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From: Craig Dalton
To: “cameron [via HEC-RAS Help]”
Subject: RE: Lateral Stucture Split Flow Optimization Failure
Thread-Topic: Lateral Stucture Split Flow Optimization Failure
Thread-Index: AQHQPqPt4L2zurW+90+Iy+R+DOrujpzdhkdw
Date: Mon, 2 Feb 2015 19:26:20 +0000
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Thanks for your response Cameron.

I removed the erroneous cross-section and adjusted my weir structure statio=
ning to reflect its actual profile. I changed my distribution of the weir =
flows to “over multiple xs” and entered in the weir station intersections f=
or the side channel cross-sections. When I attempt to run the steady flow =
analysis with the lateral flow optimization turned on the program begins th=
e calculations but then stalls. It produces no errors and I am forced to h=
it the stop button to terminate the computation. I have read that during a=
steady flow analysis the program will typically hang up on the cross-secti=
on of error (i.e. bridge/culverts sections) however in my case it is the ve=
ry first cross-section with fairly simple geometry. I attempted to input a=
n unsteady flow as you mentioned but it produced similar results with the p=
rogram locking up mid-calculation. The program runs with flow optimization=
turned off but this doesn’t allow the flow of water between the reaches. =
Any suggestions? I have posted a link to the project folder. Thank you.

https://www.dropbox.com/sh/ju0qnt0x4ppibal/AACc0pHceARQPCtWBGw889Lka?dl=3D0

Craig Dalton, P.E.
[email protected]
(406) 459-8456

[PEC LOGO-page1]
2101 Overland Ave * Billings, MT 59102
http://www.performance-ec.com<http://www.performance-ec.com>

This message is for the sole use of the intended recipients and may contain=
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, please contact the sender by reply e-mail and destroy all copies of the o=
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us checks before opening an attachment. Thank you for your cooperation.

From: cameron [via HEC-RAS Help] [mailto:[email protected]=
.com]
Sent: Sunday, February 01, 2015 9:51 PM
To: Craig Dalton
Subject: Re: Lateral Stucture Split Flow Optimization Failure

a few things I noticed,

1. XS 90883.06 does not appear to be in the correct location in plan view. =
As I scrolled through past this cross-section it jumped (skipped) multiple=
cross-sections.
2. There should probably be some ineffective flow areas added to the model=
, the locations I noticed were around 71602. This will help increase the w=
ater surface elevation which should also help stabilize it.
3. you should add weir stationing at HW cross-sections in the lateral stru=
cture options as the locations where the cross-sections intersect the later=
al structure should be based on actual location and not the reach length.
4. A better initial guess for the split flow in the flow options might help
5. The last thing you could try is to run the model in unsteady mode with a=
constant hydrograph. This is more stable sometimes and also has the optio=
n of adjusting stability coefficients to make it more stable if needed.
________________________________
If you reply to this email, your message will be added to the discussion be=
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http://hec-ras-help.1091112.n5.nabble.com/Lateral-Stucture-Split-Flow-Optim=
ization-Failure-tp1278p1279.html
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Thanks for your response Cameron.

 

I removed the erroneous cross-section=
and adjusted my weir structure stationing to reflect its actual profile.&n=
bsp; I changed my distribution of the weir flows to
“over multiple xs” and entered in the weir station intersectio=
ns for the side channel cross-sections.  When I attempt to run the ste=
ady flow analysis with the lateral flow optimization turned on the program =
begins the calculations but then stalls.  It produces
no errors and I am forced to hit the stop button to terminate the computat=
ion.  I have read that during a steady flow analysis the program will =
typically hang up on the cross-section of error (i.e. bridge/culverts secti=
ons) however in my case it is the very
first cross-section with fairly simple geometry.  I attempted to inpu=
t an unsteady flow as you mentioned but it produced similar results with th=
e program locking up mid-calculation.  The program runs with flow opti=
mization turned off but this doesn’t allow
the flow of water between the reaches.  Any suggestions?  I have=
posted a link to the project folder.  Thank you.

 

https://www.dropbox.com/=
sh/ju0qnt0x4ppibal/AACc0pHceARQPCtWBGw889Lka?dl=3D0

 

Craig Dalton, P.E.

[email protected]

(406) 459-8456

 

2101 Overland Ave
•
Billings, MT 59102

w=
ww.performance-ec.com

 

 

 

 

This message is for the so=
le use of the intended recipients and may contain confidential and privileg=
ed information. Any unauthorized review, use, disclosure
or distribution is prohibited. If you are not an intended recipient, pleas=
e contact the sender by reply e-mail and destroy all copies of the original=
message. E-mail attachments may contain viruses which could damage your co=
mputer. While we have taken precautions
to minimize this risk, we cannot accept liability for such damage and you =
should carry out your own virus checks before opening an attachment. Thank =
you for your cooperation.

 

From: cameron [via HEC-RAS Help] [ma=
ilto:ml-node+[email protected]]

Sent: Sunday, February 01, 2015 9:51 PM
To: Craig Dalton
Subject: Re: Lateral Stucture Split Flow Optimization Failure

 

a few things I notice=
d,

1. XS 90883.06 does not appear to be in the correct location in plan view. =
 As I scrolled through past this cross-section it jumped (skipped) mul=
tiple cross-sections.

2.  There should probably be some ineffective flow areas added to the =
model, the locations I noticed were around 71602.  This will help incr=
ease the water surface elevation which should also help stabilize it. &nbsp=
;

3.  you should add weir stationing at HW cross-sections in the lateral=
structure options as the locations where the cross-sections intersect the =
lateral structure should be based on actual location and not the reach leng=
th.

4. A better initial guess for the split flow in the flow options might help=

5. The last thing you could try is to run the model in unsteady mode with a=
constant hydrograph.  This is more stable sometimes and also has the =
option of adjusting stability coefficients to make it more stable if needed=
.  

---

If you reply to this email, your mes=
sage will be added to the discussion below:

http://h=
ec-ras-help.1091112.n5.nabble.com/Lateral-Stucture-Split-Flow-Optimization-=
Failure-tp1278p1279.html

To unsubsc=
ribe from Lateral Stucture Split Flow Optimization Failure,
click here.
N=
AML

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