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<br />OD~292 <br /> <br />This is also used to display changes in a given parameter with depth at the forebay station over a <br /> <br />sequence of time. These three-dimensional analyses form the primary basis for describing water <br /> <br />quality patterns in the reservoir. <br /> <br />IV. Results <br /> <br />A. Lake Powell <br />1. Introduction to Limnology <br /> <br />Interpreting the trends and history of Lake Powell's requires the grasp of some basic <br /> <br /> <br />limnological principles as well as some specifics peculiar to Lake Powell (Wetzel 1975, Cole <br /> <br /> <br />1994). There are a few components that drive the seasonal and yearly patterns of the lake; <br /> <br /> <br />resulting in fairly predictable horizontal and longitudinal stratification (Figs. 1,2a, 2b, 3a and 3b; <br /> <br /> <br />Merritt and Johnson 1979, Gloss et al, 1980, Edinger et al. 1984, Stanford and Ward 1986, Potter <br /> <br /> <br />and Drake, 1989, Thorton et al. 1990). <br /> <br /> <br />It is important to first become familiar with the most common and pertinent limnological <br /> <br /> <br />terminology, then to build an understanding of the basic processes that drives the conditions <br /> <br /> <br />found in the reservoir. Only then can valid conclusions be drawn that differentiate inflow <br /> <br /> <br />processes from discharge dynamics. <br /> <br />a.' Stratification: <br />1) Vertical Stratification <br />Lakes exhibit vertical stratification based on density gradients. (Fig. 1) <br />Epilimnion: The surface layer of the lake characterized by the least dense water resulting <br />from warmer temperatures and lower conductance. It is the most biologically active portion of the <br /> <br /> <br />lake due to light availability and higher oxygen concentrations. <br /> <br /> <br />Metalimnion: A boundary or steep gradient between the epilimnion and the hypolimnion. <br /> <br />03/06/98 <br /> <br />DRAFT <br /> <br />Page 16 of62 <br />