Modify terrain in Ras Mapper HEC RAS 2D

hello we are talking today about terrain modification so we are gonna use this example in a lardel in Norway and we are gonna do several things that I'll show in the EDM that are creating this wall creating this Channel and this building in the middle of the river please don't do this super artificial things use them for better purposes and what like restoring reverse and so on but this is just an example to to learn to use these tools and get the results like this is yeah so let's go for it I use okay we will use the a starting DTM and first of all I'll clone the terrain so right click on the terrain clone terrain and we are gonna call it modifications okay awesome so now I have this DTM that I like to set the update layering with the bu plot Contours and every one meter awesome um yeah from here we will right click on modifications edit layer and add modifications and for creating the wall we are going to use align High Ground we are going to call it whoa um we'll just draw uh go from here here here here and you can see we can in real time see the modifications that we do which is really user friendly for example here we could use a top width of five and yeah we could modify that the slope of the of the sides let me put it steeper and maximum extent produced 20 here are different settings because we could here I choose the higher so it means that where these settings are higher than this terrain they will modify the values but if not it will not modify the values what happens if I say replace we can see that this slopes goes a as far as I said say the maximum extension if I choose 100 just to accelerate it it will be a lot bigger but if I say no just modify when it is higher than the domain okay then whenever it crashes into the terrain it will stop okay and then we can also see the the longitudinal profile and the we could also modify these points where I could say start from a 12 meter high set in and then okay automatically this side has come up a just so you know maybe you have already a design of different solutions yeah and now we are going to create a channel this is also super useful when we have dtms where we can not see our River but we still need to do a float model we can't draw it so imagine I have this is a DTM on its own but and I know there is a river going through this area but I I don't have it but I can more or less guess how big it is then I will go to modification and verification lines Channel call it River and I'll draw here here here awesome and then I'll bottom width of 20 yeah it's okay I'm the same you can play with this uh with this different settings if in this case it's interesting okay if my values are lower than that already then change it because I want to make a channel but if I just say replace it will just this 100 and this is very big and it even puts a higher values than I have in my Terrain so I think in this case the option of a lower is the most efficient okay and then it is ready I can do the house like with the right click add notification polygon multipoint a house in the middle of the river please never do this we don't we don't built in the middle of the river we respect Rivers but this is very useful when I am doing a flood model and I need to see the the buildings so I can just right click and double click finish and I'm gonna call it a building replace the ring value with an elevation of five meters awesome be aware that if I already have a built-in shape file I can input it here add existing layer and I could go to it and go to tools and copy the features so I copied from a shape file that I have and then I come here and I paste the feature I can use the same polygons but they should not have holes because then it creates a problem for requests so let's try to keep Simple polygons with the out Outer shape awesome so we can just stop qualifications uh to save yes and then important we go to Geometry right click on it Mana geometry associations and I choose the one that I had in this case modifications that I already I just draw s and we can compute five safe plan as three modifications as you can see I just did the Spanish version of it okay okay and here I put the same stuff okay and we cook it you can see it starts really nice with some iteration with the Kura number and we can see for example that there is a problem in the cell 2048 with with one centimeter maybe if we were interested check where is this problem and if it is due to our modifications we can go to the geometry click on it find cell 2078 okay and it's in this one did I get right was it 2078 abroad 2048 I didn't even 20 48. yeah so yeah just in case you want to check where are the cells that are giving you the most problems but this yeah it's done and we have a very big size so these are not so big errors uh I guess we go here and we can see our results then turned so what happened with the house the house is covering water oh my God 180. maybe my house was not very big what happened here let's go through how big it is [Music] five meters why do I have water in here I don't get it ah did I remove this is deeper here okay I did something wrong okay I think this is a good opportunity to learn but I did not save the house or something and if I go to Elite polygon modification value five meters okay stop yes it seems like I did a whole rather than a house learn it the rain associations and I have the last one notifications why is it one meter lower restaurant let's see okay because I don't understand the depths let's look at the water surface Innovation maybe I get the hint it's the same let's look at the rain what happened with the terrain this is five ah because it has a constant elevation of five so I did not add five to the terrain I just set the constant elevation of five so if I go to right click edit polygon is add value to the rain yes that's what I did for me yeah I ain't got it now and it's that this is automatically updated once I updated the ring here so the calculations have been done with the mistake that I have but now I introduce this value to the ring and it's automatically update you can see that we even have the whole of the house so yes okay it worked and we even had a mistake to learn from and yeah I hope you find it useful and now you know if you need to do some containment works for for floats but uh or a channel if you need for a river or yeah it's very useful and I I hope it serves to you bye bye

Channel: Ana Juárez Gómez

Views: 9,233

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Id: FEGf4wEUMAA

Length: 10min 48sec (648 seconds)

Published: Tue Feb 28 2023