scholarly journals GEOMETRIC CHARACTERISTICS OF WAVE-GENERATED SAND RIPPLES: A FULL-SCALE EXPERIMENTAL STUDY

2018 ◽  
pp. 48
Author(s):  
Dongxu Wang ◽  
Jing Yuan ◽  
Ole S. Madsen
Keyword(s):  
Experimental Study ◽  
Sediment Transport ◽  
Coastal Environment ◽  
Transport Processes ◽  
Flow Conditions ◽  
Sand Ripples ◽  
Geometric Characteristics ◽  
The Past ◽  
Coherent Vortex ◽  
Wave Induced

In the coastal environment, wave-induced sand ripples are usually observed under moderate near-bed flow conditions. Their occurrence significantly changes the local hydrodynamics and sediment transport processes. Over the past few decades, some solid progresses have been made towards understating the ripple dimensions under wave-generated near-bed flows, e.g., O'Donoghue et al. [2006], but very few studies are targeted on the more detailed geometric characteristics, e.g., the generic shape of ripples and the sharpness of ripple crests, which are closely related to the coherent vortex structures. This study is aimed at filling this knowledge gap.

An Experimental Study on the Wave-Induced Topographic Change in Artificial Shallows: Focusing on the Effects of Pore-Water Pressure on Sediment Transport

2014 ◽  
Vol 56 (2) ◽  
pp. 1450008-1-1450008-21 ◽  
Author(s):  
Tomoaki Nakamura ◽  
Yuta Nezasa ◽  
Yong-Hwan Cho ◽  
Ryo Ishihara ◽  
Norimi Mizutani
Keyword(s):  
Experimental Study ◽  
Sediment Transport ◽  
Pore Water ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Wave Induced

NUMERICAL INVESTIGATION OF THE IRREGULAR WAVE-INDUCED SEDIMENT TRANSPORT PROCESSES

2019 ◽  
Author(s):  
ZHUBIN CAO ◽  
CHI ZHANG ◽  
HONGSHUAI QI ◽  
YAO ZHANG ◽  
JINHAI ZHENG ◽  
...  
Keyword(s):  
Sediment Transport ◽  
Numerical Investigation ◽  
Transport Processes ◽  
Irregular Wave ◽  
Wave Induced

A two-phase approach to wave-induced sediment transport under sheet flow conditions

2011 ◽  
Vol 58 (11) ◽  
pp. 1072-1088 ◽  
Author(s):  
Xin Chen ◽  
Yong Li ◽  
Xiaojing Niu ◽  
Daoyi Chen ◽  
Xiping Yu
Keyword(s):  
Sediment Transport ◽  
Flow Conditions ◽  
Sheet Flow ◽  
Two Phase ◽  
Phase Approach ◽  
Wave Induced

scholarly journals CFD-DEM modelling of sediment transport in sewer systems under steady and unsteady flow conditions

2019 ◽  
Vol 80 (11) ◽  
pp. 2141-2147 ◽  
Author(s):  
Maryam Alihosseini ◽  
Sveinung Sægrov ◽  
Paul Uwe Thamsen
Keyword(s):  
Sediment Transport ◽  
Laboratory Experiments ◽  
Transport Processes ◽  
Experimental Investigations ◽  
Flow Conditions ◽  
Ansys Fluent ◽  
Sewer Pipes ◽  
Rough Bed ◽  
New Methodologies ◽  
Sand And Gravel

Abstract Numerical and experimental investigations were undertaken to study sediment transport under steady flow conditions and under flush waves in sewer pipes. Experiments were carried out with sand and gravel of different size distributions under smooth and rough bed conditions. Moreover, different hydraulic boundary conditions were investigated for flush waves. The numerical part of this study was carried out in the computational fluid dynamics (CFD) software ANSYS Fluent, which is two-way coupled to the Discrete Element Method (DEM) software EDEM. The main focus of this study is to determine if the CFD-DEM coupled method could reasonably predict the behaviour of sediments in sewers and thus be used for studying various features of sediment transport that are not easy to determine in laboratory experiments or in-situ measurements. Furthermore, it is important to replace the traditional empirical approaches developed for fluvial conditions with new methodologies, which are able to consider the high number of variables involved in sediment transport in sewers. The numerical model was validated with laboratory experiments and used to study details of sediment transport processes in sewers.

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

Geomorphology ◽  
2020 ◽  
Vol 363 ◽  
pp. 107211
Author(s):  
Pan Zhang ◽  
Wenyi Yao ◽  
Guobin Liu ◽  
Peiqing Xiao ◽  
Weiying Sun
Keyword(s):  
Experimental Study ◽  
Sediment Transport ◽  
Transport Processes ◽  
Size Selectivity

scholarly journals Effects on Scour for Different Foundation Geometry of Compound Circular Bridge Piers

2019 ◽  
Vol 8 (2) ◽  
pp. 2439-2446
Keyword(s):  
Experimental Study ◽  
Rate Of Change ◽  
Bridge Pier ◽  
Bridge Piers ◽  
Scour Depth ◽  
Flowing Water ◽  
Sound Design ◽  
Flow Conditions ◽  
The Past ◽  
Bridge Failure

This experimental study examines the variation of scour depth with time of Clearwater scour condition around compound circular bridge piers for steady flow conditions. Most of the circular bridge piers are resting on the bigger diameter caissons known as the compound circular bridge piers and are widely used in India for construction of road and railways bridge across the rivers. In past studies, it has been observed that most bridge failure occurs because of scouring due to flowing water around a bridge pier across a river. Most of the past studies were done on the uniform bridge pier and a very few studies have been done so far on scouring around non-uniform bridge piers. Estimation of scour depth is required for the economical and a sound design of bridge pier foundation. In present study, an experimental investigation has been done in a tilting flume for computation of rate of change of depth of scour with time at two different models of compound circular bridge piers by varying the foundation top position with respect to level of bed, i.e., 1. The foundation top at the level of bed, and 2. The foundation top below the level of bed (viz. 10mm, 20mm, 30mm and 40mm) for uniform sediments.

Sign in / Sign up

Export Citation Format

Share Document