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Relevant bibliographies by topics / Roughness coefficient n

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Journal articles
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Academic literature on the topic 'Roughness coefficient n'

Author: Grafiati

Published: 4 June 2021

Last updated: 8 February 2022

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Journal articles on the topic "Roughness coefficient n"

1

Ye, Aizhong, Zheng Zhou, Jinjun You, Feng Ma, and Qingyun Duan. "Dynamic Manning's roughness coefficients for hydrological modelling in basins." Hydrology Research 49, no. 5 (2018): 1379–95. http://dx.doi.org/10.2166/nh.2018.175.

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Abstract Manning's roughness coefficient (n) has a significant impact on routing in hydrological models. However, computational methods for dynamic roughness coefficients are of little concern in current research. Few studies have produced spatial-temporal distributions of the roughness coefficients in basins. In this study, a formula to calculate the n value was established based on a statistical analysis of estimated n values by Manning's formula. The routing model of a distributed hydrological model was then improved using the new formula to calculate n. The roughness coefficient is not a c

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Sadeh, Yuval, Hai Cohen, Shimrit Maman, and Dan Blumberg. "Evaluation of Manning’s n Roughness Coefficient in Arid Environments by Using SAR Backscatter." Remote Sensing 10, no. 10 (2018): 1505. http://dx.doi.org/10.3390/rs10101505.

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The prediction of arid region flash floods (magnitude and frequency) is essential to ensure the safety of human life and infrastructures and is commonly based on hydrological models. Traditionally, catchment characteristics are extracted using point-based measurements. A considerable improvement of point-based observations is offered by remote sensing technologies, which enables the determination of continuous spatial hydrological parameters and variables, such as surface roughness, which significantly influence runoff velocity and depth. Hydrological models commonly express the surface roughn

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Leitans, A., J. Lungevics, J. Rudzitis, and A. Filipovs. "Tribological Properties of PVD Ti/C-N Nanocoatnigs." Latvian Journal of Physics and Technical Sciences 54, no. 2 (2017): 64–71. http://dx.doi.org/10.1515/lpts-2017-0014.

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Abstract The present paper discusses and analyses tribological properties of various coatings that increase surface wear resistance. Four Ti/C-N nanocoatings with different coating deposition settings are analysed. Tribological and metrological tests on the samples are performed: 2D and 3D parameters of the surface roughness are measured with modern profilometer, and friction coefficient is measured with CSM Instruments equipment. Roughness parameters Ra, Sa, Sz, Str, Sds, Vmp, Vmc and friction coefficient at 6N load are determined during the experiment. The examined samples have many pores, w

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Zhu, Xinghua, Bangxiao Liu, and Yue Liu. "New Method for Estimating Roughness Coefficient for Debris Flows." Water 12, no. 9 (2020): 2341. http://dx.doi.org/10.3390/w12092341.

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Flow resistance is a fundamental control of flow hydraulics in streams and rivers. In this paper, five dimensionless factors affecting the Manning roughness coefficient n and attributed to the external roughness coefficient n1 and the internal roughness coefficient n2 were analyzed comprehensively. And then, dimensionless factors affecting n1 and n2 with precise physical meanings were proposed. With a calculation method for roughness coefficient fitted and analyzed based on observation data from published research papers, the analysis results showed that the external resistance coefficient is

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Lau, T. W., and N. R. Afshar. "Effect of Roughness on Discharge." Journal of Civil Engineering, Science and Technology 4, no. 3 (2013): 29–33. http://dx.doi.org/10.33736/jcest.124.2013.

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These Water resource projects and hydraulic engineering works have been developing rapidly throughout the world, thus prediction of water roughness coefficient is becoming an importance criteria for the designs of hydraulic related structure like open channel, and dam structure. The purposes of this research are to determine the effect of roughness on discharge and study on the factors that affect roughness coefficient. The roughness coefficient for this study is expressed in terms of Manning’s n. Experimental works were carried out to study the effect of roughness by using flumes (8m x 0.3m x

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Li, Yujian, Yixin Geng, and Liang Mao. "Calibration method for Manning's roughness coefficient for a river flume model." Water Supply 20, no. 8 (2020): 3597–603. http://dx.doi.org/10.2166/ws.2020.235.

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Abstract This paper takes the Tarim River as an example to study the selection of Manning's roughness coefficient (n) in numerical simulation and presents a new method for calibrating Manning's roughness coefficient of a flume model. The measured topographic data and hydraulic data obtained from the flume experiments are taken as the initial boundary conditions in flow simulation, and n value for a flume model of the Qiman reach of Tarim River is calibrated by using a CCHE2D model. The consistency between the simulated water surface and the measured water surface with different n value is comp

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Hadi Sahib, Jumana, ., and . "Prediction the Manning’s Coefficient by HEC-RAS for Al-Meshkab River." International Journal of Engineering & Technology 7, no. 4.37 (2018): 76. http://dx.doi.org/10.14419/ijet.v7i4.37.23620.

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The Manning's coefficient represents the roughness characteristics of the channel, which directly affects open channel calculations. In this study, it been calculated which estimation of Manning's coefficient (n) by some of the collected data .The remaining data is utilized for check of the model testing with actual data, which is called verification. The model was adopted by a one-dimensional mathematical by using the HEC-RAS program. The region was studied at the upstream of the Al-Meshkab Barrage, where data were collected in 2010. The coefficient of Manning's roughness (n) is given well ag

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Ma, Jing, and Ling Qiang Yang. "Manning’s N Value of Bridge-in-Backpack." Applied Mechanics and Materials 638-640 (September 2014): 965–68. http://dx.doi.org/10.4028/www.scientific.net/amm.638-640.965.

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Bridge-in-a-Backpack is a new type bridge. this study will investigate the interaction of flow under the bridge with the tubes and decking, and recommend Manning’s roughness coefficient for water flow under the composite backbridge system.

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HAMZAH, ESAH, ALI OURDJINI, MUBARAK ALI, PARVEZ AKHTER, MOHD RADZI HJ. MOHD TOFF, and MANSOR ABDUL HAMID. "INFLUENCE OF NITROGEN FLOW RATE ON FRICTION COEFFICIENT AND SURFACE ROUGHNESS OF TiN COATINGS DEPOSITED ON TOOL STEEL USING ARC METHOD." Surface Review and Letters 14, no. 05 (2007): 1007–13. http://dx.doi.org/10.1142/s0218625x07010408.

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In the present study, the effect of various N 2 gas flow rates on friction coefficient and surface roughness of TiN -coated D2 tool steel was examined by a commercially available cathodic arc physical vapor deposition (CAPVD) technique. A Pin-on-Disc test was carried out to study the Coefficient of friction (COF) versus sliding distance. A surface roughness tester measured the surface roughness parameters. The minimum values for the COF and surface roughness were recorded at a N 2 gas flow rate of 200 sccm. The increase in the COF and surface roughness at a N 2 gas flow rate of 100 sccm was ma

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Wu, Xuesong, and Ming Dong. "A local scattering theory for the effects of isolated roughness on boundary-layer instability and transition: transmission coefficient as an eigenvalue." Journal of Fluid Mechanics 794 (March 30, 2016): 68–108. http://dx.doi.org/10.1017/jfm.2016.125.

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This paper is concerned with the rather broad issue of the impact of abrupt changes (such as isolated roughness, gaps and local suctions) on boundary-layer transition. To fix the idea, we consider the influence of a two-dimensional localized hump (or indentation) on an oncoming Tollmien–Schlichting (T–S) wave. We show that when the length scale of the former is comparable with the characteristic wavelength of the latter, the key physical mechanism to affect transition is through scattering of T–S waves by the roughness-induced mean-flow distortion. An appropriate mathematical theory, consistin

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Dissertations / Theses on the topic "Roughness coefficient n"

1

Mangin, Steven F. "Development of an Equation Independent of Manning's Coefficient n for Depth Prediction in Partially-Filled Circular Culverts." Youngstown State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1284488143.

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Tkáč, Matěj. "Úprava toku – Luha v Jeseníku n/Odrou." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2013. http://www.nusl.cz/ntk/nusl-226142.

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The object of this Master`s thesis is the river training of the Luha river in Jeseník nad Odrou. The thesis is divided into several chapters. In the theoretical introduction, the problems of the sediment flow regime are discussed. Moreover, it deals with the questions associated with the roughness in open channels and adjustment of riparian zones. As a part of the overall proposal of the flow adjustment, the hydraulically most suitable cross section in cunette is proposed. It is done with respect to the desired velocity ratios in the profile. Since the new cunette shape was established, the ad

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Conference papers on the topic "Roughness coefficient n"

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Li, Lanlan, Shiqiang Liang, Dawei Tang, and Liang Chen. "Visualization Study of Dropwise Condensation on a Super-Hydrophobic Surface." In ASME 2013 11th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/icnmm2013-73046.

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Compared with conventional filmwise condensation, dropwise condensation has the advantage of high heat transfer coefficient when properly enhanced. To better understand the inherent mechanism of this outstanding performance and optimize the structure of the condensation surface, this paper focuses on the visualization experiments of dropwise condensation on a superhydrophobic surface to study the dynamic behaviors of droplet nucleation and growth. The surface is fabricated by chemically growing an n-octadecanethiol self-assembled monolayer coating with microscopic roughness on a copper surface

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Drees, Dirk, and Satish Achanta. "Investigation of Friction Over a Wide Range of Normal Forces." In ASME/STLE 2007 International Joint Tribology Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ijtc2007-44082.

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Friction at different force, length, and time scales is of great interest in tribology. The mechanical, chemical, and physical (atomic) interactions, each operating at their own time length and force scale, makes friction complex. This work is an attempt to improve the understanding of friction at normal forces ranging from nN up to N. This investigation was carried out under reciprocating ball-on-flat sliding conditions on engineering surfaces like diamond-like carbon (DLC) and dual phase steel. The test equipments used for this investigation are an atomic force microscope, a microtribometer,

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Yousif, B. F., Nirmal Singh Gill, Saijod T. W. Lau, and Alvin Devadas. "The Potential of Using Betelnut Fibres for Tribo-Polyester Composites Considering Three Different Orientations." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-68648.

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This paper presents an attempt to use betelnut fibres as reinforcement for tribo-polyester composites in bearing applications. The composite was fabricated using the hand lay-up technique, and contains 15 layers of randomly distributed chopped fibres and 17 layers of polyester. The adhesive wear and frictional behavior of the composites were studied against a polished stainless steel counterface using block-on-disc (BOD) machine at different applied loads (5–30N) and sliding distance (0–7km). In addition to that, the orientation of the fibre layers with respect to the sliding direction of the

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Li, Zhuo, Gui-Hua Tang, Ya-Ling He, and Wen-Quan Tao. "Numerical Investigation of EDL Effects on the Flow Characters of Polar Fluids in Rectangular Microchannels." In ASME 4th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2006. http://dx.doi.org/10.1115/icnmm2006-96073.

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Recently, a large number of experiments have been conducted to examine the applicability of Navier-Stokes equations to predict the friction factor for the laminar flow of polar fluids in microchannels. However, significant discrepancies still exist between various results. In order to investigate the effect of electric double layer on the pressure-driven flow of polar fluid in smooth rectangular microchannels and to reveal whether continuum model can still be applied, numerical investigations are conducted in this paper. The simulated microchannels are made of silicon engraved substrate with P

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