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Section 3
Hydrologic processes
42
Environmental Studies
Undergraduate 3
03/03/2012

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Term
PRECIPTATON 1/31/12 tuesday
Definition
key fea
WATER CYCLE includes precipitation lakes ect, various mechanisms of global circulation.
GLOBAL PRECIPTATION there is

high PRCIPIATION close to the ocean, HOT air can hold MORE water, higher temps higher humidity close to ocean, air RISING,

loW precip, dry
Air decending, getting "cooler?" and it now maks watervapor, don'tget as much precipititin?? check it out...
Term
o What tools can be used to monitor quantity and patterns of precipitation?
Definition
1. Tipping bucket, (aka raingage?)can continuously measure QUATITY of rain, measuring pecipitation ky one of mst important measurements
2. "Belfort" gage (weighing gage)
Can also continously monitor ACCUMULTION of precip, QUANTITY!!
*more common in sowy enviornmets, weighshow much snow comes in
*alta shield, wind deflector breaks it up a little befor wind flies over top, snow more affected by wind than rain.
*wind almost always makes measurements too low.

3. spaial patterns of precip through RADAR (Patterns, patterns of lo and high intensity precipitation, 3 and 4)
4. Satellite
5. Each day image updated, have to record every morning but shows actual precip for te day in different place of the country from normal peoplereprting www.cocorahs.org
6. Prism model - good source of info for MONTHLY and ANNUAL total precip

Tipping Bucket: Rain gauge that measure precipitation – continuously measures quantity of rain
Belford Gauge: Weighs – can also continuously monitor accumulation of precipitation and is wind protectant.
Precipitation Gauge: Weights how much – better because snow could accumulate on top of tipping bucket.
Term
o Why are each of the following precipitation statistics important for watershed management?: Storm depth
 Storm intensity
 Storm duration
 Storm frequency
 Monthly total
 Annual total
 Annual average

ALL HAVE THEIR OWN INDIVIDUAL CARDS
Definition
Term
 Storm depth
Definition
total depth of precip during a storm
( a storm affects soil absorbtion depth)
Term
 Storm intensity
Definition
Depth per length of time( depth/lenth of time of storm)
Term
 Storm duration
Definition
length of time of a storm
Term
 Storm frequency
Definition
how often a storm of particular duration occurs
Term
 Monthly total
Definition
Monthly Total: Defines climate.
Term
 Annual total
Definition
Annual Total: Defines climate.
Term
 Annual average (end of individual term efects)
Definition
Annual Average: Defines climate.
Term
o How/why do precipitation statistics vary over time and space?
Definition
Proximity to oceans, humidity, temperature, topography, global circulation
Seasonal Snow Cover: High latitudes and high elevations
Term
o Where do you find seasonal snow cover?
Definition
locations where snow lasts though the winter, found at high latiduteds* ex poles, and high elevations*

2. PERMANENTLY SNOW COVERED REGIONS form glaciers->moving!! (compacted snow-->ice!
Term
o Define snow water equivalent, and describe how it can be measured
Definition
SWE depth of liquid water in snowpack.

Measure it to predict stream flow for the next year,
done using

1. Snow pit. Done near peak snow.
How? Measure mass (known volume), figure out Volume of core
Density of water=1000kg/m^3 or 1g/cm^3
(Density of ice Density of aged snow=500kg./m^3
Density of fresh snow=100kg/m^3

or

2. Snow Pillow. Pad in the middle of high forest open ground, viscous fluid inside, as snow accumulates it keeps track then relate mass to SWE


Depth of liquid water in snow pack. It can be measure by knowing the density of water and density of snow and taking out wedges from the snow. Snow Pillow helps forecast.
Term
o Define interception and the factors that affect it
Definition
Part of the precipitation does not hit the ground because it his caught first by tree branches or litter or forbs, shrubs grasses ect. It is hard to quantify but trees release their interception as throughfall or stemflow.
According to the graph, highest percent precipitation intercepted is alfalfa crops 36%, Coniferous forests 28%, Grasses 10-20%, Corn 16%, Deciduous forests 13%, Oats 7%.


Precipitation that does not reach the soil, but is instead intercepted by the leaves and branches of plants and the forest floor.
Affected by: Vegetation
Term
EVAPOTRANSPIRATION
Definition
Latent heat flux over land surfaces.
Term
o Define the land surface energy budget, and explain how it relates to evapotranspiration
Definition
How Available energy (Rn)(net radiation) is used at the lands surface
Rn=LE+H+G
1. LE- Latent heat flux (amount of heat that GOES INTO A PHASE CHANGE OF WATER) ex evaporation *Laten heat flux AKA Evapotranspiration ET!!
2. H- Sensible Heat flux (Energy to HEAT AIR coming from the LANDS SURFACE) ex pavement radiation heats you and the air around it
3. G- Ground heat flux (Energy to heat the ground)

EXAMPLES
-Almost all Rn is used for LE (in open water!) (Irrigated crop! Because it has plenty of water most of the net radiation is used for LE)
-Rn used for H, no water available for LE (paved surface)
-Available water used for LE, Rest of Rn becomes H or G ( SHRUBS AND GRASSES because when they transpire, they evaporate water out of their leaves to photosynthesize)

ONE MORE EXAMPLE
Grass that is well watered- most of Rn used in LE (latent heat flux ) irrigated
Grass that is not well watered- plants cant transpire, lower LE
Term
o What atmospheric factors affect potential evapotranspiration?
Definition
Evapotranspiration: Latent heat flux over land surfaces.
Potential Evapotranspiration (atmospheric factors affecting): Available energy (net radiation), humidity (HIGH HUMIDITY IS LOW ET), wind (INCREASES ET) transports water vapor.
Term
o What is the difference between potential and actual evapotranspiration?
Definition
Difference between Potential and Actual Evapotranspiration: Potential ET is the amount of ET if water is unlimited and actual ET is the amount of ET given the amount of water available. PET depends on available energy (net radiation), humidity, wind. Actual ET depends on soil drying (limits movement through water pores), plants (open/close stomata to control water loss)
Term
Subsurface Flow
Definition
Term
Definitions: INFILTRATION, PERCOLATION, REDISTRIBUTION, UNSATRUATED ZONE, SATURATED ZONE, WATER TABLE, CAPILLY FRINGE, RECHARGE, AQUIFER, AQUICLUDE, UNCONFINED, CONFINED, POROSITY, MACROPORE, TEXTUE,
Definition
Term
Infiltration
Definition
Water moving from surface to subsurface, passage of water through the land surface into the subsurface or unsaturated vadose zone
Term
Percolation
Definition
DOWNWARD movement of water
Term
Redistribution
Definition
movement of water IN ANY DIRECTION
Term
Unsaturated zone
Definition
Part of the Subsurface where pores aren't completely filled with water,
VADOSE ZONE. inbetween surface an zone of saturation
Term
Saturated Zone
Definition
pore spaces completely filled with water, ground water-water in the saturated zone. NOT a big underground lake
Term
Water Table*
Definition
in between vadose(unsaturatedzone)and saturated zone.
Top of saturated zone (ground water)
Top surface of saturated zone, below is water, groundwater
Term
Capillary Fringe
Definition
Ability of liquid to flow in narrow spaces in opposition to gravity.
HIGHEST with small pores, in clay
LOW in sand
Term
Recharge
Definition
where infiltrating and percolaing water raises the water table, good graph on page 6 of notes for 3B feb 2
Term
Aquifer
Definition
Medium that can easily transmit water, a loam (sands)

-not free flowing as youd see ina river
-water flowing throughthe pore spaces of different types of materials
Term
Aquiclude
Definition
(aquitard) Medium that is a barrier to waterflow, Silts CLAYS at bottom f lake WALL!!!
Term
Unconfined*
Definition
unfonfined aquifer, in the saturated zone below the water table but above the rock barrier aquiclude that seperates it from the confined aquifer below

connected to surface waterand atmospher
-material that easily transmits water
Term
Confined*
Definition
disconnected from atmosphere due to an impeeding layer (aquiclude or aquitard!)
Term
Porosity
Definition
Volume of pore (void) space/total volume. Large/connected means it will be easy to flow and more storage space.
Term
Macropore
Definition
Increasing infiltration, holes in soil that are much bigger than ones we looked at before, lead to “preferential pathways, and Preferential flow of water” created by root holes, worm, animal burrowing, soil cracking.
Term
Texture
Definition
Combination of particle sizes in a porose medium. Loam = good for drainage.
Term
o What properties of a soil affect the storage and flow of water?
Definition
Texture, structure, pore space, field capacity/wilting point, rain intensity, vegetation, soil wetness, infiltration.
Term
o What soil and land cover conditions favor low/high infiltration?
Definition
Integrating factors for infiltration
1. affected by general soil texture and macropores and structure
2. affected by soil wetness, how much water is already there

high infiltration
-high for Coarse material like SAND
- if you have macropores
-Land surface roughness, vegetation, if it is more rough it holds water longer, more infiltration
ex. on vegitated surface, carse soil particles, macroores, dense vegetation or surface litter layer


Low infiltration,
-Fine soil particles,
-on road,
-few macropore, low vegetation, surface compaction EX compacted road surface
- if you already have saturated soil, a higher rain intensity will have low infiltration because the soil cant take anymore on at that point.
Term
o What types of materials make good aquifers, and why?
Definition
Coarse sediments, fracured or soluble bedrock, water not free flowing but flowing through pore spaces of different types of materials
Term
o What is the difference between a confined and an unconfined aquifer?
Definition
Confined is an aquifer that is connected to surface water and atmosphere whereas the unconfined is disconnected from the atmosphere due to an impeding layer.
Term
RUNOFF
Definition
Water that reaches a stream by ways ofthe 4 potential pathways.
Term
o What are the potential pathways for water to reach a stream?
Definition
FOUR POTENTIAL PATHWAYS (Mechanisms)
1. Infiltration Excess
2. Saturated Overland Flow
3. Shallow Subsurface Flow
4. Groundwater Flow

1. Horton, oerland flow, water that flows on lands surface because RAIN INTENSITY is greater than INFILTRATION RATE
2. water that flows on lands surface because GROUND WATER is SATURATED. Ground water table has risen to the surface
3. Flow through/near the surface layer, SLOWER, usually with high organic matter or MACROPORES
4. Water that travels SLOWLY through the saturated zone. Supplies the BASEFLOW(low flow) in streams.
Term
o Explain which types of land surface and soil conditions favor infiltration excess overland flow.
Definition
Overland flow- flowing on the land surface due to infiltration or saturation excess
Subsurface flow- in permeable surface layers or through unconfined aquifers
Saturation overland flow in seeps or springs,
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