A method for simulating sediment incipient motion varying with time and space in an ocean model (FVCOM): development and validation

2018 ◽  
Vol 36 (4) ◽  
pp. 1216-1235
Author(s):  
Zichen Zhu ◽  
Yongzhi Wang ◽  
Shuhua Bian ◽  
Zejian Hu ◽  
Jianqiang Liu ◽  
...  
Keyword(s):  
Ocean Model ◽  
Incipient Motion ◽  
Time And Space ◽  
Development And Validation ◽  
Sediment Incipient Motion

Experiment on Incipient Motion of Clayey Silt in the Main Channel of Xuwei Harbor, Lianyungang under Wave-Current Action

2014 ◽  
Vol 638-640 ◽  
pp. 1247-1251
Author(s):  
Yan Li ◽  
Hui Xiao
Keyword(s):  
Shear Stress ◽  
Main Channel ◽  
Bed Sediment ◽  
Incipient Motion ◽  
Current Action ◽  
Clayey Silt ◽  
Current Interaction ◽  
Depth Water ◽  
Sediment Incipient Motion

For two sampling sediment take from the-3m and-5m depth water in the main channel of Xuwei port, Lianyungang, the experiment of sediment incipient motion under wave-current interaction is carried out in a wave-current flume. The results show that the wet density of bed sediment is 1.4 t/m3 and 1.5 t/m3 respectively, the critical incipient shear stress at the bottom of the bed is between 0.21 N/m2~ 0.29 N/m2 and 0.35 N/m2 ~ 0.46 N/m2 respectively; the critical incipient shear stress of sediment from-3m depth water is greater than from the-5m depth water for the same wet density of bed sediment. The results can provide parameters and basis to the research of engineering sediment problem.

Effect of Accelerating on Sediment Incipient Motion over Dunes under Shallow Water Condition

2014 ◽  
Vol 1065-1069 ◽  
pp. 561-568
Author(s):  
Dian Guang Ma ◽  
Wei Liang Dong ◽  
Jun Feng Xu
Keyword(s):  
Velocity Profile ◽  
Shallow Water ◽  
Cross Sections ◽  
Flow Region ◽  
Incipient Motion ◽  
Flow Acceleration ◽  
Water Condition ◽  
Profile Characteristics ◽  
Crest Length ◽  
Sediment Incipient Motion

Due to the complexity of bed form morphology and dune movement, this paper selected a series of 2-D asymmetric dunes in order to address the development of a flow region associated with velocity profile characteristics and sediment incipient motion under shallow water condition. Experiments were conducted over four asymmetric dunes of one crest length (4 m), two crest height (0.3m,0.4m) and two uniform sediments with mean grain sizes D=0.5 and 0.7 mm at the TianJin Research Institute For Water Transport Engineering, China. By using Acoustic Doppler Velocimeter (ADV), the instantaneous velocities were measured at four cross sections giving a total of 16 measured profiles. The variations of velocity profile along the flow affected by the wavy bottom have been studied. The results show that the effect of flow acceleration plays an important role in governing incipient motion over dunes.

Study on the Characteristics of Sediment Incipient Motion in Pressure Pipeline

2014 ◽  
Vol 1010-1012 ◽  
pp. 1028-1032
Author(s):  
Ming Hui Lei ◽  
Rui Hua Nie ◽  
Su Qin Yuan ◽  
Xing Nian Liu
Keyword(s):  
Experimental Data ◽  
Velocity Distribution ◽  
Critical Velocity ◽  
Incipient Motion ◽  
Generalized Model ◽  
Model Experiments ◽  
Pressure Pipeline ◽  
Recorded Data ◽  
Sediment Incipient Motion

The generalized model experiments were designed and conducted in the pressure pipeline to investigate the characteristic of sediment incipient motion. There were some differences between the measured sediment critical velocity and the predictive one which was calculated by traditional formulas. In this paper, the analyses of velocity distribution and its corresponding effect on the sediment incipient motion in the pressure pipeline are done. Then, a simple but available formula which is suitable for the prediction of sediment critical velocity in the pressure pipeline is proposed. Finally, this formula is verified by experimental data and good agreements are observed between the recorded data and predictions.

scholarly journals Applications of ultrasound imaging system for measuring water-sand parameters during sediment transport process in hydraulic model experiments

2017 ◽  
Vol 20 (2) ◽  
pp. 410-423 ◽  
Author(s):  
Xianjian Zou ◽  
Chuanying Wang ◽  
Huan Song ◽  
Zengqiang Han ◽  
Zhimin Ma ◽  
...  
Keyword(s):  
Sediment Transport ◽  
Flow Velocity ◽  
Ultrasound Imaging ◽  
Transport Process ◽  
Imaging System ◽  
Hydraulic Model ◽  
Space Distribution ◽  
Incipient Motion ◽  
Model Experiments ◽  
Sediment Incipient Motion

Abstract Moving particles and the topographic bed under muddy water or in sediment-laden flow are often clouded by suspended sediments, making it hard to detect or analyze for visualization. This paper concerns applications of ultrasound imaging measurement method for the visual measurement of related water-sand parameters during sediment transport process in hydraulic model experiments. We use a B-mode ultrasound imaging system to measure the related parameters of suspended sediment concentration (SSC), underwater topographic riverbed, flow velocity and sediment incipient motion, conducted at a water channel. A comprehensive measuring system for the visualization of multiple water-sand parameters is established. Results show that the measurement and analysis of SSC and its space distribution, topography bedform, flow velocity and flow field, and sediment incipient velocity can be realized. Ultrasound imaging measurements of SSC and their space distribution can be shown in real time, and also dynamic monitoring and analysis of sediment incipient motion and topography bedform during the sediment transport process. This method realizes the experimental visualization of the topographic bed and sediment-laden flow. Application of an ultrasound imaging measurement system has promoted the development of sediment movement law research and related hydraulic model experiment measurement technique.

Experimental Study on Critical Stress for Sediment Incipient Motionin Deep Channel of North Passage of Yangtze River Estuary

2015 ◽  
Vol 751 ◽  
pp. 170-175
Author(s):  
Qi Xiu Pang ◽  
Chun Peng Wen ◽  
Rui Bo Zhang
Keyword(s):  
Critical Stress ◽  
Yangtze River ◽  
River Estuary ◽  
Critical Parameters ◽  
Yangtze River Estuary ◽  
Shear Stresses ◽  
Particle Sizes ◽  
Incipient Motion ◽  
Deep Channel ◽  
Sediment Incipient Motion

The average particle sizes of the sediment deposited in deep channel of North Passage of Yangtze River estuary are different at different channel segments in the flooding and dry seasons. As a response, the critical stress for sediment incipient motion might be different, which needs to be studied systematically especially after the channel reaches a new grade with depth of 12.5m. Therefore, a series of tests on the sediment were conducted to determine the critical parameters for the sediment incipient motion with different particle sizes between 0.01mm and 0.04mmcollected from deep channel of Yangtze River. The experimental data indicate that the critical shear stresses increase exponentially with density, and the stresses are 0.2-0.7Pa for the mud with density of 1200-1600kg/m3.And the relational expression between the critical shear stress and the depth was built, which might be applied in the mathematical model to simulate the process of incipient motion for sediment in deep channel of Yangtze River and others.

scholarly journals The Role of 2D Seepage on Sediment Incipient Motion around a Pipeline

2021 ◽  
Vol 9 (6) ◽  
pp. 580
Author(s):  
Hualing Zhai ◽  
Dong-Sheng Jeng ◽  
Zhen Guo
Keyword(s):  
Seepage Flow ◽  
Incipient Motion ◽  
Key Factors ◽  
Large Wave ◽  
Gap Ratio ◽  
Offshore Pipeline ◽  
Pipeline Project ◽  
Offshore Industry ◽  
Wave Induced ◽  
Sediment Incipient Motion

Pipelines have been used as one of the main transportation methods for the offshore industry, with increasing activities in marine resources recently. Prediction of seabed instability is one of key factors that must be taken into consideration for an offshore pipeline project. As the first step of the scour process, sediment incipient motion has been intensively studied in the past. Most previous investigations didn’t consider the wave-induced seepage in the elevation of sediment motion. In this paper, two-dimensional seepage was considered to modify the conventional Shields number and its associated impact on sediment incipient motion around the trenched pipeline was investigated. Both flat and sloping seabeds are considered. The numerical results indicated that a peak or valley of the modified Shields number was formed below the pipeline and horizontal seepage flow tremendously impact the sediment motion in the vicinity of the pipeline. Parametric analysis concludes: the influence of the seepage around the pipeline becomes more significant in a large wave, shallow water in a seabed with large shear modulus and permeability, and larger pipeline diameter and smaller flow gap ratio. This will make soil particles be more easily dragged away from the seabed.

Impact of two-dimensional seepage flow on sediment incipient motion under waves

2021 ◽  
Vol 108 ◽  
pp. 102510
Author(s):  
Hualing Zhai ◽  
Dong-Sheng Jeng ◽  
Zhen Guo ◽  
Zuodong Liang
Keyword(s):  
Seepage Flow ◽  
Two Dimensional ◽  
Incipient Motion ◽  
Sediment Incipient Motion

scholarly journals Comparison Between Numerical Flow3d Software and Laboratory Data, For Sediment Incipient Motion.

2022 ◽  
Vol 961 (1) ◽  
pp. 012031
Author(s):  
Rasool Kosaj ◽  
Rafid S Alboresha ◽  
Sadeq O Sulaiman
Keyword(s):  
Laboratory Data ◽  
Small Diameter ◽  
Incipient Motion ◽  
Rigid Boundary ◽  
Laboratory Results ◽  
Computational Fluid Dynamics Cfd ◽  
Bed Slope ◽  
Different Diameters ◽  
3D Software ◽  
Sediment Incipient Motion

Abstract In this paper, the laboratory data were compared with computational fluid dynamics (CFD) Flow3D for predicting the beginning of sediment incipient motion in rigid boundary channel for two types of sands, irrigation, and sewer types, in rectangular flume (0.5*0.5)m cross-section. Tests were made for soil samples with different diameters, specific weights. The testing was performed in slopes ranging from 0.001-0.003 for irrigation types and 0.0025-0.025 for sewer types depending on the original parameter. The Flow-3D software has simulated the laboratory work using scouring models MPM and Nielsen. the relation between sediment incipient motion velocity, particle size, and channel bed slope was predicted. The results were relatively more than laboratory data for the MPM model, while grating convergence for Nielsen model, especially for small diameter sediment. Also, the laboratory results are more close to the results of Flow3D using the Nielsen model when the value of bed slope of the channel is greater, and vice versa when the slope decreases.

scholarly journals Effect of seepage flow on sediment incipient motion around a free spanning pipeline

2019 ◽  
Vol 143 ◽  
pp. 50-62 ◽  
Author(s):  
Zhen Guo ◽  
Dong-Sheng Jeng ◽  
Hongyi Zhao ◽  
Wei Guo ◽  
Lizhong Wang
Keyword(s):  
Seepage Flow ◽  
Incipient Motion ◽  
Sediment Incipient Motion
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