# Regarding the use of morphological factors for 2D river modeling

**URL:** <https://opentelemac.org/forum/t/regarding-the-use-of-morphological-factors-for-2d-river-modeling/8101>\
**Category:** GAIA / SISYPHE\
**Created:** [January 9, 2026, 12:19pm UTC](https://opentelemac.org/forum/t/regarding-the-use-of-morphological-factors-for-2d-river-modeling/8101 "2026-01-09T12:19:42Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![user\_17591](https://opentelemac.org/forum/letter_avatar_proxy/v4/letter/u/258eb7/32.png) [@user\_17591](https://opentelemac.org/forum/u/user_17591)\
**Post date:** [January 9, 2026, 12:19pm UTC](https://opentelemac.org/forum/t/regarding-the-use-of-morphological-factors-for-2d-river-modeling/8101/1 "2026-01-09T12:19:42Z")

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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 simulate 25 years of river morphology with a 1-year hydrograph cycle?

I have both bed load and suspended sediment in the model.

Thank you.

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**Author:** ![user\_438](https://opentelemac.org/forum/letter_avatar_proxy/v4/letter/u/c77e96/32.png) [@user\_438](https://opentelemac.org/forum/u/user_438)\
**Post date:** [April 26, 2026, 12:25pm UTC](https://opentelemac.org/forum/t/regarding-the-use-of-morphological-factors-for-2d-river-modeling/8101/2 "2026-04-26T12:25:35Z")

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Hello,

If you used the latest release (currently 9.1.0), you would not be any confused as there is now only 1 morphological factor keyword.

Do not forget to read the GAIA user manual.

[name removed]