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The extinction factors are determined on a cell by cell basis for each time step based on TSS, and if the water quality model is active, based on POM, DOM and Chlorophyll-a as well. Figure 7 shows Light Extinction Option
Figure 6. Light Extinction
The Solar Radiation Option for Photosynthesis frame provides the user with a drop-down menu from which the source for radiation data may be selected, these include: Constant; Read Daily Average (SUNDAY.INP); and Use Solar Radiation in ASER.INP. The Modify button then allows the user to set various solar radiation options including initial solar radiation at the water surface, minimum optimum solar radiation, the fraction of day that is daylight, among others.
Figure 7. Solar Radiation Option for Photosynthesis frame.
Figure 8. Solar Radiation Options form.