fluctuated graphs
fluctuated graphs
Dear,
Let's suppose I have 2 stocks as follows:
Carrascal Ferrer Aquifer1= INTEG (infiltration after precipitation to Carrascal Ferrer+seepage from surface water to the Carrascal Ferrer aquifer
-Carrascal Ferrer aquifer extraction -monthly spring and upwelling flow, initial Carrascal Ferrer aquifer volume)
Units: hm*hm*hm
Carrascal Ferrer Aquifer2= INTEG (infiltration after precipitation to Carrascal Ferrer+seepage from surface water to the Carrascal Ferrer aquifer
-Carrascal Ferrer aquifer extraction, initial Carrascal Ferrer aquifer volume)
Units: hm*hm*hm
The main difference between Carrascal Ferrer Aquifer1 and Carrascal Ferrer Aquifer2 is Carrascal Ferrer Aquifer2 is without a flow named
monthly spring and upwelling flow.
After simulation, I found that Carrascal Ferrer Aquifer2 is more fluctuated than that Carrascal Ferrer Aquifer1?
Can someone please explain this issue ?
Let's suppose I have 2 stocks as follows:
Carrascal Ferrer Aquifer1= INTEG (infiltration after precipitation to Carrascal Ferrer+seepage from surface water to the Carrascal Ferrer aquifer
-Carrascal Ferrer aquifer extraction -monthly spring and upwelling flow, initial Carrascal Ferrer aquifer volume)
Units: hm*hm*hm
Carrascal Ferrer Aquifer2= INTEG (infiltration after precipitation to Carrascal Ferrer+seepage from surface water to the Carrascal Ferrer aquifer
-Carrascal Ferrer aquifer extraction, initial Carrascal Ferrer aquifer volume)
Units: hm*hm*hm
The main difference between Carrascal Ferrer Aquifer1 and Carrascal Ferrer Aquifer2 is Carrascal Ferrer Aquifer2 is without a flow named
monthly spring and upwelling flow.
After simulation, I found that Carrascal Ferrer Aquifer2 is more fluctuated than that Carrascal Ferrer Aquifer1?
Can someone please explain this issue ?
Re: fluctuated graphs
The superficial answer is that the difference must be due to the additional flow. Without a working copy of the model, it's impossible for anyone to say more. Can you post the model?
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Re: fluctuated graphs
Dear,
I attach the model.
Please use fraction of spring and upwelling flow to
set monthly spring and upwelling flow
Cheers,
Bahri
I attach the model.
Please use fraction of spring and upwelling flow to
set monthly spring and upwelling flow
Cheers,
Bahri
- Attachments
-
- carrascal_ferrer_forum.mdl
- this is a vensim model
- (45.32 KiB) Downloaded 184 times
Re: fluctuated graphs
The behavior looks OK to me. There's less water in the aquifer at the end of the run with upwelling, due to the cumulative loss from that constant outflow.
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Re: fluctuated graphs
Dear,
What do you mean cumulative loss of constant flow (monthly spring and upwelling flow)?
Could you please be more specific ?
As far I understand, cumulative is only for stocks and not for flow such as monthly spring and upwelling flow.
What do you mean cumulative loss of constant flow (monthly spring and upwelling flow)?
Could you please be more specific ?
As far I understand, cumulative is only for stocks and not for flow such as monthly spring and upwelling flow.
Re: fluctuated graphs
Correct - what I mean is that the stock is lower at the end because it has accumulated the loss from the outflow.
The flow is 2/3 hm^3/month, for 72 months, and the difference is about 48 hm^3, i.e. 2/3*72.
The flow is 2/3 hm^3/month, for 72 months, and the difference is about 48 hm^3, i.e. 2/3*72.
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Re: fluctuated graphs
Thanks a lots,
How do you get 48 hm^3?
Because I got 47.3 hm^3, not 48hm^3
How do you get 48 hm^3?
Because I got 47.3 hm^3, not 48hm^3
Re: fluctuated graphs
I rounded off. But you also have only 71 months.
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Re: fluctuated graphs
Ok, thanks.
I attach a revised Vensim model.
Please open and go to Control Panel and open a graph name "historical and simulated volume of Algar aquifer".
The graph shows two lines "Carrascal Ferrer aquifer" and "historical volume of Carrascal Ferrer aquifer".
"Carrascal Ferrer aquifer" is simulated volume and "historical volume of Carrascal Ferrer aquifer" is "observed volume".
Can you please suggestion/advice how to make simulated one reproduce a similar pattern of observed one?.
Especially using "any delay functions" and any other possible functions?
Any advice will highly be appreciated.
I attach a revised Vensim model.
Please open and go to Control Panel and open a graph name "historical and simulated volume of Algar aquifer".
The graph shows two lines "Carrascal Ferrer aquifer" and "historical volume of Carrascal Ferrer aquifer".
"Carrascal Ferrer aquifer" is simulated volume and "historical volume of Carrascal Ferrer aquifer" is "observed volume".
Can you please suggestion/advice how to make simulated one reproduce a similar pattern of observed one?.
Especially using "any delay functions" and any other possible functions?
Any advice will highly be appreciated.
- Attachments
-
- carrascal_ferrer_forum_sent.mdl
- a revised Vensim model
- (44.42 KiB) Downloaded 178 times
Re: fluctuated graphs
We would need the dataset (vdf) to view.
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Re: fluctuated graphs
Hi again,
For calibration process, we can insert constants in the calibration process (optimization setup).
can we insert lookup variables in the optimization setup ?
For calibration process, we can insert constants in the calibration process (optimization setup).
can we insert lookup variables in the optimization setup ?
Re: fluctuated graphs
No, but you can use VECTOR LOOKUP on an array of constants.
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