Upload of MIKE SHE Hot Start Run Script - #9
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This script allows for using a previous simulation's 3D water content distribution as a hot start condition for another WM simulation by overwriting the water content in the new simulation over the first several timesteps.
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The new script has a confirmed runtime-breaking issue in how the MShePy extension module is loaded, and also needs small structural/convention fixes to be safely usable from the repo.
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Pull request overview
Adds a new SimulationExecution helper script intended to “hot start” a MIKE SHE WM simulation by reading 3D unsaturated-zone water content from a previous run and overwriting initial timesteps before continuing the run.
Changes:
- Introduces
MSHE_HotStart.pyto read UZ water content from a dfs3 result and apply it as initial conditions for several timesteps. - Initializes and advances the MIKE SHE WM engine programmatically, then runs to the simulation end time.
File summaries
| File | Description |
|---|---|
| SimulationExecution/MSHE_HotStart.py | New hot-start execution script that reads prior-run UZ water content and overwrites UZ_WC for the first N timesteps. |
Review details
- Files reviewed: 1/1 changed files
- Comments generated: 4
- Review effort level: Low
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| import importlib.util | ||
| spec = importlib.util.spec_from_file_location('MShePy311', r'C:\Program Files (x86)\DHI\MIKE Zero\2025\bin\x64\MShePy311.pyd') | ||
| MShePy = importlib.util.module_from_spec(spec) | ||
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| # Load DFS3 Result File of Unsat Zone and get Water Content Array | ||
| print('Importing Water Content Data From Previous Model Run...') | ||
| uz_data = mikeio.read(r'D:\Projects\MIKESHE_Hotstart\TestModel\TestModel_3DUZ.dfs3') | ||
| wc_arr = uz_data['water content in unsaturated zone'] | ||
| wc_arr_finalts = wc_arr[-1,:,:,:].values # Access array of 3D water content values at final timestep | ||
| #Transpose Z dimensions from first dim of array to last to align with MShePy dataset structure | ||
| wc_arr_finalts = np.transpose(wc_arr_finalts, (1, 2, 0)) | ||
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| # Initiate MIKE SHE Model | ||
| print('Initializing MIKESHE Model...') | ||
| model = r'D:\Projects\MIKESHE_Hotstart\TestModel\TestModel.she' | ||
| MShePy.wm.initialize(model) | ||
| MShePy | ||
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| simperiod = MShePy.wm.simPeriod() | ||
| start_time = simperiod[0] | ||
| end_time = simperiod[-1] | ||
| assign_timesteps = 10 # Number of timesteps to execute water content overwrite | ||
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| for ts in range(assign_timesteps): | ||
| print(ts) | ||
| (t0, t1, wc) = MShePy.wm.getValues(MShePy.paramTypes.UZ_WC) | ||
| wc[:] = wc_arr_finalts.tolist() | ||
| MShePy.wm.setValues(wc) | ||
| MShePy.wm.performTimeStep() |
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| print('Importing Required Libraries...') | ||
| # Import MIKESHE |
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self-requested a review
July 30, 2026 12:28
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Uploading a run script to SimulationExecution that can allow for using 3D water content distribution from previous WM simulations as the starting condition for another WM simulation by overwriting water content for the first several timesteps.