Bibliografías temáticas / Bed roughness

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Literatura académica sobre el tema "Bed roughness"

Autor: Grafiati
Publicado: 1 de febrero de 2025
Última modificación: 31 de julio de 2025

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Artículos de revistas sobre el tema "Bed roughness"

1

Lang, Shinan, Ben Xu, Xiangbin Cui, et al. "A self-adaptive two-parameter method for characterizing roughness of multi-scale subglacial topography." Journal of Glaciology 67, no. 263 (2021): 560–68. http://dx.doi.org/10.1017/jog.2021.12.

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AbstractDuring the last few decades, bed-elevation profiles from radar sounders have been used to quantify bed roughness. Various methods have been employed, such as the ‘two-parameter’ technique that considers vertical and slope irregularities in topography, but they struggle to incorporate roughness at multiple spatial scales leading to a breakdown in their depiction of bed roughness where the relief is most complex. In this article, we describe a new algorithm, analogous to wavelet transformations, to quantify the bed roughness at multiple scales. The ‘Self-Adaptive Two-Parameter’ system ca
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2

Faruque, Md Abdullah Al, and Ram Balachandar. "Roughness effects on turbulence characteristics in an open channel flow." Canadian Journal of Civil Engineering 37, no. 12 (2010): 1600–1612. http://dx.doi.org/10.1139/l10-098.

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A comprehensive study was carried out to understand the effect of roughness on the turbulence characteristics of flow in an open channel. To this end, tests were conducted with four different types of bed surface conditions at two different Reynolds number (Re = 47 500 and 31 000). This includes the use of an impermeable smooth bed, impermeable rough bed, permeable sand bed, and an impermeable bed with distributed roughness. The roughness is generated using sand grains of median diameter 2.46 mm. The effect of bed roughness is seen to have penetrated through most of the flow depth, disputing t
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3

A.Merry, Marwa. "EXPERIMENTAL STUDY FOR DETERMINE MANNING'S COEFFICIENT WITH DIFFERENT SLOPES AND CHANNEL BED MATERIALS." Kufa Journal of Engineering 8, no. 3 (2017): 76–88. http://dx.doi.org/10.30572/2018/kje/8031160.

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Water resources and hydraulic engineering projects have been upward rapidly in all over the world, accordingly the prediction of roughness coefficient is essential criteria to design open channels, and related hydraulic structures. The aims of this research are to find out the effect of changing beds materials and discharge on coefficient of roughness (n), the beds that used in the tests are smooth which represented by original channel bed (steel plate), rough bed material which is a gravel bed and waved bed .The experimental work was performed in a rectangular flume with dimension of (15 m* 0
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4

Irzooki, Raad Hoobi, and Ayad Saoud Najem. "Experimental Investigation for Free Overfall of Flow in Semi-circular Channels." IOP Conference Series: Earth and Environmental Science 1120, no. 1 (2022): 012010. http://dx.doi.org/10.1088/1755-1315/1120/1/012010.

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Abstract In the present paper, the effects of diameter, bed slopes, and bed roughness on free overfall flow of semi-circular channels were investigated experimentally. For this purpose, three models of semi-circular channels with free overfall were built and installed in a 6m long laboratory flume. These three models were 250 cm long and had varying diameters 160, 200, and 250 mm. Four different bed slopes (S) were used in each of these models (0, 0.004, 0.008, and 0.012). For each bed slope, three sand particle sizes were used to roughen the bed (1.18mm, 2.36mm, and 4.75mm). For each model, t
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5

Majeed, Hayder Q., Ali M. Ghazal, and Basheer Al-Hadeethi. "Experimental and Numerical Study of Open Channel Flow with T-Section Artificial Bed Roughness." Mathematical Modelling of Engineering Problems 9, no. 6 (2022): 1589–95. http://dx.doi.org/10.18280/mmep.090619.

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Experimental and numerical studies have been conducted on the effects of bed roughness elements such as cubic and T-section elements that are regularly half-channel arrayed on one side of the river on turbulent flow characteristics and bed erosion downstream of the roughness elements. The experimental study has been done for two types of bed roughness elements (cubic and T-section shape) to study the effect of these elements on the velocity profile downstream the elements with respect to different water flow discharges and water depths. A comparison between the cubic and T-section artificial b
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6

Nikora, Vladimir I., Derek G. Goring, and Barry J. F. Biggs. "On gravel-bed roughness characterization." Water Resources Research 34, no. 3 (1998): 517–27. http://dx.doi.org/10.1029/97wr02886.

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FALCINI, FRANCESCA A. M., DAVID M. RIPPIN, MAARTEN KRABBENDAM, and KATHERINE A. SELBY. "Quantifying bed roughness beneath contemporary and palaeo-ice streams." Journal of Glaciology 64, no. 247 (2018): 822–34. http://dx.doi.org/10.1017/jog.2018.71.

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ABSTRACTBed roughness is an important control on ice-stream location and dynamics. The majority of previous bed roughness studies have been based on data derived from radio-echo sounding (RES) transects across Antarctica and Greenland. However, the wide spacing of RES transects means that the links between roughness and flow are poorly constrained. Here, we use Digital Terrain Model/bathymetry data from a well-preserved palaeo-ice stream to investigate basal controls on the behaviour of contemporary ice streams. Artificial transects were set up across the Minch Palaeo-Ice Stream (NW Scotland)
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8

Fredsøe, J., B. M. Sumer, T. S. Laursen, and C. Pedersen. "Experimental investigation of wave boundary layers with a sudden change in roughness." Journal of Fluid Mechanics 252 (July 1993): 117–45. http://dx.doi.org/10.1017/s0022112093003696.

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This study deals with turbulent oscillatory boundary-layer flows over a plane bed with a sudden spatial change in roughness. Two kinds of ‘change in the roughness’ were investigated: in one, the roughness changed from a smooth-wall roughness to a roughness equal to 4.8 mm, and in the other, it changed from a roughness equal to 0.35 mm to the same roughness as in the previous experiment (4.8 mm). The free-stream flow was a purely oscillating flow with sinusoidal velocity variation. Mean flow and turbulence properties were measured. The Reynolds number was 6 × 106 for the major part of the exper
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9

Devi, Kalpana, Prashanth Reddy Hanmaiahgari, Ram Balachandar, and Jaan H. Pu. "A Comparative Study between Sand- and Gravel-Bed Open Channel Flows in the Wake Region of a Bed-Mounted Horizontal Cylinder." Fluids 6, no. 7 (2021): 239. http://dx.doi.org/10.3390/fluids6070239.

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In nature, environmental and geophysical flows frequently encounter submerged cylindrical bodies on a rough bed. The flows around the cylindrical bodies on the rough bed are very complicated as the flow field in these cases will be a function of bed roughness apart from the diameter of the cylinder and the flow velocity. In addition, the sand-bed roughness has different effects on the flow compared to the gravel-bed roughness due to differences in the roughness heights. Therefore, the main objective of this article is to compare the mean velocities and turbulent flow properties in the wake reg
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10

Kashefipour, Seyed Mahmood, Mehdi Daryaee, and Mehdi Ghomeshi. "Effect of bed roughness on velocity profile and water entrainment in a sedimentary density current." Canadian Journal of Civil Engineering 45, no. 1 (2018): 9–17. http://dx.doi.org/10.1139/cjce-2016-0490.

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In this study, the effect of bed roughness on velocity profile and water entrainment in a sedimentary density current for Richardson numbers of 1.2–7 (subcritical flow conditions) was investigated. Experiments were carried out in a tilting flume with four different bed slopes, four roughness heights, and two fluid densities of sedimentary density currents. The results showed that bed roughness significantly affects the general shapes of velocity profiles, especially in the wall region. Two empirical equations were developed as the functions of the relative roughness for the wall and jet region
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Tesis sobre el tema "Bed roughness"

1

Robert, Andre. "Statistical modelling of sediment bed profiles and bed roughness properties in alluvial channels." Thesis, University of Cambridge, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.292244.

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Sorenson, Kent S. (Kent Soren). "Moveable bed roughness and sediment resuspension in the field." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/35047.

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Wilbers, Antoine. "The development and hydraulic roughness of subaqueous dunes /." Utrecht : Koninklijk Nederlands Aardrijkskundig Genootschap, 2004. http://www.loc.gov/catdir/toc/fy0708/2004464077.html.

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Lefebvre, Alice. "Bed roughness over vegetated beds : sonar imaging techniques and effect on unidirectional currents." Thesis, University of Southampton, 2009. https://eprints.soton.ac.uk/72139/.

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Small scale roughness of the seafloor is of direct relevance to a range of interests, including boundary layer hydrodynamics, sediment transport and high-frequency acoustic scattering. Despite its importance, only few studies have quantitatively resolved seafloor height at the relevant scales. In particular, characterisation of roughness over vegetated beds is needed to better understand hydrodynamics and sediment transport in the coastal zone. A new Benthic Roughness Acoustic Device (BRAD) has been developed to define microtopographical roughness through high-resolution imagery of the seabed.
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5

Rahman, Shikha. "Effect of bed roughness on scalar mixing in turbulent boundary layers." Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/32794.

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Batt, Rachel Louise. "The influence of bed roughness on the dynamics of gravity currents." Thesis, University of Leeds, 2008. http://etheses.whiterose.ac.uk/11282/.

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To date the influence of bed roughness onl the propagation and dynamics of gravity currents has been largely neglected. A new physical modelling dataset has been compiled, which details the fundamental affects of several bed roughnesses on lock-release gravity currents. Five bed configurations were chosen encompassing 'grain' and 'form' type elements at a range of spacings. 1%, 5% and 10% initial density excesses were studied and the effect of removing the buoyant ambient fluid between the elements examined. Observations due to changing the current depth relative to the element height were als
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7

Hersberger, Daniel S. "Wall roughness effects on flow and scouring in curved channels with gravel bed /." Lausanne, 2002. http://library.epfl.ch/theses/?display=detail&nr=2632.

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Thèse sciences techniques, EPF Lausanne, no 2632 (2002), Faculté Environnement naturel, architectural et construit ENAC, Domaine du génie civil. Directeur: A. Schleiss ; rapporteurs: M. Altinakar, G.-R. Bezzola, J. Gessler.
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8

Kendall, Robert L. "Sand bed roughness in the nearshore, COAST 3D experiment, Egmond aan Zee, the Netherlands." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2000. http://handle.dtic.mil/100.2/ADA380327.

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Thesis (M.S. in Meteorology and Physical Oceanography)--Naval Postgraduate School, June 1998.<br>Thesis advisor(s): Gallagher, Edith L. ; Thornton, Edward B. "June 2000." Includes bibliographical references (p. 75-76). Also available online.
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9

Velioglu, Deniz. "Effects Of Different Bed Roughnesses On The Characteristics Of Hydraulic Jumps." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614018/index.pdf.

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In practice, baffle blocks and sills are commonly being used to stabilize the location of a hydraulic jump and shorten the length of a stilling basin. On the other hand, gravels, corrugations and rectangular prismatic roughnesses which cover the entire length of the basin or placed in a staggered manner may be an alternative. The objective of this study is to determine the effects of these roughness elements on the characteristics of hydraulic jumps such as conjugate depth, jump length and energy dissipation using experimental data collected from the previous studies. The investigations show t
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10

Khan, Muhammad Ijaz. "The influence of two-dimensional bed roughness on the flow structure of a turbulent boundary layer." Thesis, University College London (University of London), 2004. http://discovery.ucl.ac.uk/1446901/.

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Experiments have been performed to investigate the relationship between the geometry of an idealised bed roughness and the structure of the turbulent boundary layer above. This work has particular applications in relation to architecture and environmental health, designing comfort for pedestrians and managing environmental pollution. Experiments were carried out in a laboratory water flume to study the turbulence structure generated under both rough and smooth bed conditions. The relationship between small scale turbulent eddies formed between the elements of a two-dimensional bed roughness an
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Libros sobre el tema "Bed roughness"

1

Wilbers, Antoine. The development and hydraulic roughness of subaqueous dunes. Royal Dutch Geographical Society/Utrecht University, 2004.

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2

Kendall, Robert L. Sand bed roughness in the nearshore, COAST 3D experiment, Egmond aan Zee, the Netherlands. Naval Postgraduate School, 2000.

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3

Jong, Carmen De. Temporal and spatial interactions between river bed roughness, geometry, bedload transport and flow hydraulics in mountain streams: Examples from Squaw Creek (Montana, USA) and Lainbach/Schmiedlaine (Upper Bavaria, Germany). Im Selbstverlag des Instituts für Geographische Wissenschaften der Freien Universität Berlin, 1995.

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4

Hey, Richard D., and C. R. Thorne. A Field Guide to Roughness Characteristics of Gravel-Bed Rivers: A Practical Approach. Wiley, 2001.

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Sand Bed Roughness in the Nearshore, COAST 3D Experiment, Egmond aan Zee, The Netherlands. Storming Media, 2000.

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6

McAdams, Stephen, and Bruno L. Giordano. The perception of musical timbre. Edited by Susan Hallam, Ian Cross, and Michael Thaut. Oxford University Press, 2012. http://dx.doi.org/10.1093/oxfordhb/9780199298457.013.0007.

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This article discusses musical-timbre perception. Musical timbre is a combination of continuous perceptual dimensions and discrete features to which listeners are differentially sensitive. The continuous dimensions often have quantifiable acoustic correlates. The timbre-space representation is a powerful psychological model that allows predictions to be made about timbre perception in situations beyond those used to derive the model in the first place. Timbre can play a role in larger-scale movements of tension and relaxation and thus contribute to the expression inherent in musical form. Unde
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7

Paeglīte, Ilze. Kustīgās slodzes dinamiskās iedarbes uz autoceļu tiltiem eksperimentāla izpēte un novērtējums. RTU Press, 2021. http://dx.doi.org/10.7250/9789934227028.

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Using data obtained from the dynamic load testing of bridges a method was developed to evaluate level of the dynamic performance without performing a dynamic load test. In this method a dynamic index of the bridge is calculated. Dynamic index allows to evaluate the dynamic performance level of existing and new structures taking into account such bridge parameters as span length / height ratio, natural frequency, vibration damping coefficient, relative deflection and international roughness index IRI. Dynamic index method can be used by bridge owners and maintainers to determine the dynamic pot
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8

Escudier, Marcel. Turbulent flow. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198719878.003.0018.

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In this chapter the principal characteristics of a turbulent flow are outlined and the way that Reynolds’ time-averaging procedure, applied to the Navier-Stokes equations, leads to a set of equations (RANS) similar to those governing laminar flow but including additional terms which arise from correlations between fluctuating velocity components and velocity-pressure correlations. The complex nature of turbulent motion has led to an empirical methodology based upon the RANS and turbulence-transport equations in which the correlations are modelled. An important aspect of turbulent flows is the
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Capítulos de libros sobre el tema "Bed roughness"

1

Kumar, Vijay. "Bed Roughness." In Encyclopedia of Earth Sciences Series. Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-90-481-2642-2_40.

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Lan, Xinyu, Jingmei Zhang, and Hang Wang. "Hydraulic Characteristics of Undular Hydraulic Jumps Over Different Bed Roughness." In Lecture Notes in Civil Engineering. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-4355-1_42.

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AbstractOccurrence of undular hydraulic jumps has impact on sediment transport and bank erosion in estuarine areas. The hydraulic properties vary when it forms on a rough bed, leading to modification of turbulent mixing processes. This paper reports on a study of undular hydraulic jumps generated with different types of bed roughness including smooth, rough rubber-matted and grated beds. The experiment was conducted with a flow rate of 241 m3/h using acoustic displacement meters (ADMs) and an acoustic Doppler velocimeter (ADV). The obtained results reveal a discernible descending order in the
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3

Armanini, Aronne. "Roughness in Fixed-Bed Streams." In Principles of River Hydraulics. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-68101-6_1.

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Rauen, W. B., B. Lin, and R. A. Falconer. "Modelling Dynamic Bed Roughness Associated with Bed Form Development." In Advances in Water Resources and Hydraulic Engineering. Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-89465-0_152.

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Chung, S. W., Q. Luo, and T. Stoesser. "Large-scale motion over spanwise heterogeneous bed roughness." In River Flow 2022. CRC Press, 2024. http://dx.doi.org/10.1201/9781003323037-12.

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Zanke, Ulrich. "Turbulence and suspension related to different bed roughness." In Transport of Suspended Solids in Open Channels. Routledge, 2022. http://dx.doi.org/10.1201/9780203735152-24.

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Nicholas, A. P. "Roughness Parameterization in CFD Modelling of Gravel-Bed Rivers." In Computational Fluid Dynamics. John Wiley & Sons, Ltd, 2005. http://dx.doi.org/10.1002/0470015195.ch13.

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Wang, Di, Yongqiang Yang, Yang Liu, Yuchao Bai, and Chaolin Tan. "Surface Characteristics and Roughness of Laser Powder Bed Fusion Processed Parts." In Laser Powder Bed Fusion of Additive Manufacturing Technology. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-5513-8_6.

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Mercurio, Vincenza, Flaviana Calignano, Giovanni Marchiandi, and Luca Iuliano. "Surface Roughness Measurement in Laser Powder Bed Fusion Manufacturing Process." In Flexible Automation and Intelligent Manufacturing: Establishing Bridges for More Sustainable Manufacturing Systems. Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-38241-3_48.

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Kim, Jisung, Won Kim, Chanjoo Lee, and Yong Jeon Kim. "Characteristic of Roughness Coefficient Associated with Discharge in Gravel-Bed River." In Advances in Water Resources and Hydraulic Engineering. Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-89465-0_169.

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Actas de conferencias sobre el tema "Bed roughness"

1

Kang, Ranbir Singh. "QUANTIFYING STREAM BED ROUGHNESS USING TERRESTRIAL LIDAR." In GSA Annual Meeting in Phoenix, Arizona, USA - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019am-334652.

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RATHORE, Vijit, Nadia PENNA, Subhasish DEY, and Roberto GAUDIO. "Computation of Bed Shear Stress from Velocity Measurements in a Gradually Varying Roughness Bed." In 38th IAHR World Congress. The International Association for Hydro-Environment Engineering and Research (IAHR), 2019. http://dx.doi.org/10.3850/38wc092019-0473.

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Kaczmarek, L. M., J. M. Harris, and B. A. O'Connor. "Modelling Moveable Bed Roughness and Friction for Spectral Waves." In 24th International Conference on Coastal Engineering. American Society of Civil Engineers, 1995. http://dx.doi.org/10.1061/9780784400890.024.

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Elgohary, T., R. Elgohary, and M. Hagrass. "Using sea bed roughness as a wave energy dissipater." In ISLANDS 2012. WIT Press, 2012. http://dx.doi.org/10.2495/islands120171.

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Adhikari, Manjish, and Jilu Li. "Ice surface and bed roughness estimation of petermann Glacier." In 2018 IEEE Radar Conference (RadarConf18). IEEE, 2018. http://dx.doi.org/10.1109/radar.2018.8378707.

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Luo, Qianyu, and Thorsten Stoesser. "Secondary currents and turbulence over spanwise heterogeneous bed roughness." In Proceedings of the 39th IAHR World Congress From Snow to Sea. International Association for Hydro-Environment Engineering and Research (IAHR), 2022. http://dx.doi.org/10.3850/iahr-39wc252171192022131.

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You, Zai-Jin, and Peter Nielsen. "Movable Bed Roughness in the Flow of Irregular Waves and Currents over Movable Beds." In 25th International Conference on Coastal Engineering. American Society of Civil Engineers, 1997. http://dx.doi.org/10.1061/9780784402429.270.

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Qiao, Changkai, Ruihua Nie, Xingnian Liu, Er Huang, and Shuyou Cao. "Study on the roughness coefficient of mountain gravel-bed rivers." In 2011 International Conference on Electric Technology and Civil Engineering (ICETCE). IEEE, 2011. http://dx.doi.org/10.1109/icetce.2011.5775995.

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Ghodke, Chaitanya D., and Sourabh V. Apte. "A Numerical Investigation to Study Roughness Effects in Oscillatory Flows." In ASME 2017 Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/fedsm2017-69066.

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Effects of roughness on the near-bed turbulence characteristics in oscillatory flows are studied by means of particle-resolved direct numerical simulations (DNS). Two particle sizes of diameter 375 and 125 in wall units corresponding to the large size gravel and the small size sand particle, respectively, in a very rough turbulent flow regime are reported. A double-averaging technique is employed to study the nature of the wake field, i.e., the spatial inhomogeneities at the roughness length scale. This introduced additional production and transport terms in double-averaged Reynolds stress bud
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Nyantekyi-Kwakye, B., E. E. Essel, S. Clark, and M. F. Tachie. "Experimental Study of Shallow Open Channel Turbulent Flows Over Rough Walls." In ASME 2014 4th Joint US-European Fluids Engineering Division Summer Meeting collocated with the ASME 2014 12th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/fedsm2014-21559.

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An experimental study was undertaken to investigate the effects of bed roughness on the turbulence characteristics of shallow open channel flows. The measurements were performed in a recirculating open channel flow over a reference smooth bed and a three-dimensional rough bed (36-grit sandpaper). The velocity measurements were conducted using a high resolution particle image velocimetry (PIV) system. The Reynolds number based on the depth of flow (h) and freestream velocity (Ue) varied from 21000 to 30000 and the Froude number ranged from 0.46 to 0.65. Two smooth bed experiments were conducted
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Informes sobre el tema "Bed roughness"

1

Ivakin, Anatoliy N., and Darrell R. Jackson. Multiple Scattering and Volume-Roughness Interactions in Sea Bed Acoustics. Defense Technical Information Center, 1998. http://dx.doi.org/10.21236/ada537382.

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Ivakin, Anatoliy N., and Darrell R. Jackson. Multiple Scattering and Volume-Roughness Interactions in Sea Bed Acoustics. Defense Technical Information Center, 1999. http://dx.doi.org/10.21236/ada629694.

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Styles, Richard, Scott Glenn, and Mitchell Brown. An optimized combined wave and current bottom boundary layer model for arbitrary bed roughness. Coastal and Hydraulics Laboratory (U.S.), 2017. http://dx.doi.org/10.21079/11681/22734.

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Docherty, Nicholas J., and Hubert Chanson. Characterisation of unsteady turbulence in breaking tidal bores including the effects of bed roughness. The University of Queensland, School of Civil Engineering, 2010. http://dx.doi.org/10.14264/205576.

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Slattery, Kevin. Unsettled Topics on Surface Finishing of Metallic Powder Bed Fusion Parts in the Mobility Industry. SAE International, 2021. http://dx.doi.org/10.4271/epr2021001.

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Laser and electron-beam powder bed fusion (PBF) additive manufacturing (AM) technology has transitioned from prototypes and tooling to production components in demanding fields such as medicine and aerospace. Some of these components have geometries that can only be made using AM. Initial applications either take advantage of the relatively high surface roughness of metal PBF parts, or they are in fatigue, corrosion, or flow environments where surface roughness does not impose performance penalties. To move to the next levels of performance, the surfaces of laser and electron-beam PBF componen
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Ziegler, Nancy, Nicholas Webb, Adrian Chappell, and Sandra LeGrand. Scale invariance of albedo-based wind friction velocity. Engineer Research and Development Center (U.S.), 2021. http://dx.doi.org/10.21079/11681/40499.

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Obtaining reliable estimates of aerodynamic roughness is necessary to interpret and accurately predict aeolian sediment transport dynamics. However, inherent uncertainties in field measurements and models of surface aerodynamic properties continue to undermine aeolian research, monitoring, and dust modeling. A new relation between aerodynamic shelter and land surface shadow has been established at the wind tunnel scale, enabling the potential for estimates of wind erosion and dust emission to be obtained across scales from albedo data. Here, we compare estimates of wind friction velocity (u*)
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7

Stache, Jeremiah. A dynamic aircraft response model for determining roughness limits. Engineer Research and Development Center (U.S.), 2024. http://dx.doi.org/10.21079/11681/48513.

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Runway roughness poses significant risks to aircraft and aircraft personnel. Roughness irregularities can be found in both civilian and military airfields, from rutting to bomb-damaged repairs. Various methods exist for determining roughness criteria, such as discrete surface deviation evaluation and dynamic response models. Although validated dynamic response models such as TAXI-G were used extensively in the HAVE BOUNCE program from the 1970s up to the late 1990s, modern military aircraft have not undergone the same formal analysis. This paper presents the mathematical formulation and valida
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8

Grimley, Terry. PR-015-20606-R01 Practical Effects of Rough-Walled pipe in Gas Metering Applications. Pipeline Research Council International, Inc. (PRCI), 2021. http://dx.doi.org/10.55274/r0012016.

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The influence of upstream pipe roughness on the performance of multipath ultrasonic flow meters was examined through a set of experiments involving three different brands of ultrasonic flow meters. Tests were conducted with 16-inch meters with piping, having a wide variation in surface roughness values with and without a flow conditioner. These results, when combined with the earlier testing of 8-inch diameter meters, can be used to support changes in the practices currently recommended by industry standards.
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9

Grimley, Terry. PR-015-19603-R01 Practical Effects of Rough-Walled Pipe in Gas Metering Applications. Pipeline Research Council International, Inc. (PRCI), 2020. http://dx.doi.org/10.55274/r0011742.

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The influence of upstream pipe roughness on the performance of multipath ultrasonic flow meters was examined through a cursory literature review and an examination of experimental test data supplied by the natural gas industry. The results of these efforts were used to develop a recommendation for additional testing whereby the results of that testing can be combined with these results and potentially be used to support changes in the practices recommended by current industry standards.
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10

Ziegler, Nancy, Nicholas Webb, John Gillies, et al. Plant phenology drives seasonal changes in shear stress partitioning in a semi-arid rangeland. Engineer Research and Development Center (U.S.), 2023. http://dx.doi.org/10.21079/11681/47680.

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Accurate representation of surface roughness in predictive models of aeolian sediment transport and dust emission is required for model accuracy. While past studies have examined roughness effects on drag partitioning, the spatial and temporal variability of surface shear velocity and the shear stress ratio remain poorly described. Here, we use a four-month dataset of total shear velocity (u*) and soil surface shear velocity (us*) measurements to examine the spatiotemporal variability of the shear stress ratio (R) before, during, and after vegetation green-up at a honey mesquite (Prosopis glan
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