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The Met Office is developing a surface transport forecasting capability based on JULES (Joint UK Land Environment Simulator) to support operational road and rail forecasting applications. JULES was originally developed as a land-surface model for representing natural surfaces such as vegetation and soil. In its native form, it does not adequately represent key physical processes associated with road and rail surfaces, including impermeable surface behaviour, rapid water drainage and realistic snowmelt. To address this, the Met Office has already developed and scientifically evaluated an STF-JULES ("Surface Transport Forecasting JULES") capability based off a forked older version (v5.9) of the JULES codebase This includes: configuration and parameter tuning for road and rail surfaces; modifications to surface hydrology behaviour to represent impermeable transport surfaces; modifications to thermal conductivity and heat capacity handling; implementation of a road drainage/run-off scheme; modifications to snow handling to retain meltwater within the road surface water store . The existing source code modifications are contained within a small number of JULES routines: h
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