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<br />002334 <br /> <br />Meromictic: A condition of persistent high salinity in the hypolimnion that resists mixing <br /> <br />because of a strong chemocline. <br /> <br />Hvpoxia: Low levels of oxygen associated with bacteriological respiration and chemical <br /> <br />reduction. <br /> <br />Anoxia: The absence of measurable oxygen in a water body. <br /> <br />2) Horizontal Stratification <br /> <br />Horizontal or longitudinal stratification gradients are generally a reflection of the distance from <br /> <br />the riverine inflow. <br /> <br />Riverine conditions dominant in the reach where the river is still flowing within a channel even <br /> <br />though it may be just below the lake level. This condition consistently exists within the Cataract <br /> <br />Canyon reach. <br /> <br />A Transition zone occurs as the river conditions merge with the typical deep lake conditions. <br /> <br />Lacustrine conditions are characterized by pronounced vertical stratification as described above. <br /> <br />b. Hydrodynamic processes <br /> <br />Hydrodynamic processes are those that drive the stratification and mixing of the lake and include: <br /> <br />Densitv: The property of denser masses to sink is key to lake dynamics. Temperature and <br /> <br />dissolved chemicals are the fundamental components that determine density differences. Warmer <br /> <br />water is less dense than cold water (down to 4EC), and pure or "fresh" water is less dense than <br /> <br />water with many dissolved chemicals (reflected by measurements of electrical conductivity or <br /> <br />salinity--terrns used here interchangeably). <br /> <br />Advective Flow: A lateral or pushing current, typically horizontal, driven by the momentum of <br /> <br />an in flowing current. <br /> <br />Convective circulation: As stratified water cools in the fall, the surface becomes denser than the <br /> <br />06/02/98 <br /> <br />DRAFT <br /> <br />, "~e 17 of 62 <br />