Green-Ampt Infiltration Parameters: Difference between revisions
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The comparison has been undertaken on a real-world model of the Plynlimon catchment in mid-Wales. The model was run with a real rainfall event from 2015 with a temporal resolution of 30 minutes as shown in the Figure 2.<br>
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[[File:Fig2 GWY RF.png|600px|Figure 2: Plynlimon Rainfall]]<br>
'''Figure 2: Plynlimon Rainfall'''<br>
Within the Plynlimon catchment, the soil types were distributed within the catchment as shown in the map below although a single soil type has been selected for the comparison. Therefore, the effect seen is a consequence of changing a single soil parameter value.<br>
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[[File:Fig3 GWY SoilMap.png|600px|Figure 3: Plynlimon Gwy Catchment Soil Types]]<br>
'''Figure 3: Plynlimon Gwy Catchment Soil Types'''<br>
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The larger the value the capillary suction head value, the more capillary action that is achieved and the amount of infiltration that takes place. This is shown by the increase in cumulative infiltration in the graph below with a greater cumulative infiltration for the 20% increase in the suction head.<br>
[[File:Fig4 sens to suction.png|600px|Figure 4: Sensitivity of cumulative infiltration in the Plynlimon Gwy catchment to the Capillary Suction Head parameter in the Green-Ampt infiltration model.]]<br>
'''Figure 4: Sensitivity of cumulative infiltration in the Plynlimon Gwy catchment to the Capillary Suction Head parameter in the Green-Ampt infiltration model.'''<br>
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As a consequence of this, there is a less runoff generated as shown in Figure 5. The model is not particularly sensitive to the suction head parameter and this fits with observations made within the literature.<br>
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[[File:Fig5 suctionhead.png|600px|Figure 5: Sensitivity of simulated flow at the Cefn-Brwn gauge locations in the Plynlimon Gwy catchment to the Suction head parameter in the Green-Ampt infiltration model.]]<br>
'''Figure 5: Sensitivity of simulated flow at the Cefn-Brwn gauge locations in the Plynlimon Gwy catchment to the Suction head parameter in the Green-Ampt infiltration model.'''<br>
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As shown in figure 8, the higher the porosity value, then the less runoff occurs due to increased infiltration although the model is not particular sensitive to the porosity value.<br>
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[[File:Fig7 porosity sens.png|600px|Figure 7: Sensitivity of simulated flow at 3 gauge locations in the Plynlimon Gwy catchment to the porosity parameter in the Green-Ampt infiltration model.]]<br>
'''Figure 7: Sensitivity of simulated flow at 3 gauge locations in the Plynlimon Gwy catchment to the porosity parameter in the Green-Ampt infiltration model.'''<br>
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[[File:Fig8 porosity sens.png|600px|Figure 8: Sensitivity of cumulative infiltration in the Plynlimon Gwy catchment to the porosity parameter in the Green-Ampt infiltration model.]]<br>
'''Figure 8: Sensitivity of cumulative infiltration in the Plynlimon Gwy catchment to the porosity parameter in the Green-Ampt infiltration model.'''<br>
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