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SSM chapter 18 and 19
SSM CH18CH19
51
Environmental Studies
Undergraduate 2
03/31/2013

Additional Environmental Studies Flashcards

 


 

Cards

Term
what are some of the consequences of erosion
Definition
removal of topsoil(which contains plant material and organic matter), thinning of soil profile, gullies cut feilds. The runoff then pollutes nearby lakes with nutrients and pesticiides.
Term
what are some of the costs of erosion?
what are the two parts of the cost of ersion?
Definition
1.costs to the farmer and consumer of production losses, and
2.costs to the public of pollution and sedimentation.
costs reange from an estimated 40 million to 27 billion. offsite damages are generally significantly larger, ranging from 3.1 to 17 billion per year
Term
what is the erosion equation?
Definition
erosion is equal to E=(1/2)mv^2
Term
what are some qualities of soil that determine the rainfall erosiveness?
Definition
texture and structure, slope, surface roughness, soil cover
Term
splash erosion
Definition
the direct movement of soil by splashing.
Term
sheet erosion
Definition
the removal of a thin layer of soil in a sheet due to water.
Term
rill erosion
Definition
many small channels formed on a slope by water, like a miniature river.
Term
ephemeral gully erosion
Definition
ephemeral gullies are large rills. The channel is small enough that tillage equipment can largely fill it in , but not completely.
Term
gully erosion
Definition
most visible type of erosion, caused by deep channelization by running water.
Term
what are the five types of water erosion
Definition
gully erosion, ephemeral gullies, rill erosion, sheet erosion, splash erosion.
Term
concentrated flow
Definition
the combination of both ephemeral and gully erosion, in which water forms into channels. erosive energy is focused, and soil can be carried off the field.
Term
universal soil loss equation
Definition
main tool for estimating soil erosion rates, but only predict sheet and rill erosion, and not ephemeral or gully erosion. Thus equation underestimates soil loss.
Term
What is the USLE equation for soil loss?
Definition
A=RKLSCP, where a is the amount of tonnes of soil lost each year.
Term
Understand how to use the equation.
Definition
Term
what is the erosion index?
Definition
EI=(RKLS/T). Refer to other slide to see what variables refer to.
Term
what does R, K, L, S, C, and P stand for?
Definition
r is rainfall and runoff factor, based on total erosive power of storms during and average year.
Term
K
Definition
soil erodability factor(texture, structure, organic matter content)
Term
LS
Definition
Slope factor. they are two separate factors but can be treated as one.
Term
C
Definition
Cover and management factor. C comares cropping practices, residue management, and soil cover to the standard clean fallow plot.
Term
P
Definition
support practice factor.
Term
What are the four actions that can be done to control water erosion?
Definition
1.reduce raindrop impact to lesson soil detachment.
2. Reducing of slowing runoff
3. carrying excess water off the field safely by use of grass waterways or tile outlets.
4.filter soil particles out of running water
Term
contour tillage
Definition
tilling on the contour, then planting and following the same contour to lessen the runoff.
Term
strip cropping
Definition
alternating a dense cover crop with a not as dense cover crop along thw contour in order to prevent runoff.
Term
grassed waterway
Definition
a shallow, sodded, wide ditch that runs down a slope. their main purposes are:
1.prevent gullying
2.collect excess water from tillage contours
3. serve as outlets for terraces.
Term
conservation buffer
Definition
strips of permanent vegetation that slow overland flow and act as living filters to remove sediment, nutrients, and pesticides.
Term
contour buffer strip
Definition
strips of permanent vegetation planted on the contour between strips of cultivated crops(similar to contour strip cropping, just with grass as one of the crops)
Term
filter strips
Definition
lie along the downhill edge of a feild, and work to filter sediment out of runoff from a feild before it can leave.
Term
riparian buffers
Definition
strips of permanent vegetation along streams, wetlands, etc to protect water quality from feild runoff.
Term
when is a terrace used?
Definition
when other measures fail to reduce erosion adequately.
Term
what are the two typs of terraces and when are they used
Definition
level and graded; level is used when soil is permeable enough to allow water to seep in once captured by the terrace.
In the other hand, graded terrace is used when water CANNOT soak in enough. They might be drained underground of slope towards the waterway.
Term
what are the four uses of diversions
Definition
1. protecting feilds from runoff flowing from higher elevations
2. diverting water away from active gully heads
3.diverting water from feed lots, farmsteads, or other sensitive areas,
4. in residential housing, diverting water away from homes.
Term
boundary layer
Definition
a very thin layer still air that covers a soil surface, but larger rocks stick up above the layer.
Term
saltation
Definition
the process of grain of a grain of sand jumping into the air, coming back down, knocking silt in to the air from its impact.
Term
suspension
Definition
when dust rises into the air and is carried for long distances.
Term
surface creep
Definition
when sand between the size of .02 and .04 inches are too large to be kicked into the air, they roll along the ground
Term
what are some possible ways to reduce wind erosion?
Definition
till at right angles to the wind
2.use conservation tillage or leave crop residue on the soil surface
3. keep soil covered with as much vegetation as possible.
moiste soil to keep it bound together better.
plant windbreaks such as trees and shrubs
plant the most critical areas to permanent grasslands or other vegetative cover.
Term
Brown feilds
Definition
abandoned idled, or underused industrial or commercial facilities where redevelopment is hampered by real or perceived contamination.
Term
bioremediation
Definition
the use of living things to reduce pollution.
Term
what are some ways to control construction erosion and sedimentation?
Definition
1. Keep disturbed areas small.
2.protect disturbed areas.
3.keep runoff velocities low.
4. divert runoff away from disturbed sites
5.retain sediment on site.
Term
erosion control blanket
Definition
blankets that can be rolled over bare soil. They are biodegradable.
Term
hydromulching
Definition
involves blowing mixtures of water, finely chopped straw, and seed over disturbed areas. vegetation should grow from seed.
Term
rip rap
Definition
covering soil with concrete.
Term
check dams and wattles
Definition
bundles of straw placed in an area where runoff is happening in an attempt to reduce sediment load.
Term
silt fence
Definition
a dense mesh fabric buried partially underground and attached to posts to create a fence which strains the sediment load from water as it passes through.
Term
retention ponds and sediment basin
Definition
places where sediments are taken and settle out.
Term
low impact development or zero runoff development
Definition
another option which involves leaving the water on site and allowing it to filter into the soil, using the water for irrigation rather than disposal.
Term
swales
Definition
a shallow ditch where water is carried to in developments.
Term
bioswale
Definition
a swale with deep porous soil and dense vegetation that slows runoff, promotes infiltration, and traps sediment.
Term
recharge basin
Definition
retention ponds that are designed to promote infiltration rather than simply hold water.
Term
rain garden
Definition
a depression in the yard that is meant to absorb the rain an drunoff.
Term
green roofs
Definition
beds of vegetation planted on rooftops. can either be extensive(little) or intentsive (a lot)
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