tag:blogger.com,1999:blog-1675184707067447729.post1101820084421790151..comments2023-07-12T07:12:04.697-07:00Comments on The RAS Solution: Stabilizing a Dynamic Unsteady HEC-RAS ModelChris G.http://www.blogger.com/profile/00354834185663924786noreply@blogger.comBlogger52125tag:blogger.com,1999:blog-1675184707067447729.post-546773625249180702019-09-26T08:49:58.692-07:002019-09-26T08:49:58.692-07:00Great to hear! Thanks for sharing!Great to hear! Thanks for sharing!Chris G.https://www.blogger.com/profile/03272464763887890080noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-83737999675252653562019-09-26T07:23:14.698-07:002019-09-26T07:23:14.698-07:00Thank you Chris. Your article was very helpful. We...Thank you Chris. Your article was very helpful. We were occupied with one of our project for some days without any output. Your solution saved us.<br />Anonymoushttps://www.blogger.com/profile/10728422932782968800noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-56061517513096671652019-05-16T00:56:48.355-07:002019-05-16T00:56:48.355-07:00Yes! it is not a chromatic difference but numerica...Yes! it is not a chromatic difference but numerical!<br />I've extract different shp contour for velocities 0 m/s, 0.25, 0.5, 0.75, and 1 m/s. I've transformed shp to raster using sagagis, and than I merged rasters. I obtained the correct map!<br />This method is indifferent by 5.0.6 or 5.0.7!<br />I solved my question (spending a lot of time extracting 5 shp for all events I studied), but I cannot understand the cause of the error!? It seems as HEC-RAS in stored map subtract to the velocities something dipendent by terrain!. <br />HEC-RAS correctly use terrain to clip the raster and follow morphology, but it mustn't modify numbers of velocity!Tacciomanhttps://www.blogger.com/profile/00669213296648530764noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-40522471423440192782019-05-15T20:46:32.870-07:002019-05-15T20:46:32.870-07:00are you sure you're viewing the same profile (...are you sure you're viewing the same profile (mapping output interval) for both the dynamic and stored map? Chris G.https://www.blogger.com/profile/03272464763887890080noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-51306647895221306402019-05-13T09:25:01.951-07:002019-05-13T09:25:01.951-07:00Hi, I have a complete model 1D/2D. In ras mapper I...Hi, I have a complete model 1D/2D. In ras mapper I correctly exported depth layer. I also visualize correct distribution of maximum velocitys if "Generated for current View (in memory) - Raster (with Associated Terrain)". I'd' like to export also velocitys layer, than i create the layer "Stored (save to disk) - Raster based on Terrain"<br />Now: in Hec-Ras 5.0.6 I obtain the same distribution of velocity, and it is NOT correct!!!!<br />in Hec-Ras 5.0.7 the visualization "in memory" is correct, but the visualization "stored" is not correct!!<br /><br />The only correct visualization is the "in memory" ras 5.0.7... i'd like to export that!!! can you help me?Tacciomanhttps://www.blogger.com/profile/00669213296648530764noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-3169894746597519552019-03-05T07:58:34.971-08:002019-03-05T07:58:34.971-08:00that is more of a note, than an error. But if you...that is more of a note, than an error. But if you wish for it to go away, you could check your elevation-volume curve. portions of your curve that have significant change in Volume for small change in elevation can produce those errors. Try smoothing out your curve. Chris G.https://www.blogger.com/profile/03272464763887890080noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-49422572039811075132019-03-05T03:18:08.992-08:002019-03-05T03:18:08.992-08:00My model is showing the following error:
The maxi...My model is showing the following error:<br /><br />The maximum storage area wsel error was 0.173<br />reserve at 22SEP2010 02:40:00<br /><br />Finished Unsteady Flow Simulation<br /><br />For the past many days I have been trying various options but all in vain.<br />Please suggest me solutions Anonymoushttps://www.blogger.com/profile/02808303598649087524noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-6892613642073828872019-01-31T12:00:16.618-08:002019-01-31T12:00:16.618-08:00All you can get from this computation message is t...All you can get from this computation message is that the model crashed at 1:00 AM on Jan 15th, and it crashed at Dam 1. I would look around your dam. Make sure you have enough cross sections, make sure your channel isn't going dry, make sure you've defined ineffective flow areas if necessary. Make sure your htab parameters are good. Do you have gates on the dam that open too quickly? A breach that forms too quickly? Stabilizing your HEC-RAS unsteady flow model takes a lot of practice. But essentially, you are looking for places and times where any hydraulic parameter changes abruptly. That is generally how errors begin in RAS. Look for that and see if you can figure out a way to lessen the abruptness of change. Chris G.https://www.blogger.com/profile/03272464763887890080noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-5449388476511068842019-01-31T02:08:18.270-08:002019-01-31T02:08:18.270-08:00My model becomes unstable. The following error occ...My model becomes unstable. The following error occurs..<br /><br />Solution solver went unstable, iteration 2 at 15JAN2019 01:00:00<br />Dam 1 197.00* 644.72 12.554<br /><br /> **** ERROR: Solution Solver Failed i have tried out all the above options. Is there some otherway to solve this error. I am using HEC-RAS5.0.6<br />Anonymoushttps://www.blogger.com/profile/13719799968515856659noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-56041902753365978912018-08-21T13:01:03.517-07:002018-08-21T13:01:03.517-07:00I am having the same error, but with RasGeometryPr...I am having the same error, but with RasGeometryPreProcess and this only happens when I model more than 11 culverts in HECRAS 5.0.3 and higher. Could you come up with the solution ?Torres Medina Francisco Josehttps://www.blogger.com/profile/02792540079146521934noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-77953505809085332382018-07-31T12:27:02.612-07:002018-07-31T12:27:02.612-07:00Hi there,what other softwares better then HecRas f...Hi there,what other softwares better then HecRas for unsteady flow modelling?Anonymoushttps://www.blogger.com/profile/02780584164920564478noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-61344753808852310212018-07-02T11:49:13.442-07:002018-07-02T11:49:13.442-07:00Hello Chris.. I got a problem about unsteady model...Hello Chris.. I got a problem about unsteady model. This is the statement...<br /><br />Performing Unsteady Flow Simulation HEC-RAS 5.0.4 April 2018<br /><br /> **** ERROR: Solution Solver Failed ****<br /><br /> Unstable for Initial Iteration at 12MAR2014 2400<br /><br />Writing Results to DSS<br /> <br /><br /> **** The Model Has One Or More Error(s) ****<br /><br />Unsteady Flow Simulation Terminated<br />Reading Data for Post Process<br /> Simulation went unstable at: 13Mar2014 00:00:05<br /> <br />Running Post Processor HEC-RAS 5.0.4 April 2018<br /><br />Finished Post Processing<br /><br /><br />Stored maps were not written because the simulation did not complete.<br /><br /><br />Computations Summary<br /><br />Computation Task Time(hh:mm:ss)<br />Completing Geometry(64) <1<br />Preprocessing Geometry(64) <1<br />Unsteady Flow Computations(64) <1<br />Post-Processing(64) <1<br />Complete Process 2<br />..<br /><br /><br />How to solve this?<br />Can it be caused by hydraulic parameters? or some of the choices in the modelling?. ThanksFKIhttps://www.blogger.com/profile/02502334592207721072noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-14311463597283401262018-06-13T19:28:29.640-07:002018-06-13T19:28:29.640-07:00Hi Chris,
THANKS FOR YOUR TIPS! Is this a good gu...Hi Chris,<br />THANKS FOR YOUR TIPS! Is this a good guideline to correct errors in any unsteady model? I recently ran an unsteady model with constant 1000 cfs, and got no errors. Then I changed the flow to a constant 5000 cfs and got these errors:<br />(WILL I ALWAYS NEED TO CORRECT ERRORS IF I CHANGE FLOWS?)<br />(SHOULD I GET THE CORRECT FLOWS FIRST AND THEN TROUBLESHOOT?)<br /><br />Plan: '1D2D' (2018-06-13 - Agromin FINAL RUN.p01)<br />Simulation started at: 13Jun2018 06:53:02 PM<br />Using 64 Bit Computation Engines<br /><br />Writing Geometry<br />Computing Bank Lines<br />Bank lines generated in 88 ms<br />Computing River Edge Lines<br />River Edge Lines generated in 358 ms<br />Computing XS Interpolation Surfaces<br />XS Interpolation Surfaces generated in 107 ms<br />Computing 2D Flow Area 'Hybrid 2D Area E' tables: Property tables do not exist.<br />2D Flow Area 'Hybrid 2D Area E' tables complete 18.98 sec<br />Computing 2D Flow Area 'Hybrid 2D Area W' tables: Property tables do not exist.<br />2D Flow Area 'Hybrid 2D Area W' tables complete 39.44 sec<br />Completed Writing Geometry<br /> <br />Geometric Preprocessor HEC-RAS 5.0.3 September 2016<br /> 3 Internal Boundary curve(s) have been read in<br /><br />Finished Processing Geometry<br /><br />Writing Event Conditions<br />Event Conditions Complete<br /><br />Performing Unsteady Flow Simulation HEC-RAS 5.0.3 September 2016<br /><br /> Initial Backwater, Split flow optimization, iteration 1<br />Maximum iterations of 40 RS (or Cell) WSEL ERROR<br /><br />13JUN2018 00:30:00 Todd 1 7514.802 237.73 1.588<br />13JUN2018 00:40:00 Todd 1 14819.31 333.42 3.001<br /><br /> **** ERROR: Solution Solver Failed ****<br /><br />Minimum error exceeds allowable tolerance at 13JUN2018 00:40:00<br /><br />Todd 1 7514.802<br /><br />***** Warning! Extrapolated above Cross Section Table at: *****<br /> (The extrapolation may have been caused by model instability)<br /><br /> Todd 1 R.S. 14819.31<br /> Todd 1 from R.S. 13039.92 to 12888.38<br /> Todd 1 from R.S. 9643.186 to 5373<br /> Todd 1 from R.S. 5239.892 to 3841.954<br /> Todd 1 R.S. 2289.187<br /><br />***** Warning! Extrapolated above/beyond Rating Curve (Bridge/Culvert/etc.) *****<br /> (The extrapolation may have been caused by model instability)<br /><br /> At River Todd Reach 1 R.S. 13050<br /> At River Todd Reach 1 R.S. 8150<br /> At River Todd Reach 1 R.S. 5400<br /> <br /><br /> **** The Model Has One Or More Error(s) ****<br /><br />Unsteady Flow Simulation Terminated<br /> <br />Writing Results to DSS<br />Finished Writing Results to DSS<br /><br />Reading Data for Post Process<br /> Simulation went unstable at: 13Jun2018 00:50:00<br /> <br />Running Post Processor HEC-RAS 5.0.3 September 2016<br /><br />Finished Post Processing<br /><br /><br />Computations Summary<br /><br />Computation Task Time(hh:mm:ss)<br />Completing Geometry 59<br />Preprocessing Geometry(64) <1<br />Unsteady Flow Computations(64) <1<br />Writing to DSS(64) <1<br />Post-Processing(64) <1<br />Complete Process 1:01<br />wilkyflexhttps://www.blogger.com/profile/10044444943549507373noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-4065749844527462322018-05-25T11:21:06.683-07:002018-05-25T11:21:06.683-07:00Hi Chris,
I have a problem with running the mode...Hi Chris, <br /><br />I have a problem with running the model. Somethimes it happens, that when I decrease the computational interval in order to make the model more stable, it will be more labile. Can you tell me what can be the reason? <br /><br />Very nice blog, thank you. zitahttps://www.blogger.com/profile/12776042188999448819noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-87084275088168429602018-05-23T07:51:06.954-07:002018-05-23T07:51:06.954-07:00try HTAB parameter, you first try selecting all se...try HTAB parameter, you first try selecting all sections and clicking reset defaults and run the program.<br />If it doesn't work, first of all try selecting all sections only starting elevation column and clicking copy invert and run the program.<br /><br />If you have already the same problem, take note whitch sections the program hilight in the results, and you try growing increment parameter only for that sections, just a little bit a time.<br /><br /><br />If you have to correct so mutch that parameter, may be you had wrond something else.<br /><br />I'm sorry for my english.<br />Tacciomanhttps://www.blogger.com/profile/00669213296648530764noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-58585946312667824862018-05-23T02:01:23.165-07:002018-05-23T02:01:23.165-07:00Hello there i'm running my model on Hec Ras an...Hello there i'm running my model on Hec Ras and i have this error.. An idea to resolve it ? <br /><br />***** Warning! Extrapolated above Cross Section Table at: *****<br /><br /> TORRAS TORRAS from R.S. 1591.581 to 1511.298<br /> TORRAS TORRAS R.S. 1498.451<br /> TORRAS TORRAS from R.S. 209.8040 to 13.84497<br /><br /> <br /><br />The maximum xsec wsel error was 20.591<br />TORRAS TORRAS 1967.767 at 17MAY2018 00:07:23<br /><br /> **** The Model Has One Or More Warning(s) ****<br /><br />Finished Unsteady Flow Simulation<br />Antoinenoreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-63504641464837953012018-05-11T02:10:09.542-07:002018-05-11T02:10:09.542-07:00Hi all,
When i run the HEC-RAS 5.0.1 i got the re...Hi all,<br /><br />When i run the HEC-RAS 5.0.1 i got the result like this. I'v drawn the profile along the river and checked the plot for WSE, but i am not able to understand why the WSE drop is there. Is it modeling mistake or related to something else.<br />Vimal Sharmanoreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-88580481213100110482018-04-15T04:15:03.162-07:002018-04-15T04:15:03.162-07:00hello Good evening, i am working with my 1d/2d mod...hello Good evening, i am working with my 1d/2d model of the irrigation system in philippines. Upon running the model, during the performing of the unsteady simulation, i have encountered these error of "RasUnsteady64.exe has stopped working" May I know what are the deffect and the possible ways to resolve it?? Thank you :)Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-63770537077523900252018-02-07T10:36:06.268-08:002018-02-07T10:36:06.268-08:00Check with Antonio Cotroneo. http://www.cotroneoi...Check with Antonio Cotroneo. http://www.cotroneoingegneria.it/site/en/2016/11/22/corso-gis-ed-hec-ras-2d-roma-01-03-marzo-2017/<br />Chris G.https://www.blogger.com/profile/03272464763887890080noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-5663780593789219182018-02-07T10:25:51.210-08:002018-02-07T10:25:51.210-08:00great!
I'm sorry for my english, I'm itali...great!<br />I'm sorry for my english, I'm italian,<br />I have learned HEC-RAS and HEC-HMS independently. I have often tried to follow a course, but I was always disappointed because they didn't teach me anything.<br />You know show me some course in Italy really valid? I'd like to know not only the basics but the most refined modeling!<br />Thank you<br />Tacciomanhttps://www.blogger.com/profile/00669213296648530764noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-36278558549094286632018-02-07T09:53:16.906-08:002018-02-07T09:53:16.906-08:00That's the largest numerical error that happen...That's the largest numerical error that happened during your simulation. In the solution, RAS iterates through the equations to come up with a solution. It's an exercise of "guessing" a water surface elevation to solve the equations then comparing the resulting water surface elevation with the "guess". The maximum error represents the final value used for water surface elevation minus the "guess". Ideally these would be equal and you'd have an error of "0". But in very dynamic solutions, it can be hard for RAS to converge on a solution, thus the error. All in all, an error of 0.112 is not too bad. Chris G.https://www.blogger.com/profile/03272464763887890080noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-54619327624860534412018-02-07T09:35:17.540-08:002018-02-07T09:35:17.540-08:00The maximum xsec wsel error was 0.112
what doe...The maximum xsec wsel error was 0.112<br />what does it mean?Tacciomanhttps://www.blogger.com/profile/00669213296648530764noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-72712163403720605452018-01-24T11:24:27.235-08:002018-01-24T11:24:27.235-08:00The waterfall does not have to be a downstream bou...The waterfall does not have to be a downstream boundary. If you want to include it within your model it would be best if you included it using the inline structure feature. Especially if you are running in unsteady flow. Chris G.https://www.blogger.com/profile/03272464763887890080noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-18340432560732239052018-01-20T03:40:56.331-08:002018-01-20T03:40:56.331-08:00Good day sir,
I am quite new to modelling with HE...Good day sir,<br /><br />I am quite new to modelling with HEC-RAS. Currently I'm modelling an area in which a large waterfall is present with a drop in elevation of about 90 meters. I was wondering if it is possible to actually put the waterfall into the HEC-RAS cross sections or can it only be used as a downstream critical boundary?<br /><br />Thanks in advance!Anonymoushttps://www.blogger.com/profile/00112100173448383663noreply@blogger.comtag:blogger.com,1999:blog-1675184707067447729.post-37965441219014161102018-01-20T03:38:16.362-08:002018-01-20T03:38:16.362-08:00Good day sir,
I am quite new to modelling with HE...Good day sir,<br /><br />I am quite new to modelling with HEC-RAS. I am modelling an area in which a large waterfall is present, with a drop of 90 meters in elevation. I was wondering if it is possible to actually model the waterfall in HEC-RAS or if it can only be used as a downstream critical depth boundary.<br /><br />Thank you in advance.<br /><br />ElineAnonymoushttps://www.blogger.com/profile/00112100173448383663noreply@blogger.com