Question about Boundary conditions in groundwater model

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• Hi there I will model a closed basin area, which does not interact with any surface water bodies or groundwater from out of the basin. Obviously, the outer
Message 1 of 9 , Jan 10, 2008
Hi there

I will model a closed basin area, which does not interact with any
surface water bodies or groundwater from out of the basin. Obviously,
the outer boundary is no flow boundary. However, in reality the head
might be changing with time. So how to assign the boundary conditions?
I appreciate any help.
• Dr.Haron, The problem may be treated Dirichlet problem where solution is to find head(potential) in the interior of the problem domain. regards BVN Sharma
Message 2 of 9 , Jan 10, 2008
Dr.Haron,

The problem may be treated Dirichlet problem where solution is to find head(potential) in the interior of the problem domain.

regards
BVN Sharma

dr_haron <dr_haron@...> wrote:
Hi there

I will model a closed basin area, which does not interact with any
surface water bodies or groundwater from out of the basin. Obviously,
the outer boundary is no flow boundary. However, in reality the head
might be changing with time. So how to assign the boundary conditions?
I appreciate any help.
• Thanks Sharma But what values of initial head should I give for steady state simulation?? ... to find head(potential) in the interior of the problem domain.
Message 3 of 9 , Jan 10, 2008
Thanks Sharma

But what values of initial head should I give for steady state
simulation??

--- In hydforum@yahoogroups.com, Bulusu Venkata Narasimha Sharma
<bvn_sharma@...> wrote:
>
> Dr.Haron,
>
> The problem may be treated Dirichlet problem where solution is
to find head(potential) in the interior of the problem domain.
>
> regards
> BVN Sharma
>
>
> dr_haron <dr_haron@...> wrote:
> Hi there
>
> I will model a closed basin area, which does not interact with any
> surface water bodies or groundwater from out of the basin.
Obviously,
> the outer boundary is no flow boundary. However, in reality the
> might be changing with time. So how to assign the boundary
conditions?
> I appreciate any help.
>
• Dr.Haron, You must know some values of potential at the boundary nodes to simulate, which could be obtained from measuring water levels in observation wells.
Message 4 of 9 , Jan 10, 2008
Dr.Haron,

You must know some values of potential at the boundary nodes to simulate, which could be obtained from measuring water levels in observation wells. How many obserbation wells a basin have, sufficency of collected data depends on what.

thank you
Dr.Haron

dr_haron <dr_haron@...> wrote: Thanks Sharma

But what values of initial head should I give for steady state
simulation??

--- In hydforum@yahoogroups.com, Bulusu Venkata Narasimha Sharma
<bvn_sharma@...> wrote:
>
> Dr.Haron,
>
> The problem may be treated Dirichlet problem where solution is
to find head(potential) in the interior of the problem domain.
>
> regards
> BVN Sharma
>
>
> dr_haron <dr_haron@...> wrote:
> Hi there
>
> I will model a closed basin area, which does not interact with any
> surface water bodies or groundwater from out of the basin.
Obviously,
> the outer boundary is no flow boundary. However, in reality the
> might be changing with time. So how to assign the boundary
conditions?
> I appreciate any help.
>
• Dr.Haron, are you following boundary element numerical analysis? thank you sharma Bulusu Venkata Narasimha Sharma wrote: Dr.Haron, You
Message 5 of 9 , Jan 13, 2008
Dr.Haron,

are you following boundary element numerical analysis?

thank you
sharma

Bulusu Venkata Narasimha Sharma <bvn_sharma@...> wrote:
Dr.Haron,

You must know some values of potential at the boundary nodes to simulate, which could be obtained from measuring water levels in observation wells. How many obserbation wells a basin have, sufficency of collected data depends on what.

thank you
Dr.Haron

dr_haron <dr_haron@...> wrote: Thanks Sharma

But what values of initial head should I give for steady state
simulation??

--- In hydforum@yahoogroups.com, Bulusu Venkata Narasimha Sharma
<bvn_sharma@...> wrote:
>
> Dr.Haron,
>
> The problem may be treated Dirichlet problem where solution is
to find head(potential) in the interior of the problem domain.
>
> regards
> BVN Sharma
>
>
> dr_haron <dr_haron@...> wrote:
> Hi there
>
> I will model a closed basin area, which does not interact with any
> surface water bodies or groundwater from out of the basin.
Obviously,
> the outer boundary is no flow boundary. However, in reality the
> might be changing with time. So how to assign the boundary
conditions?
> I appreciate any help.
• No, I am using finite difference method. But I believe using monitoring data is not valid in this case. I need some reference to be used as initial head for
Message 6 of 9 , Jan 16, 2008
No, I am using finite difference method. But I believe using
monitoring data is not valid in this case. I need some "reference"
there will be more than one solution.

--- In hydforum@yahoogroups.com, Bulusu Venkata Narasimha Sharma
<bvn_sharma@...> wrote:
>
> Dr.Haron,
>
> are you following boundary element numerical analysis?
>
> thank you
> sharma
>
>
> Bulusu Venkata Narasimha Sharma <bvn_sharma@...> wrote:
> Dr.Haron,
>
> You must know some values of potential at the boundary nodes to
simulate, which could be obtained from measuring water levels in
observation wells. How many obserbation wells a basin have,
sufficency of collected data depends on what.
>
> thank you
> Dr.Haron
>
> dr_haron <dr_haron@...> wrote: Thanks Sharma
>
> But what values of initial head should I give for steady state
> simulation??
>
> --- In hydforum@yahoogroups.com, Bulusu Venkata Narasimha Sharma
> <bvn_sharma@> wrote:
> >
> > Dr.Haron,
> >
> > The problem may be treated Dirichlet problem where solution is
> to find head(potential) in the interior of the problem domain.
> >
> > regards
> > BVN Sharma
> >
> >
> > dr_haron <dr_haron@> wrote:
> > Hi there
> >
> > I will model a closed basin area, which does not interact with
any
> > surface water bodies or groundwater from out of the basin.
> Obviously,
> > the outer boundary is no flow boundary. However, in reality the
> > might be changing with time. So how to assign the boundary
> conditions?
> > I appreciate any help.
>
• Dr.Haron, This is a case of potential problems. you may use finite differences, finite elements, boundary elements. in first the two are domain discretization
Message 7 of 9 , Jan 18, 2008
Dr.Haron,

This is a case of potential problems. you may use finite differences, finite elements, boundary elements. in first the two are domain discretization is followed and the solution domain and problem domain are same. in the other method the solution domain and the problem domain are different.

I remeber an author HUNT priduced a book MATHEMATICAL MODELING OF GROUNDWATER FLOW published by BUTTERWORTHS.

bvn SHARMA

dr_haron <dr_haron@...> wrote:

No, I am using finite difference method. But I believe using
monitoring data is not valid in this case. I need some "reference"
there will be more than one solution.

--- In hydforum@yahoogroups.com, Bulusu Venkata Narasimha Sharma
<bvn_sharma@...> wrote:
>
> Dr.Haron,
>
> are you following boundary element numerical analysis?
>
> thank you
> sharma
>
>
> Bulusu Venkata Narasimha Sharma <bvn_sharma@...> wrote:
> Dr.Haron,
>
> You must know some values of potential at the boundary nodes to
simulate, which could be obtained from measuring water levels in
observation wells. How many obserbation wells a basin have,
sufficency of collected data depends on what.
>
> thank you
> Dr.Haron
>
> dr_haron <dr_haron@...> wrote: Thanks Sharma
>
> But what values of initial head should I give for steady state
> simulation??
>
> --- In hydforum@yahoogroups.com, Bulusu Venkata Narasimha Sharma
> <bvn_sharma@> wrote:
> >
> > Dr.Haron,
> >
> > The problem may be treated Dirichlet problem where solution is
> to find head(potential) in the interior of the problem domain.
> >
> > regards
> > BVN Sharma
> >
> >
> > dr_haron <dr_haron@> wrote:
> > Hi there
> >
> > I will model a closed basin area, which does not interact with
any
> > surface water bodies or groundwater from out of the basin.
> Obviously,
> > the outer boundary is no flow boundary. However, in reality the
> > might be changing with time. So how to assign the boundary
> conditions?
> > I appreciate any help.
• In reality there is an outlet point in the basin or there is change in recharge/discharge conditions. This would take care. majumdar ... From: dr_haron To:
Message 8 of 9 , Jan 22, 2008
In reality there is an outlet point in the basin or there is change in recharge/discharge conditions. This would take care.

majumdar

----- Original Message -----
From: dr_haron
To: hydforum@yahoogroups.com
Sent: Thursday, January 10, 2008 2:01 PM
Subject: [hydforum] Question about Boundary conditions in groundwater model

Hi there

I will model a closed basin area, which does not interact with any
surface water bodies or groundwater from out of the basin. Obviously,
the outer boundary is no flow boundary. However, in reality the head
might be changing with time. So how to assign the boundary conditions?
I appreciate any help.
• Hello I think you could assign no-flow boundary at the borders of the model domain. The two parameters that will determine the behavior of the system are
Message 9 of 9 , Jan 25, 2008
Hello
I think you could assign no-flow boundary at the borders of the model domain. The two parameters that will determine the behavior of the system are Recharge and Extraction from the system. So, you need more details about recharge and extraction.

Regards
Ayman

Bulusu Venkata Narasimha Sharma <bvn_sharma@...> wrote:
Dr.Haron,

This is a case of potential problems. you may use finite differences, finite elements, boundary elements. in first the two are domain discretization is followed and the solution domain and problem domain are same. in the other method the solution domain and the problem domain are different.

I remeber an author HUNT priduced a book MATHEMATICAL MODELING OF GROUNDWATER FLOW published by BUTTERWORTHS.

bvn SHARMA

dr_haron <dr_haron@...> wrote:

No, I am using finite difference method. But I believe using
monitoring data is not valid in this case. I need some "reference"
there will be more than one solution.

--- In hydforum@yahoogroups.com, Bulusu Venkata Narasimha Sharma
<bvn_sharma@...> wrote:
>
> Dr.Haron,
>
> are you following boundary element numerical analysis?
>
> thank you
> sharma
>
>
> Bulusu Venkata Narasimha Sharma <bvn_sharma@...> wrote:
> Dr.Haron,
>
> You must know some values of potential at the boundary nodes to
simulate, which could be obtained from measuring water levels in
observation wells. How many obserbation wells a basin have,
sufficency of collected data depends on what.
>
> thank you
> Dr.Haron
>
> dr_haron <dr_haron@...> wrote: Thanks Sharma
>
> But what values of initial head should I give for steady state
> simulation??
>
> --- In hydforum@yahoogroups.com, Bulusu Venkata Narasimha Sharma
> <bvn_sharma@> wrote:
> >
> > Dr.Haron,
> >
> > The problem may be treated Dirichlet problem where solution is
> to find head(potential) in the interior of the problem domain.
> >
> > regards
> > BVN Sharma
> >
> >
> > dr_haron <dr_haron@> wrote:
> > Hi there
> >
> > I will model a closed basin area, which does not interact with
any
> > surface water bodies or groundwater from out of the basin.
> Obviously,
> > the outer boundary is no flow boundary. However, in reality the