# GAIA / SISYPHE **URL:** https://opentelemac.org/forum/c/system-modules/gaia-sisyphe/19.md [Latest](https://opentelemac.org/forum/latest.md) · [Categories](https://opentelemac.org/forum/categories.md) · [Tags](https://opentelemac.org/forum/tags.md) --- ## [About the GAIA / SISYPHE category](https://opentelemac.org/forum/t/about-the-gaia-sisyphe-category/21)
**Author:** [@system](https://opentelemac.org/forum/u/system)\ **Replies:** 0\ **Last updated:** [October 20, 2026, 1:39pm UTC](https://opentelemac.org/forum/t/about-the-gaia-sisyphe-category/21 "2026-10-20T13:39:50Z")
Sedimentological computation --- ## [Setting up spatially varied sediment ratio and bed layer thickness](https://opentelemac.org/forum/t/setting-up-spatially-varied-sediment-ratio-and-bed-layer-thickness/8168)
**Author:** [@user\_17764](https://opentelemac.org/forum/u/user_17764)\ **Replies:** 0\ **Last updated:** [October 17, 2026, 8:28pm UTC](https://opentelemac.org/forum/t/setting-up-spatially-varied-sediment-ratio-and-bed-layer-thickness/8168 "2026-10-17T20:28:14Z")
Hello \[name removed\], I’m having an issue setting up a case with spatially varied sediment ratio and bed layer thickness (v8p3r0). There are 4 classes of sediment and 3 layers (excluding the active layer) and the value… --- ## [Bed Load Sortie File does not match Blue Kenue results](https://opentelemac.org/forum/t/bed-load-sortie-file-does-not-match-blue-kenue-results/8144)
**Author:** [@user\_17013](https://opentelemac.org/forum/u/user_17013)\ **Replies:** 4\ **Last updated:** [June 15, 2026, 7:53am UTC](https://opentelemac.org/forum/t/bed-load-sortie-file-does-not-match-blue-kenue-results/8144 "2026-06-15T07:53:26Z")
Dear \[name removed\], I’m currently experimenting with a bed-load time series in GAIA (v8p4) and trying to match the boundary mass balance from the listing file (attached) with what I get when I post-process the SELAFIN … --- ## [Bed roughness prediction in GAIA](https://opentelemac.org/forum/t/bed-roughness-prediction-in-gaia/8143)
**Author:** [@user\_434](https://opentelemac.org/forum/u/user_434)\ **Replies:** 2\ **Last updated:** [June 5, 2026, 10:36am UTC](https://opentelemac.org/forum/t/bed-roughness-prediction-in-gaia/8143 "2026-06-05T10:36:52Z")
Hello, I would be interested to know if anyone has implemented successfully in GAIA the predictive bed roughness approach (in ride\_vr.f), based on \[name removed\] empirical scheme, which worked correctly in Sisyphe, feed… --- ## [Yen\_case: how to generate ini\_yen-exp.slf ?](https://opentelemac.org/forum/t/yen-case-how-to-generate-ini-yen-exp-slf/8142)
**Author:** [@user\_17311](https://opentelemac.org/forum/u/user_17311)\ **Replies:** 1\ **Last updated:** [May 27, 2026, 7:36am UTC](https://opentelemac.org/forum/t/yen-case-how-to-generate-ini-yen-exp-slf/8142 "2026-05-27T07:36:32Z")
Hi \[name removed\], Could you share, or briefly describe, the boundary conditions and parameters used to generate ini\_yen-exp.slf? In particular: which Q and H values were prescribed on the two boundaries? was a hydrogr… --- ## [TELEMAC3D-TOMAWAC-GAIA Coupling Initial Tracer Problem](https://opentelemac.org/forum/t/telemac3d-tomawac-gaia-coupling-initial-tracer-problem/8120)
**Author:** [@user\_18330](https://opentelemac.org/forum/u/user_18330)\ **Replies:** 8\ **Last updated:** [May 9, 2026, 11:03am UTC](https://opentelemac.org/forum/t/telemac3d-tomawac-gaia-coupling-initial-tracer-problem/8120 "2026-05-09T11:03:29Z")
Dear \[name removed\], I am working with the TELEMAC-3D + TOMAWAC + GAIA coupling model (v8p4r0, \[name removed\] setup). My study area includes two water masses with salinity values of 0 ppt and 17.5 ppt. Initially, I ra… --- ## [GAIA Private Variable / Rouse Number](https://opentelemac.org/forum/t/gaia-private-variable-rouse-number/8034)
**Author:** [@user\_10598](https://opentelemac.org/forum/u/user_10598)\ **Replies:** 3\ **Last updated:** [April 27, 2026, 12:25pm UTC](https://opentelemac.org/forum/t/gaia-private-variable-rouse-number/8034 "2026-04-27T12:25:28Z")
Hello, I’m using GAIA coupled with \[name removed\] (version 9.0) and would like to see the Rouse Number (Ws/kappa/u\*) in Gaia’s result file (.slf). Item “6.4 Print a new output variable in the selafin file” of Gaia’s U… --- ## [Regarding the use of morphological factors for 2D river modeling](https://opentelemac.org/forum/t/regarding-the-use-of-morphological-factors-for-2d-river-modeling/8101)
**Author:** [@user\_17591](https://opentelemac.org/forum/u/user_17591)\ **Replies:** 1\ **Last updated:** [April 26, 2026, 12:25pm UTC](https://opentelemac.org/forum/t/regarding-the-use-of-morphological-factors-for-2d-river-modeling/8101 "2026-04-26T12:25:35Z")
Hi, I am confused about the two morphological factors given in the manual: MORPHOLOGICAL FACTOR ON BED EVOLUTION and MORPHOLOGICAL FACTOR ON TIME SCALE. Which of these factors should I use if I want to speed up and sim… --- ## [Bed Load Transport Output with MORFAC](https://opentelemac.org/forum/t/bed-load-transport-output-with-morfac/8116)
**Author:** [@user\_16941](https://opentelemac.org/forum/u/user_16941)\ **Replies:** 2\ **Last updated:** [February 27, 2026, 3:45pm UTC](https://opentelemac.org/forum/t/bed-load-transport-output-with-morfac/8116 "2026-02-27T15:45:29Z")
Hi, Im doing morphological simulations in GAIA (v8p5 still, but could check whether v9 exhibits the same) and found that the computed bed load transport in the results file differs depending on the chosen variable. The… --- ## [spatial distribution of mean diameter in GAIA](https://opentelemac.org/forum/t/spatial-distribution-of-mean-diameter-in-gaia/8099)
**Author:** [@user\_16725](https://opentelemac.org/forum/u/user_16725)\ **Replies:** 0\ **Last updated:** [December 29, 2025, 1:27pm UTC](https://opentelemac.org/forum/t/spatial-distribution-of-mean-diameter-in-gaia/8099 "2025-12-29T13:27:57Z")
Hi \[name removed\], I have tried to spatially distribute the mean sediment diameter over my computational domain using the user\_bed\_init.f subroutine in GAIA. In my GAIA CAS file, I defined the sediment classes as follo… --- ## [GAIA](https://opentelemac.org/forum/t/gaia/8098)
**Author:** [@user\_8492](https://opentelemac.org/forum/u/user_8492)\ **Replies:** 0\ **Last updated:** [December 25, 2025, 10:53am UTC](https://opentelemac.org/forum/t/gaia/8098 "2025-12-25T10:53:49Z")
I need to simulate seabed erosion in a port, caused by ships maneuvering propellers. I can’t get any significant results. Please give me advice T3D-gaia-ROTTA1\_15navi----360gg-Copia.rar (363 KB) --- ## [Issue with the reading of the BEDLOAD BOUNDARIES FILE](https://opentelemac.org/forum/t/issue-with-the-reading-of-the-bedload-boundaries-file/8022)
**Author:** [@user\_18065](https://opentelemac.org/forum/u/user_18065)\ **Replies:** 7\ **Last updated:** [December 10, 2025, 2:51am UTC](https://opentelemac.org/forum/t/issue-with-the-reading-of-the-bedload-boundaries-file/8022 "2025-12-10T02:51:23Z")
Hello. I try to ask the following question for another user. this is due to some difficulties recently to interact with the website. Apparently a cybersecuriy software watches the website and blocks certain contents. I… --- ## [Boundary Conditions Bedload in GAIA](https://opentelemac.org/forum/t/boundary-conditions-bedload-in-gaia/8084)
**Author:** [@user\_16725](https://opentelemac.org/forum/u/user_16725)\ **Replies:** 2\ **Last updated:** [December 6, 2025, 4:17pm UTC](https://opentelemac.org/forum/t/boundary-conditions-bedload-in-gaia/8084 "2025-12-06T16:17:50Z")
Hi, I’m running a 2D river simulation in TELEMAC-2D coupled with GAIA for bedload transport. The model has a single inlet boundary and two outlets. Following the GAIA manual, I tested the inlet boundary condition usin… --- ## [Parallel issue - Bed\_init subroutine](https://opentelemac.org/forum/t/parallel-issue-bed-init-subroutine/8074)
**Author:** [@user\_16576](https://opentelemac.org/forum/u/user_16576)\ **Replies:** 1\ **Last updated:** [October 24, 2025, 10:19am UTC](https://opentelemac.org/forum/t/parallel-issue-bed-init-subroutine/8074 "2025-10-24T10:19:02Z")
Hello, I’m trying to set up a spatialized sediment distribution in GAIA using the bed\_init.f file and the INPOLY function to define the distribution by area. Everything works fine in sequential mode, but when I switch … --- ## [Implementation of Van Rijn's formula (1993 or 2007) in GAIA](https://opentelemac.org/forum/t/implementation-of-van-rijns-formula-1993-or-2007-in-gaia/8059)
**Author:** [@user\_16858](https://opentelemac.org/forum/u/user_16858)\ **Replies:** 0\ **Last updated:** [September 23, 2025, 3:20pm UTC](https://opentelemac.org/forum/t/implementation-of-van-rijns-formula-1993-or-2007-in-gaia/8059 "2025-09-23T15:20:02Z")
Hi \[name removed\], I’m currently trying to implement the \[name removed\] formulas (1993 or 2007) for bedload and suspended load for a coastal modeling project. Has anyone here worked with these formulas and might have a… --- ## [Suggestion for Feature - Moving Sediment Sources](https://opentelemac.org/forum/t/suggestion-for-feature-moving-sediment-sources/8056)
**Author:** [@user\_8673](https://opentelemac.org/forum/u/user_8673)\ **Replies:** 0\ **Last updated:** [September 22, 2025, 12:02pm UTC](https://opentelemac.org/forum/t/suggestion-for-feature-moving-sediment-sources/8056 "2025-09-22T12:02:23Z")
Hi TELEMAC users, We are very commonly using TELEMAC/GAIA for far-field dredge plume modelling studies. One of the main limitations in the current versions is that sediment sources remain stationary over the duration of… --- ## [Accumulation at inlet with no sediment influx](https://opentelemac.org/forum/t/accumulation-at-inlet-with-no-sediment-influx/7127)
**Author:** [@user\_15766](https://opentelemac.org/forum/u/user_15766)\ **Replies:** 13\ **Last updated:** [August 19, 2025, 8:33pm UTC](https://opentelemac.org/forum/t/accumulation-at-inlet-with-no-sediment-influx/7127 "2025-08-19T20:33:45Z")
Hi \[name removed\], I have run into a perplexing issue that runs counter to what I would’ve expected. In essence, I’m trying to determine the armoured GSD from a known, pre-armoured GSD and so I’m running the model witho… --- ## [GAIA - Schmidt number and sediment diffusion](https://opentelemac.org/forum/t/gaia-schmidt-number-and-sediment-diffusion/8039)
**Author:** [@user\_10598](https://opentelemac.org/forum/u/user_10598)\ **Replies:** 3\ **Last updated:** [August 18, 2025, 7:27am UTC](https://opentelemac.org/forum/t/gaia-schmidt-number-and-sediment-diffusion/8039 "2025-08-18T07:27:27Z")
Hello, In Gaia V9.0 manual, one can read the following lines, refering to the advection-diffusion equation: ========================== \*(…) εs is the turbulent diffusivity of the sediment, often related to the eddy … --- ## [drege dumping](https://opentelemac.org/forum/t/drege-dumping/8030)
**Author:** [@user\_15804](https://opentelemac.org/forum/u/user_15804)\ **Replies:** 2\ **Last updated:** [August 1, 2025, 1:31pm UTC](https://opentelemac.org/forum/t/drege-dumping/8030 "2025-08-01T13:31:35Z")
Hi, I want to simulate a dredger dumping event with t3d+gaia. I figured I would do a “far field” model of only the final settling process, so I should place a source at the top of my domain, with some (low) vertical vel… --- ## [How to set bed load gradation by zones](https://opentelemac.org/forum/t/how-to-set-bed-load-gradation-by-zones/8028)
**Author:** [@user\_17460](https://opentelemac.org/forum/u/user_17460)\ **Replies:** 1\ **Last updated:** [July 24, 2025, 2:22pm UTC](https://opentelemac.org/forum/t/how-to-set-bed-load-gradation-by-zones/8028 "2025-07-24T14:22:21Z")
The first question is whether it is possible to set the bed load grading in different regions of the simulation area, and how to achieve it? The second question is, my suspended solids concentration changes over time. H… --- ## [Fluxline method for cohesive sediments](https://opentelemac.org/forum/t/fluxline-method-for-cohesive-sediments/8021)
**Author:** [@user\_16914](https://opentelemac.org/forum/u/user_16914)\ **Replies:** 2\ **Last updated:** [July 9, 2025, 1:26pm UTC](https://opentelemac.org/forum/t/fluxline-method-for-cohesive-sediments/8021 "2025-07-09T13:26:59Z")
Hey everyone, I am having a bit confusion about the fluxline method. I use two sediment classes in my model (1 NCOH + 1 COH), but the fluxline method only prints the fluxes for MYCLASS 1 which is my NCOH class index. I … --- ## [Prescribing both Suspended sediments and solid discharge at inlet?](https://opentelemac.org/forum/t/prescribing-both-suspended-sediments-and-solid-discharge-at-inlet/8003)
**Author:** [@user\_17591](https://opentelemac.org/forum/u/user_17591)\ **Replies:** 1\ **Last updated:** [July 9, 2025, 1:01pm UTC](https://opentelemac.org/forum/t/prescribing-both-suspended-sediments-and-solid-discharge-at-inlet/8003 "2025-07-09T13:01:24Z")
Hi, I have two classes of sediments, one cohesive and another non-cohesive. I must prescribe the cohesive sediments as suspended sediment at the inlet boundary and non-cohesive sediments as bed load or solid discharge. … --- ## [Set a non-erodible bottom](https://opentelemac.org/forum/t/set-a-non-erodible-bottom/7880)
**Author:** [@user\_17006](https://opentelemac.org/forum/u/user_17006)\ **Replies:** 3\ **Last updated:** [June 25, 2025, 2:41pm UTC](https://opentelemac.org/forum/t/set-a-non-erodible-bottom/7880 "2025-06-25T14:41:54Z")
Dear \[name removed\], the form bag concrete is used for slope protection below â–½ 10.0, and the square lattice skeleton is used for slope protection above â–½ 10.0. As shown in the figure, how to set the local non-erodib… --- ## [Mixed Sediment Simulation Keywords](https://opentelemac.org/forum/t/mixed-sediment-simulation-keywords/8004)
**Author:** [@user\_17591](https://opentelemac.org/forum/u/user_17591)\ **Replies:** 0\ **Last updated:** [May 9, 2025, 12:57pm UTC](https://opentelemac.org/forum/t/mixed-sediment-simulation-keywords/8004 "2025-05-09T12:57:18Z")
I’m setting up a sediment transport simulation with two sediment classes: one non-cohesive (NCO) and one cohesive (CO). I’m unsure if the keywords are correctly configured for a simulation with two sediment classes, … --- ## [ISSUE IN PRESCRIBING BOTH BEDLOAD SUSPENDED SEDIMENTS](https://opentelemac.org/forum/t/issue-in-prescribing-both-bedload-suspended-sediments/7994)
**Author:** [@user\_17591](https://opentelemac.org/forum/u/user_17591)\ **Replies:** 0\ **Last updated:** [April 24, 2025, 7:21am UTC](https://opentelemac.org/forum/t/issue-in-prescribing-both-bedload-suspended-sediments/7994 "2025-04-24T07:21:58Z")
To impose the Suspended Sediment concentration at the inflow boundary, the flag LICBOR\\LIEBOR is set = 5. Then, we can specify the concentration values at the boundary through the keyword PRESCRIBED SUSPENDED SEDIMENTS C… --- ## [T3D - GAIA Coupling error](https://opentelemac.org/forum/t/t3d-gaia-coupling-error/7988)
**Author:** [@user\_18554](https://opentelemac.org/forum/u/user_18554)\ **Replies:** 1\ **Last updated:** [April 14, 2025, 10:32am UTC](https://opentelemac.org/forum/t/t3d-gaia-coupling-error/7988 "2025-04-14T10:32:30Z")
Hello \[name removed\], i have set up a case of TELEMAC-3D and GAIA. The hydrodynamic part does work fine as long as not coupled to GAIA. Once coupled the simulation crashes with following error message: Program received… --- ## [spatial distribution of sediment classes](https://opentelemac.org/forum/t/spatial-distribution-of-sediment-classes/6898)
**Author:** [@user\_15624](https://opentelemac.org/forum/u/user_15624)\ **Replies:** 10\ **Last updated:** [March 20, 2025, 6:46am UTC](https://opentelemac.org/forum/t/spatial-distribution-of-sediment-classes/6898 "2025-03-20T06:46:22Z")
hi \[name removed\], Is it possible to do a spatial distribution of sediment classes. I mean setting a specific class in a certain area and an other class in an other area. thx and bests \[name removed\] --- ## [Error When Running Coupled TELEMAC-MASCARET Model with Different Meshe](https://opentelemac.org/forum/t/error-when-running-coupled-telemac-mascaret-model-with-different-meshe/7920)
**Author:** [@user\_18645](https://opentelemac.org/forum/u/user_18645)\ **Replies:** 1\ **Last updated:** [March 2, 2025, 8:03pm UTC](https://opentelemac.org/forum/t/error-when-running-coupled-telemac-mascaret-model-with-different-meshe/7920 "2025-03-02T20:03:52Z")
Hi \[name removed\], I hope you’re doing well. I’m currently working with the TELEMAC-MASCARET system and testing its capability to run a coupled model using different meshes. To verify this, I decided to use one of the… --- ## [Error When Running Coupled TELEMAC-MASCARET Model with Different Mesh](https://opentelemac.org/forum/t/error-when-running-coupled-telemac-mascaret-model-with-different-mesh/7922)
**Author:** [@user\_18645](https://opentelemac.org/forum/u/user_18645)\ **Replies:** 1\ **Last updated:** [March 2, 2025, 1:00pm UTC](https://opentelemac.org/forum/t/error-when-running-coupled-telemac-mascaret-model-with-different-mesh/7922 "2025-03-02T13:00:18Z")
Hi \[name removed\], I hope you’re doing well. I’m currently working with the TELEMAC-MASCARET system and testing its capability to run a coupled model using different meshes. To verify this, I decided to use one of the… --- ## [CRITICAL EROSION SHEAR STRESS Varying in Space](https://opentelemac.org/forum/t/critical-erosion-shear-stress-varying-in-space/7930)
**Author:** [@user\_13793](https://opentelemac.org/forum/u/user_13793)\ **Replies:** 0\ **Last updated:** [February 11, 2025, 7:32am UTC](https://opentelemac.org/forum/t/critical-erosion-shear-stress-varying-in-space/7930 "2025-02-11T07:32:44Z")
Hi \[name removed\], How do I specify CRITICAL EROSION SHEAR STRESS varying in space in the program when calculating a large-scale sediment model.I think this is useful when calculating large-scale sediment models. Than… [Next page](https://opentelemac.org/forum/c/system-modules/gaia-sisyphe/19.md?page=1)