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Inland basin flow coupling#401

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Dan Copsey (DanCopsey) wants to merge 11 commits intoMetOffice:mainfrom
DanCopsey:inland_flow
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Inland basin flow coupling#401
Dan Copsey (DanCopsey) wants to merge 11 commits intoMetOffice:mainfrom
DanCopsey:inland_flow

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@DanCopsey Dan Copsey (DanCopsey) commented Mar 26, 2026

PR Summary

Sci/Tech Reviewer:
Code Reviewer: Erica Neininger (@ericaneininger)

Receive inland basin flow from the rivers executable via OASIS and transfer that water into JULES to end up in the soil.

  • linked MetOffice/jules#89
  • linked MetOffice/um#63

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Currently run_lfric_coupled_nwp_gal9-C48_ex1a_cce_fast-debug-64bit fails with:
ERROR: soil_moisture has gone negative with a value of -0.28421709E-13
I will investigate.

@github-actions github-actions bot added cla-signed The CLA has been signed as part of this PR - added by GA and removed cla-required The CLA has not yet been signed by the author of this PR - added by GA labels Mar 27, 2026
melt_pond_depth)

! Output extra coupling diagnostics
call inland_basin_flow%write_field('surface__inland_basin_flow')
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Suggested change
call inland_basin_flow%write_field('surface__inland_basin_flow')
call inland_basin_flow%write_field('soil__inland_basin_flow')

this needs to match what is set in field_def_diags

<field id="soil__soilm_change_lakes" />
<field id="soil__soil_moisture" />
<field id="soil__unfrozen_soil_moisture" />
<field id="surface__inland_basin_flow" />
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Suggested change
<field id="surface__inland_basin_flow" />
<field id="soil__inland_basin_flow" />

again, needs to match field_def_diags

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Inland basin flow coupling

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