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Input Grids

Input grids (INPGRID) define the spatial grids for external forcing data such as bathymetry, wind, currents, water level, and friction. Each input grid can have different resolution and extent from the computational grid.

Input Grid Types

  • BOTTOM — Bathymetry (water depth)
  • WIND — Wind velocity components
  • CURRENT — Current velocity components
  • WLEVEL — Water level variations
  • FRICTION — Spatially varying bottom friction
  • ICE — Sea ice coverage

Grid Types

REGULAR

Bases: INPGRID

SWAN regular input grid.

.. code-block:: text

INPGRID [grid_type] REGULAR [xpinp] [ypinp] [alpinp] [mxinp] [myinp] &
    [dxinp] [dyinp] (EXCEPTION [excval]) &
    (NONSTATIONARY [tbeginp] [deltinp] ->SEC|MIN|HR|DAY [tendinp])
READGRID [grid_type] [fac] 'fname1' [idla] [nhedf] ([nhedt]) ([nhedvec]) &
    ->FREE|FORMAT|UNFORMATTED ('form'|[idfm])

This is a group component that includes an INPGRID and a READGRID component.

Examples

.. ipython:: python :okwarning:

from rompy_swan.components.inpgrid import REGULAR
inpgrid = REGULAR(
    grid_type="bottom",
    excval=-99.0,
    xpinp=172.0,
    ypinp=-41.0,
    alpinp=0.0,
    mxinp=99,
    myinp=99,
    dxinp=0.005,
    dyinp=0.005,
    readinp=dict(fname1="bottom.txt"),
)
print(inpgrid.render())
inpgrid = REGULAR(
    grid_type="wind",
    excval=-99.0,
    xpinp=172.0,
    ypinp=-41.0,
    alpinp=0.0,
    mxinp=99,
    myinp=99,
    dxinp=0.005,
    dyinp=0.005,
    readinp=dict(fname1="wind.txt"),
    nonstationary=dict(
        tbeg="2019-01-01T00:00:00",
        tend="2019-01-07 00:00:00",
        delt=3600,
        dfmt="hr",
    ),
)
print(inpgrid.render())

TODO: Use grid object, requires different grid parameters to be allowed.

Source code in src/rompy_swan/components/inpgrid.py 
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class REGULAR(INPGRID):
    """SWAN regular input grid.

    .. code-block:: text

        INPGRID [grid_type] REGULAR [xpinp] [ypinp] [alpinp] [mxinp] [myinp] &
            [dxinp] [dyinp] (EXCEPTION [excval]) &
            (NONSTATIONARY [tbeginp] [deltinp] ->SEC|MIN|HR|DAY [tendinp])
        READGRID [grid_type] [fac] 'fname1' [idla] [nhedf] ([nhedt]) ([nhedvec]) &
            ->FREE|FORMAT|UNFORMATTED ('form'|[idfm])

    This is a group component that includes an `INPGRID` and a `READGRID` component.

    Examples
    --------

    .. ipython:: python
        :okwarning:

        from rompy_swan.components.inpgrid import REGULAR
        inpgrid = REGULAR(
            grid_type="bottom",
            excval=-99.0,
            xpinp=172.0,
            ypinp=-41.0,
            alpinp=0.0,
            mxinp=99,
            myinp=99,
            dxinp=0.005,
            dyinp=0.005,
            readinp=dict(fname1="bottom.txt"),
        )
        print(inpgrid.render())
        inpgrid = REGULAR(
            grid_type="wind",
            excval=-99.0,
            xpinp=172.0,
            ypinp=-41.0,
            alpinp=0.0,
            mxinp=99,
            myinp=99,
            dxinp=0.005,
            dyinp=0.005,
            readinp=dict(fname1="wind.txt"),
            nonstationary=dict(
                tbeg="2019-01-01T00:00:00",
                tend="2019-01-07 00:00:00",
                delt=3600,
                dfmt="hr",
            ),
        )
        print(inpgrid.render())

    TODO: Use grid object, requires different grid parameters to be allowed.

    """

    model_type: Literal["regular", "REGULAR"] = Field(
        default="regular",
        description="Model type discriminator",
    )
    xpinp: float = Field(
        description=(
            "Geographic location (x-coordinate) of the origin of the input grid in "
            "problem coordinates (in m) if Cartesian coordinates are used or in "
            "degrees if spherical coordinates are used. In case of spherical "
            "coordinates there is no default"
        ),
    )
    ypinp: float = Field(
        description=(
            "Geographic location (y-coordinate) of the origin of the input grid in "
            "problem coordinates (in m) if Cartesian coordinates are used or in "
            "degrees if spherical coordinates are used. In case of spherical "
            "coordinates there is no default"
        ),
    )
    alpinp: Optional[float] = Field(
        default=0.0,
        description=(
            "Direction of the positive x-axis of the input grid "
            "(in degrees, Cartesian convention)"
        ),
    )
    mxinp: int = Field(
        description=(
            "Number of meshes in x-direction of the input grid (this number is one "
            "less than the number of grid points in this direction)"
        ),
    )
    myinp: int = Field(
        description=(
            "Number of meshes in y-direction of the input grid (this number is one "
            "less than the number of grid points in this direction). In 1D-mode, "
            "`myinp` should be 0"
        ),
    )
    dxinp: float = Field(
        description=(
            "Mesh size in x-direction of the input grid, in m in case of Cartesian "
            "coordinates or in degrees if spherical coordinates are used"
        ),
    )
    dyinp: float = Field(
        description=(
            "Mesh size in y-direction of the input grid, in m in case of Cartesian "
            "coordinates or in degrees if spherical coordinates are used. "
            "In 1D-mode, `dyinp` may have any value"
        ),
    )

    def cmd(self) -> list:
        repr = (
            f"{super().cmd()} REGULAR xpinp={self.xpinp} ypinp={self.ypinp} "
            f"alpinp={self.alpinp} mxinp={self.mxinp} myinp={self.myinp} "
            f"dxinp={self.dxinp} dyinp={self.dyinp}"
        )
        if self.excval is not None:
            repr += f" EXCEPTION excval={self.excval}"
        if self.nonstationary is not None:
            repr += f" {self.nonstationary.render()}"
        repr = [repr] + [self.readinp.render()]
        return repr

Attributes

model_type class-attribute instance-attribute 

model_type: Literal['regular', 'REGULAR'] = Field(default='regular', description='Model type discriminator')

xpinp class-attribute instance-attribute 

xpinp: float = Field(description='Geographic location (x-coordinate) of the origin of the input grid in problem coordinates (in m) if Cartesian coordinates are used or in degrees if spherical coordinates are used. In case of spherical coordinates there is no default')

ypinp class-attribute instance-attribute 

ypinp: float = Field(description='Geographic location (y-coordinate) of the origin of the input grid in problem coordinates (in m) if Cartesian coordinates are used or in degrees if spherical coordinates are used. In case of spherical coordinates there is no default')

alpinp class-attribute instance-attribute 

alpinp: Optional[float] = Field(default=0.0, description='Direction of the positive x-axis of the input grid (in degrees, Cartesian convention)')

mxinp class-attribute instance-attribute 

mxinp: int = Field(description='Number of meshes in x-direction of the input grid (this number is one less than the number of grid points in this direction)')

myinp class-attribute instance-attribute 

myinp: int = Field(description='Number of meshes in y-direction of the input grid (this number is one less than the number of grid points in this direction). In 1D-mode, `myinp` should be 0')

dxinp class-attribute instance-attribute 

dxinp: float = Field(description='Mesh size in x-direction of the input grid, in m in case of Cartesian coordinates or in degrees if spherical coordinates are used')

dyinp class-attribute instance-attribute 

dyinp: float = Field(description='Mesh size in y-direction of the input grid, in m in case of Cartesian coordinates or in degrees if spherical coordinates are used. In 1D-mode, `dyinp` may have any value')

Functions

cmd 

cmd() -> list
Source code in src/rompy_swan/components/inpgrid.py 
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def cmd(self) -> list:
    repr = (
        f"{super().cmd()} REGULAR xpinp={self.xpinp} ypinp={self.ypinp} "
        f"alpinp={self.alpinp} mxinp={self.mxinp} myinp={self.myinp} "
        f"dxinp={self.dxinp} dyinp={self.dyinp}"
    )
    if self.excval is not None:
        repr += f" EXCEPTION excval={self.excval}"
    if self.nonstationary is not None:
        repr += f" {self.nonstationary.render()}"
    repr = [repr] + [self.readinp.render()]
    return repr

CURVILINEAR

Bases: INPGRID

SWAN curvilinear input grid.

.. code-block:: text

INPGRID [grid_type] CURVILINEAR [stagrx] [stagry] [mxinp] [myinp] &
    (EXCEPTION [excval]) &
    (NONSTATIONARY [tbeginp] [deltinp] ->SEC|MIN|HR|DAY [tendinp])
READGRID [grid_type] [fac] 'fname1' [idla] [nhedf] ([nhedt]) ([nhedvec]) &
    ->FREE|FORMAT|UNFORMATTED ('form'|[idfm])

This is a group component that includes an INPGRID and a READGRID component.

Examples

.. ipython:: python :okwarning:

from rompy_swan.components.inpgrid import CURVILINEAR
inpgrid = CURVILINEAR(
    grid_type="wind",
    stagrx=0.0,
    stagry=0.0,
    mxinp=199,
    myinp=199,
    excval=-99.0,
    readinp=dict(fname1="wind.txt"),
    nonstationary=dict(
        tbeg="2019-01-01T00:00:00",
        tend="2019-01-07 00:00:00",
        delt=3600,
        dfmt="hr",
    ),
)
print(inpgrid.render())

TODO: Handle (or not) setting default values for mxinp and myinp from cgrid.

Source code in src/rompy_swan/components/inpgrid.py 
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class CURVILINEAR(INPGRID):
    """SWAN curvilinear input grid.

    .. code-block:: text

        INPGRID [grid_type] CURVILINEAR [stagrx] [stagry] [mxinp] [myinp] &
            (EXCEPTION [excval]) &
            (NONSTATIONARY [tbeginp] [deltinp] ->SEC|MIN|HR|DAY [tendinp])
        READGRID [grid_type] [fac] 'fname1' [idla] [nhedf] ([nhedt]) ([nhedvec]) &
            ->FREE|FORMAT|UNFORMATTED ('form'|[idfm])

    This is a group component that includes an `INPGRID` and a `READGRID` component.

    Examples
    --------

    .. ipython:: python
        :okwarning:

        from rompy_swan.components.inpgrid import CURVILINEAR
        inpgrid = CURVILINEAR(
            grid_type="wind",
            stagrx=0.0,
            stagry=0.0,
            mxinp=199,
            myinp=199,
            excval=-99.0,
            readinp=dict(fname1="wind.txt"),
            nonstationary=dict(
                tbeg="2019-01-01T00:00:00",
                tend="2019-01-07 00:00:00",
                delt=3600,
                dfmt="hr",
            ),
        )
        print(inpgrid.render())

    TODO: Handle (or not) setting default values for mxinp and myinp from cgrid.

    """

    model_type: Literal["curvilinear", "CURVILINEAR"] = Field(
        default="curvilinear", description="Model type discriminator"
    )
    stagrx: float = Field(
        default=0.0,
        description=(
            "Staggered x'-direction with respect to computational grid, e.g., "
            "`stagrx=0.5` means that the input grid points are shifted a half step "
            "in x'-direction; in many flow models x-velocities are defined in points "
            "shifted a half step in x'-direction"
        ),
    )
    stagry: float = Field(
        default=0.0,
        description=(
            "Staggered y'-direction with respect to computational grid, e.g., "
            "`stagry=0.5` means that the input grid points are shifted a half step "
            "in y'-direction; in many flow models y-velocities are defined in points "
            "shifted a half step in y'-direction"
        ),
    )
    mxinp: int = Field(
        description=(
            "Number of meshes in ξ-direction of the input grid (this number is one "
            "less than the number of grid points in this direction)"
        ),
    )
    myinp: int = Field(
        description=(
            "Number of meshes in η-direction of the input grid (this number is one "
            "less than the number of grid points in this direction)"
        ),
    )

    def cmd(self) -> str:
        repr = (
            f"{super().cmd()} CURVILINEAR stagrx={self.stagrx} "
            f"stagry={self.stagry} mxinp={self.mxinp} myinp={self.myinp} "
        )
        if self.excval is not None:
            repr += f" EXCEPTION excval={self.excval}"
        if self.nonstationary is not None:
            repr += f" {self.nonstationary.render()}"
        repr = [repr] + [self.readinp.render()]
        return repr

Attributes

model_type class-attribute instance-attribute 

model_type: Literal['curvilinear', 'CURVILINEAR'] = Field(default='curvilinear', description='Model type discriminator')

stagrx class-attribute instance-attribute 

stagrx: float = Field(default=0.0, description="Staggered x'-direction with respect to computational grid, e.g., `stagrx=0.5` means that the input grid points are shifted a half step in x'-direction; in many flow models x-velocities are defined in points shifted a half step in x'-direction")

stagry class-attribute instance-attribute 

stagry: float = Field(default=0.0, description="Staggered y'-direction with respect to computational grid, e.g., `stagry=0.5` means that the input grid points are shifted a half step in y'-direction; in many flow models y-velocities are defined in points shifted a half step in y'-direction")

mxinp class-attribute instance-attribute 

mxinp: int = Field(description='Number of meshes in ξ-direction of the input grid (this number is one less than the number of grid points in this direction)')

myinp class-attribute instance-attribute 

myinp: int = Field(description='Number of meshes in η-direction of the input grid (this number is one less than the number of grid points in this direction)')

Functions

cmd 

cmd() -> str
Source code in src/rompy_swan/components/inpgrid.py 
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def cmd(self) -> str:
    repr = (
        f"{super().cmd()} CURVILINEAR stagrx={self.stagrx} "
        f"stagry={self.stagry} mxinp={self.mxinp} myinp={self.myinp} "
    )
    if self.excval is not None:
        repr += f" EXCEPTION excval={self.excval}"
    if self.nonstationary is not None:
        repr += f" {self.nonstationary.render()}"
    repr = [repr] + [self.readinp.render()]
    return repr

UNSTRUCTURED

Bases: INPGRID

SWAN unstructured input grid.

.. code-block:: text

INPGRID [grid_type] UNSTRUCTURED EXCEPTION [excval]) &
    (NONSTATIONARY [tbeginp] [deltinp] ->SEC|MIN|HR|DAY [tendinp])
READGRID [grid_type] [fac] 'fname1' [idla] [nhedf] ([nhedt]) ([nhedvec]) &
    ->FREE|FORMAT|UNFORMATTED ('form'|[idfm])

This is a group component that includes an INPGRID and a READGRID component.

Examples

.. ipython:: python :okwarning:

from rompy_swan.components.inpgrid import UNSTRUCTURED
inpgrid = UNSTRUCTURED(
    grid_type="bottom",
    excval=-99.0,
    readinp=dict(fname1="bottom.txt"),
    nonstationary=dict(
        tbeg="2019-01-01T00:00:00",
        tend="2019-01-07 00:00:00",
        delt=3600,
        dfmt="hr",
    ),
)
print(inpgrid.render())
Source code in src/rompy_swan/components/inpgrid.py 
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class UNSTRUCTURED(INPGRID):
    """SWAN unstructured input grid.

    .. code-block:: text

        INPGRID [grid_type] UNSTRUCTURED EXCEPTION [excval]) &
            (NONSTATIONARY [tbeginp] [deltinp] ->SEC|MIN|HR|DAY [tendinp])
        READGRID [grid_type] [fac] 'fname1' [idla] [nhedf] ([nhedt]) ([nhedvec]) &
            ->FREE|FORMAT|UNFORMATTED ('form'|[idfm])

    This is a group component that includes an `INPGRID` and a `READGRID` component.

    Examples
    --------

    .. ipython:: python
        :okwarning:

        from rompy_swan.components.inpgrid import UNSTRUCTURED
        inpgrid = UNSTRUCTURED(
            grid_type="bottom",
            excval=-99.0,
            readinp=dict(fname1="bottom.txt"),
            nonstationary=dict(
                tbeg="2019-01-01T00:00:00",
                tend="2019-01-07 00:00:00",
                delt=3600,
                dfmt="hr",
            ),
        )
        print(inpgrid.render())

    """

    model_type: Literal["unstructured", "UNSTRUCTURED"] = Field(
        default="unstructured", description="Model type discriminator"
    )

    def cmd(self) -> str:
        repr = f"{super().cmd()} UNSTRUCTURED"
        if self.excval is not None:
            repr += f" EXCEPTION excval={self.excval}"
        if self.nonstationary is not None:
            repr += f" {self.nonstationary.render()}"
        repr = [repr] + [self.readinp.render()]
        return repr

Attributes

model_type class-attribute instance-attribute 

model_type: Literal['unstructured', 'UNSTRUCTURED'] = Field(default='unstructured', description='Model type discriminator')

Functions

cmd 

cmd() -> str
Source code in src/rompy_swan/components/inpgrid.py 
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def cmd(self) -> str:
    repr = f"{super().cmd()} UNSTRUCTURED"
    if self.excval is not None:
        repr += f" EXCEPTION excval={self.excval}"
    if self.nonstationary is not None:
        repr += f" {self.nonstationary.render()}"
    repr = [repr] + [self.readinp.render()]
    return repr

Specialized Grids

WIND

Bases: BaseComponent

Constant wind input field.

.. code-block:: text

WIND [vel] [dir]

With this optional command, the user indicates that the wind field is constant.

Examples

.. ipython:: python :okwarning:

from rompy_swan.components.inpgrid import WIND
wind = WIND(vel=10.0, dir=270.0)
print(wind.render())
Source code in src/rompy_swan/components/inpgrid.py 
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class WIND(BaseComponent):
    """Constant wind input field.

    .. code-block:: text

        WIND [vel] [dir]

    With this optional command, the user indicates that the wind field is constant.

    Examples
    --------

    .. ipython:: python
        :okwarning:

        from rompy_swan.components.inpgrid import WIND
        wind = WIND(vel=10.0, dir=270.0)
        print(wind.render())

    """

    model_type: Literal["wind", "WIND"] = Field(
        default="wind", description="Model type discriminator"
    )
    vel: float = Field(description="Wind velocity at 10 m elevation (m/s)", ge=0.0)
    dir: float = Field(
        description=(
            "Wind direction at 10 m elevation (in degrees, Cartesian or Nautical "
            "convention, see command SET)"
        ),
        ge=-180.0,
        le=360.0,
    )

    def cmd(self):
        return f"WIND vel={self.vel} dir={self.dir}"

Attributes

model_type class-attribute instance-attribute 

model_type: Literal['wind', 'WIND'] = Field(default='wind', description='Model type discriminator')

vel class-attribute instance-attribute 

vel: float = Field(description='Wind velocity at 10 m elevation (m/s)', ge=0.0)

dir class-attribute instance-attribute 

dir: float = Field(description='Wind direction at 10 m elevation (in degrees, Cartesian or Nautical convention, see command SET)', ge=-180.0, le=360.0)

Functions

cmd 

cmd()
Source code in src/rompy_swan/components/inpgrid.py 
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def cmd(self):
    return f"WIND vel={self.vel} dir={self.dir}"

ICE

Bases: BaseComponent

Constant wind input field.

.. code-block:: text

ICE [aice] [hice]

With this optional command, the user indicates that one or more ice fields are constant.

Examples

.. ipython:: python :okwarning:

from rompy_swan.components.inpgrid import ICE
ice = ICE(aice=0.1, hice=0.1)
print(ice.render())
Source code in src/rompy_swan/components/inpgrid.py 
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class ICE(BaseComponent):
    """Constant wind input field.

    .. code-block:: text

        ICE [aice] [hice]

    With this optional command, the user indicates that one or more ice fields are
    constant.

    Examples
    --------

    .. ipython:: python
        :okwarning:

        from rompy_swan.components.inpgrid import ICE
        ice = ICE(aice=0.1, hice=0.1)
        print(ice.render())

    """

    model_type: Literal["ice", "ICE"] = Field(
        default="ice", description="Model type discriminator"
    )
    aice: float = Field(
        description="Areal ice fraction, a number from 0 to 1", ge=0.0, le=1.0
    )
    hice: float = Field(description="Ice thickness (m)", ge=0.0)

    def cmd(self):
        return f"ICE aice={self.aice} hice={self.hice}"

Attributes

model_type class-attribute instance-attribute 

model_type: Literal['ice', 'ICE'] = Field(default='ice', description='Model type discriminator')

aice class-attribute instance-attribute 

aice: float = Field(description='Areal ice fraction, a number from 0 to 1', ge=0.0, le=1.0)

hice class-attribute instance-attribute 

hice: float = Field(description='Ice thickness (m)', ge=0.0)

Functions

cmd 

cmd()
Source code in src/rompy_swan/components/inpgrid.py 
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def cmd(self):
    return f"ICE aice={self.aice} hice={self.hice}"