Results 1 to 10 of about 79,589 (237)

Real-time correction of channel-bed roughness and water level in river network hydrodynamic modeling for accurate forecasting [PDF]

Scientific Reports, 2023
The accuracy and reliability of hydrodynamic models are sensitive to both hydraulic state variables and model parameters, particularly the bed roughness, while their simultaneous real-time corrections and corresponding effects still need to be well ...
Yifan Chen, Feifeng Cao, Weiping Cheng, Bin Liu, Pubing Yu   +4 more
doaj   +2 more sources

Effect Of Flow Resistance In Open Rectangular Channel [PDF]

MATEC Web of Conferences, 2017
The determination of flow resistance for open channels remains a challenge in practices. In this research, an experimental study was carried out to investigate the hydraulic roughness characteristics in an open channel.
Ahmad Noor Aliza, Saiful Bahry Saiful Iswal, Md Ali Zarina, Mat Daud Azra Munirah, Musa Sabariah   +4 more
doaj   +4 more sources

Numerical simulation of flow over a rough bed [PDF]

Journal of Hydraulic Engineering, 2004
This paper presents results of a direct numerical simulation (DNS) of turbulent flow over the rough bed of an open channel. We consider a hexagonal arrangement of spheres on the channel bed.
G. Salton, G.H. Silber, J.P. Callan, M.A.K. Halliday, M.F. Porter   +4 more
core   +11 more sources

Impact of bed roughness configurations on flow dynamics and hydraulic resistance in open-channel flows [PDF]

Scientific Reports
Bed roughness significantly influences open-channel flow dynamics, affecting velocity profiles, energy distribution, and hydraulic resistance in natural and engineered rivers.
Hossein Sohrabzadeh Anzani, Sameh Ahmed Kantoush, Sohei Kobayashi   +2 more
doaj   +2 more sources

Using bed-roughness signatures to characterise glacial landform assemblages beneath palaeo-ice sheets

Journal of Glaciology, 2022
Palaeo-glacial landforms can give insights into bed roughness that currently cannot be captured underneath contemporary-ice streams. A few studies have measured bed roughness of palaeo-ice streams but the bed roughness of specific landform assemblages ...
Francesca A. M. Falcini, Maarten Krabbendam, Katherine A. Selby, David M. Rippin   +3 more
doaj   +1 more source

A self-adaptive two-parameter method for characterizing roughness of multi-scale subglacial topography

Journal of Glaciology, 2021
During 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 ...
Shinan Lang, Ben Xu, Xiangbin Cui, Kun Luo, Jingxue Guo, Xueyuan Tang, Yiheng Cai, Bo Sun, Martin J. Siegert   +8 more
doaj   +1 more source

Variation characteristics and formula of movable bed roughness for the Lower Yellow River

Shui kexue jinzhan, 2021
The calculation of movable bed roughness plays an important role in modelling of flood routing and bed deformation in alluvial rivers. Bedforms in the Lower Yellow River (LYR) vary greatly under different flow and sediment regimes, which cause ...
Junqiang XIA, Xin LIU, Xiaolei ZHANG, Meirong ZHOU   +3 more
doaj   +1 more source

Evaluation drag coefficients for circular patch vegetation with different riverbed roughness

Cogent Engineering, 2022
The drag coefficient of a one-line circular patch of emergent sparse vegetation in an open-channel flow or riverbeds with varying bed roughness sizes was experimentally investigated.
Karim R. Gubashi, Saad Mulahasan, Mohammed Abid Jameel, Abdul-Sahib T. Al-Madhhachi   +3 more
doaj   +1 more source

A Comparative Study between Sand- and Gravel-Bed Open Channel Flows in the Wake Region of a Bed-Mounted Horizontal Cylinder

Fluids, 2021
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 ...
Kalpana Devi, Prashanth Reddy Hanmaiahgari, Ram Balachandar, Jaan H. Pu   +3 more
doaj   +1 more source

Experimental Determination of Pressure Fluctuations in Stilling Basin with Sudden Expanding and Roughened Bed [PDF]

محیط زیست و مهندسی آب, 2022
The effect of fluctuating pressures due to turbulence on the hydraulic jump causes significant damage to the relaxation pool. Moreover, the presence of roughness in the bed changes the behavior of flow lines and the formation of vortices during the jump.
Marzieh Naemhasani, Kouros Nekoufar, Morteza Biglarian, Morteza Jamshidi   +3 more
doaj   +1 more source