Hi everyone, this is the second video for
channel and floodplain 2D modeling with HEC-RAS. In this video, I will
add boundary condition lines to the previously developed 2D mesh and
check all the developed geometries using geometric editor. After that, I will
connect flow data with unsteady flow editor. So, let's get started for editing
boundary conditions using RAS mapper. So, very firstly you need go to this
boundary condition and then expand its boundary condition group, then you can
check this the boundary condition lines. After that, click this boundary condition
lines and then right-click to press this edit geometry button. And then, now you can
create any boundary conditions on here, so very firstly, I will make inflow part
for this upstream of the river. So... in here I will start to make the boundary
condition and then double click, you can find it, you need to enter the boundary
condition name on here. So, I will use this the boundary condition with the
inflow okay, then click OK. Now we developed this inflow boundary condition okay, so
here is very important message for you this boundary condition must not
intersect this the developed perimeter of the mesh, okay. So in this
case, I just create near this mesh with my newly created boundary condition line
okay. And then, let's make on here the tributary boundary condition, so I will make
another one double click, and then I will make this name of the
Marsh Creek okay, just click OK. And then need to zoom in on here part, and then
you can also make the boundary condition name of the Beech Creek, b e e c h creek,
then just click OK. And then, another one should be in here, so in this point I
would like to make another boundary condition line on here. After that, you
need to insert with this name of the Fishing Creek okay, just click OK.
So, now we developed one inflow boundary condition and three boundary conditions
for these three tributary okay, and then very lastly, you need to make another
boundary condition for this downstream of the rivers okay, so double click and
then just give downstream, OK. Now we just developed this boundary
condition lines okay, so we need to stop to save this boundary condition and yes. After that, one more save with this file
save, okay. So, now I will close this RAS mapper and then go to this RAS main
platform with this edit geometric data, after that you need to open just
developed the geometric data on here with this geometric data window. So, file and open
geometry data and then you can find this box to import this
geometric data, okay. So, just click OK. So, now you can see this
developed geometric data with 2D area mesh and these boundary
conditions for the... give the initial flow conditions for this river, okay. And then,
how about to see this inflow boundary condition details, so just zoom
in... this point and then it is just associated with these 2D mesh and
boundary condition this BC line, okay. Inflow, and Marsh Creek, and Beech Creek, and
Fishing Creek as well as this lastly the downstream, okay. So, we just need to full
plot then, we just checked it is the developed geometric data, after that
go to this file and just save with geometric data, okay. And then just close
this one. Now I will open unsteady flow editor, so you can have two options to
click this button view and edit unsteady flow data or edit to click this unsteady
flow data, okay. And then you can find this editor for unsteady flow, okay.
So, very firstly click this downstream boundary condition line okay, and then you can
find these options are activated. So, in this case for the downstream boundary
condition, we will give just normal depth, okay. Just click and bring this box and
then just type the slope, friction slope with 0.001,
okay, just click OK. After that, I will give the very firstly for the inflow
things, so in this case also these the options are activated in here, I will
give actual flow data, unsteady flow data hydrograph. So, just click this flow
hydrograph and then we need to bring some the data. Actually, this HEC-series
use this kind of DSS file to store all the data required, this is very unique
type for this HEC software, okay. So just... because we already prepared the DSS
file, we just need bring that kind of developed DSS file, okay. Just click
select file and path, and then you can find this one - pick DSS path. And then,
open this window, then you need to find the temp under, HEC-RAS 2D
folder under, this flow data. So, this is DSS file, just double click and then... since we
should selected for the inflow part flow hydrograph, so you can
find these the part B, you can find some the name of the flows. So, we should click
this dam inflow, this would be inflow of the this our developed river a system for
the upstream, okay. So, here are two scenarios for the inflow, in this case I
just use this one 1998 case, okay. Just double click and then you can find this
one is selected, then just click OK. Now we have this flow hydrograph for this
inflow boundary condition, okay. After that, you need one more thing for this
slope, EG slope for distributing flow along boundary conditions, okay. So, we just
use the same number of the downstream the boundary condition 0.001 in this
case. How about press this plot data button, so you can see this is hydrograph,
flow hydrograph. These would be two days hydrograph from this high amount
of the flow to low amount, okay. You can check with this plot data button, okay. So,
just click OK, so now we edit this flow hydrograph for this BC line for
inflow, then also you need to hydrograph for Marsh Creek, okay. So, same way to
select the DSS file and Marsh Creek, okay. So, 1998 case you can find this one
and just click OK, then here is same same one, 0.001.
How about plot data, so different amount for the tributaries, okay. Tributary
river and then just click okay, so after that, Beech Creek,
so flow hydrograph select, then DSS file, Beech Creek, 1998
scenario, and double click, after that just click OK, okay.
Lastly, Fishing Creek hydrograph, flow hydrograph, DSS file, then Fishing
Creek on here, so 1998 scenario, so click OK, 0.001,
okay. How about plot data, so same way some small amount relative inflow, upstream
inflow data, okay. Just click OK, so now we all edits required the boundary
conditions with flow and normal depth for the slope, okay. So, you need to go to file
and save unsteady flow data, and then you need to save this flow data on
the same directory folder. I mean, the C:// under, temp under, HEC-RAS 2D flow,
okay. So in here, I will use the name of the flow title with the flows just
okay, then just click OK. Now we are ready to use this flow data for our unsteady
flow simulation. So, this was part 2 video and I will continue 2D
unsteady flow simulation work with the following video using unsteady flow
analysis editor. And also check the results with RAS
mapper. Thank you for watching!
