Transcript
00:03
in info drainage. The one D two D. Analysis uses a one D simulation engine
00:08
to calculate the flows in the pipes,
00:10
manholes and other structures below the ground
00:13
in combination with the two D simulation engine
00:16
to predict flood flows across the catchment surface.
00:20
This enables the program to represent the
00:22
overflow from the sewer or channel network,
00:25
the movement of the flooded water on the surface
00:27
and the re entrance of the flooded water back into the sewer or channel network.
00:33
The one D simulation engine and the two D simulation engine runs simultaneously
00:38
during the one D two D analysis,
00:41
in order to enable dynamic coupling between the two engines.
00:45
Each simulation engine runs with its own computational time step
00:49
and the two engines sync up at regular intervals.
00:53
There are three areas in which the exchange
00:55
between the two engines can happen in info drainage
00:59
at manholes along the banks of open channels
01:03
and along the outline of stormwater controls.
01:07
The overflow can happen in one location,
01:09
while the re entrance of the flooded water can happen in a different location
01:13
depending on whether the flooded water will move on the
01:15
surface after coming out of the one D network,
01:19
there are no limits on how many locations the water can
01:21
be exchanged or how many times the water is exchanged.
01:26
So for example,
01:27
info drainage can be used to represent flooding coming out of an open channel,
01:31
then the flood waters flow on the surface to some
01:34
lower ground where the water is captured by a pond.
01:38
Eventually this pond fills up and floods itself.
01:41
The flood water flows further away following the terrain, slope and features
01:45
and it ends up near a manhole where it is captured and goes into a conduit.
01:51
Note that in this example the open channel
01:53
the pond
01:54
and the manhole did not need to be connected by the same one D. Network.
01:58
They can be connected to different outfalls.
02:02
The computation of the exchange between the one D. Network and the two D. Surface
02:06
accounts for the respective heads at the location of the possible exchange.
02:11
The flow exchanged is calculated using an orifice equation for the
02:15
manholes and a weir equation for the channel banks and pond outline
02:20
for the latter. Due to their linear nature.
02:22
The weir is split into multiple segments,
02:25
accounting for versaces in the two D mesh and
02:28
hydraulic calculations are done on each individual segment.
02:32
The one D two D analysis is typically more
02:35
computational e intensive than the regular one D only analysis
02:39
due to the extra effort of running the two D engine
02:42
and the overhead of the exchange between the two engines.
02:47
The increase in analysis time depends on factors like
02:50
the amount of water in the two D domain,
02:53
the percentage of the two D. Domain that is wet
02:56
and how many locations the water is exchanged between the two engines.
03:01
Lastly,
03:02
it is important to understand that the one D two D
03:05
analysis runs for one phase and one event at a time
00:03
in info drainage. The one D two D. Analysis uses a one D simulation engine
00:08
to calculate the flows in the pipes,
00:10
manholes and other structures below the ground
00:13
in combination with the two D simulation engine
00:16
to predict flood flows across the catchment surface.
00:20
This enables the program to represent the
00:22
overflow from the sewer or channel network,
00:25
the movement of the flooded water on the surface
00:27
and the re entrance of the flooded water back into the sewer or channel network.
00:33
The one D simulation engine and the two D simulation engine runs simultaneously
00:38
during the one D two D analysis,
00:41
in order to enable dynamic coupling between the two engines.
00:45
Each simulation engine runs with its own computational time step
00:49
and the two engines sync up at regular intervals.
00:53
There are three areas in which the exchange
00:55
between the two engines can happen in info drainage
00:59
at manholes along the banks of open channels
01:03
and along the outline of stormwater controls.
01:07
The overflow can happen in one location,
01:09
while the re entrance of the flooded water can happen in a different location
01:13
depending on whether the flooded water will move on the
01:15
surface after coming out of the one D network,
01:19
there are no limits on how many locations the water can
01:21
be exchanged or how many times the water is exchanged.
01:26
So for example,
01:27
info drainage can be used to represent flooding coming out of an open channel,
01:31
then the flood waters flow on the surface to some
01:34
lower ground where the water is captured by a pond.
01:38
Eventually this pond fills up and floods itself.
01:41
The flood water flows further away following the terrain, slope and features
01:45
and it ends up near a manhole where it is captured and goes into a conduit.
01:51
Note that in this example the open channel
01:53
the pond
01:54
and the manhole did not need to be connected by the same one D. Network.
01:58
They can be connected to different outfalls.
02:02
The computation of the exchange between the one D. Network and the two D. Surface
02:06
accounts for the respective heads at the location of the possible exchange.
02:11
The flow exchanged is calculated using an orifice equation for the
02:15
manholes and a weir equation for the channel banks and pond outline
02:20
for the latter. Due to their linear nature.
02:22
The weir is split into multiple segments,
02:25
accounting for versaces in the two D mesh and
02:28
hydraulic calculations are done on each individual segment.
02:32
The one D two D analysis is typically more
02:35
computational e intensive than the regular one D only analysis
02:39
due to the extra effort of running the two D engine
02:42
and the overhead of the exchange between the two engines.
02:47
The increase in analysis time depends on factors like
02:50
the amount of water in the two D domain,
02:53
the percentage of the two D. Domain that is wet
02:56
and how many locations the water is exchanged between the two engines.
03:01
Lastly,
03:02
it is important to understand that the one D two D
03:05
analysis runs for one phase and one event at a time
In InfoDrainage, the 1D - 2D Analysis uses a 1D simulation engine to calculate the flows in the pipes, manholes, and other structures below the ground in combination with a 2D simulation engine to predict flood flows across the catchment surface. This enables the program to represent the overflow from the sewer or channel network; the movement of the flooded water on the surface; and the re-entrance of the flooded water back into the sewer or channel network.
The 1D - 2D Analysis uses, in combination:
Three areas in which the exchange between the two engines can happen:
There are no limits on how many locations the water can be exchanged, or how many times the water is exchanged.
Note that in this example, the open channel, the pond, and the manhole do not need to be connected by the same 1D network; they can be connected to different outfalls.
The computation of the exchange between the 1D network and the 2D surface accounts for the respective heads at the location of the possible exchange. The flow exchanged is calculated using an orifice equation for the manholes, and a weir equation for the channel banks and pond outline.
The 1D - 2D Analysis is more computationally intensive than the 1D-only Analysis, due to the extra effort of running the 2D engine and the overhead of the exchange between the two engines.
Increase in analysis time depends on factors like:
