wk 15

19 cards·by tristanscards

what are the two steps of erosion

loss of top/cover soil, vegetation degradation

geologic vs accelerated erosion

geologic-> natural >.1-.5, accelerated->human caused, 10x as much

soil texture thats most easily detached and transported

silt

examples of factors causing permeability restrictions

texture, structure, and cover

what topographic factors affect transportation of detached materials

sheet erosion, rills and gullys

what climactic and weather factors affect transportation of detached materials

rain on snow, annual rain, drought, snow

why are silt and very fine sand size particles more easiliy detached than clays

clays act like agreggates

things that prevent erosion

conservation tillage mulch(forest) strip cropping cover crop grass cover

A=RKLSCP. a=

annual soil lost

A=RKLSCP. r=

rain (climactic factor)

A=RKLSCP. k=

soil erodibility

A=RKLSCP. L=

length slope

A=RKLSCP. s=

% slope

A=RKLSCP. c=

cover

A=RKLSCP. p=

supportive mgt. practices

3 types of movement related to wind erosion

creep >.5mm rolls, saltation .1 to .5 mm bounce, suspension-- < .1 mm in wind

type of conditions leading to dust bowl

tillage, PM, Drought

What are windbreaks? how do they help control erosion?

trees- reduce wind, layers, control evaporation

maximum protected area on a leewar (downward) side of a windbreak

10 ft tall = 100 ft