| name | run2_glm-config |
| description | Advanced GLM configuration and calibration strategies for vertical temperature profiles. |
Advanced GLM Configuration
The General Lake Model (GLM) performance depends on several key parameters that govern energy balance and mixing.
Calibration Parameters and Effects
- Kw (Light Extinction): Controls how deep light penetrates. Higher
Kw keeps deep layers cooler and surface layers warmer. Range: [0.1, 0.5].
- wind_factor: Scales input wind speed. Affects surface mixing and latent/sensible heat fluxes. Range:
[0.7, 1.3].
- lw_factor: Scales incoming longwave radiation. Affects the overall heat budget. Range:
[0.7, 1.3].
- ch (Sensible Heat Transfer): Bulk coefficient for sensible heat flux. Affects surface temperature. Range:
[0.0005, 0.002].
- coef_mix_hyp: Controls mixing below the thermocline. Lower values reduce heating of the hypolimnion. Range:
[0.3, 0.7].
Configuration Workflow
- Baseline Run: Start with default parameters.
- Energy Balance: Adjust
lw_factor and ch to align the overall temperature magnitude.
- Stratification: Adjust
Kw and wind_factor to match the thermocline depth and surface temperatures.
- Deep Mixing: Adjust
coef_mix_hyp to match deep water temperatures during summer.
Example sed command for precise replacement:
sed -i 's/\bKw\s*=\s*[0-9.e+-]*/Kw = 0.4/' glm3.nml
Or use Python regex for more complex cases.
