(#) Soil erosion Flashcards
What is soil erosion?
Detachment and movement of soil or rock by water, wind, ice, or gravity
What’s entrainment?
“transportation”
What’s deposition?
“settling down”
2 general types of erosion
1) Geological
2) Man-induced
Types of water erosion
1) Raindrop
2) Rill
3) Interrill
4) Sheet
5) Steamback
6) Scour
7) Ephemeral gully
8) Gully
RRISSSEG
WE : The detachment and airborne movement of small soil particles caused by the impact or raindrops on soils
Raindrop erosion
WE : The removal of a relatively uniform thin layer of soil from the land surface by rainfall and largely unchanneled surface runoff
Sheet erosion
WE : The removal of soil by water from small but well-defined channels of only several meters deep
Rill erosion
The removal of a fairly uniform layer of soil on a multitude of relatively small areas by splash due to raindrop impact AND by sheet flow
Interrill erosion
WE : The erosion process whereby water accumulated and ofter recurs in narrow channels and, over short periods, removes the soil from this narrow area to considerable depths
Gully erosion
WE : Small channels eroded by concentrated flow that can easily be filled by normal tillage, only to reform again in the same location by additional runoff events
Ephemeral gully
Caused by either runoff flowing at the side of the riverbank or by scouring and undercutting below the water surface
Steambank erosion
WE : Occurs in stream beds where undercutting of soil happens below the water surface
Scour erosion
Engineering measures against soil erosion
1) Terracing
2) Pond
3) Diversion canals
4) Check damn
5) Riprap
6) Retaining wall
7) Gabions
Terrence’s Pride Diverted Chet’s Rampant Reign Greatly
EM : A depression of considerable size used to collect runoff
Pond
