Exam 1 Highlights - BIOL/EVPP 350 Freshwater Ecosystems Dr....

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BIOL/EVPP 350 Freshwater Ecosystems Exam guide: A few highlight to help you study Dr. Kim de Mutsert Fall 2011
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Lecture 1 What is limnology? Why is it important? Bb reading: Summary. Freshwater Ecosystems: Revitalizing Educational Programs in Limnology.
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The Global Hydrologic Cycle - Ch. 11, p 272-277 - Hyperlinks in lecture 1
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Lecture 2A: Lake Origins The lake basin is the “bowl” or depression that contains the water Lake basins are formed by numerous processes, the principal being: 1.Glacial activity 2.Tectonic/Crustal movement 3.Volcanic action 4.Solution processes 5.Fluviatile/riverine processes 6.Animal/human activity Main reading: Ch. 11, p. 277-
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Lecture 2B: Lake Morphometry Main reading: Ch. 11, p. 265-267 Morphometry is the quantitative description of the shape and size of lakes - Shore length - Area - Depth - Volume It defines a lake’s physical dimensions and involves the quantification and measurement of lake basin shape These dimensions influence the lake’s water quality, productivity levels and habitat quality
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Shoreline Development Index A ratio of the measured shore length to the minimum length possible of a lake with the same area = the circumference of a circle with the same area: SDI = L/(2√Aπ) L = shoreline length A = lake area One measure for habitat complexity: A higher SDI provides better habitat for fish
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Areal characteristics: % littoral area The littoral (shallow near shore) zone is the portion of a lake where sufficient light can penetrate to the lake bottom. It is also sometimes defined as that portion of the lake that is less than 15 feet in depth. The littoral zone is where the majority of the aquatic plants are found and is a primary area used by young fish.
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Watershed The area of landscape that contributes to the water supply of a lake Used in areal characteristic: The ratio of watershed area to lake area A w /A o Used as one indication of potential nutrient loading
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Bathymetric map with morphometric parameters
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Ice Lake Hypsographic Curve 0 2 4 6 8 10 12 14 16 18 0 2 4 6 8 10 12 14 16 18 Area (hectares) depth (m) Maximum depth Lake bottom What is the area of the lake if the water level would drop by 2 meter?
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Lake Water Budgets - A list of all inputs and outputs of water Once known, the residence time (years) and flushing rate (yr -1 ) can be estimated 35 % 32 % 27 % 73% 32 % Lake Wingra Surface inflow Precipitation Evaporation Surface outflow Net groundwater
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HRT: Calculation and Importance A lake’s residence time is calculated by dividing the lake’s volume by its average annual water outflow. Lake managers calculate outflow on an annual basis so that seasonal variation doesn’t unduly influence results. HRT is needed to determine annual lake budgets for
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This note was uploaded on 01/23/2012 for the course BIOL/EVPP 350 taught by Professor Kimdemutsert during the Fall '11 term at George Mason.

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Exam 1 Highlights - BIOL/EVPP 350 Freshwater Ecosystems Dr....

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