# Setting up spatially varied sediment ratio and bed layer thickness

**URL:** <https://opentelemac.org/forum/t/setting-up-spatially-varied-sediment-ratio-and-bed-layer-thickness/8168>\
**Category:** GAIA / SISYPHE\
**Created:** [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")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![user\_17764](https://opentelemac.org/forum/letter_avatar_proxy/v4/letter/u/e9c0ed/32.png) [@user\_17764](https://opentelemac.org/forum/u/user_17764)\
**Post date:** [October 17, 2026, 8:28pm UTC](https://opentelemac.org/forum/t/setting-up-spatially-varied-sediment-ratio-and-bed-layer-thickness/8168/1 "2026-10-17T20:28:14Z")

</div>

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 values are different at evey node. I tried setting it up using Matlab by providing the info (ratio of each class and thickness of each bed layer including the active layer) at every node in a slf file based on a stratigraphy data. And then I put this as a continuation file in Gaia, expecting that it’d read in this file and carry the setup.

However, I found that the first time step of the result file (rGaia\_test.slf) is not the same as the continuation file I set up (rGaia\_setup\_strata.slf)—some values are the same but some are off! I enclosed every file I use here. [name removed] and gaia\_test\_strata.cas are the cas files I used to test the setup.

I know that I can set it up using ‘user\_bed\_init.f,’ but I don’t know of any good way to use it for my case, as each node has a different value of sed. ratio and bed thickness.

I’d really really appreciate any input… Thank you in advance!

[name removed]

\*The slf files are too large to attach..

[gaia\_test\_strata.cas](https://opentelemac.org/forum/uploads/short-url/veEAGW7SRwj53IkBiKKiYyxhY9m.cas) (3.44 KB)  
[t2d-gaia\_test\_strata.cas](https://opentelemac.org/forum/uploads/short-url/t7YLsDhyJvXnOfA04gvrackw5PK.cas) (3.71 KB)