Hi Persican25

If your mesh boundary and bed boundary are the same, then you will face this
problem. What happens, when mesh file is generated, one or more nodes may be
created by the program which are outside of the bed boundary due
to truncation errors. To avoid this problem, make sure that your mesh boundary
is within the bed boundary. Or, you can put some extra nodes in your bed file
so that your bed boundary is bigger than your mesh boundary.  Hope this will
help you.

Best of luck!

Mostafa



________________________________
From: "flow@..." <flow@...>
To: persican25 <river2d@...>
Sent: Thursday, August 25, 2011 3:45 PM
Subject: Re: [river2d-forum] Re: Bed file + meshing


 
Hello persican25,

How are you doing with these problems?

I've had my own problems with River2D but managed to solve them, unfortunately
some solutions involve very tedious work.

If you're still stuck, let me know. Then I'll take some time to look into your
files.

Kind regards.

G

Wednesday, August 3, 2011, 9:00:52 PM, you wrote:
> Other links for the files:
> Bed : http://www.datafilehost.com/download-5458db93.html
> Mesh : http://www.datafilehost.com/download-fddd0196.html

> --- In river2d@..., Persican Persican <persican25@...> wrote:

>> Hi again everyone.
>> I'm trying to make my own meshing file in another software (matlab) that
gives me a better discretization of my lake.

>> I would like to open my generated mesh file into R2D_mesh to apply some
modifications and set the inflow/outflow boundaries.
>> The bed file open successfully but when I try to open the mesh file it
crashes.
>> Here's a quick example with a square:
>> Bed file: http://www.filedropper.com/lspbedfileMesh ile:
http://www.filedropper.com/lspmeshfile
>> If you open the bed and mesh files in a text editor it seems everything is
fine but I cant find where I'm doing mistake in creating my own mesh file.
>> Any help would be helpful!
>> Thank in advance,Phil

>> [Non-text portions of this message have been removed]

> ------------------------------------

> Yahoo! Groups Links

--
deflow

Gerrit Kiers
gerrit.kiers@...

gerrit.kiers@...




[Non-text portions of this message have been removed]

Hi there.

I'm still working around it. But I think I can make it. It wont be elegant,
but... :)

--- In river2d@..., flow@... wrote:
>
> Hello persican25,
>
> How are you doing with these problems?
>
> I've had my own problems with River2D but managed to solve them, unfortunately
some solutions involve very tedious work.
>
> If you're still stuck, let me know. Then I'll take some time to look into your
files.
>
> Kind regards.
>
> G
>
> Wednesday, August 3, 2011, 9:00:52 PM, you wrote:
> > Other links for the files:
> > Bed : http://www.datafilehost.com/download-5458db93.html
> > Mesh : http://www.datafilehost.com/download-fddd0196.html
>
>
>
> > --- In river2d@..., Persican Persican <persican25@> wrote:
>
> >> Hi again everyone.
> >> I'm trying to make my own meshing file in another software (matlab) that
gives me a better discretization of my lake.
>
> >> I would like to open my generated mesh file into R2D_mesh to apply some
modifications and set the inflow/outflow boundaries.
> >> The bed file open successfully but when I try to open the mesh file it
crashes.
> >> Here's a quick example with a square:
> >> Bed file: http://www.filedropper.com/lspbedfileMesh ile:
http://www.filedropper.com/lspmeshfile
> >> If you open the bed and mesh files in a text editor it seems everything is
fine but I cant find where I'm doing mistake in creating my own mesh file.
> >> Any help would be helpful!
> >> Thank in advance,Phil
>
> >> [Non-text portions of this message have been removed]
>
>
>
>
>
> > ------------------------------------
>
> > Yahoo! Groups Links
>
>
>
>
>
> --
> deflow
>
> Gerrit Kiers
> gerrit.kiers@...
>
> gerrit.kiers@...
>

Hi Mostafa.

I really appreciate the help you guys give to me. This is exactly what I'm
currently developing in Matlab. I'll had extra nodes. Hope it works!


--- In river2d@..., Mostafa ali <wremostafa@...> wrote:
>
> Hi Persican25
>
> If your mesh boundary and bed boundary are the same, then you will face this
problem. What happens, when mesh file is generated, one or more nodes may be
created by the program which are outside of the bed boundary due
to truncation errors. To avoid this problem, make sure that your mesh boundary
is within the bed boundary. Or, you can put some extra nodes in your bed file
so that your bed boundary is bigger than your mesh boundary.  Hope this will
help you.
>
> Best of luck!
>
> Mostafa
>
>
>
> ________________________________
> From: "flow@..." <flow@...>
> To: persican25 <river2d@...>
> Sent: Thursday, August 25, 2011 3:45 PM
> Subject: Re: [river2d-forum] Re: Bed file + meshing
>
>
>  
> Hello persican25,
>
> How are you doing with these problems?
>
> I've had my own problems with River2D but managed to solve them, unfortunately
some solutions involve very tedious work.
>
> If you're still stuck, let me know. Then I'll take some time to look into your
files.
>
> Kind regards.
>
> G
>
> Wednesday, August 3, 2011, 9:00:52 PM, you wrote:
> > Other links for the files:
> > Bed : http://www.datafilehost.com/download-5458db93.html
> > Mesh : http://www.datafilehost.com/download-fddd0196.html
>
> > --- In river2d@..., Persican Persican <persican25@> wrote:
>
> >> Hi again everyone.
> >> I'm trying to make my own meshing file in another software (matlab) that
gives me a better discretization of my lake.
>
> >> I would like to open my generated mesh file into R2D_mesh to apply some
modifications and set the inflow/outflow boundaries.
> >> The bed file open successfully but when I try to open the mesh file it
crashes.
> >> Here's a quick example with a square:
> >> Bed file: http://www.filedropper.com/lspbedfileMesh ile:
http://www.filedropper.com/lspmeshfile
> >> If you open the bed and mesh files in a text editor it seems everything is
fine but I cant find where I'm doing mistake in creating my own mesh file.
> >> Any help would be helpful!
> >> Thank in advance,Phil
>
> >> [Non-text portions of this message have been removed]
>
> > ------------------------------------
>
> > Yahoo! Groups Links
>
> --
> deflow
>
> Gerrit Kiers
> gerrit.kiers@...
>
> gerrit.kiers@...
>
>
>
>
> [Non-text portions of this message have been removed]
>

Hi everyone.

I'm currently setting bed roughness in a last step to finish the preparation of
my bed file.

To do so, I was using the equations 2,3 and 4 in R2D_Bed.pdf

More particularly, in eq. 4, I'm using H as an approximation of the A/P ratio.

After calculating ks, I have very small values (around 1x10-4). This is
essentially due to the high H value that I'm using. For instance, for each
point, I set H as the water depth of my river (around 13m).

So, my question was regarding the roughness high. Is that normal to have such
small value? I ask because in tutorial, they have river of around same depth but
they are using ks of 0.1 which is far from my values.

Regards,
Phil

FYI, I adopted a not dissimilar tactic to improve control of mesh nodes.
The project was a few months ago now, but in broad terms the point cloud was
developed in 'ms_excel', viewed in 'r2d_bed' and then pasted into
'r2d_mesh'.
Subject to a few rules of engagement, the procedure worked well, although
looking back I wish I had introduced more break-lines to better manage the
mesh in relation to terrain features.
(At the start I was warned that breaklines would extend solution times . . .
  but this was never tested)
The project was a 40km 400 cumec meandering river in a *c.*40 sqkm
floodplain.
GIS package 'Globalmapper' was a big help developing the lidar datasets.

George Whitworth
----------------------

On Wed, Aug 31, 2011 at 6:54 AM, persican25 <persican25@...> wrote:

> Hi there.
>
> I'm still working around it. But I think I can make it. It wont be elegant,
> but... :)
>
> --- In river2d@..., flow@... wrote:
> >
> > Hello persican25,
> >
> > How are you doing with these problems?
> >
> > I've had my own problems with River2D but managed to solve them,
> unfortunately some solutions involve very tedious work.
> >
> > If you're still stuck, let me know. Then I'll take some time to look into
> your files.
> >
> > Kind regards.
> >
> > G
> >
> > Wednesday, August 3, 2011, 9:00:52 PM, you wrote:
> > > Other links for the files:
> > > Bed : http://www.datafilehost.com/download-5458db93.html
> > > Mesh : http://www.datafilehost.com/download-fddd0196.html
> >
> >
> >
> > > --- In river2d@..., Persican Persican <persican25@> wrote:
> >
> > >> Hi again everyone.
> > >> I'm trying to make my own meshing file in another software (matlab)
> that gives me a better discretization of my lake.
> >
> > >> I would like to open my generated mesh file into R2D_mesh to apply
> some modifications and set the inflow/outflow boundaries.
> > >> The bed file open successfully but when I try to open the mesh file it
> crashes.
> > >> Here's a quick example with a square:
> > >> Bed file: http://www.filedropper.com/lspbedfileMesh ile:
> http://www.filedropper.com/lspmeshfile
> > >> If you open the bed and mesh files in a text editor it seems
> everything is fine but I cant find where I'm doing mistake in creating my
> own mesh file.
> > >> Any help would be helpful!
> > >> Thank in advance,Phil
> >
> > >> [Non-text portions of this message have been removed]
> >
> >
> >
> >
> >
> > > ------------------------------------
> >
> > > Yahoo! Groups Links
> >
> >
> >
> >
> >
> > --
> > deflow
> >
> > Gerrit Kiers
> > gerrit.kiers@...
> >
> > gerrit.kiers@...
> >
>
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>
>


[Non-text portions of this message have been removed]

Hi everyone.

I would like to know if there's a way to retrieve the u v (north/east)
components from the velocity field?

I'm able to drop magnitude in a file, but the display only let me to see  x and
y discharge. So, I was wondering how to get the u and v velocity at each node of
the meshing.

I looked into the .cdg file, but I cant find where this information if stored.

Regards,
Phil

Hello Phil,

I tend to believe that you can  use the x and y discharge as components to
adjust your velocity magnitude since the direction of the combination of the
components x and y of the discharge are in the same direction of the velocity
magnitude.

I hope it hel�s.

Regards,

Marcus Fernandes Araujo Filho
Engenheiro Civil
Superintend�ncia de Estudos B�sicos
Intertechne Consultores S.A
+55 41 3219-7637 - Direto
+55 41 3219-7200 - Geral
+55 41 3219-7848 - Fax
mfaf@...
www.intertechne.com.br<http://www.intertechne.com.br/>

De: river2d@... [mailto:river2d@...] Em nome de persican25
Enviada em: Tuesday, September 06, 2011 11:52 AM
Para: river2d@...
Assunto: [river2d-forum] u v components



Hi everyone.

I would like to know if there's a way to retrieve the u v (north/east)
components from the velocity field?

I'm able to drop magnitude in a file, but the display only let me to see x and y
discharge. So, I was wondering how to get the u and v velocity at each node of
the meshing.

I looked into the .cdg file, but I cant find where this information if stored.

Regards,
Phil



[Non-text portions of this message have been removed]

Hi Marcus and thank you for your help, it is appreciated.

For instance, how would you retrieve the u v component? I'm not sure to
understand you correctly. What I have for the moment is the  discharge and the
magnitude only like:

node x_dis y_dis magnitude
1    0.698223 1.051180 0.4017


However, if I calculate the magnitude

sqrt(0.698223^2 + 1.051180^2)

I dont get 0.4017.

So, what I understand is to use x_dist and y_dis to find the direction (theta)
and simply use the result in combination with the magnitude to find u and v?

Like:

u = cos(theta) * magnitude
v = sin(theta) * magnitude

Am I understanding correctly?

Phil



--- In river2d@..., Marcus Fernandes Araujo Filho <MFAF@...> wrote:
>
> Hello Phil,
>
> I tend to believe that you can  use the x and y discharge as components to
adjust your velocity magnitude since the direction of the combination of the
components x and y of the discharge are in the same direction of the velocity
magnitude.
>
> I hope it hel�s.
>
> Regards,
>
> Marcus Fernandes Araujo Filho
> Engenheiro Civil
> Superintend�ncia de Estudos B�sicos
> Intertechne Consultores S.A
> +55 41 3219-7637 - Direto
> +55 41 3219-7200 - Geral
> +55 41 3219-7848 - Fax
> mfaf@...
> www.intertechne.com.br<http://www.intertechne.com.br/>
>
> De: river2d@... [mailto:river2d@...] Em nome de
persican25
> Enviada em: Tuesday, September 06, 2011 11:52 AM
> Para: river2d@...
> Assunto: [river2d-forum] u v components
>
>
>
> Hi everyone.
>
> I would like to know if there's a way to retrieve the u v (north/east)
components from the velocity field?
>
> I'm able to drop magnitude in a file, but the display only let me to see x and
y discharge. So, I was wondering how to get the u and v velocity at each node of
the meshing.
>
> I looked into the .cdg file, but I cant find where this information if stored.
>
> Regards,
> Phil
>
>
>
> [Non-text portions of this message have been removed]
>

Hello Phil,

You were able to explain much better than I did. You are correct, to use the
theta value formed by the qx and qy variables to find u and v using the
magnitude of the velocity. I think it is possible since I believe discharge and
velocity should have the same direction as a vector.

Let me know if it works.

Best regards,

Marcus Fernandes Araujo Filho
Engenheiro Civil
Superintend�ncia de Estudos B�sicos
Intertechne Consultores S.A
+55 41 3219-7637 - Direto
+55 41 3219-7200 - Geral
+55 41 3219-7848 - Fax
mfaf@...
www.intertechne.com.br<http://www.intertechne.com.br/>

De: river2d@... [mailto:river2d@...] Em nome de persican25
Enviada em: Tuesday, September 06, 2011 4:50 PM
Para: river2d@...
Assunto: Re: RES: [river2d-forum] u v components



Hi Marcus and thank you for your help, it is appreciated.

For instance, how would you retrieve the u v component? I'm not sure to
understand you correctly. What I have for the moment is the discharge and the
magnitude only like:

node x_dis y_dis magnitude
1 0.698223 1.051180 0.4017

However, if I calculate the magnitude

sqrt(0.698223^2 + 1.051180^2)

I dont get 0.4017.

So, what I understand is to use x_dist and y_dis to find the direction (theta)
and simply use the result in combination with the magnitude to find u and v?

Like:

u = cos(theta) * magnitude
v = sin(theta) * magnitude

Am I understanding correctly?

Phil

--- In river2d@...<mailto:river2d%40yahoogroups.ca>, Marcus Fernandes
Araujo Filho <MFAF@...> wrote:
>
> Hello Phil,
>
> I tend to believe that you can use the x and y discharge as components to
adjust your velocity magnitude since the direction of the combination of the
components x and y of the discharge are in the same direction of the velocity
magnitude.
>
> I hope it hel�s.
>
> Regards,
>
> Marcus Fernandes Araujo Filho
> Engenheiro Civil
> Superintend�ncia de Estudos B�sicos
> Intertechne Consultores S.A
> +55 41 3219-7637 - Direto
> +55 41 3219-7200 - Geral
> +55 41 3219-7848 - Fax
> mfaf@...
> www.intertechne.com.br<http://www.intertechne.com.br/>
>
> De: river2d@...<mailto:river2d%40yahoogroups.ca>
[mailto:river2d@...<mailto:river2d%40yahoogroups.ca>] Em nome de
persican25
> Enviada em: Tuesday, September 06, 2011 11:52 AM
> Para: river2d@...<mailto:river2d%40yahoogroups.ca>
> Assunto: [river2d-forum] u v components
>
>
>
> Hi everyone.
>
> I would like to know if there's a way to retrieve the u v (north/east)
components from the velocity field?
>
> I'm able to drop magnitude in a file, but the display only let me to see x and
y discharge. So, I was wondering how to get the u and v velocity at each node of
the meshing.
>
> I looked into the .cdg file, but I cant find where this information if stored.
>
> Regards,
> Phil
>
>
>
> [Non-text portions of this message have been removed]
>



[Non-text portions of this message have been removed]

Thank you Marcus.

I'll try that tomorrow and let you know how it works!

Regards,
Phil

--- In river2d@..., Marcus Fernandes Araujo Filho <MFAF@...> wrote:
>
> Hello Phil,
>
> You were able to explain much better than I did. You are correct, to use the
theta value formed by the qx and qy variables to find u and v using the
magnitude of the velocity. I think it is possible since I believe discharge and
velocity should have the same direction as a vector.
>
> Let me know if it works.
>
> Best regards,
>
> Marcus Fernandes Araujo Filho
> Engenheiro Civil
> Superintend�ncia de Estudos B�sicos
> Intertechne Consultores S.A
> +55 41 3219-7637 - Direto
> +55 41 3219-7200 - Geral
> +55 41 3219-7848 - Fax
> mfaf@...
> www.intertechne.com.br<http://www.intertechne.com.br/>
>
> De: river2d@... [mailto:river2d@...] Em nome de
persican25
> Enviada em: Tuesday, September 06, 2011 4:50 PM
> Para: river2d@...
> Assunto: Re: RES: [river2d-forum] u v components
>
>
>
> Hi Marcus and thank you for your help, it is appreciated.
>
> For instance, how would you retrieve the u v component? I'm not sure to
understand you correctly. What I have for the moment is the discharge and the
magnitude only like:
>
> node x_dis y_dis magnitude
> 1 0.698223 1.051180 0.4017
>
> However, if I calculate the magnitude
>
> sqrt(0.698223^2 + 1.051180^2)
>
> I dont get 0.4017.
>
> So, what I understand is to use x_dist and y_dis to find the direction (theta)
and simply use the result in combination with the magnitude to find u and v?
>
> Like:
>
> u = cos(theta) * magnitude
> v = sin(theta) * magnitude
>
> Am I understanding correctly?
>
> Phil
>
> --- In river2d@...<mailto:river2d%40yahoogroups.ca>, Marcus
Fernandes Araujo Filho <MFAF@> wrote:
> >
> > Hello Phil,
> >
> > I tend to believe that you can use the x and y discharge as components to
adjust your velocity magnitude since the direction of the combination of the
components x and y of the discharge are in the same direction of the velocity
magnitude.
> >
> > I hope it hel�s.
> >
> > Regards,
> >
> > Marcus Fernandes Araujo Filho
> > Engenheiro Civil
> > Superintend�ncia de Estudos B�sicos
> > Intertechne Consultores S.A
> > +55 41 3219-7637 - Direto
> > +55 41 3219-7200 - Geral
> > +55 41 3219-7848 - Fax
> > mfaf@
> > www.intertechne.com.br<http://www.intertechne.com.br/>
> >
> > De: river2d@...<mailto:river2d%40yahoogroups.ca>
[mailto:river2d@...<mailto:river2d%40yahoogroups.ca>] Em nome de
persican25
> > Enviada em: Tuesday, September 06, 2011 11:52 AM
> > Para: river2d@...<mailto:river2d%40yahoogroups.ca>
> > Assunto: [river2d-forum] u v components
> >
> >
> >
> > Hi everyone.
> >
> > I would like to know if there's a way to retrieve the u v (north/east)
components from the velocity field?
> >
> > I'm able to drop magnitude in a file, but the display only let me to see x
and y discharge. So, I was wondering how to get the u and v velocity at each
node of the meshing.
> >
> > I looked into the .cdg file, but I cant find where this information if
stored.
> >
> > Regards,
> > Phil
> >
> >
> >
> > [Non-text portions of this message have been removed]
> >
>
>
>
> [Non-text portions of this message have been removed]
>

Hi Marcus.

Thank you for your help. It worked perfectly!

Regards,
Phil


--- In river2d@..., Marcus Fernandes Araujo Filho <MFAF@...> wrote:
>
> Hello Phil,
>
> You were able to explain much better than I did. You are correct, to use the
theta value formed by the qx and qy variables to find u and v using the
magnitude of the velocity. I think it is possible since I believe discharge and
velocity should have the same direction as a vector.
>
> Let me know if it works.
>
> Best regards,
>
> Marcus Fernandes Araujo Filho
> Engenheiro Civil
> Superintend�ncia de Estudos B�sicos
> Intertechne Consultores S.A
> +55 41 3219-7637 - Direto
> +55 41 3219-7200 - Geral
> +55 41 3219-7848 - Fax
> mfaf@...
> www.intertechne.com.br<http://www.intertechne.com.br/>
>
> De: river2d@... [mailto:river2d@...] Em nome de
persican25
> Enviada em: Tuesday, September 06, 2011 4:50 PM
> Para: river2d@...
> Assunto: Re: RES: [river2d-forum] u v components
>
>
>
> Hi Marcus and thank you for your help, it is appreciated.
>
> For instance, how would you retrieve the u v component? I'm not sure to
understand you correctly. What I have for the moment is the discharge and the
magnitude only like:
>
> node x_dis y_dis magnitude
> 1 0.698223 1.051180 0.4017
>
> However, if I calculate the magnitude
>
> sqrt(0.698223^2 + 1.051180^2)
>
> I dont get 0.4017.
>
> So, what I understand is to use x_dist and y_dis to find the direction (theta)
and simply use the result in combination with the magnitude to find u and v?
>
> Like:
>
> u = cos(theta) * magnitude
> v = sin(theta) * magnitude
>
> Am I understanding correctly?
>
> Phil
>
> --- In river2d@...<mailto:river2d%40yahoogroups.ca>, Marcus
Fernandes Araujo Filho <MFAF@> wrote:
> >
> > Hello Phil,
> >
> > I tend to believe that you can use the x and y discharge as components to
adjust your velocity magnitude since the direction of the combination of the
components x and y of the discharge are in the same direction of the velocity
magnitude.
> >
> > I hope it hel�s.
> >
> > Regards,
> >
> > Marcus Fernandes Araujo Filho
> > Engenheiro Civil
> > Superintend�ncia de Estudos B�sicos
> > Intertechne Consultores S.A
> > +55 41 3219-7637 - Direto
> > +55 41 3219-7200 - Geral
> > +55 41 3219-7848 - Fax
> > mfaf@
> > www.intertechne.com.br<http://www.intertechne.com.br/>
> >
> > De: river2d@...<mailto:river2d%40yahoogroups.ca>
[mailto:river2d@...<mailto:river2d%40yahoogroups.ca>] Em nome de
persican25
> > Enviada em: Tuesday, September 06, 2011 11:52 AM
> > Para: river2d@...<mailto:river2d%40yahoogroups.ca>
> > Assunto: [river2d-forum] u v components
> >
> >
> >
> > Hi everyone.
> >
> > I would like to know if there's a way to retrieve the u v (north/east)
components from the velocity field?
> >
> > I'm able to drop magnitude in a file, but the display only let me to see x
and y discharge. So, I was wondering how to get the u and v velocity at each
node of the meshing.
> >
> > I looked into the .cdg file, but I cant find where this information if
stored.
> >
> > Regards,
> > Phil
> >
> >
> >
> > [Non-text portions of this message have been removed]
> >
>
>
>
> [Non-text portions of this message have been removed]
>

Dear all,



I am looking at modelling some kind of 2D simple tracer transport
simulation.

I read an article referring to �River2D mix� but I cannot find this
extension anywhere (I only found the latest versions of River2D and river 2D
Morphology),

Could anyone help me with that?



Thanks a lot for your help.



Regards



Nasrine


[Non-text portions of this message have been removed]

I am also looking to do something similar, particle transport.  Any help or
suggestions would be fantastic. Thanks,
Matt

 
Matthew T. Wegener
5741 Libby Hall
Room 204
Orono, ME 04469




________________________________
From: Nasrine Tomasi <nas.tomasi@...>
To: river2d@...
Sent: Tuesday, September 13, 2011 7:56 PM
Subject: [river2d-forum] River 2D Mix - Tracer Transport Simulation

Dear all,



I am looking at modelling some kind of 2D simple tracer transport
simulation.

I read an article referring to “River2D mix” but I cannot find this
extension anywhere (I only found the latest versions of River2D and river 2D
Morphology),

Could anyone help me with that?



Thanks a lot for your help.



Regards



Nasrine


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------------------------------------

Yahoo! Groups Links



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River2D doesn't have tracer transport yet but Telemac2D does. You can export
your River2D mesh using the latest version of River2D Morphology found at
mediafire.com/r2dm.�Under the "Output" Menu option there is a button to create
T3S files for Blue Kenue. Select this option and it will create 6 files for you.
Load the _BOTTOM.T3S file into Blue Kenue and then create your geometry selafin
file for Telemac.

Installation of Telemac can be quite tricky so I've also prepared some
instructions on how to install it if you have the Intel Visual Fortran Compiler.

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Hi there,

I am just learning the River2D. what is the best way to learn? Currently I am
working with your exercise materials. Here is a question:

How do you define exterior boundary, what actually is this? Is this the same as
computational boundary, as mentioned in River2D-The basics.

Thanks.

Kangsheng

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Using River2D, I got a question. Is the bed elevation showed in contour in .cdg
and bed contour in .bed the same? They look the same, but not the exactly the
same, do not why.

Hello West,

No, there not the same: the contours in .bed are generated from the terrain
measurements stored in your .bed file, the contours in the .cdg are a function
of your mesh as well, as these contours are generated by the representation of
your terrain by your mesh.

So, the way the two are alike is a measure of the quality of the schematisation
of your terrain.



You wrote:

> Using River2D, I got a question. Is the bed elevation showed in
> contour in .cdg and bed contour in .bed the same? They look the
> same, but not the exactly the same, do not why.





> ------------------------------------

> Yahoo! Groups Links





deflow

Dear West,

The two elevations should be different. What happens is that you create a bed
file and a mesh file, so what you will have as a bed information is the
elevations extracted from the bed file by each node of your mesh file. That is
the reason why I always say that regardless the quality of your bed file, your
bed information is as good as you can afford with the size of your mesh.

Best regards,

Marcus Fernandes Araujo Filho
Engenheiro Civil (Civil Engineer)
Superintend�ncia de Estudos B�sicos
Intertechne Consultores S.A
+55 41 3219-7637 - Direto
+55 41 3219-7200 - Geral
+55 41 3219-7848 - Fax
mfaf@...
www.intertechne.com.br<http://www.intertechne.com.br/>

De: river2d@... [mailto:river2d@...] Em nome de West Cott
Enviada em: Tuesday, October 04, 2011 7:11 PM
Para: river2d@...
Assunto: [river2d-forum] bed elevation in contour and bed contour



Using River2D, I got a question. Is the bed elevation showed in contour in .cdg
and bed contour in .bed the same? They look the same, but not the exactly the
same, do not why.



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Did anyone find an answer to this question?

--- In river2d@..., "Anut Marpleis" <marpleis.anut@...> wrote:
>
> Is River2D an open source program?    What programming language(s) is
> it written with? Is it all programmed in one language, or were
> different languages used for the numerics vs. the GUI?
>
> Thanks.
>
> Anut Marpleis
>

It is said that copying the bed breaklines into the mesh is normally the most
effective ways to reduce the elevation error between .bed and .msh.

So can we do this (or is it the best way in using mesh): In the first operation
of mesh, we just simply copy all bed breaklines into mesh, then see QI and do
filling the interior with nodes, if QI is low?

Thanks.

Kangsheng

Hi,
 
Recently I am using River 2D to build a three components model including a lake,
a weir control structure and a diversion channel downstream of the weir.
 
I defined both boundaries in .cdg program. Lake boundary uses constant flow and
downstream diversion channel boundary uses constant water level.
 
I also reset the “Initial Condition” in .cdg program. To my surprise, the
initial condition makes a big difference of the final results. I used different
initial conditions, basically if initial condition was set to high, the computed
water levels stayed high. I tried initial conditions from 801 to 803.8 ft, the
computed water levels were from 802.1 to 803.9 ft. I thought when flow reaches
balance, the results would be same no matter how you set the initial condition.
 
Does anyone have idea why this happen? Is it because I set up model wrong?
 
Thanks in advance for your help.

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Hi folks,

Could someone summarize the basic steps in developing a model from a text file
containing bed data?  The tutorial and help files are particularly clear.

I'm trying to develop a simple model of a trapezoidal channel (e.g. 4-point
cross sections).

I'm familiar with CFD (and even running R2D) but development of a model from bed
data in a text file is proving confusing.

Thanks in advance,
Brett

Hello, Has anyone had success in modeling a bridge or culvert in River2D? It is
unclear how the bed geometry could be modified to accomodate a complicated
structure opening like that. The modeling of a dam is a bit more
straightforward, but the vertical walls seem to be a problem. Thanks, Jessica

Jessica - You can exclude the bridge piers from the computational domain by
defining the boundary (of the piers) in a clockwise order.  See the user guide
for more detail.  In general, many models use counterclockwise ordering for the
elements and clockwise ordering of any closed features such as islands or
structures.

Modelling flow near a culvert would be a bit more complicated than a bridge.
 If a 1D model will not suffice, you could try something like producing a
rating curve for the culvert and applying that as the downstream boundary
condition.  This might mean running two models, one upstream and one downstream
of the culvert.

Josh


________________________________
From: jessicalouisos <jessica.louisos@...>
To: river2d@...
Sent: Friday, November 11, 2011 11:46:03 AM
Subject: [river2d-forum] Modeling Bridges, Culverts, Dam


 
Hello, Has anyone had success in modeling a bridge or culvert in River2D? It is
unclear how the bed geometry could be modified to accomodate a complicated
structure opening like that. The modeling of a dam is a bit more
straightforward, but the vertical walls seem to be a problem. Thanks, Jessica




[Non-text portions of this message have been removed]

Hello,
I'm running an analysis of a concrete lined channel that goes supercritical
at two points under bridges. Unfortunately all of my data is in imperial
units and not easily converted (x, y and z are in a single column in Excel)
and when I run the program, the time increment keeps resetting and I'm not
sure why. I think my boundary conditions and mesh are ok, but I'm not sure
what else to check. Any help would be appreciated. Thanks!

-Travis


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Hello,
I was able to convert the imperial units to metric units, but I'm still getting
the same problems. Also, what value of Ks should I be using for a concrete lined
channel? I used the Ks calculator and I got 0.001, which is significantly lower
than the starting estimate of 0.1. Is that reasonable?

-Travis

--- In river2d@..., Travis Wylde <wylde@...> wrote:
>
> Hello,
> I'm running an analysis of a concrete lined channel that goes supercritical
> at two points under bridges. Unfortunately all of my data is in imperial
> units and not easily converted (x, y and z are in a single column in Excel)
> and when I run the program, the time increment keeps resetting and I'm not
> sure why. I think my boundary conditions and mesh are ok, but I'm not sure
> what else to check. Any help would be appreciated. Thanks!
>
> -Travis
>
>
> [Non-text portions of this message have been removed]
>

Hello,

I am trying to model a river flow condition for a 45km long river section with a
barrage across it and need some help regarding the same. I have the following
doubts:

1. I am giving my model an initial inflow and outflow water surface elevation
estimate and my model always gives twice the estimated inflow elevation at the
inflow section and subsequent downstream sections except near the outflow
section. How to correct this?

2. Can you please brief me about how to calibrate my model. After running the
model to achieve steady flow conditions, i am redefining inflow, outflow
conditions and running the model again. Even after doing this my model is giving
unreasonable estimates of water surface elevation near the inflow section. What
might be the mistake that i am doing?

3.I want to run my model for 100000cumecs and since the outer boundary
was getting wet for the above flow, i moved it away from the top of the banks to
about 2km away from the banks. I am running for the 'Steady flow' condition with
a 11.5m and 10m inflow and outflow water surface elevation estimate and the
model is achieving steady flow conditions at around 65000sec. I have tried using
an inflow hydrograph and a rating curve instead of initial flow elevation
estimates and am getting erroneous results.

If you find anything that i am doing wrong from the above information please let
me know. It would be of great help.
-Vivek

Hi ... how I create the file ".bcr" to define the outflow condition stage-total
discharge relationship (rating curve) ?

hello everybody,

i've got a question referring to equation (12) in river2D manual.
is it possible that there is a problem with the units in term 3?
(the one with the square root)

because the first part under the square root becomes [1/s], so does the third
part.

unfortunately the second part becomes [1/s�], which makes the addition of the
parts impossible.

can someone help me out with this problem? is there a simple typing error in the
users manual? for example leaving out a  (..)� in the first and third part?

thanks for your help and sorry for my grammar, i'm a german student.

Rocco Zimmermann