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Chapter 15,17,18
test
67
Environmental Studies
Undergraduate 2
11/16/2011

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Term
Recharge
Definition
G' water Replinishment by infiltrated rain. Rainfall infiltrates downward to aquifer. Similar to drainage basins. May come from miles away beneath several surface watersheds for deeper ones. Wells are drilled into the zone of saturation, i.e., the aquifer. This may be a sand or gravel bed or perhaps a fracture zone in a crystalline (igneous or metamorphic) or sedimentary rock, or even saprolite, in some cases.
Term
Hydritic Soil
Definition
Develops with long term water saturation. Soils in which the upper 12 inches is water saturated for more than 1/8th of the growing season.
Term
High Velocity rough bottom
Definition
causes of turbulent stream flow. Mountain stream- high gradient down stream. 1.High energy 2. High oxygen 3. Low temp = low biodiversity.
Term
Dendritic steam pattern
Definition
random treelike stream system
Term
Stream Gradient
Definition
elevation change per unit distance (feet/mile) related to local topography & largely determines speed velocity. Limit to downward erosion. When base level rises upstream the gradient decreases= deposits sediment load. When base level drops downcutting occurs.
Term
Meanders, natural levees, cutoffs
Definition
characteristics of low gradient rivers. Found in locations with low gradients with wide flood plains. Low gradient rivers.
Term
Lotic
Definition
flowing water eco systems. examples: Creeks, rivers
Term
Wetland Hydrology
Definition
Can occur in upland areas with clay rich soils (like gpc campus).poorly drained, with retained sulfur and methane.Can occur on flood plains, hilltops on rare occasions when excessive clay will not allow drainage. On floodplain a wetland may not be next to a creek or river.
Term
Roundness of stream pebbles
Definition
Is related to stream transport distance and mineral hardness. Sediment size is related to water energy. ex. angular/sub-rounded pebbles.
Term
Mature Lake
Definition
contains large number of small ecosystems
Term
Limnic
Definition
standing water ecosystems. examples – ponds, lakes, swamps, marshes, various wetlands types
Term
Braided Stream
Definition
"Over-silted" stream. Too much sand.
Term
Rock breakage by faults, joints, fractures
Definition
facilitates erosion of streams/rivers. Joints and fractures can do the same thing.
Term
Aquatic abiotic components
Definition
temperature dissolves oxygen, pH
Water depth
Water energy/gradient (Lotic only)
Water chemistry (dissolved O2, dissolved solids)
Water clarity
Water temperature
Bottom topography and type
Term
Deep, narrow canyons
Definition
Evidence of a rapid base level drop/local uplift
Term
Succession
Definition
Process of lake and land ecosystem change
Term
1st Order stream
Definition
Small stream with local spring source
Term
base level
Definition
vertical limit to downcutting
Term
watershed
Definition
Topographic basin that catches rainfall
Term
stream sediment sizes
Definition
related to water energy
Term
youthful stream characteristics
Definition
High gradient v shaped valleys (slide 8)
Term
Littoral ecosystem
Definition
shallow shelflike lake ecosystem with plants. Must be close to surface, protects smaller creatures against larger creatures and is a nursery area.
Term
cutbank erosion
Definition
erosion on the outside of a meander bend
Term
water table
Definition
top of underground water saturation zone. Is usually not flat. Is a subdued replica of a ground surface. Less recharge area on top of a hill and that means a higher chance of well drying out. As surface water streams have a gradient so does this. Ground water flows in a general direction as ground slow down stream.
Term
weather
Definition
short term rainfall and temp. events
Term
el nino
Definition
periodic changes in pacific circulation. May be driven by Solar activity. Under normal conditions: NE and SE trade winds combine to form E to W moving winds along Inter-Tropical Convergence Zone across Pacific Ocean. Every 3 to 7 years, these winds weaken.
Term
rain shadow effect
Definition
the primary cause of north american deserts. Opposite side of orographic
Term
Diurnal temp. variation
Definition
difference between night and day temps. Greenhouse effect shields earth from excessive variations.
Term
cirrus
Definition
wispy high altitude clouds
Term
nitrogen
Definition
most common atmospheric gas which is composed of 78%. Important atmospheric functions include shielding earths surface from UV, x-rays, cosmic rays from space while allowing visible and infrared wavelengths to penetrate atmosphere.
Term
hadley cells
Definition
vertical atmospheric circulation driven by equatorial heating. Vertical air movement of cells lead to 1. a persistent low pressure zone at equator ( 0 degrees) 2. Persistent mid latitude high pressure zone at 30 degrees north (across Africa) 3. strong persistent polar high causes polar eastarly
Term
creates monsoon conditions
Definition
Summertime heating of large continents. Generates intense convection that draws warm, moist air inland from Indian Ocean. Orographic lifting caused by Himalayan mtns. results in flooding of ganges river. Flooding issues.
Term
climate
Definition
30+ year average of atmospheric events. Sun provides the energy that drives the Earth’s climate.
Variations in Solar activity and the Earth’s orbit primarily affect this.
Term
low pressure system
Definition
counter clockwise circulation rising air
Term
orographic uplift
Definition
air mass uplift by encounter with mountains. opp. side rain shadow effect.
Term
axial inclination
Definition
condition that causes earth's seasons. Variations in earth's surface temperatures and climate are due to earth's axis in relation to the sun and unequal distribution of land vs. water and differential thermal characteristics of land and water. Seasonal changes happen largely because of this
Term
transpiration
Definition
release of water vapor from trees/plants
Term
troposphere
Definition
lowest layer of atmosphere. "Weather maker". Turbulent, rich in water vapor/droplets.
Term
stratus
Definition
layered clouds
Term
stratosphere
Definition
contains atmospheric ozone, ozone shield. steady wind but little turbulence. Ozone not present as layer but prevalent 10 - 15 ft above earth's surface. Ozone is more dense and effective but unstable. Thinning seems seasonal, greatest in September.
Term
middle latitude high pressure zone
Definition
persistent falling air at 30 degrees latitude
Term
equatorial low
Definition
tropical zone of low pressure convection
Term
rossby regime
Definition
horizontal/ latitudinal wind belts. 0 to 30 degree North – Northeast Trade Winds
30 degree to 60 degree North – Westerlies Wind Belt – Jet Stream
60 degree to 90 degree North – Polar Easterlies
There is interaction between jet stream and polar easterlies.
Term
recipe for rain
Definition
water vapor and condensation nuclei
Term
convection
Definition
air mass uplift by heat
Term
Coriolis effect
Definition
N hemisphere, clockwise ocean circulation. Combined actions of horizontal wind belts and hadley cells and earths rotation leads to this. Clockwise rotation of ocean currents in n. hemisphere. ex. gulf stream carries heat from subtropics northward carries enough to warm NW coastline of north america.
Term
Mammatus
Definition
Udder shaped clouds beneath "supercells"
Term
High pressure system
Definition
clockwise circulation, falling air
Term
Youthful Stream
Definition
No floodplains, high gradient, high energy, low diversity, v-shaped valleys, mature floodplains, moderate gradient, local meanders, greater diversity.
Term
Old Age Stream
Definition
Wide floodplains, low gradient, meanders and related features.
Term
Piedmont Stream
Definition
lower energy/moderate. Drought triggered drop in local base level causing downcutting.
Term
How humans change base levels
Definition
Building dams. As lake fills, the local base level rises upstream. Gradient decreases = deposition.
Term
Ground water (wells)
Definition
Usually "out of sight out of mind" unless our individual home or city depends on one or more wells for irrigation or water supply. Ground water furnishes 50% of US population's drinking water and 25% of industry's needs. Helps to store freshwater that sustains streamflow, after run off effects of the last rain end.
Term
Aquifer
Definition
body of rock or sediment that can hold and transmit usable quantities of ground water.
Term
Aquitard
Definition
impermeable zones or layers of rock or sediment that do not pass water easily. Also called "confining" bed.
Term
Surface of Well
Definition
The importance of proper well completion – Apparent lack of near surface grouting and concrete surface pad = potential contamination of unconfined (shallow) aquifer. Coastal plain needs larger surface pad.
Term
Unconfined Aquifer
Definition
Aquifer that is “open” to the un-saturated zone, i.e., it is not overlain by an aquitard. The water must be pumped to reach the surface. Is directly recharged by rainfall.
Term
Confined Aquifer
Definition
Overlain by an aquitard and pressurized by "up-gradient" water. Wells into confined aquifer are called artesin wells.
Term
Atmospheric Circulation
Definition
Reason why wind blows. Caused by earth's rotation, uneven distribution of landmass. Properties of heat transfer between air/water/land. Solar energy
Term
Low Pressure Zone
Definition
Air rising counter clockwise. Weather maker. Most favorable for rain/snow.
Term
High Pressure Zone
Definition
Clockwise falling air, fewer clouds. Divergence at surface.
Term
Hydrologic Cycle
Definition
dynamic move-ment of water through the atmosphere, over & below the land surface, through the life cycles of plants and animals, and to and from the oceans & other water bodies.
Components:
Evaporation/Transpiration
Condensation
Precipitation
Runoff/Infiltration
Term
Climate Drivers
Definition
Solar heat Methane
Orbital eccentricity Ocean currents
Axial tilt Ocean heat
Axial wobble Plate Tectonics
Water vapor Continent locations
Water droplets Land elevations
Carbon dioxide Chemical weathering
Vulcanism Bolide impacts
All of these drivers are of differing impact and all are subject to change. Some are random events, some are susceptible to cycles, some are affected by both random events and cycles of activity.
Term
Synergy
Definition
Some climate drivers combine to produce a greater effect.
Term
Antagonism
Definition
Some climate drivers cancel each other out.
Term
Cloud formation
Definition
composed of minute water droplets and/or ice crystals. Components/Processes needed :
Moist air
Condensation nuclei
Uplift mechanism – Convection, Cyclonic, Weather Front, Orographic

localized flooding
Term
Cumulus
Definition
high pressure
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