# WAVE HEIGHT RESULTS DECREASING TO 0

**URL:** <https://opentelemac.org/forum/t/wave-height-results-decreasing-to-0/6917>\
**Category:** TOMAWAC\
**Created:** [July 13, 2022, 10:46am UTC](https://opentelemac.org/forum/t/wave-height-results-decreasing-to-0/6917 "2022-07-13T10:46:37Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![user\_15624](https://opentelemac.org/forum/letter_avatar_proxy/v4/letter/u/5fc32e/32.png) [@user\_15624](https://opentelemac.org/forum/u/user_15624)\
**Post date:** [July 13, 2022, 10:46am UTC](https://opentelemac.org/forum/t/wave-height-results-decreasing-to-0/6917/1 "2022-07-13T10:46:37Z")

</div>

hi [name removed] body,

when I run my tomawac simulation, results such as wave height , mean direction …

[RTOM\_72H\_sant6.slf](https://opentelemac.org/forum/uploads/short-url/tpzVq0Xac9sxPHWtoO6oneeM8VL.slf) (1.92 MB)

tend to decrease from top to lowest values (0 or close to).

when I add transfer terms (triads and quadruplets) same things even if it tends to stabilize around low values at the end of the simulation

[RTM\_72H\_triquadt2.slf](https://opentelemac.org/forum/uploads/short-url/fNrM3l3sM7Q9drUSJ6sbeSds4Zp.slf) (1.92 MB)

, too low to represent the reality (real value of wave height around 1.5m).

you can find my steering, geometry and boundary condition files attached.

thanks for your help

[name removed]

[CAS\_PASP\_TOM.cas](https://opentelemac.org/forum/uploads/short-url/2r7mh5cfjeUSezrRUDCZBpX4X2f.cas) (7.18 KB)  
[CONDLIM\_PASP\_WAVE\_MER1115\_FLV4555.cli](https://opentelemac.org/forum/uploads/short-url/w1sWeuCTz8SHfu3PsYcneqoMnrr.cli) (12.8 KB)  
[GEO\_PASP\_SLF\_ALL200RADE100\_2022-07-13.slf](https://opentelemac.org/forum/uploads/short-url/72s2rFpFHMFGk7pLGHKrojwnozW.slf) (15.2 KB)

---

<div class="post-metadata">

**Author:** ![user\_8473](https://opentelemac.org/forum/letter_avatar_proxy/v4/letter/u/8c91f0/32.png) [@user\_8473](https://opentelemac.org/forum/u/user_8473)\
**Post date:** [July 18, 2022, 1:04pm UTC](https://opentelemac.org/forum/t/wave-height-results-decreasing-to-0/6917/2 "2022-07-18T13:04:08Z")

</div>

Hello

in your cli file for the points you comment as wave input you put 1 1 1 as your boundary condition which means absorbing boundary (all boundary that does not start by a 5 is considered as absorbing). Be careful boundary condition in Tomawac are not the same as telemac.

if it is 5 ? ? it is an imposed wave height ( ? can be anything it is not taken into account)

Starting by anything else it is absorbing.

In the next version (or in the trunk) you can start with 8 which will mean reflexion.

That is why you energy is decreasing.

Hope i am clear

---

<div class="post-metadata">

**Author:** ![user\_15624](https://opentelemac.org/forum/letter_avatar_proxy/v4/letter/u/5fc32e/32.png) [@user\_15624](https://opentelemac.org/forum/u/user_15624)\
**Post date:** [July 26, 2022, 9:38am UTC](https://opentelemac.org/forum/t/wave-height-results-decreasing-to-0/6917/3 "2022-07-26T09:38:16Z")

</div>

Hi [name removed],

Your advice has been great (no decrease), even if the values are like “stationary”, I think it’s because I use a constant wind. Also I have to better use “the type of initial/boundary directional spectrum”.

To Sum all of that, Thanks.

[name removed]

---

<div class="post-metadata">

**Author:** ![user\_15624](https://opentelemac.org/forum/letter_avatar_proxy/v4/letter/u/5fc32e/32.png) [@user\_15624](https://opentelemac.org/forum/u/user_15624)\
**Post date:** [August 11, 2022, 4:57am UTC](https://opentelemac.org/forum/t/wave-height-results-decreasing-to-0/6917/4 "2022-08-11T04:57:20Z")

</div>

Hi [name removed],

I know you are pretty busy developping the software (thx for that) but could it be possible to have the wave direction in arrows ( arrow /+ surfaces) also, rather than in surface only. It’d be great.

[name removed]