Field studies of sediment transport by overland flow

1980 ◽  
Vol 5 (4) ◽  
pp. 307-316 ◽  
Author(s):  
R. P. C. Morgan
Keyword(s):  
Sediment Transport ◽  
Overland Flow ◽  
Field Studies

scholarly journals Aeolian sediment transport over gobi: Field studies atop the Mogao Grottoes, China

2016 ◽  
Vol 21 ◽  
pp. 53-60 ◽  
Author(s):  
Lihai Tan ◽  
Weimin Zhang ◽  
Jianjun Qu ◽  
Junzhan Wang ◽  
Zhishan An ◽  
...  
Keyword(s):  
Sediment Transport ◽  
Field Studies ◽  
Mogao Grottoes ◽  
Aeolian Sediment

Experimental study of sediment transport processes and size selectivity of eroded sediment on steep Pisha sandstone slopes

2020 ◽  
Author(s):  
Pan Zhang ◽  
Pingqing Xiao ◽  
Chunxia Yang
Keyword(s):  
Sediment Transport ◽  
Flow Velocity ◽  
Overland Flow ◽  
Yellow River ◽  
Transport Processes ◽  
The Yellow River ◽  
Size Selectivity ◽  
Coarse Sediment ◽  
Sediment Particles ◽  
Slope Flow

<p>The Pisha sandstone area on the Ordos Plateau of China is the primary source of coarse sediment of the Yellow River. Sediment size distribution and selectivity greatly affect sediment transport and deposition. Hence, sediment transport processes and size selectivity by overland flow on Pisha sandstone slopes were investigated in this study. Experiments were run with Pisha sandstone soil (bulk density of 1.35 g/cm<sup>3</sup>) under rainfall intensities of 87 and 133 mm/h with a 25° slope gradient, and the duration of simulated rainfall is 1 h. Sediment and runoff were sampled at 2-min intervals to examine the size distribution change of the eroded sediment. The particle composition, enrichment rate, fractal dimension, and time distribution characteristics of median grain size (d<sub>50</sub>) of eroded sediment were comprehensively analyzed. Statistical analyses showed that the erosion process of Pisha sandstone slope mainly transported coarse sediment. More than 40% of eroded sediment particles were coarse sediment, which will become the main sediment in the lower reaches of the Yellow River bed. The particle size of eroded sediment tended to gradually decrease with the continuous rainfall but remained larger than the background value of Pisha sandstone soil after refinement. The fractal dimension was positively correlated with the slope flow velocity, while the d<sub>50</sub> was negatively correlated with the slope flow velocity. Overall, these findings show a strong relationship between the sediment transport and flow velocity, which indicates that the selectivity and transportation of sediment particles on the Pisha sand slopes is mainly influenced by the hydrodynamic parameters of overland flow. This study provides a methodology and data references for studying the particle selectivity characteristics of eroded sediment and provides a scientific basis for revealing the mechanism of erosion and sediment yield in the Pisha sandstone area of China.</p>

Sediment Transport Capacity of Overland Flow

1985 ◽  
Vol 28 (3) ◽  
pp. 755-762 ◽  
Author(s):  
P. Y. Julien ◽  
D. B. Simons
Keyword(s):  
Sediment Transport ◽  
Overland Flow ◽  
Transport Capacity ◽  
Sediment Transport Capacity

Flow resistance and sediment transport by concentrated overland flow in a grassland valley

Geomorphology ◽  
1995 ◽  
Vol 13 (1-4) ◽  
pp. 71-86 ◽  
Author(s):  
Ian P. Prosser ◽  
William E. Dietrich ◽  
Janelle Stevenson
Keyword(s):  
Sediment Transport ◽  
Flow Resistance ◽  
Overland Flow

Shear stress partitioning and sediment transport by overland flow

2000 ◽  
Vol 38 (1) ◽  
pp. 37-40 ◽  
Author(s):  
Joseph F. Atkinson ◽  
Athol D. Abrahams ◽  
Chitra Krishnan ◽  
Gang Li
Keyword(s):  
Shear Stress ◽  
Sediment Transport ◽  
Overland Flow ◽  
Stress Partitioning ◽  
Shear Stress Partitioning

scholarly journals Numerical Investigation of a Flash Flood Process that Occurred in Zhongdu River, Sichuan, China

2021 ◽  
Vol 9 ◽  
Author(s):  
Qingyuan Yang ◽  
Tonghuan Liu ◽  
Jingjing Zhai ◽  
Xiekang Wang
Keyword(s):  
Sediment Transport ◽  
Water Level ◽  
Flash Flood ◽  
Peak Level ◽  
Field Studies ◽  
Bed Deformation ◽  
Bed Erosion ◽  
Set Up ◽  
Discharge Profile ◽  
The Impact

In 2018, a flash flood occurred in the Zhongdu river, which lies in Yibin, Sichuan province of China. The flood caused many casualties and significant damage to people living nearby. Due to the difficulty in predicting where and when flash floods will happen, it is nearly impossible to set up monitors in advance to detect the floods in detail. Field investigations are usually carried out to study the flood propagation and disaster-causing mechanism after the flood’s happening. The field studies take the relic left by the flash flood to deduce the peak level, peak discharge, bed erosion, etc. and further revel the mechanism between water and sediment transport during the flash flood This kind of relic-based study will generate bigger errors in regions with great bed deformation. In this study, we come up with numerical simulations to investigate the flash flood that happened in the Zhongdu river. The simulations are based on two-dimensional shallow water models coupled with sediment transport and bed deformation models. Based on the real water level and discharge profile measured by a hydrometric station nearby, the numerical simulation reproduced the flash flood in the valley. The results show the flood coverage, water level variation, and velocity distribution during the flood. The simulation offers great help in studying the damage-causing process. Furthermore, simulations without considering sediment transport are also carried out to study the impact of bed erosion and sedimentation. The study proved that, without considering bed deformation, the flood may be greatly underestimated, and the sediment lying in the valley has great impact on flood power.

Topographic dependence of aggregate stability, overland flow and sediment transport

Agronomie ◽  
2002 ◽  
Vol 22 (5) ◽  
pp. 489-501 ◽  
Author(s):  
Yves Le Bissonnais ◽  
Sylvie Cros-Cayot ◽  
Chantal Gascuel-Odoux
Keyword(s):  
Sediment Transport ◽  
Overland Flow ◽  
Aggregate Stability ◽  
Flow And Sediment Transport

scholarly journals Morphological development of river widenings with variable sediment supply

2018 ◽  
Vol 40 ◽  
pp. 02007 ◽  
Author(s):  
Cristina Rachelly ◽  
Volker Weitbrecht ◽  
David F. Vetsch ◽  
Robert M. Boes
Keyword(s):  
Sediment Transport ◽  
Adverse Effects ◽  
Habitat Heterogeneity ◽  
Field Studies ◽  
Sediment Supply ◽  
Morphological Development ◽  
Regime Theory ◽  
Channel Response ◽  
River Bed ◽  
Experimental Flume

River widening is a common restoration approach to mitigate the adverse effects of past stream alterations on infrastructure and the riparian ecosystem by stabilizing the river bed and enhancing habitat heterogeneity. In this study, two river widening approaches, excavated and dynamic, are described for the case of moderately steep gravel-bed rivers in the Alpine foothills, with a focus on dynamic river widening. As most channelized rivers exhibit ongoing degradation due to the lack of sediment supply and efforts to restore sediment transport are increasing, the consideration of the response of river widenings to variable sediment supply is important. For this purpose, insights from regime theory are applied to river widening and several experimental flume and field studies on channel response to variable sediment supply are reviewed. Dynamic river widenings are expected to be morphologically active in weakly degraded rivers with sufficient sediment supply, while they may not be an appropriate restoration approach for highly degraded rivers due to persistent impairment of morphological activity.

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