Margaret S. Petersen
doesn't require all of the construction, you mean?
No. If a bend is too sharp, too small a radius for the barge tow to follow along, the concave
A:
bank can be moved out to the ends of the spur dikes.After the area between the dikes fills
in with sediment, a longitudinal structure may be constructed along the river ends of the
dikes and becomes the new bank line.
Engineering. Okay. So a lot of your time then was spent in
This is on page 168 of
studies of the river?
Yes.
Analysis of data, and the banks themselves?
A:
With surveys and with aerial mosaics after every flood, and so forth. The actual design of
these structures was done in a section in design branch.
Structures?
Yes. But it was basic criteria, and we always reviewed designs in hydraulics.
Now, you develop all of the solutions, but would you model them all?
No.
In most cases, then, you assumed you wouldn't have a problem?
A:
The only locations that were modeled were in the vicinity of a lock and dam, where we
wanted to be sure that the currents either didn't go across the channel and adversely affect
tows that were entering or leaving the lock or areas downstream of the navigation lock and
where navigation depths might be marginally adequate. Flow downstream of the
spillway is confined, except at very high flows, and the cross section widens out downstream
of the lock. Where it widens velocities decrease and sediment tends to deposit. There are
various things that can be done to improve sediment transfer in such locations. That's the
kind1 of thing that would be modeled.
Previous Page
