[Example 4] Flow in a real river（single cross section)
============================================================================

----------------
Select Solver
----------------

In the [Select Solver] window, :numref:`04_koshi_1` , select [Nays2d+] and click [OK].

.. _04_koshi_1:

.. figure:: images/04/koshi_1.png
   :width: 100%

   : Select Solver

-----------------------------------------
Importing River Survey Data
-----------------------------------------

In the window, :numref:`04_koshi_2`, select [Import], [Geographic Data], [Elevation(m)]

.. _04_koshi_2:

.. figure:: images/04/koshi_2.png
   :width: 100%

   : Import river geographic data
   
   

Chose [single.riv] in the window, :numref:`04_koshi_3` and open.
The cross sectional survey data "single.riv" can be downloaded from，
https://i-ric.org/yasu/fw/rivfiles/single.riv 

.. _04_koshi_3:

.. figure:: images/04/koshi_3.png
   :width: 100%

   : Select File


A message window may appear telling "Problems Fund i Data" as 
:numref:`04_koshi_4` ,but just click [OK]

.. _04_koshi_4:

.. figure:: images/04/koshi_4.png
   :width: 100%

   : Prblem Fund

Select [Middle point of left and right bank] in the 
[River Survey Data Import Setting] window as :numref:`04_koshi_5` ,
and click [OK]

.. _04_koshi_5:

.. figure:: images/04/koshi_5.png
   :width: 100%

   : River Survay Data Import Setting



:numref:`04_koshi_6` riv file import complete.

.. _04_koshi_6:

.. figure:: images/04/koshi_6.png
   :width: 100%

   : Import Complete


-----------------------------
Grid Generation Conditions
-----------------------------

From the main menu, select [Grid] and [Select Algorithm to Create Grid] as, 
:numref:`04_koshi_7` 

.. _04_koshi_7:

.. figure:: images/04/koshi_7.png
   :width: 100%

   : Select Algorithm to Create Grid


Select [Create grid from river survey data] from the window, :numref:`04_koshi_8` ,
and click [OK].

.. _04_koshi_8:

.. figure:: images/04/koshi_8.png
   :width: 100%

   : Create grid from river survey data

As shown in :numref:`04_koshi_9` , a channel with cross sections with both ends' 
blue circles are displayed.

.. _04_koshi_9:

.. figure:: images/04/koshi_9.png
   :width: 100%

   : Setting Grid Create Condition Complete

-------------------------
Grid Generation
-------------------------

Select any side of one of the cross section line, right click, and chose
[Add Division Points].


.. _04_koshi_10:

.. figure:: images/04/koshi_10.png
   :width: 100%

   :Add Division Points(1)


Set [Division Number], set [4] in this example, and
click [OK] (:numref:`04_koshi_11` )

.. _04_koshi_11:

.. figure:: images/04/koshi_11.png
   :width: 60%

   :Add Division Points(2)

Select one of the opposite side of the cross sectional line we 
selected in :numref:`04_koshi_10` , right click, and chose
[Add Division Points] (:numref:`04_koshi_12` )

.. _04_koshi_12:

.. figure:: images/04/koshi_12.png
   :width: 100%

   :Add Division Points(3)

Set [Division Number], set [4] as a same number we set in 
:numref:`04_koshi_11` for the symmetry.

.. _04_koshi_13:

.. figure:: images/04/koshi_13.png
   :width: 60%

   :Add Division Points(4)


Along the channel direction, division points are set all at once.
Select [Grid], [Add Division Points Regionally] from the menu bar.
( :numref:`04_koshi_14` )

.. _04_koshi_14:

.. figure:: images/04/koshi_14.png
   :width: 100%

   :Add Division Points Regionally(1)

Chose [Specify target distance division points]. set distance [70] in this example,
and click [OK]．( :numref:`04_koshi_15` )


.. _04_koshi_15:

.. figure:: images/04/koshi_15.png
   :width: 60%

   :Add Division Points Regionally(2)


When the setup for division points are completed, 
a plane map with yellow circle points appears as
:numref:`04_koshi_16`

.. _04_koshi_16:

.. figure:: images/04/koshi_16.png
   :width: 100%

   :Set dicision points complete


Select [Grid], [Grid Create] from the menu bar.( :numref:`04_koshi_17` )

.. _04_koshi_17:

.. figure:: images/04/koshi_17.png
   :width: 100%

   :Grid Create(1)


Confirm the grid generation range painted with blue, and 
click [OK].

.. _04_koshi_18:

.. figure:: images/04/koshi_18.png
   :width: 60%

   :Grid Create(2)

Answer [Yes] when you asked [Do you want to map?] as
:numref:`04_koshi_19` 

.. _04_koshi_19:

.. figure:: images/04/koshi_19.png
   :width: 60%

   :Mapping?

Completed grid is shown as :numref:`04_koshi_20` 

.. _04_koshi_20:

.. figure:: images/04/koshi_20.png
   :width: 100%

   :Grid Generation Complete

Bed configuration and channel shape can be confirmed by putting checking marks at, 
[Grid], [Node attributes] and [Elevation (m)].
( :numref:`04_koshi_21` )

.. _04_koshi_21:

.. figure:: images/04/koshi_21.png
   :width: 100%

   :Confirmtion of the Mapping Result

------------------------
Computational Condition
------------------------

Select [Calculation Condition] and [Setting] from the min menu as
:numref:`04_joken_01` .

.. _04_joken_01:

.. figure:: images/04/joken_01.png
   :width: 100%

   :Setting Compitational Condition

Set [Time unit of discharge] as [Hour] and click [Edit], 
( :numref:`04_joken_02` )

.. _04_joken_02:

.. figure:: images/04/joken_02.png
   :width: 100%

   :Discharge Condition


Set discharge hydrography as :numref:`04_joken_03`, constant for 3 hours 
with 2,000 qms, and click [OK].

.. _04_joken_03:

.. figure:: images/04/joken_03.png
   :width: 100%

   :Input Discharge(2)

Set [Time and bed erosion condition] as :numref:`04_joken_04` .

.. _04_joken_04:

.. figure:: images/04/joken_04.png
   :width: 100%

   :Time and bed erosion condition

Set [Boundary Conditions] as :numref:`04_joken_05` .

.. _04_joken_05:

.. figure:: images/04/joken_05.png
   :width: 100%

   :Boundary Conditions

Set [Initial Water Surface Profile] as :numref:`04_joken_06` .

.. _04_joken_06:

.. figure:: images/04/joken_06.png
   :width: 100%

   :Initial Water Surface Profile 

Set [Other computational parameters] as :numref:`04_joken_07` .

.. _04_joken_07:

.. figure:: images/04/joken_07.png
   :width: 100%

   :Other computational parameters

Set "3D Velocity Profile" as shown in the figure :numref:`04_joken_08` ,
and click [OK] to exit.

.. _04_joken_08:

.. figure:: images/04/joken_08.png
   :width: 100%

   :3D Velocity Profile Settings

--------------------
Launch Computation
--------------------

From the menu bar, select [Simulation] and [Run].

.. _04_jikko_01:

.. figure:: images/04/jikko_01.png
   :width: 100%

   :Launch Simulation(1)

Answer [Yes(Y)] when you asked [Save the project？] as
:numref:`04_jikko_02` 


.. _04_jikko_02:

.. figure:: images/04/jikko_02.png
   :width: 60%

   :Launch Simulation(2)


Simulation starts. :numref:`04_jikko_03` 

.. _04_jikko_03:

.. figure:: images/04/jikko_03.png
   :width: 100%

   :Launch Simulation(3)


Click [OK] when the message [The solver finished calculation] as
:numref:`04_jikko_04` 

.. _04_jikko_04:

.. figure:: images/04/jikko_04.png
   :width: 60%

   :Calculation finished

-------------------------------
Display Computational Results
-------------------------------

After the companion finished, form the main menu, 
by selecting [Calculation Results] and 
[Open new 2D Post-Processing Window], 
a new Window appears as :numref:`04_kekka_01` .

.. _04_kekka_01:

.. figure:: images/04/kekka_01.png
   :width: 100%

   :2D Post-Process Window



^^^^^^^^^^^
Depth
^^^^^^^^^^^
n the object browser, put the check marks in "Scalar (node)" and "Depth[m]",
right-click and select "Properties". 
The "Scalar Setting" window :numref:`04_kekka_04` appears.

.. _04_kekka_04:

.. figure:: images/04/kekka_04.png
   :width: 100%

   :Scalar Setting
 
Set the values as shown in :numref:`04_kekka_04`, and click [OK], 
then :numref:`04_kekka_05`
appears.

.. _04_kekka_05:

.. figure:: images/04/kekka_05.png
   :width: 100%

   : Depth Plot


^^^^^^^^^^^^^^^^^^^^^^^^^^
Display Background Image
^^^^^^^^^^^^^^^^^^^^^^^^^^

Select from the main menu, [File]->[Property]
( :numref:`04_haikei_01` )

.. _04_haikei_01:

.. figure:: images/04/haikei_01.png
   :width: 100%

   :Select Property


From the "Project Property" window, click 
[Edit] at [Coordinate System] 
.. _04_haikei_02:

.. figure:: images/04/haikei_02.png
   :width: 100%

   :Edit Coordinate System Setting

Input "Japan" in the [Search] window, and chose the one with "XII"
from the items with [EPSG:....] as :numref:`04_haikei_03` .
See more detail on coordinate system of Japan at
http://www.gsi.go.jp/sokuchikijun/jpc.html 

.. _04_haikei_03:

.. figure:: images/04/haikei_03.png
   :width: 100%

   :Select Coordinate System

Click [Close] of [Project Property] window of :numref:`04_haikei_04` 

.. _04_haikei_04:

.. figure:: images/04/haikei_04.png
   :width: 100%

   :Close Property Window


Put a check mark in a box in front of [Background Images(Internet)] and
one of the items listed below, e.g., [Google Map (Sattelite Image)]
as :numref:`04_haikei_05`

.. _04_haikei_05:

.. figure:: images/04/haikei_05.png
   :width: 100%

   :Background Image Import Complete


^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Velocity Vectors and Streamlines
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Since the operation method is the same as the previous section, 
it will be omitted.

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Particle Animations
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Put check mark at [Particles] and [Velocity] in the object browser,
put time bar back to zero, and push black button, 
( :numref:`04_particle_01` ). 
Particle following the depth averaged velocity starts as 
:numref:`04_particle_02` ．

.. _04_particle_01:

.. figure:: images/04/particle_01.png
   :width: 100%

   :Particle Animation


.. _04_particle_02:

.. figure:: images/04/particle_02.gif
   :width: 100%

   :Particle movement by depth averaged velocity

Make the Particles riding the surface velocity are displayed in red.
Put ☑ in "Particle" and "SurfaceVelocity", right-click on "Particle" and select "Properties" to display "Particle setting screen" :numref:`04_particle_03`, so set it as shown in the figure and Click [OK].
Reset the time bar to zero and press the play button to display the particle animation caused by the surface flow of :numref:`04_particle_04`.

.. _04_particle_03:

.. figure:: images/04/particle_03.png
   :width: 60%

   :Particle Setting


.. _04_particle_04:

.. figure:: images/04/particle_04.gif
   :width: 100%

   :Particle movement by surface velocity

In the same way, the particle flowing animations can be played by 
checking a box at [Bottom Velocity], respectively.

.. _04_particle_05:

.. figure:: images/04/particle_05.gif
   :width: 100%

   :Particle movement by bottom velocity