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GEOG 402
Soil Hydraulic Processes
HAWAI‘I HYDROLOGIC CYCLE
Soil Hydraulic Properties • Soil surface acts as a “filter” allowing
water to enter (infiltrate), but limiting how fast infiltration can occur
• Soil acts as a porous medium, both storing and transmitting water
• Soil properties vary according to soil type, vegetative cover, and human activities
Infiltration
Water movement in soil
Infiltration capacity
Infiltration capacity
Soil Hydraulic Properties • Dry Bulk Density: Mass per unit volume of the
soil with the water removed • Hydraulic Conductivity: Rate of water
movement under a unit gradient; increases as water content increases; saturated hydraulic conductivity is maximum
Both of these properties vary among different soils and are affected by vegetation and compaction from human activities
Land Use Effects on Soil Bulk Density and Hydraulic Conductivity
Soil Moisture Retention
Soil Moisture Retention
Porosity, Field Capacity, Wilting Point
Available Water Capacity
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