The Design Document page provides a description of the algorithms, implementation and planned testing including unit, verification, validation and performance testing. Please read Step 1.3 Performance Expectations that explains feature documentation requirements from the performance group point of view.
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Date last modified: 30 August 2021
Contributors: Michael Brunke
ELM generates negative runoffs, especially in the tri-grid configuration. This is coming from the QRGWL, the combined runoff from glaciers, wetlands, and lakes. This goes negative periodically to maintain these features. Figure 1 shows that most of the grid cells generating negative total runoff (blue in panel (a)) occur in areas with lake fraction > ~5%.
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Date last modified: 30 August 2021
Contributors: Michael Brunke
Figure 1b shows the total runoff from a test run including lake water storage. The negative runoff from the grid cells with lakes is eliminated. The only negative runoff left is from grid cells containing glaciers.
Figure 2 (below) shows that the addition of this feature has minimal impact on the total discharge in MOSART.
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Unit testing will be performed by running the E3SM land developer suite.
Planned Verification and Unit Testing
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Planned Performance Testing
Performance Testing:
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Performance testing with lake water storage
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Date last modified: 31 August 2021
Contributors:
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Michael Brunke
This feature should have a minimal impact on the performance of the model. This will be verified from the model's timing tables.