. Bras i Gregory E. Tucker. "Numerical Predictions of the Sensitivity of Grain Size and Channel Slope to an Increase in Precipitation". W River Confluences, Tributaries and the Fluvial Network, 367–94. Chichester, UK: John Wiley & Sons, Ltd, 2008. http://dx.doi.org/10.1002/9780470760383.ch17.

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Hill, Philip R. "Changes in Submarine Channel Morphology and Slope Sedimentation Patterns from Repeat Multibeam Surveys in the Fraser River Delta, Western Canada". W Sediments, Morphology and Sedimentary Processes on Continental Shelves, 47–69. Chichester, West Sussex, UK: John Wiley & Sons, Ltd, 2013. http://dx.doi.org/10.1002/9781118311172.ch3.

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Streszczenia konferencji na temat "CHANNEL SLOPE"

Shen, Minqi, i Anders Host-Madsen. "Wideband slope of interference channel: Finite bandwidth case". W 2011 49th Annual Allerton Conference on Communication, Control, and Computing (Allerton). IEEE, 2011. http://dx.doi.org/10.1109/allerton.2011.6120225.

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Samuel, A., A. Sharp, A. Sitta, J. Millington i T. Worku. "Deep Water Slope Channel Reservoirs from the Nile Delta, Egypt". W EAGE Conference on Geology and Petroleum Geology of the Mediterranean and Circum-Mediterranean Basins. European Association of Geoscientists & Engineers, 2000. http://dx.doi.org/10.3997/2214-4609.201406025.

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Zhang, Hongjie, i Ben Kneller. "Forward modeling of a deepwater slope channel system, Baja, California". W SEG Technical Program Expanded Abstracts 2013. Society of Exploration Geophysicists, 2013. http://dx.doi.org/10.1190/segam2013-1015.1.

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Lu, Xin, Guangming Lin i Jun Xu. "Slope Interpolation Tracing Channel Estimation Method for MIMO-OFDMA Systems". W 2009 IITA International Conference on Control, Automation and Systems Engineering, CASE 2009. IEEE, 2009. http://dx.doi.org/10.1109/case.2009.85.

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Wen-Hao Zhang, Zun-Cao Li, Yun-He Guan, Qi Xiong i Chuang Zheng. "Tunnel MOSFET with partial channel underlap exhibiting low subthreshold slope". W 2016 13th IEEE International Conference on Solid-State and Integrated Circuit Technology (ICSICT). IEEE, 2016. http://dx.doi.org/10.1109/icsict.2016.7998706.

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Soni, Kishan, Tom Manzocchi, Peter Haughton i Marcus Carneiro. "Hierarchical Characterization and Modelling of Deep-Water Slope Channel Reservoirs". W SPE Norway Subsurface Conference. Society of Petroleum Engineers, 2020. http://dx.doi.org/10.2118/200763-ms.

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CIARAVINO, CRISTIANO, i GIULIO CIARAVINO. "Operation of a Device Regulating Flow in a Steep Slope Channel". W Fourth International Conference on Advances in Civil, Structural and Environmental Engineering - ACSEE 2016. Institute of Research Engineers and Doctors, 2016. http://dx.doi.org/10.15224/978-1-63248-114-6-31.

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Feng, Xianjie. "The Multi-channel Dispersion and Dispersion Slope Compensation by the SNLCFBG". W 2009 International Conference on Networking and Digital Society (ICNDS). IEEE, 2009. http://dx.doi.org/10.1109/icnds.2009.127.

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Drum, Bruce. "Brightness estimation supports a two-channel model of achromatic brightness processing". W OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1986. http://dx.doi.org/10.1364/oam.1986.wt3.

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Brightness magnitude estimation functions for 3400° white circular increments on a 2700° white 38 cd/m2 background were measured on a modified Tubingen perimeter. The stimuli ranged from 1.7′ to 66′ in diameter, 0.07-1 s in duration, and 0° to 20° in eccentricity. Brightness estimates were obtained at 0.2 log unit luminance intervals from the increment threshold to 1600 cd/m2. A constant-luminance fixation target also served as a reference for the brightness estimates. Although the overall averages can be acceptably fit with power functions, most single-session functions are double-branched, in agreement with Hood and Finkelstein.1 A low-contrast branch first rises steeply with a slope ⪰1, but then asymptotes within 1–2 log units of threshold. A relatively straight high-contrast branch rises out of the low-branch asymptote, with a slope between 0.3 and 0.5. Changes of target size, duration, or eccentricity have little effect on the slope of the high-contrast branch. However, parameter changes that increase threshold can markedly shorten the range and increase the initial slope of the low-contrast branch. The properties of the low-contrast and high-contrast brightness branches are similar to those of the magnocellular and parvocellular retinogeniculate pathways and are consistent with existing brightness matching evidence for a two-channel model of achromatic brightness.2

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Guillaume, P., M. Reinier, G. Lambaré, A. Cavalié, M. I. Adamsen i B. M. Bruun. "Dip-constrained Non-linear Slope Tomography - an Application to Shallow Channel Characterization". W 75th EAGE Conference and Exhibition incorporating SPE EUROPEC 2013. Netherlands: EAGE Publications BV, 2013. http://dx.doi.org/10.3997/2214-4609.20130368.

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Raporty organizacyjne na temat "CHANNEL SLOPE"

Campbell, D. C., D. J. W. Piper, D. C. Mosher i K. A. Jenner. Sun-illuminated seafloor topography, Mohican channel, Scotian Slope, offshore Nova Scotia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2008. http://dx.doi.org/10.4095/225380.

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Conway, K. W., i J. V. Barrie. Large submarine slope failures and associated Quaternary faults in Douglas Channel, British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2015. http://dx.doi.org/10.4095/297316.

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Campbell, D. C., D. J. W. Piper, D. C. Mosher i K. A. Jenner. Surficial geology and sun-illuminated seafloor topography, Mohican channel, Scotian Slope, offshore Nova Scotia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2008. http://dx.doi.org/10.4095/225383.

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Miller, Sarah J., J. C. Fischenich i Christopher I. Thornton. Stability Thresholds and Performance Standards for Flexible Lining Materials in Channel and Slope Restoration Applications. Fort Belvoir, VA: Defense Technical Information Center, lipiec 2012. http://dx.doi.org/10.21236/ada577241.

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King, E. L., O. Brown, B. Chapman, G. Cameron, P. Fraser, P. Girouard, W. MacKinnon, D. Piper i M. Uyesugi. Hudson 2005023 cruise report: geological investigations in Northeast Channel and the adjacent slope, Scotian Shelf. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2005. http://dx.doi.org/10.4095/221515.

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Campbell, D. C., D. J. W. Piper, D. C. Mosher i K. A. Jenner. Seismic reflection profiles, Mohican channel, Verrill Canyon, and Logan Canyon, Scotian Slope, offshore Nova Scotia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2008. http://dx.doi.org/10.4095/225386.

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Conway, K. W., J. V. Barrie i R. E. Thomson. Submarine slope failures and tsunami hazard in coastal British Columbia: Douglas Channel and Kitimat Arm. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2012. http://dx.doi.org/10.4095/291732.

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Mosher, D. C., D. J. W. Piper, K. MacKillop i K. Jarrett. Near surface geology of the Halibut Channel region of the SW Newfoundland Slope from GSC data holdings. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2010. http://dx.doi.org/10.4095/261390.

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Sharp, Jeremy, Locke Williams, Duncan Bryant, Jake Allgeier, Kevin Pigg, Gary Bell i Dana Moses. Rough River Outlet Works physical model study. Engineer Research and Development Center (U.S.), czerwiec 2021. http://dx.doi.org/10.21079/11681/41043.

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The US Army Corps of Engineers, Louisville District, requested the support and assistance of the US Army Engineer Research and Development Center, Coastal and Hydraulics Laboratory (CHL), in the evaluation of the hydraulic performance of the replacement Outlet Works for Rough River Dam. To support the design effort, CHL constructed a 1:25.85 scale physical model. The proposed features of the model in the domain are the curved approach channel, intake structure, transition, curved conduit, stilling basin, concrete apron, and retreat channel. Tests performed to evaluate the hydraulic performance illuminated a few design concerns. To address these issues, several key design changes were made. These included the retreat channel slope, end sill design, and transition design.

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Haring, Christopher, i Michael Dougherty. Geomorphic metrics used in FluvialGeomorph. Engineer Research and Development Center (U.S.), sierpień 2023. http://dx.doi.org/10.21079/11681/47494.

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FluvialGeomorph (FG) is a geographic information system-based geomorphic analysis toolkit that analyzes high-resolution terrain data to provide river-reach assessments for watershed studies. This report demonstrates the utility of FG to identify physical stream channel characteristics that are used to determine channel stability. The FG toolbox is a remote-sensing approach based on lidar data, designed to measure channel, floodplain, valley, and watershed metrics necessary for watershed assessments. Currently, channel slope and cross-sectional analysis and planform metrics are being evaluated with existing lidar data from different hydrophysiographic regions within the United States. Recent study areas include the Northwest, Southwest, South, Midwest, and upper Midwest of the United States.

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