Guillaume: 1 revision

2008-12-03T10:27:16Z

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193.136.128.7 at 18:29, 28 June 2007

2007-06-28T18:29:15Z

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NOTE: This article has been discontinued and is no longer maintained.

This is the log of the current best-practice methodology for setting up hydrodynamic nested models.

== Build the General Data ==
=== Bathymetries ===

*'''[[Grid]]''': First of all, define your domain(s) and build the grid(s). We use [[Mohid GIS]] for that matter. For nested models, remember to keep a maximum downscaling factor ratio of ''1:3''. In the end, you should have a bunch of [[Grid|''.grd'']] files.

*'''Baseline data''': Next, you need to define/obtain your baseline topographic/bathymetric data as well as your landline data. For example, in regional oceanography, one could choose the ETOPO or GEBCO datasets (available in intranet at ''\\kepler\DataCenter\DadosBase\Oceanografia\Batimetria'') for the bathymetry.

*'''[[ConvertToXYZ]]''': However, before interpolation of the datasets to your grid, you need to convert the dataset into a readable file for [[Mohid GIS]]. [[ConvertToXYZ]] is a little program used for that effect. It will create a [[XYZ points| ''.xyz'']] file.

*'''[[Digital Terrain Creator]]''': Create land line and save it as a [[Polygons|''.xy'']] file. Interpolate the bathymetry data [[XYZ points| ''.xyz'']] file to your grid by using the [[Digital Terrain Creator]] software.

*'''[[SmoothBatimNesting]]''': Optionally, if you created a son grid, then you'll want to smooth it near the boundaries relatively to the father grid. We use the [[SmoothBatimNesting]] software for that matter.

*'''Retouch''' manually the bathymetry [[Grid Data|''.dat'']] file(s) under [[Mohid GIS]] in order to remove all awkward looking cells, as they tend to be a nuisance for stability issues later on.

That's it, your bathymetries should be ready to go!

=== Tidal gauges ===
To simulate tide, [[MOHID]] generates the tide water level at the boundaries by interpolation of
predicted levels between points defined near the open boundaries of the domain. The predicted levels are calculated by the [[TidePrev]] software embedded in [[MOHID]]. [[TidePrev]] calculates the water level from the tidal harmonic components. The harmonic components are given by the [[Fes95]] or the [[Fes2004]] solution, and tidal gauges can be extracted for points near the boundary. Thus [[MOHID]] requires the tidal gauges. The tidal gauges are obtained by the [[Fes95]] or [[Fes2004]] software. The input for the [[Fes2004]] software is an [[XYZ points| ''.xyz'']] file.

=== Initial S and T fields ===
S and T fields are waterproperties. Mohid allows several ways to initialize S and T.
*PROFILE
*LAYERS
*ASCII_FILE
*etc...
You should refer to [[waterproperties.dat]] to learn how to initialize S and T.

[[Category:MOHID Water]]

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193.136.128.7 at 18:29, 28 June 2007