Saltwater !!

Hello,

I am looking for the method to input saltwater in my coastal model (density ratio, hydraulic head (saltwater) BC,...).

Is there someone able to explain me?

Regards,

Terry

Just a very short summary here: The density ratio is (rhos-rho0)/rho0 where rhos is the density of saltwater at concentration cs, rho0 is density at reference concentration c0. cs and c0 are input in Problem Settings - Transport Settings. Assuming that the seawater concentration is constant and equal to cs over depth at your sea boundary, the equivalent freshwater head BC value is (ztop-z)*density ratio. FEFLOW does this calculation automatically if you use the 'Saltwater Head' input option for the Hydraulic-head BC.

Thank you Peter,

I'm agree with you, and i know already this method, but obviously concentration are different from those observed on field. Indeed there is too much salt. Which parameters do you suggest me to change.

Parameters i  don't want to change:    density ratio: 0.02543
                                                            hydraulic head (saltwater) BC = 0
                                                            hydraulic head BC = (ztop-z)*density ratio
                                                            mass concentration BC = 36000 mg/l
                                           
             
Parameters i would change:                molécular diffusion
                                                            Longitudinal et transversal dispersivity  (I know that  a[sub]l[/sub]/a[sub]t[/sub]=10, but how to chosse a[sub]l[/sub] or a[sub]t[/sub] ?)
                                                            K et S
                                                            porosity

Is there any parameters i forgot or another way to calibrate mass concentration ?

Regards,
Terry

where can we see seawater head boundary condition option?

In the Data panel, please right-click on Fluid flow just below Boundary Conditions (BC) and choose Add Parameter from the context menu. Finally, choose Hydraulic-head BC (Saltwater).

thanks a lot. what bot density ratio? how can i incorporate it in to 3D model?

I am sorry. I think I did not fully understand your question. You may find a description of the density ratio here: http://www.feflow.info/html/help71/feflow/mainpage.htm#t=09_Parameters%2FMaterial_Properties%2Fflow_parameters.html%3Frhhlterm%3Ddensity%2520ratio%26rhsyns%3D%2520. If this does not answer your question, please provide more details.

Where can i find detailed steps to do seawater intrusion model. Is there any tutorial for that? If i have a 3d flow model in a coastal regions wat and all parameters should i add to find sea water intrusion . How its calibration is done etc

Dear razipv,

I would like to ask you to refrain from using capitalization in the way you do. This is generally considered as very rude, as it stands for yelling. You're asking for help, and I don't think you'll receive it when shouting at fellow forum members.

Thanks
Peter

Thanks Peter. I fully agree.

Dear razipv,

Unfortunately, I cannot provide a detailed step-by-step manual. Instead, I can provide an answer to your specific question. If you are interested in a detailed step-by-step manual, I suggest a training course.

We will start our online training course sessions soon. For me it seems that [b]Module E: Introduction to density-driven flow for mining applications[/b] could address your interest. You may find further information on the training flyer:

https://www.dhigroup.com/upload/publications/course-calendar/DE_2018_CourseDescription_Thematic_FEFLOW_OnlineCourses_UK_B.pdf?_ga=2.31410687.1120057999.1534764576-697283644.1523874356

Thanks,
Björn

im sorry,  because capslock was on and noticed it only after typing a little bit. actually it was not in a rude way. i was just lazy to type it again. once again im so sorry :-\

i want to understand saltwater intrusion by sealevel rise. for that i need to put seawater head boundary as transient ryt. but there is no option to add time series for seawater boundary in editor. wat should i do?

Thank you for further clarification. I understand the problem now. Yes, you are right, FEFLOW does not have the option to assign a time-series to a SaltwaterBC. This is a missing feature. I will add this missing feature on the wish list for possible future developments. In the meanwhile, I suggest to assign the time-series to the equivalent fresh-water head (Hydraulic-head BC). Of course, you need to recalculate the time-series before you assign. Thank you for the note on the missing feature.

u r welcome  :)
is there any formula to calculate equivalent fresh water head?
for example my initial sea level is 0m, then it increase at the rate of 3mm per year. so i can put it directly as time series ryt?

http://www.feflow.info/html/help71/feflow/mainpage.htm#t=09_Parameters%2FBoundary_Conditions%2FFlow%2Fhydraulic_head_bc_saltwaterhead.html

Thank you :)

Hi, I am intrigued. Variable BC for Salt water Head - Plugin is facilitating the use of timeseries to give saltwater boundary if my understanding is correct. Please let me know if my understanding is wrong.