Lamm

Hallo Users,

I am running 3D_FEFLOW 6.1 with the chose options of Standard (saturated) groundwater flow_equation and Transient flow. The Domain include 4 Aquifers and 3 Aquitats. The simulation period is 4 months. When calibrating, some parameters such as conductivity, porosity, and specific storage have been considered. However, the Model seems to be underestimated for the first period of simulation at different monitoring Wells and then simulated well at the end of simulation period (Please see an enclosed). I suppose that assigned Initial hydraulic head may be lower than the reality or Model need to be warming- up or …?

Does anyone have an idea?
Thank in advance,
Lamm

Dear Users of FEFLOW,

One boundary of the  model Domain (1st BC) is connected to Coastline. The Tidal level are measured for 1year with 1hour interval (24 times/day x 365 days = 3672 values). Regarding to the option of Time Series Editor, we have two column consisting of Time (d) and Value.  In this case, the time list of tidal data must be ranged from 1 to 3672 d. However, for one year simulation (365 days), the final simulation time in the option of Automatic time-step is entered a value of 365 days.
Question: Are there some confusion between the simulation time and the time in Time series Option? What will happen if I assign the final simulation time to 3672 days? For 1 year simulation,  which values should be used to the model?
Thanks in advances,
Lamm

Hi Users of FEFLOW,

In my 3D model, the 3rd kind BC is assigned for the River with time varying values (river water level is influenced by Tidal). Regarding to problem setting, the model is running with saturated, 3D phreatic aquifer, transient flow. Observation points closed to the river showed that the trend of observed groundwater level are similar to those of the river. This means that there are integration between river water level and groundwater level. However, the simulated results of these observation points show a single line (no fluctuation compared to observed values), although the parameters such as In-transfer rate and out-transfer rate have been adjusted). The similar results are also occurred for the observation points located near the coastline which is the 1st kind BC of the Domain.

What are the reasons for that? Do you know some other parameters (factors) need to be further changed?

Thanks in advance,
Lamm

Dear Users of FEFLOW model,
I have some questions when using FEFLOW 6.1 below.

Q1: In the model setup, the following data need to be inputted into the Domain as follows:

3rd BC for river: 1 year of Water level with 10 minute intervals (from 1.1.3012-31.12.2012).
1st BC for Tidal: 1year of Tidal level with 60 minute intervals (from 1.1.3012-31.12.2012).

Question: Whether the different interval inputs into the Domain will affect the Model results or not? In my opinion for 1 day simulation, the input of water level data of river include 6times x24h=144 values, while only 24 values of Tidal level input. How can the Model recognize these?

Q2: Groundwater level is observed with 30 minute interval. This means that measured data are obtained every 30 minute. How can I setup the time step in the Model so that I can obtain groundwater level results with the same interval as measured data?

Thanks in advance,
Lamm

Hi Florian,
I need to know the structure of the file.pow (time-series file) which includes TimeSeriesID, Time, and Values. Could you please send it to me?
Lamm

Hi Florian,

What are the 30 different time series in 20 years of groundwater recharge? You mean that 30 different timeseries correspond to 30 polygons located in your model domain? Could you explain in more detail?
Did you mention on the polygons in your Domain when inputting the data into your model?
I have reviewed all the methods offered by FEFLOW 6.1 in chapter 10.10 and supposed that these methods are still not clear to input different polygons with corresponding daily data for over a long period (e.g.  from 5 years). Perhaps, this is a limitation of Model!

Lamm

Thanks for your response.

I have reviewed different options in chapter 10.10. For the method of “Assign Time series to Material Data”: The input map contains one attribute field with all the time stages corresponding to parameter value. However, maximum column could be created in the attribute is only 255 columns. This is impossible to create the number of columns that are more than 255 (for example: 10 years x 365 days = 3650 columns).
I suppose that the method of “Time-series Joining to Maps” could be suitable for my case. However I do not know how to assign different polygons with the corresponding Time series data.  Could you please show me steps to do it?
Lamm

Hi Users,

The domain consists of 15 polygons. Groundwater recharge data will be inputted into 3D model as daily data for the period of 10 years. How can I input those data to the model? (In FEFLOW 6.1 also showed the way to input GW recharge corresponding to different polygons, but that way  seems to be simple and not able to apply for hourly or daily data of long period).
Thanks in advance,
Lamm

When using link to parameter on the point map and the corresponding boundary condition, I used the parameters “ID” of 2 measure station points in the river to link to 3rd BC. However I am not able to assign values of water level as time varying values to these points. I suppose that some steps are still missing! Could you please show me in more details?
Thanks,
Lamm

Thank Peter very much.
The Video you sent to me shows all except question 3. Could you please guild me how to deal with it?
Lamm