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Sediment Transport - Science topic
Explore the latest questions and answers in Sediment Transport, and find Sediment Transport experts.
Questions related to Sediment Transport
What is the relationship between terminal lake sediment lithology, downcutting of the middle and upper river and the erosive materials produced, and river sediment transport?
Looking for R package/s for in the field of soil erosion/sediment estimation and analysis.
Any comment or hint would be welcome.
I am currently trying to use the CERC formula to calculate the sediment flux during a period of time. I am having trouble figuring out what is the time component in the formula.
My data contains Hs/ dir/ period in 3 hour interval.
thanks,
Jonathan
Unraveling the Essential Effects of Flocculation on Large-Scale Sediment Transport
Patterns in a Tide-Dominated Estuary .
i need data of above topics for my research purpose . can i have it .
Dear Researchers
As well as Please guide me for the name of your favorite book on open channel flow for your research and academic activities
Cheers
Narges
I want to develop sediment transport 2D model and flow 2D model on floodplain river. What is te best software package for it? How can I get them? What is process of acquiring CCHE2D. FLOW 2D, SRH 2D, Delft 3D, Ansys or CFD kind software with full version?
Dear All,
I have an issue regarding a sediment transportation simulation. I have computed the sediment transport rate based on a 20 years wave climate, and simulated the sediment drift for the total time span and either by monthly filtering of the data, the monthly sediment transport is also computed. However there is a problem that the summation of monthly sediment transport is much more than what I have calculated for the total time span. Is it possible this happening? Is there any reason behind this?
I appreciate it if you could share your Idea with me.
Best
Saeideh
Dear All,
I have an issue regarding a sediment transportation simulation. I have computed the sediment transport rate based on a 20 years wave climate, and simulated the sediment drift for the total time span and either by monthly filtering of the data, the monthly sediment transport is also computed. However there is a problem that the summation of monthly sediment transport is much more than what I have calculated for the total time span. Is it possible this happening? Is there any reason behind this?
I appreciate it if you could share your Idea with me.
Best
Saeideh
I'm finding a 3D hydrodynamic model that considers the processes of water & sediment quality and sediment transport at the same time.
Delft3d seems to be a good one, as Delft3d-WAQ couples the deposition of organic matters and sediment transport and wave can be computed as well.
SCHISM seems to be another good model system as it contains all needed module, however, I'm not sure if it can work as Delft3d-WAQ.
Therefore, I want to ask:
1. Is SCHISM okay for the above requirements (considering the processes of water & sediment and sediment transport at the same time)?
2. Is there any other models that meet these requirements?
Your help will be the most grateful.
Hello all,
I intend to perform a CFD analysis of the well-known bridge pier scour problem. I am considering two software packages for this purpose: Ansys Fluent and Flow 3D. I am trying to explore the pros and cons of each package for my case.
I would appreciate your comments on any of the following.
1- In order to make a sound comparison, I need to understand the modelling details implemented in Flow 3D, especially a clear description of the way sediment transport is modelled and coupled with the hydrodynamic solver, and how the interphase interaction is realized. Despite lots of research, I have not been able to find detailed information on this.
2- Any study on comparing the performance of these two packages for bridge pier scour problem.
Regards,
Armin
Hi,
I am working on numerical modeling of a two-phase model for the sediment transport problem
based on the SPH method.
According to previous research and works, none of them mentioned the calibrasion of numerical models and only the validation of the models were done by comparing the numerical results with the laboratory results of common samples such as dam break test cases.
Is calibrasion required for such numerical model?
What is the best option for the calibrasion of results from this numerical modelling?
Also please name your favorite book of Open Channel Flow/Hydraulics you follow for your research and academic activities.
In shallow regions near the coast, sediment transport models require some geomorphological properties of the sea bed. Is there any database that contains d50, d16, d84, some cores to know the kind of material in layers?
Hello everyone,
I am creating a sediment transport model using HEC-RAS (v 6.1) in 1D.
I want to compare a simulation in a fixed bed condition (erosion not allowed) with another in a mobile bed condition (erosion allowed).
In order to consider the fixed bed, I have set the value of the Max Depth to zero in each section. Unexpectedly, the model shows that Mass (Vol) Out Cum is greater than Mass (Vol) In Cum. (Attached images)
How can I explain this? Have I set the wrong condition for a fixed bed?
Thank you for your answer
I am using HEC-RAS 6.0.0 Beta (Update 1), operating system: Windows 10, 64 bit.
I was performing simulations of sediment transport in a rectangular channel, with quasi-unsteady flow. I used different simulation times, and I had no problem at the beginning. Using the same files for geometry and sediment boundary conditions, changing only the duration of flow and temperature series and the ending time in the simulation time window, I faced this error running the simulation: Error:
Geometry Filename was not specified.
Error Processing Geometry
I attach all files and a picture of the error I got.
Could you help me, please?
Increased runoff under the influence of hydrophobia.
Dear Colleagues,
Kindly guide
Suppose we want to calculate the monetary costs of the sediment retention services provided by natural vegetation for providing the clean drinking water supply to people, how to do that?
Regards
Gowhar Meraj
My assessment of Different Hydraulic/Morphology Models
I get a lot of questions regarding which model to use for Hydraulics and Morphology. The answer will be depends on the case and the required output. Here is my take on different available Hydraulic and Morphological models (Not in order of preference)
Mike 21 GPU
Mike 21/3 GPU is the most robust and stable software for your purpose. However it’s not very user friendly and has a steep learning curve. It’s very expensive and the post processing is also a pain. It’s the first choice for commercial use.
Delft3D
Delft3D FM has the capability but still there are many bugs that will have to be resolved. Also not having Geo referencing capability based on co- ordinate in the mesh generation process is a limitation of Delft3D. With no GPU capability the run time could be long.
TUFLOW GPU
TUFLOW GPU is becoming popular and can be used with SMS and QGIS, but there is significant learning curve.
FLOW3D
FLOW 3D is alternative for physical modeling, and it’s not suitable for large scale modeling.
CCHE2D
CCHE2D does not have a very wide user base, so documentation and help could be limited. Also the free version has limited mesh size.
Aquaveo SMS
Aquaveo SMS has a very user friendly interface, so can be learnt very quickly. Pre and post processing is great. Some great tools for riverine modeling with sediment transport. With several modules for waves and sediment transport, but again the capabilities are not well documented due to limited user base for wave modeling.
HEC RAS 1D and 2D
HEC RAS being is good for basic learning. Suitable for steady state and unsteady state modeling. Though I am not fond of the unsteady state modeling, as previously it had a lot of issues and has a lot of limitations. The 2D module has no sediment transport capability. For the 1D model the sediment transport has plenty of bugs and the output is useless. Not a choice for complex riverine unsteady riverine modeling requiring morphology.
Telemac 2d
Suitable for Academic purpose mostly with limited documentation and manuals.
FLOW 3D is a one-phase numerical model with empirical equations for bedload transport, but OpenFOAM is a physics-based code.
Dear coastal and river engineering researchers,
I would appreciate some help from people who may be familiar with Flow, Sediment, and Wave related software with regards to the following:
- Is it possible to utilize SSIIM to model a combination of Flow, Sediment Transport, and Wave?
- What is the best software for simulation of flow, sediment transport, and wave combination?
Best regards,
Maryam Akbari
In HEC RAS model the software run my 1D-2D coupled data, but in RAS mapper result section this problem arise. How can i resolve this?
I have a .XYZ file which contains SPM concentration over an area. The file is representative of an instantaneous time. I wish to prepare a .dfs2 file of this information in MIKE DHI.
The effects of land change and variability on river flows have been widely studied, but is there a new models to quantify and estimate this impact.
studying hydrodynamic mechanism and sediment transport in coastal areas
We're developing a distributed sediment transport model but lack an effective way of estimating D50, which is a sensible parameter in most transport capacity equations. Data that we have includes river width, stream order and upstream area as well as daily runoff and water level.
Would there be a simple way to estimate D50 in each river cell based on these parameters? Thank you very much!
I am trying to model sediment transport through a porous breakwater device in a laboratory tank. Which software would be most efficient in solving sediment transport problems?
I attached the CFD model wave actions using one software. This software does not have to function to solve sediment transport related problems. I now need to add sediment particles in the water (with the model shown) and measure the rate/mass of transport.
I have problems with the software, dont run the simulation
Hi, i noticed on youtube that a lot of researchers change the unit of the degree slope map to radians on raster calculator while the original formula stays in degrees. because if we work by degrees, the result will be negative values, on the other hand in radians, there will be positive values.
Best regards
Lots of attempt have been made to analyze sediment transport processes within submarine canyons using numerical modeling technique. What other importance could the said modeling serve?
Since the 1960's, several flow processes like turbidity current, gravity flows (debris flows, hyperpycnal flows etc), subaerial erosion, eustatic sea level fall, slope failures and few other processes have been published to initiate submarine canyon evolution. However, no clear canyon development processes down dip the ocean environment is yet explained in recent time.
Though few authors claim mass waisting is one obvious means of progressive canyon development through sediment transport but, I would like a more insightful and detailed answer.
I want to calculate watershed health using different parameters. The above mentioned parameters are part of the analysis.
In a 12-meter-long straight channel, a gate with a pneumatic jack has been employed at about a meter before the butterfly outlet gate (used for adjusting the water height) so that it would be used to generate positive surge. When the gate is closed suddenly (in about 0.2 second), it causes an increase in the flow depth and thus conversion of the flow from steady to unsteady, the fact which results in wave progress. I would like to know whether this type of positive surge resulting from sudden closure of the gate (whether with an approximately 2.5 cm opening, or with a complete closure) could be modeled in a straight channel using Flow3D? what software program may be used for its simulation?
Best regards,
Maryam Akbari
I am writing my masters thesis in geology about sediment transport measuring currents with ADCP and doing sediment grains size analysis. Can anyone advise some methods or analysis I can do with this data?
Hyperpycnal flows have been described as density underflows derived from the direct input of a sediment-laden fluvial current into a water body. Because of this definition, velocity profile and duration of hyperpycnal flows would reflect that of the parental river flood, and, typically, would have a steady and waxing-to-waning behaviour different from classic turbidity currents that are surge-like, waning flows. Facies models commonly include hyperpycnal flows as a type of sediment gravity flow, a group of flows in which sediment is transported downslope due to its excess density. Sediment gravity flows differ from hydrodynamic (fluvial) currents by the fact that in the former gravitational forces act directly onto the sediment and not onto the fluid as in a river current. So, if fluvial streams and hyperpycnal flows form a downslope continuum, can we label hyperpycnal flows as a kind of sediment gravity flow?
I am currently analysing the processes and sources of sediment in East-African rivers, lakes and floodplains using sediment tracing techniques. However, in all the soil plot samples and floodplain cores, we find a very distinct distribution of Cerium. My study site is located closely to the active carbonatite volcano 'Ol doinyo Lengai'. We are exploring the possibility of the redistribution of Cerium by the volcano, where besides traditional weathering processes (bottom-up from the mother material), the element is periodically infused from the atmosphere following volcanic eruptions giving rise to its peculiar surface distribution and floodplain peaks.
Is there anyone who has observed this behaviour of Cerium (or other elements) in East-Africa or other parts of the world? It would be a great help to me if you could share some of these findings.
With kind regards,
Maarten
I am looking for a high/good resolution bathymetry values along coastal India. MIKE C Maps are not freely available. I would be glad if someone shares it for research purpose. I would further like to know about other alternatives for bathymetry data. My work is on wave climate and long-shore sediment transport along the Western coast of India. Also land subsidence in deltas and its influence on floods along East coast of India.
We are looking at the effects of offshore wind farms on the hydrodynamics and sediment transport to assess the changes that a wind farm may induce in the Yucatan shelf. Our preliminary studies show that there is barely any effect and we would like to compare to other studies. We found some academic work, but it may be interesting to see reports from existing wind farms. Thanks! -Christian
Can we say that sediment remobilization, transportation, and deposition processes are sub-sections of sediment redistribution process?
The behaviour of the depositional surface over time is described by the sediment conservation equation, and is a function of the downwind sediment transport rate amd the concentration of sediment in transport over time, the latter measured largely by average dune height. The depositional surface rises over time, where the sediment budget is positive or influx exceeds outflux, and the balance is stored as the accumulation. A change from a positive sediment budget, where an accumulation forms, to one that is neutral (influx = outflux) or negative (influx < outflux) results in a bypass or erosional super-bounding surface, respectively. The super surface, therefore, bounds the accumulation, and accumulations and their capping super surfaces are the basic building blocks of eolian sequence stratigraphy.
- G. Kocurek
- K.G. Havholm
Most of sediment supply in mountain rivers comes from punctual events. These events can trigger hyperconcentrated flows or Debris Flows (DF) in headwater streams. However, I do not know any model linking sediment volume from DF and sediment transport during typical hydrological years. Do you know one please?
My aim is to study the interaction of the tidal turbines on the environment, with a focus on sediment in the ocean. Thanks for your advice...
This system of alluvial fans fall in Eastern side of Egypt. Flash floods flow to the sea with huge sediment load.
it is required to study this process to find out the change in the topography in that region due to repetitive flood events and the change in sea shore line as well.
Please suggest references and software.
I need to know about hydraulic structures used to trap sediment transport in rivers in order to protect the intake structures of small power plants from getting clogged. I would appreciate some good book names, journal papers, websites, experiments, etc.
Many thanks in advance.
Zafer Bozkus
Looking at the SWE equations and at some discretization I found that it was argued here and there that the diffusion part can be neglected since it is somehow contained in the bottom roughness part. Clearly, turbulent diffusion takes energy out of the system but in contrast to the roughness term this is marginal. I would rather say that turbulent diffusions is mimicked by numerical diffusion of lower order schemes and that in the absence of numerical diffusion higher order schemes can be terribly wrong if turbulent diffusion is neglected. Moreover, I would really questions all this simplifications and rather go for even solving for the transport part of turbulence since this is important in 2d models for the horizontal advection of turbulence, which is quite important for many applications like sediment transport or simulation of 2ndary currents. Otherwise, I think that eddying regimes cannot be really reproduced by such crude simplifications. However, I did now wrote several SWE codes on unstructured grids during the last year and I am just now starting to take a deep look into it and therefore I would be thankful for some discussion in this direction.
Currently studying a similar topic (application of CFD to monitor effects of sediment transportation within the vicinity of bridge piers), wondering if you had much luck with this topic and fluent, and if you have a paper you could share? Chris
Who can give me informations about a fossil finding out of the Middle Miocene Upper Freshwater Molasse from Untereichen-Altenstadt (western part of Bavaria, Southern Germany)?
In 2009 there I could find a fossil fragment (~ 20 x 10 cm) of a limb bone from a proboscidian (Proboscidea indet., perhaps Deinotherium => a mandibular fragment and several teeth of Deinotherium bavaricum came out very in the near of the limb bone fragment). Object storage: Coll. of the State Museum of Natural History Stuttgart.
The surface of this fossil bone shows an unusual structure with maximum diameters of ~ 4 x 2 cm, maybe a pressure mark from an object laying directly above the proboscidian bone before the process of fossilisation started (see fotos attached). Can anyone help me to identify, what happened with the proboscidian bone from Untereichen-Altenstadt before it petrified?
Thanks and best wishes;
Volker
For hydropower development, need to calculated sediment deposition study,
The watershed management practice is trapping the water along with the sediments, which used to be transferred to the estuary region. These sediments in turn transported to the coasts, the food for that landscape !
River, soil-bank erosion, sediment transport, hydraulic jump,etc.
From the watershed and sediment management point of view, which aspects and effective factors of Functional and Structural sediment connectivity should be paid attention?
Does anyone know about the sediment transport in bend of channels or river?
I want to know about the modeling problems in channel's bend. Also, I want to know about the secondary flow in this phenomena.
Actually I am trying to have an idea on sediment concentration along sea shore. But, I do not have any sediment data for sea of that study area. I want to know if it is possible to calculate Representative sediment concentration using WAVE and WIND current.
What are the main differences and similarities between Functional and Structural sediment connectivity?
Can we say they are acting in watersheds independently?
The Mouse delve many channel in soil plot.
Photo is attached.
I'm currently screening for marine halophiles that have the ability to degrade alkanes (hexane, heptane, etc.) and am limited to culture-based methods. What's the best way to do this while taking in to consideration how volatile the hydrocarbons are?
Dear colleague, I would like to calculate sediment transport in a little stream (10cm depth with a current of around 0.2 m/s).
I'm looking for simple formulae using simple parameters and/or a software. I'v already tried Schoklitsch and Rickenmann, but i'm not sure of the results... (0.0004 m3/s/m) It seems quite important.
What do you think ?
thanks
regards
Alveolina and Nummulite from Early Ypressian in Egypt, I need your kind help to identify them specifically and their precise age assignment. Also, if you can recommend me Professor of Larger Foraminifera for contact about that issue?
Hello,
I want a complete database on dams in North Africa (Morroco, Algeria, Tunisia).
I have already collected a databases "GRanD" and "AQUASTAT" , but they only contain large dams. I want to complete my database by small dams.
Thank you in advance if you have ideas to find these small dams.
hi,, I'm working on sediment transport problem with CFD, while creating mesh, the minimum sediment particle size is 0.65mm, so in order to track and analysis sediment particle, I need to make my minimum element size of mesh is lesser than 0.65. or I can increase the grid size. please help me,, thanks
I would like to know the practice of municipal council throughout the world on their practice for sedimentation cleaning of sewer. The paper by Lange and Wichern (2013) published in Water Science & Technology (Volume 68; Issue:4, 756-762) titled "Sedimentation dynamics in combined sewer systems" stated that in North Rhine-Westphalia, MURL (1995) suggested to clean the sewer when the sediment deposit reaches 15% of the pipe diameter. Is there any technical justification for this? If so, what are the reference that I can referred to?
I want to simulate bead collision in fluid, the bead size is similar to the fluid flow characteristic length, e.g. 1/5 of flow depth. I found that most of existing CFD-DEM coupling code or software can only deal particles which are much smaller that mesh size. And I do believe the wake and other flow features around bead should be resolved in my problem. I am looking for a more direct and simple method than linking a cfd code with dem code using immersed boundary method, anyone get a clue?
Dear All
I am working on numerical simulation of morphological changes in behind submerged breakwaters. At the present stage I need a set of useful experimental or field data, which could be used for validating the numerical model (in my case, DELFT3D).However, in spite of extensive search for such data, I could not find anything except some studies on emerged breakwaters.
Does anybody know where can I find such data?
In case no such data is available, what is the best approach for model validation?
Kind Regards
I want to model erosion and sedimentation process within a small ungauged catchment. so far i have not yet found a good model that i can use to do so. I came across WaTEM/SEDEM, but i am not familiar with it. I want someone who has used this, to help me. Does it require discharge data?
Basset force is a term defining history of particle motion in any unsteady viscous flow. It is also a fact that due to the lag occurring in the formation of boundary layer in any decelerating or accelerating particle, this term comes into picture. So can it be understood that in flow full of secondary circulations generated by inflexion in shear stress, Basset force will be a dominant force?
Let us consider I have a small dam on which I would like to perform and analysis of siltation and model its dynamics.
What could be some appropriate models for that ? Depending on the model to be used, what kind of data do I need to gather ? If they are historical data, what should be, ideally, on a rough estimate, the appropriate timespan ?
I believe the question is very broad (and possibly not very well stated), but I am mostly interested in the approach. In case one has already performed a siltation modelling case, some links and ideas would be very much appreciated. Thanks.
I have been coming across this term for more than 10 times still do not understand it, I have not found any simple or comprehensive meaning of the term, but it appears a lot in the literature I read for my research.
I want to calculate the sediment delivery ratio(SDR) in a small watershed(area<1 km2) based on RUSLE and DEM (5*5m), what should the procedures be ?
Dear all,
I read some papers on both FVM and DEM for simulating sediment transport in channels and each of them has had good results. Regarding that FVM is better for fluids simulation (considering the volume for fluids) and DEM is better for particle motion simulation(the heart of DEM is the force between particles), which one finally is better?
Thanks
I am researching about cross-shore sediment transport and I focus on studying long bound wave. Are there any research suggestion about impact of long bound waves on cross-shore sediment transport?
I am trying to develop both numerical and physical model to investigate about the sediment transport phenomena of erodible material from peatland. Could you give me references about this topic?
Thank you
What is the rationale behind the selection of such grain size?
Can somebody provide any relevant references on the methodology for sampling fine grain active stream sediments?
I want to determine speed of sediment based on grain size of sediment. whether researchers here know and can share this item.