EROSI

Types of Erosion

1. Water Erosion

2. Wind Erosion

3. Gravitical erosion

4. Frozen melt Erosion

Water Erosion

Raindrops washes out seed and splashes soil into the air

If the fields are on a slope the soil is splashed downhill which causes deterioration of soil structure. Soil that has been detached by raindrops is more easily moved than soil that has not been detached.

Sheet erosion

Types of Water Erosion

Sheet erosion the uniform removal of soil in thin layers from sloping land

the loose soil merely runs off with the rain RAINDROPS

Rill erosion It occurs when soil is removed by water from little streamlets that run through land with poor surface draining.

Gully erosion an advanced stage of rill erosion, just as rills are often the result of sheet erosion

Sheet erosion

Rill erosion

Gully erosion

Wind erosionWind erosion is the movement and deposition of soil particles by wind

Wind erosion occurs when soils bared of vegetation are exposed to high-velocity wind. When its velocity overcomes the gravitational and cohesive forces of the soil particles, wind will move soil and carry it away in suspension

Occurring mostly in flat, dry areas and moist sandy soils along bodies of water, wind erosion removes soil and natural vegetation, and causes dryness and deterioration of soil structure.

Surface texture is the best key to wind erosion hazard potential

Gravitical erosion

mass movement of soil - slides, slips, slumps, flows and landslides - gravity is the principal force acting to move surface materials such as soil and rock

occurs when the weight (shear stress) of the surface material on the slope exceeds the restraining (shear strength) ability of that material

Factors increasing shear stress include erosion or excavation undermining the foot of a slope, loads of buildings or embankments, and loss of stabilizing roots through removal of vegetation.

Frozen-melt erosion

When water freezes, it expands suddenly and with tremendous force

When water inside a crack in a rock freezes, its expansive strength may be sufficient to crack the rock and to break parts off it.