Estimating coefficients in one-dimensional depth-averaged sediment transport model

2001 ◽  
Vol 28 (3) ◽  
pp. 536-540 ◽  
Author(s):  
Qing-Chao Guo ◽  
Yee-Chung Jin
Keyword(s):  
Sediment Transport ◽  
Carrying Capacity ◽  
Transport Model ◽  
Sediment Concentration ◽  
Model Verification ◽  
Practical Applications ◽  
Reference Concentration ◽  
Acceptable Method ◽  
Averaged Model ◽  
Sediment Carrying Capacity

Various coefficients in sediment transport models must be accounted for. Models based on depth-averaged equations and sediment carrying capacity formula contain some coefficients: α, k, and m. At the present, no widely acceptable method has been developed for determining the values of these coefficients. The focus of this paper is in the development of semi-theoretical formulas for estimating these coefficients such that, in practical applications, the uncertainty involved in selecting coefficients is minimized. Model verification shows that the coefficients obtained from the proposed formulas give a good simulation of the channel bed deformation. In addition, Rouse's equation for sediment concentration distribution will become solvable because the reference concentration can be determined from the derived expression for α. The simulated concentration profiles obtained by solving the Rouse's equation and α formula agree reasonably well with the measured data.Key words: depth-averaged model, sediment transport, sediment-carrying capacity.

Sediment Transport over Deposited Beds in Sewers

1994 ◽  
Vol 29 (1-2) ◽  
pp. 125-133 ◽  
Author(s):  
C. Nalluri ◽  
A. Ab. Ghani ◽  
A. K S. El-Zaemey
Keyword(s):  
Experimental Investigation ◽  
Sediment Transport ◽  
Cross Section ◽  
Carrying Capacity ◽  
Rectangular Cross Section ◽  
Correlation Coefficients ◽  
Bedload Transport ◽  
Empirical Equations ◽  
Shape Parameters ◽  
Sediment Carrying Capacity

This paper is based on an extensive experimental investigation of bedload transport of noncohesive sediments at “limit deposition” in channels of circular and rectangular cross-section. The effect of permanent deposits on the invert of pipe channels on sediment carrying capacity and hydraulic resistance to flow is investigated. The sediment transport data from rectangular and pipe channels led to the development of empirical equations with high correlation coefficients. These equations showed the possibilities of their validity for either channel shape with the incorporation of appropriate shape parameters.

The Analysis and Discussion of Sediment Transport Capacity Formula

2012 ◽  
Vol 188 ◽  
pp. 259-263 ◽  
Author(s):  
Wei Yi Zhang ◽  
Gui Ying Lu ◽  
Xi Shan Pan
Keyword(s):  
Diffusion Equation ◽  
Carrying Capacity ◽  
Sediment Concentration ◽  
Two Dimensional ◽  
Transport Capacity ◽  
Sediment Transport Capacity ◽  
Sediment Data ◽  
New Formula ◽  
Sediment Carrying Capacity ◽  
High Application

Combined with the equilibrium condition, the formula of vertical average sediment concentration has been derived from the vertical two-dimensional suspended sediment diffusion equation. Based on analyzing and comparing two hydrodynamic formulas, a new formula of sediment carrying capacity has been deduced. Some river and inshore sediment data has been collected to validate the formula and find that the new formula has higher accuracy and applicability comparing with the two hydrodynamic formulas, it shows that the new formula has a high application value.

Preliminary Study about the Sediment Carrying Capacity Formula

2012 ◽  
Vol 535-537 ◽  
pp. 1771-1774
Author(s):  
Wei Yi Zhang ◽  
Zhen Xiang Wang ◽  
Jun Zheng
Keyword(s):  
Diffusion Equation ◽  
Carrying Capacity ◽  
Equilibrium Condition ◽  
Sediment Concentration ◽  
Two Dimensional ◽  
Preliminary Study ◽  
Sediment Data ◽  
New Formula ◽  
Sediment Carrying Capacity ◽  
High Application

Combined with the equilibrium condition, the formula of vertical average sediment concentration has been derived from the vertical two-dimensional suspended sediment diffusion equation. Based on analyzing and comparing two hydrodynamic formulas, a new formula of sediment carrying capacity has been deduced. Some river and inshore sediment data has been collected to validate the formula and find that the new formula has higher accuracy and applicability comparing with the two hydrodynamic formulas, it shows that the new formula has a high application value.

2D multi-layer hydrodynamic and sediment transport modelling in a tidal estuary

2020 ◽  
Author(s):  
Kai-Yi Bai ◽  
Jiing-Yun You
Keyword(s):  
Sediment Transport ◽  
Shallow Water ◽  
Finite Volume ◽  
Stokes Equations ◽  
Transport Model ◽  
Three Dimensional ◽  
Sediment Concentration ◽  
Computational Domain ◽  
Operation Rules ◽  
Sediment Transport Model

<p>This study developed a multi-layer hydrodynamic and sediment transport model for simulating tides and the estuarine flows. The flow circulation in an estuary shows complicated mixing and stratification patterns due to the combined effects from currents and tides. This kind of issues becomes more important in Taiwan in line with the more and more frequent sediment flushing operation which led to high sediment concentration flow at the estuary. In some applications,  three-dimensional (3D) models solving full Navier-Stokes equations were used. However, the extremely high computational cost, especially for the large-scale environmental problems, is always a serious concern. In the past years, continuous efforts have been devoted to the development of efficient quasi-three-dimensional models under hydrostatic and Boussinesq assumptions. Following the same state-of-the-art modelling strategy, this study develops a multi-layer shallow-water and sediment transport model with finite volume method. In this model, a terrain following coordinate with high local resolution is used to vertically divide the computational domain into multiple layers to better addressing bottom topography and velocity profile. Our model is rigorously validated against several benchmark cases including winddriven circulation, subcritical flow over a hump, tidal wave propagation, and sediment transport. The grid convergence test and accuracy both are in good agreement with analytical solutions. Subsequently, the model is applied to investigate the estuary dynamics and sediment transport under different conditions, e.g., flow discharges, bottom slopes, wind shears and tidal variations. Overall, the results show a relationship between flow conditions and sediment transport. Later, some scenarios for various upstream inflow and sediment concentration will be examined to assess the reservoir operation rules. </p><p><strong>Keywords: shallow water, sediment transport, multi-layer, hydrostatic, Boussinesq Assumption, a finite volume characteristics (FVC) method </strong><br> </p><p><br> <br> <br><br> </p>

Influence of wave and current flow on sediment-carrying capacity and sediment flux at the water–sediment interface

2014 ◽  
Vol 70 (6) ◽  
pp. 1090-1098 ◽  
Author(s):  
Jun Zheng ◽  
Ruijie Li ◽  
Yonghai Yu ◽  
Anning Suo
Keyword(s):  
Sediment Transport ◽  
Carrying Capacity ◽  
Superposition Principle ◽  
Transport Processes ◽  
Sediment Flux ◽  
Spatial And Temporal Scales ◽  
Significant Wave ◽  
New Formula ◽  
Sediment Interface ◽  
Sediment Carrying Capacity

In nearshore waters, spatial and temporal scales of waves, tidal currents, and circulation patterns vary greatly. It is, therefore, difficult to combine these factors’ effects when trying to predict sediment transport processes. This paper proposes the concept of significant wave velocity, which combines the effects of waves, tides, and ocean currents using the horizontal kinetic energy superposition principle. Through a comparison of the relationship between shear stress at the water–sediment interface and sediment-carrying capacity, assuming equilibrium sediment flux, a new formula for sediment-carrying capacity, which incorporates the concept of significant wave velocities, is derived. Sediment-carrying capacity is a function of the critical velocity, which increases with water depth and decreases with increasing relative roughness of the seabed. Finally, data from field observation stations and simulations are used to test the proposed formula. The results show that the new formula is in good agreement with both field and simulation data. This new formula for sediment-carrying capacity can be used to simulate nearshore sediment transport.

scholarly journals Modeling Hydro-Dynamics in a Harbor Area in the Daishan Island, China

Water ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 192 ◽  
Author(s):  
Yuting Li ◽  
Zhiyao Song ◽  
Guoqiang Peng ◽  
Xuwen Fang ◽  
Ruijie Li ◽  
...  
Keyword(s):  
Sediment Transport ◽  
Flow Velocity ◽  
Suspended Sediment ◽  
Hydrodynamic Model ◽  
Transport Model ◽  
Measurement Data ◽  
Cross Flow ◽  
Sediment Concentration ◽  
Suspended Sediment Transport ◽  
The Impact

This study presents an incorporation and application of a two-dimensional, unstructured-grid hydrodynamic model with a suspended sediment transport module in Daishan, China. The model is verified with field measurement data from 2017: water level, flow velocities and suspended sediment concentration (SSC). In the application on the Daishan, the performance of the hydrodynamic model has been satisfactorily validated against observed variations of available measurement stations. Coupled with the hydrodynamic model, a sediment transport model has been developed and tested. The simulations agreed quantitatively with the observations. The validated model was applied to the construction of breakwaters and docks under a different plan. The model can calculate the flow field and siltation situation under different breakwater settings. After we have analyzed the impact of existing breakwater layout schemes and sediment transport, a reasonable plan will be selected. The results show that the sea area near the north of Yanwo Shan and Dongken Shan has a large flow velocity exceeding 2.0 m/s and the flow velocity within the isobath of 5 m is small, within 0.6 m/s. According to the sediment calculation, the dock project is feasible. However, the designed width of the fairway should be increased to ensure the navigation safety of the ship according to variation characteristics of cross flow velocity in channel.

scholarly journals A Process-Based, Fully Distributed Soil Erosion and Sediment Transport Model for WRF-Hydro

Water ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1840
Author(s):  
Dongxiao Yin ◽  
Z. George Xue ◽  
David J. Gochis ◽  
Wei Yu ◽  
Mirce Morales ◽  
...  
Keyword(s):  
Sediment Transport ◽  
Soil Erosion ◽  
Transport Model ◽  
Model Performance ◽  
Sediment Concentration ◽  
Rain Gauge ◽  
Channel Processes ◽  
Concentration Data ◽  
Rainfall Events ◽  
Sediment Transport Model

A soil erosion and sediment transport model (WRF-Hydro-Sed) is introduced to WRF-Hydro. As a process-based, fully distributed soil erosion model, WRF-Hydro-Sed accounts for both overland and channel processes. Model performance is evaluated using observed rain gauge, streamflow, and sediment concentration data during rainfall events in the Goodwin Creek Experimental Watershed in Mississippi, USA. Both streamflow and sediment yield can be calibrated and validated successfully at a watershed scale during rainfall events. Further discussion reveals the model’s uncertainty and the applicability of calibrated hydro- and sediment parameters to different events. While an intensive calibration over multiple events can improve the model’s performance to a certain degree compared with single event-based calibration, it might not be an optimal strategy to carry out considering the tremendous computational resources needed.

scholarly journals SIMULATION OF SORTING SEDIMENTATION IN THE CHANNEL OF HUANGHUA HARBOR BY USING 3D MULTI-SIZED SEDIMENT TRANSPORT MODEL OF EFDC

2011 ◽  
Vol 1 (32) ◽  
pp. 22
Author(s):  
Qinghe Zhang ◽  
Feng Tan ◽  
Tao Han ◽  
Xiaoyuan Wang ◽  
Zhiqiang Hou ◽  
...  
Keyword(s):  
Sediment Transport ◽  
Transport Model ◽  
Sediment Concentration ◽  
Bohai Bay ◽  
Storm Events ◽  
South West ◽  
Sea Bed ◽  
South West Coast ◽  
Efdc Model ◽  
High Sediment

Huanghua Harbor, located in the south-west coast of Bohai Bay, China, has frequently encountered severe channel siltation with sorting sedimentation along the channel during storm events since its construction. For prediction of channel siltation, a 3D numerical model of multi-fraction sediment transport based on the coupling of modified EFDC model and SWAN model is developed to investigate the sediment transport. It is shown from simulated results that the sorted sedimentation in the channel was well simulated in storm events, and the high sediment concentration near sea bed for silty coast during storm process can also be basically reflected by the model.

scholarly journals APPLICATION OF A SEDIMENT TRANSPORT MODEL

1976 ◽  
Vol 1 (15) ◽  
pp. 69 ◽  
Author(s):  
C.A. Fleming ◽  
J.N. Hunt
Keyword(s):  
Sediment Transport ◽  
Water Intake ◽  
Nuclear Power ◽  
Transport Model ◽  
Numerical Models ◽  
Cooling Water ◽  
Sediment Concentration ◽  
Wave Climate ◽  
Wave Refraction ◽  
Wave Statistics

A mathematical model for sediment transport under waves has been developed from concepts that have been used successfully for unidirectional flow. This model has been combined interactively with numerical models of wave refraction, wave diffraction, longshore currents and circulation currents in order to predict local topographical changes in the vicinity of a cooling water intake basin for a nuclear power station. The sediment model is calibrated using field data of sediment concentration profiles. Verification and adjustments may be made by analysing deep water wave statistics corresponding to periodic beach and hydrographic surveys. The model can be used to investigate the effects of any wave climate and consequently different layouts of coastal structures can be examined very rapidly. For the particular problem considered it was necessary to optimise the configuration of the breakwaters forming a cooling water intake basin in order to minimise the sediment concentration at the intake, estimate maintenance dredging quantities and investigate extreme events.

scholarly journals Investigating Suspended-Sediment Transport in a Shallow Lake Using a Three-Dimensional Model

2017 ◽  
Author(s):  
Hong-Ming Liu ◽  
Wen-cheng Liu ◽  
Chih-Yu Chiu
Keyword(s):  
Sediment Transport ◽  
Suspended Sediment ◽  
Shallow Lake ◽  
Suspended Sediment Concentration ◽  
Transport Model ◽  
Three Dimensional ◽  
Sediment Concentration ◽  
Suspended Sediment Transport ◽  
Sediment Distribution ◽  
Mean Current

A three-dimensional, unstructured grid, hydrodynamic and suspended-sediment transport model (i.e., SELFE-SED) was developed to simulate temporal and spatial variations of suspended sediment and was applied to the subtropical subalpine Tsuei-Feng Lake (TFL) of Taiwan. The model was validated with measured water level and suspended‑sediment concentration in 2009, 2010, and 2011. The overall model simulation results are in quantitative agreement with the observational data. The validated model was then applied to explore the most important parameter that affects the suspended-sediment concentration and to investigate the effect of wind stress on the mean current and suspended‑sediment distribution in this shallow lake. Modeling results of sensitivity analysis reveal that the settling velocity is a crucial parameter and erosion rate is less important in the suspended-sediment transport model. Remarkable lake circulation was found based on the strength of wind speed and wind direction. Strong wind would result in higher mean current in the top layer and suspended-sediment distribution in the top and bottom layers. This study demonstrated that the wind stress played a significant influence on mean circulation and suspended-sediment transport in a shallow lake.

Sign in / Sign up

Export Citation Format

Share Document