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Very cool! This reminds me of how different periods of freezing/thawing (as well as many other processes) create distinct layers of snow and ice crystals over a snow slope - which can be responsible for avalanches.

These Podcasts are really cool, the excerpts with additional complemenary data/videos/graphics makes it super interesting. One thing I would like to see added, is the option of having video format for the whole podcast like Joe Rogan does IT just gives a nice feel to it, Morevoer, these images can be shown in real time, during the podcast with some help ofcourse, Furthermore, these edits can still be continued after the podcasts.

Congratulations Stan! Great acceptance speech!

I love you!! Thank you much.....

Well deserved

Bro, you just found fresh Troll dung!! 😅

It's so much fun to see a former student! I always wonder what the "kids" are doing with their lives. Congratulations, Stan. Well deserved recognition.

BRAVO!!!

Too good to give thanks......but still thank you so much sir❤

Model of How the Grand Canyon was made.

Congrats!!! And thank you for the general tip about using "Rules" for gate controls. I just used it in a Debris Model by assuming the bridge will clog when approximately half amount of material passes through the bridge opening.

Thank you very much for this very useful video, from Cote d'Ivoire (Ivory Coast)

Congratulations!🎉🎉🎉🎉

Very useful, thanks for the lesson! I'm working with this Bingham model in my master thesis. I have a question about the non newtonian Cv parameter: If I set the Cv = 60% and select the "Do Not Bulk" option, then the simulation doesn't take into account the volume concentration? Or is it actually taken into account but its assumed that it is included in the flow hydrograph? (and if so, how does the bulking factor work in this case?) I have been running the model all this time with "do not bulk" option, does this mean I am modeling clear water?

Thanks sir. thats helpful for ma paper. How to solve the error, Minimum error exceds allowable tolerance at ??? I am from Afrika Ethiopian 🇪🇹

Congratulations🎉

How to export the clone terrain to a raster for use in arcgis or other programs. Tried to use the export raster option, but it just export the image raster.

🎉🎉🎉

I'am very grateful for people like you.

Interesting! A quick question: how does RAS account for the fluid density of the debris flow mixture, and how to specify the material’s specific grain density? Density is often twice as large as clear water and can have significant impact on flow dynamics. Thanks in advance!

Hello, i have written to you before. I'm working on my bachelors thesis on HEC-RAS sediment moddeling and have run into an issue while hydraulicaly calibraing my model. I have 6 gates in a SA/2D connections opening based on the rules i've set but based on my previous runs it seems like they dont follow the rules at all in fact most of the gates dont open at all. This has left me and all my professors confused since we do not see any problem with my model. Would you please help me because i have been trying to resolve this issue for over a month now and I'm at my wits end. Thank you very much.

Good job Stanford

thank you so much! very helpful!

Wow, even the huge natural arch is gone now.

Thank you for your instructions!

Thank you for this video, greetings from Prague

Hi Dr. Gibson, I want to know the difference between the 2D Initial Condition/WarmUp (Ramp Up hours) and the 2D Sediment WarmUp Periods (concentration, gradation & bathymetry). Do I need both warmup parameters for a 2D Sediment analysis or when I'd need to introduce those 3 sediment warmup periods? Thank you so much for your videos!! (I'm from Peru btw)

Hello! Is there a way to print this results directly from RASMapper Plot? I don't see an option other than a screenshot or snip. Thanks!

Dr. Gibson, please help me. I cant visualize “bed change” in RAS Mapper

When I try and run a model with a dataset and following the instructions in the videos I get the following error: An error occurred while reading sediment data at (blank) review your data at this location for completeness and consistency I checked and there is bed gradation data and all my cross sections and I am testing out my downstream boundary condition as equilibrium load to rule out any errors. What is the overall meaning of this error and how do I fix it?

Is it possible to set up model where there is essentially a dam break of large cobbles and boulders? I was thinking that I could do this by modeling a short burst hydrograph (only a minute long), but am weary that there will be numerical oscillations in the process.

A question: can we run the turbulence model without a sediment transport simulation.I mean just for a 2D inondation mapping ? or not possible because we need to have solutes to solve the equations for the advection.

Hello! Wondering if you have a video on bridge scour calculations? I have not been able to find one but perhaps missed one?

Hello Gibson, I have been following your videos on RAS analysis, and I find them incredibly helpful. I have a question regarding the datum. You mentioned the High-Water Mark (HWM) elevation as 6.4 feet, and you also mentioned some calculations with terrain. Could you please explain a bit more about your datum and how you arrived at the value of 693.4 feet after performing those calculations? I often get confused between HWM elevation and model projections. For example, I have an HEC-RAS model projected in NAD_1983_UTM_Zone_16N. Additionally, I’ve collected HWM data from USGS, "Black Sharpie mark on red fire hydrant 2.25' above ground in the liberty ball field, hydrant is 9.3 meters from edge of parking lot" measure at 278.9 feet above NAVD88. How can I adjust the HWM height and compare it with the RAS-simulated stage?

This content is pure gold! Thanks for sharing! Greetings from Brazil

Thank you / gracias to everyone involved in the making of this video. This geologic event has been fascinating to watch from afar and it has been very interesting to me!

there's equations for sedimentations ?? wow

Hello, Thanks for the video. I'd like to know the HEC-RAS limitations. When we simulate sediment transport, usually we have rivers with steep slopes ( greather than 4%). Which is the max bed slope of the channel that HEC-RAS could handle? could you help me with this question please?

I have a 10' x 10' culvert with water coming out at 17 fps and going into a natural channel. Our 2 ton riprap got washed away with the recent rains here in CA. So now I'm trying to size the riprap so it doesn't get washed away. so I'm making my upstream reference section to be the culvert which has the most velocity. The design section is about 15 ' downstream and I'm using that. So now the question: What section is used for the input data? It's all straight so there is no radius. But the side slope of the reference section is 90 and the side slope of the design section is 35 in the natural channel. So what numbers do I use?

You can find the podcast episode here: podcasts.apple.com/us/podcast/tony-thomas-on-the-origin-of-sediment-modeling/id1650989239?i=1000648600876

Thank for a great video, but how can one go for calibration if one does not has ADCP data

Many thanks Dr. Stanford.

The Tony Thomas episode was extremely informative. Thank you for putting these together.

can I use any similar technique to estimate the sediment rating curve/total sediment load for an un-gaged river?

Hello Stanford, I hope this message finds you well. I wanted to commend you on the superb content and engaging work you've been producing. I have a question regarding the "Concentration Only" Mode. Currently, I am in the process of calibrating experiments conducted by GUTA at LEGI LAB Grenoble, France, using HEC-RAS 2D. The setup involves different settings of incoming loads (below capacity) categorized as LOW, MED, and HIGH, with a flume width of 0.35m. I've encountered a few challenges: 1. Firstly, I am working with a particle density of 1192 kg/m³. Utilizing "User Defined Grain Classes," I inputted SG = 1.192 and BD = 655.6 kg/m³ with a porosity of 45%. I also adjusted the classes' diameters as required. My question is, does this approach work effectively? 2. Secondly, when inputting the upstream inflow boundary condition, whether using the Rating Curve or Time Series, I entered a value of 2 tonnes/day, which translates to 0.078 kg/m/s. However, the Results Map for "Total Load Transport Capacity" is indicating a significantly lower value of about 0.003 kg/m/s. Which Results Map should I refer to for the sediment rate or flux? I find it peculiar that the induced value is not reflected accurately in the model. Any insights on this discrepancy would be greatly appreciated. 3. Thirdly , is there a way to separate the sediment boundary condition from the flow boundary location? In the lab flume, the inflow is controlled by a hopper/funnel, positioned precisely. Is there a workaround for this? Your expertise and guidance on these matters would be invaluable. Thank you for your time and assistance. 4. Lastly, I'm interested in understanding how to utilize the Non-Erodible Method in Adaptation Parameters. Could you please provide guidance on its implementation?

Thank you for this. That last bit about the checking the cell elevation that the structure is connected to helped me solve the error on my model.

Hello, thanks for the tutorial. How do you "define your own grain classes" ? This log2 scale is really not convenient and I was not able to find where to customize it. Thanks in advance !

Where is Eddie's PFD?

very cool, will look for this..

Great video, Stanford! Thanks for sharing. Bridges still seem like a bit of an afterthought at USACE. Getting detailed info through bridges is primary importance for DOT's and other owners. This is a good procedure toward that end. Our group will work with this methodology for skewed bridges, column bents, etc. where we need to have good understanding of what's happening under and around our bridges. Hope you'll provide other similar videos in the near future! Also hoping USACE will finally address their outdated scour procedures. Maybe version 7.0?