A
sediment trap was constructed along a channel system as shown in the
photograph below. Under normal flow conditions, water is diverted
into the sediment trap (node C) by a weir placed across the channel
between nodes A and B. Sediment drops out in the pond because of
lower velocities. Under high flow conditions, a portion enters the
sediment trap but the diversion weir is simultaneously overtopped
resulting in a flow split. Water moves along the main channel from
node B to node D under these conditions. Water passing through the
sediment trap is reunited with
the main channel through a large box culvert near node D. The
inverts of the box culvert are obviously well below the crest of the
diversion structure. |
|
Aerial
©2007, Google
ICPR
Modeling Considerations
Incorporating
a sediment trap like the one shown above or similar offline storage
feature into your model is a relatively straight forward matter.
First of all, a table of stages and corresponding areas would be needed
for node C to reflect the available storage in it. Then, node A
would be connected to node B with a weir link and simultaneously connected
to node C with either a weir link or a short channel link depending on the
intake configuration into the sediment trap. Node B would be
connected to node D with a channel link, and node C would be connect to
node D with a pipe link. |
