Inland flow #79
Inland flow #79
Conversation
| TRUE | ||
| Some rivers end at inland basin flow points. This inland basin flow is used to increase soil moisture at these locations. For this to work JULES rivers_standalone needs | ||
| to be run as a separate executable and the inland basin flow needs to be passed into this land surface component via OASIS using :nml:mem:`OASIS_RIVERS::send_fields`. | ||
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Suggested rewording as it has to be relevant for the UM.
Some rivers end at inland basin flow points. This inland basin flow is used to increase soil moisture at these locations for water conservation purposes. This is only available for coupled models i.e. UM or LFRic. When coupled to LFRic, the soil moisture flux correction applied by this switch must be calculated by the Rivers-standalone component (:nml:mem:JULES_MODEL_ENVIRONMENT::lsm_id = 3) and passed to LFRic via OASIS using :nml:mem:OASIS_RIVERS::send_fields = inland_outflow.
| .. nml:namelist:: JULES_LAND_FRAC | ||
| Land fraction is the fraction of each gridbox that is land. Currently, JULES considers any gridbox with land fraction > 0 to be 100% land, and all others to be 100% sea (or sea-ice). Land fraction data can be used to select only land points from the full input grid (see below). | ||
| Land fraction is the fraction of each gridbox that is land. By default, JULES considers any gridbox with land fraction > 0 to be 100% land, and all others to be 100% sea (or sea-ice). To keep land fractions as fractions then set l_use_land_fraction to True. Land fraction data can be used to select only land points from the full input grid (see below). |
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Land fractions are only used by TRIP in Rivers-standalone to determine coastal endorheic basins. So the docs should reflect this. How about:
Land fraction is the fraction of each gridbox that is land. By default, JULES considers any gridbox with land fraction > 0 to be 100% land, and all others to be 100% sea (or sea-ice). Rivers-standalone (TRIP) when coupled to LFRic needs to be able to determine coastal endorheic basins. In this case, :nml:mem:l_use_land_fraction, allows the land fractions to be kept. Land fraction data can be used to select only land points from the full input grid (see below).
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| No inland basin flow. | ||
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Should highlight that this is only used in coupled models e.g.
.. note::
Inland basin flow is only available to coupled models i.e. UM & LFRic via OASIS-Rivers.
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| :default: F | ||
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Currently there is no link between l_inland and l_use_land_fraction in the code as they are done in two steps. l_inland cannot be used unless coupled, however this is a standalone namelist so it is a bit confusing I think. How about first having an explanation of when the switch is used.
Land fractions are used to determine coastal endorheic basins to calculate the inland basin flow diagnostic inland_outflow_rp or :nml:mem:OASIS_RIVERS::send_fields = inland_outflow.
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| Land fractions are not used and the land fraction field is set to either 1.0 (any land) or 0.0. | ||
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.. note:: This is only available in Rivers-standalone (TRIP) to calculate inland outflow fields.
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| Supply land fractions (as fractions) to both the main grid and the rivers grid (if grids are compatible). This is needed for water conservation when using inland basin flow (l_inland = True). |
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Supply land fractions (as fractions) to both the main grid and the rivers grid. This requires both grids and land-sea mask to be the same.
Add the l_inland switch, the l_use_land_fraction switch and add inland_outflow to the list of possible send_fields.
Associated with JULES ticket #1528 = https://code.metoffice.gov.uk/trac/jules/ticket/1528