Green-Ampt Infiltration Parameters: Difference between revisions

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== Capillary Suction Head ==
The suction head, represented in millimeters, is the capillary attraction on the soil voids. It is large for fine grain soils such as clays and smaller for sandy soils.<br>
To test the sensitivity of the simulated runoff at a gauged location, as shown in figure 2, a low (49.5), mid representing the mean (184.4) and high (316.3) value of the suction head parameter was used with other parameters representing a clay soil (soil type 1).<br>
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 3: 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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'''Figure 3: 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 54. 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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