basic soil erosion and types - university of wisconsin · composition chemical and ... or even...
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Basic Soil Erosion and Types
Stacy Dehne DATCP Engineer
2015 Wisconsin Lakes Convention
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Types of Soil ErosionRain drop or splash erosion:
Erosion preceded by the destruction of the crumb structure due to the impact of falling raindrop on the surface of soil is termed as splash erosion.
Sheet erosion: It is the fairly uniform removal of soil in thin layers from the land surface, often scarcely perceptible, especially when caused by wind. Areas where loose, shallowtopsoil overlies compact soil are most susceptible to sheet erosion.
Rill erosion: A form of water erosion in which numerous very small and more or less straight channels are produced; the channels get obliterated by ordinary use. It can be removed by normal tillage operations.
Gully erosion: A form of water erosion in which gullies are produced by combination of unattended rills.
Stream bank erosion: Stream banks are eroded by water either flowing over the sides of a stream or scouring at the base. It is aggravated by removal of vegetation, over grazing or cultivation near the stream banks.
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Slope angle and length affects runoff generated when rain falls to the surface. Examine the diagram below showing the relationship between hill slope position,
runoff, and erosion.
Figure 11.10 Hill slope position, runoff & erosion
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Soil Types
Ability to resist erosion forces
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Soil Has Different Properties From:Geologic OriginCompositionChemical and Physical
Density and Particle Size
Permeability and Change due to COMPACTION
Strength – Tensile, Shear, Bearing Capacity
Erosion based on:Cohesive (clay) vs. Non cohesive (sand)
Water Table and Saturation
Vegetation and Roots
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Geologic Origin Parent Material
character and chemical composition of the parent materialplays an important role in determining soil properties
Glaciers, Floods, and Water Movement As glaciers pushed, they act like giant bulldozers pushing soil ahead of them. Glacial ‘till’ or ‘drift’ deposits resulted many tens or even hundreds of miles from where the soils were first formed. Water is also very important in moving soils. As rivers flow, theytransport soil particles along. If soil is washed into a river, thesmallest particles will be carried the furthest by the water as theyweigh the least. Heavier particles, such as sand, will be dropped earlier. Soils dropped around streams are termed ‘alluvial’. Soils deposited in lakes are called 'lacustrine', soils deposited by rivers 'riverine' and by sea 'marine' alluvial soils
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Composition
Percent Silt, Clay, Sand, Gravel
Uniform or Poorly Graded
Layered Horizontally or Diagonally
Densely Packed or Loose
Particle Sizes
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Chemical and Physical Properties
pH, Conductivity, Calcium Carbonate and plant survival
Soil Structure
Susceptibility of soil to sheet and rill erosion by water
Plasticity Index
Water Content
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Vegetation Holds Soil
4.0 Ft
Turf Grass
16 Ft
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ErosionDepends on Soil Properties
Highly Erodible Lands (Parent Material)
Cohesive Clays or Non-cohesive sands
Densely Packed or Loose Materials
Permeability and Water Movement (seeps)
How Soils perform under loading (structures)
Effective stress and water table fluctuations
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Various Techniques or Combinations of Techniques to “Help” Soils Prevent Erosion
Natural Shoreline Native Plantings Biolog w/ Plantings Branch Box
Breakwater Brush Mattress Live Fascine Branch Packing Vegetated Geogrid
Rock Riprap Rock Riprap w/ Live
Stakes; “vegetated riprap”
Demo/Experimental
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3 YEAR OLD BIOLOG
Biolog
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Brush MattressTechniques
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Live FascineTechniques
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Branchbox Breakwater
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TechniquesBranch Packing
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Techniques Vegetated Geogrid
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Vegetated Riprap
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Case Studies (1) Problem ID & Techniques used
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Case Studies (1) Problem ID & Techniques Used, cont
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Case Studies (1) Design Standards & Lessons Learned
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Case Studies (2) Problem ID & Techniques Used
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Case Studies (2) Design Standards & Lessons Learned
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Case Studies (3) Problem ID & Techniques Used
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Case Studies (3) Design Standards & Lessons Learned
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Upland RunoffErosion Factor
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ShoreMax Product
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Questions?