Runoff generation mechanisms

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Conclusions• Surface runoff <strong>generation</strong> mechanism was mostly infiltrationexcess in the Sandmountain pasture of Alabama.• Rainfall intensity and soil hydraulic conductivity controlsurface runoff <strong>generation</strong>.• At times (when the rainfall intensity is high), surface runoffcan be generated from the entire hillslope.• Connected areas of low soil hydraulic conductivitycontribute most of the surface runoff at the outlet.• Overall, preliminary analysis shows that during high-intensity short and medium duration rainfalls no more than10% of the rainfall results in surface runoff at the outlet.• For medium-intensity, intensity, long duration rainfalls no more than5% of the rainfall results in surface runoff
Implications and Future Work• Since surface runoff contributions to the outlet is small –significant infiltration occurs, highlighting the importance ofunderstanding subsurface flows and subsurface transport.Subsurface stormflowPPPPerched subsurface stormflowPPPHorizon 1Horizon 2
Page 1 and 2: Hillslope Hydrology of Alabama’sS
Page 3 and 4: Justification• Alabama ranks in t
Page 5 and 6: Runoff Generation ProcessesInfiltra
Page 7 and 8: Runoff Generation Processes• Fact
Page 9 and 10: • A pasture hillslope of 0.12 haw
Page 11 and 12: Surface Runoff Sensor• Surface se
Page 13 and 14: Instrumentation
Page 15 and 16: Results and DiscussionRunoff Genera
Page 23 and 24: Results and DiscussionSpatial and T
Page 25: Results and DiscussionSpatial and T

Runoff generation mechanisms

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