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Lake Morphometry and Field Techniques

Lake Morphometry and Field Techniques - Lake Morphometry...

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Lake Morphometry and Introduction to Field Study of Lakes Lecture 2B Fall 2011 BIOL/EVPP 350 Freshwater Ecosystems Dr. Kim de Mutsert
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Morphometry 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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Working with a bathymetric map A lake map with contour lines is a bathymetric map The lines are called isobaths (connect same depth) Many lakes have already been mapped and a good map will contain the following: name, county, and geographic location of the water body an outline of the shoreline drawn to a known scale depth contours drawn to a known interval geographic orientation (which way is north?) date of map and data collectors
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Areal characteristics meters feet Fetch Max width Max length % (ratio of meters/feet) meters feet meters feet hectares (ha) acres (ac) meters feet units elevation Shoreline development index (SDI) Shoreline length (L) Littoral Area maximum depth (z max ) surface area (A o ) characteristic A surface map allows determination of these areal characteristics
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Areal characteristics Maximum length (fetch) Maximum width Z max Several areal characteristics and measurements can be taken directly off the bathymetric map
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Surface area: grid method You’ll need: Bathymetric map Grid paper Method: Count up the number of squares that fall within the shoreline of the lake Use the map scale to determine area represented by each square scale Area = # squares counted X area of one square
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Volumetric characteristics Bathymetry also allows determination of several volumetric characteristics years Hydraulic residence time (HRT) Graph (depth vs volume) Volumetric curve Graph (depth vs area) Hypsographic curve meters feet Mean depth (z mean or z) Cubic meters acre feet Stratum volume Cubic meters acre feet Volume (V) units characteristic
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Volume Calculated by:
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