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<br />1302293 <br /> <br />Hypolimnion: The dense, cold, saline water at the bottom of the lake. It is fairly stable and <br /> <br />resistant to mixing. It is dark and has low oxygen levels; consequently bacteria tend to be the <br />dominant life form. <br /> <br />Thermocline: A thermal boundary or gradient between water masses of different. temperature. <br /> <br />Chemocline: A chemical boundary or gradient between water masses of different salinity. <br /> <br />Meromictic: A condition of persistent high salinity in the hypolimnion that resists mixing <br /> <br />because of a strong chemocline. <br /> <br />Hypoxia: 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 />Horizontal or longitudinal stratification gradients are generally a reflection of the distance <br />from the riverine inflow. <br />Riverine conditions dominant in the reach where the river is still flowing within a channel <br />even though it may be just below the lake level. This condition consistently exists within the <br />Cataract 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 <br />above. <br /> <br />b. Hydrodynamic processes <br />Hydrodynamic processes are those that drive the stratification and mixing of the lake and <br />include: <br /> <br /> <br />Density: The property of denser masses to sink is key to lake dynamics. Temperature and <br /> <br /> <br />dissolved chemicals are the fundamental components that determine density differences. Warmer <br /> <br />03/06/98 <br /> <br />DRAFT <br /> <br />Page 17 of62 <br />