3.The type of erosion which occurs when water picks up speed and digs narrow streamlets in unprotected soil
Answers
Answer:
Rainfall, and the surface runoff which may result from rainfall, produces four main types of soil erosion: splash erosion, sheet erosion, rill erosion, and gully erosion.
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Answer:
Queensland’s high intensity summer rainfalls represent a significant risk of erosion by water.
Raindrops hit bare soil with enough force to break the soil aggregates. These fragments wash into soil pores and prevent water from infiltrating the soil. Water then accumulates on the surface and increases runoff which takes soil with it.
Well-structured soils are less prone to break up, and the impact of raindrops is minimised if the soil surface is protected by plant or litter cover. The vulnerability of soils to water erosion depends on:
rainfall intensity (erosivity)—high intensity rainfall creates serious risk as heavy drops on bare soil causes the soil surface to seal
nature of the soil (erodibility)—clay soils vary in their ability to withstand raindrop impact
slope length—if a slope is long, water running down the slope becomes deeper and moves faster, taking more soil with it
slope steepness—the speed of runoff increases on steep slopes, which increases the power of water to break off and carry soil particles.
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