MOHID Course
description
Transcript of MOHID Course
MOHID Course
Lesson 2How To Create a MOHID Project
19 Março 2013
Content
MOHID Standards– Data files, keywords, How to build a timeserie
How to build a simulation?– Bathymetry– Boundary conditions
Tide River Inputs Meteorology
– Initial Conditions Hydrodynamics Properties
Types of files
• ASCII files• Plain text files• Platform independency assured
• HDF files• Hierarchical Data Format (http://hdf.ncsa.uiuc.edu/HDF5/)• High volume of data • Platform independent
• Others• netcdf files• binary unformatted files
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ASCII files syntax
• Options and values are given by Keywords
• Advanced options can be organized in Blocks of information containing a group of keywords
•Each line contains only one instruction
• Files can have blank lines and keywords don’t have to follow any specific order
• All the reading (keywords, keyword values, blocks definition tags) is case sensitive
ASCII files organization - Keywords
• Options and values are given by Keywords
• A keyword is always defined on the left of a delimiter :
• Between the keyword and the delimiter and between the delimiter and the value, blank spaces are allowed
• Keep your data files aligned for easy reading
ASCII files organization - Keywords
Keywords can define:
Type Example of keyword
Value Description
Real numbers DT 30 Model time step (seconds)
Integer numbers DENSITY_METHOD 2 Method to compute water density
Boolean values TIDE 1 Activate/Deactivate tide
Character string NAME temperature Name of a water property
Real/Integer array BOXES_VALUES 3.4 4.5 2.1 5.3 Values atributed to each box
Dates START 2006 9 26 15 0 0 Mohid Time Format
Time and Date format
START : 2013 03 19 17 0 0
Keyword Year Month Day Hour Minute Second
Time and dates in MOHID are set by a keyword with an array of integer numbers
Today’s date March 19th, 2008 at 17h00
ASCII files organization - Blocks
• Files are organized in Blocks of information
• Blocks define advanced options through the combination of groups of keywords
• Each block is delimited by a “begin block tag” and an “end block tag” using “<“ and “>”
• A block can also be defined inside another block
<beginproperty>
….
<endproperty>
Space and Time Variation of spatial input Data
– Constant Same value in Space and Time
– TimeSerie Changes with time but all cells have the same value
– HDF Changes in time and Space
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Construct a timeserie (e.g. Discharge)
SERIE_INITIAL_DATA : 2013 3 18 0 0 0TIME_UNITS : DAYS
Days Flow(m3/s) <BeginTimeSerie>0 11 102 1003 104 1<EndTimeSerie>
Under the Hood
MOHID Studio Explorer
Output Files
Input Files
Under the Hood
Input files do not have/solve equations Input files have equations parameters Input files have options to run Input files have the forcing that change with time Input files have the conditions at the sart
Mohid.exe
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mu - prey mortality
Run Adection/Diffusion and what methods (upwind, central differences)
River discharge, Tide, Meteorology
Initial Conditions
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Input Files
Reads Input
Writes Output
Bathymetry
Is the 2D depth and bottom boundary It defines the horizontal grid
Hydrographic zero
Geometry Data File
<begindomain> ID : 1 TYPE : SIGMA LAYERS : 1 LAYERTHICKNESS : 1.0 TOLERANCEDEPTH : 0.0500 DOMAINDEPTH : -99.00 MININITIALLAYERTHICKNESS : 0.05 <enddomain>
Horizontal Grid
Bathymetry
Vertical Geometry
Atmosphere Data File
<beginproperty> NAME : air temperature UNITS : ºC DESCRIPTION : Temperature FILE_IN_TIME : NONE
DEFAULTVALUE : 20. REMAIN_CONSTANT : 1 TIME_SERIE : 0 OUTPUT_HDF : 1 <endproperty>
<beginproperty> NAME : air temperature UNITS : ºC DESCRIPTION : Temperature FILE_IN_TIME : TIMESERIE FILENAME : ..\General Data\Atmosphere\AtmosphereData.dat DATA_COLUMN : 5 DEFAULTVALUE : 20. REMAIN_CONSTANT : 0 TIME_SERIE : 0 OUTPUT_HDF : 1 <endproperty>
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Boundary Conditions
Discharges Data File
<begindischarge> NAME : Tagus DESCRIPTION : Enter a short description I_CELL : 107 J_CELL : 149 K_CELL : 1 DEFAULT_FLOW_VALUE : 20.0
<enddischarge>
CONSTANTTIMESERIE <begindischarge> NAME : Tagus DESCRIPTION : Enter a short description I_CELL : 107 J_CELL : 149 K_CELL : 1 DEFAULT_FLOW_VALUE : 20.0 DATA_BASE_FILE : ..\General Data\Boundary
Conditions\DichargeExample.srd FLOW_COLUMN : 2 <enddischarge>
Boundary Conditions
Hydrodynamics Data File
CORIOLIS : 1 TIDE : 1 WATER_DISCHARGES : 1 WIND : 1
Other options compute advection diffusion, explicit, implicit. If not defined will have default values
!INITIAL_ELEVATION : 0 !INITIAL_ELEVATION_VALUE : 0
Initial Conditions
Model Data File
START : 2013 3 18 12 0 0 END : 2013 3 19 0 0 0 VARIABLEDT : 1 DT : 15. MAXDT : 60.
Water Properties File
<beginproperty> NAME : temperature UNITS : ºC DESCRIPTION : No description was given. INITIALIZATION_METHOD : CONSTANT DEFAULTVALUE : 20 ADVECTION_DIFFUSION : 1 SURFACE_FLUXES : 1 DISCHARGES : 1 OUTPUT_HDF : 1 TIME_SERIE : 1 <endproperty>
Initial Conditions
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How to Build a MOHID Run
Bathymetry (Ex. 1) Boundary Conditions (Ex. 2)
– Meteorology– Discharge– Tide (automatic since it can be predicted
astronomically)
Initial Conditions (Ex. 3)
Ex.1 Create Bathymetry
Bathymetry– Map -> Ascii -> XYZ points - Open the bathymetric data in Digital Terrain\
BathymetryData – Create the model Horizontal Grid in Tools -> Grids-> Constant
Pick a origin – select origin close to data origin Click Auto-Update Leave number of cells 100x100 Define the dx (x spacing) as 0.008º (~800m) Define the dy (y spacing) as 0.006º (~600m) Save the grid in Digital Terrain\Grids\ and give name (e.g. TagusGrid)
– Map -> Ascii -> Polygon - Open the polygon Coast line in Digital Terrain\CoastLine. This is the land and no compute points!
– Create the Bathymetry – Tools -> Grid Data Tools -> From Points Verify the grid selected is the one created Select Coast line as non compute points Verify if Point data is selected Interpolate: Average Save the bathymetry in Digital Terrain and pick a name (e.g. Tagus_Average) Click Process
– Do the same as previous but now with Interpolate: Triangulation and save with different name (e.g. Tagus_Triang)
– See where bathymetry is refered to the model
Ex.1 Create Bathymetry
Ex 2. Define Boundary Conditions
Constant– In the reference simulation (Run 1) check where
constant discharge and meteorology properties are defined
Dicharge - DEFAULT_FLOW_VALUE and no file used Meteorology - FILE_IN_TIME : NONE
DEFAULTVALUE : X.
REMAIN_CONSTANT : 1
Ex 2. Define Boundary Conditions
Time Serie– Select the project, create a new run (Project -> New
Simulation) and name it (e.g. Tide_TagusTimeSerie_MeteoTimeSerie)
– Copy the data files from the run 1 (Project -> Copy Simulation) – Edit the discharge and uncomment the DATA_BASE_FILE and
FLOW_COLUMN. Check the file that will be used and open it.– Create a meteorology timeseries in Boundary Conditions\
Meteorology and edit the Meteorology file to read it– Run the simulation. The model will use now timeseries for flow
and for meteotology as real data
Ex 3. Initial Conditions
In the reference simulation (Run 1) check the initial conditions:– Hydrodynamics
INITIALIZATION_ELEVATION : 1– Define Level with INITIALIZATION_ELEVATION_VALUE
INITIALIZATION_ELEVATION : 0– Defined by the OpenBoundary - Tide
– Water Properties INITIALIZATION_METHOD : CONSTANT DEFAULTVALUE : X.
Ex 3. Initial Conditions
Create a new simulation similar as Run1 and create a continuation that will continue after it – Select Run and Project -> New Run and name it
Check that CONTINUOUS : 1 is present in Hydrodynamics
Add OLD : 1 in every property of Water Properties and change it to 1 in Langragian Origin
Change End Date. Verify that Start Date is same and end Date of the previous.
This run will have the initial conditions as the last instant of the previous.
Recall
MOHID formats and keywords Space Inputs may be constant, time-variant
(Timeseries) and time and space variant (HDF) Discharges may be defined by constant or timeserie Created Bathymetry from point data Checked Boundary conditions and changed forcing
to timeserie (more realistic) in discharge and meteorology
Checked Initial conditions and created continuous simulation reading initial conditions from previous
Next Lesson
Continue Unfinished examples Free time to testing and doubts
Links
Página principal do sistema MOHIDhttp://www.mohid.com/
MOHID Wikipédia: http://wiki.mohid.com/wiki
Fórum de discussão MOHIDhttp://www.mohid.com/forum/