Laserfiche WebLink
<br />0;)2332 <br /> <br />can be generated and stored electronically, but a large quantity of historical data has remained in <br /> <br />hard copy form. During the past seven years, efforts have been made to enter these data into <br /> <br />electronic formats to facilitate data management and analysis. Recently a large project involving <br /> <br />entry of the past 34 years of chemical analyses was completed. <br /> <br />A relational database was designed and implemented in the mid-1980s to store and manage data <br /> <br />from physical profiles and laboratory analyses. This database has under gone several changes and <br /> <br />refinements. Currently available data is now served from an Ingres database management system. <br /> <br />Data is transported from this system to SAS' software (SAS' Institute Inc., 1996) for statistical <br /> <br />analysis, summarization, and graphical representation. Work is currently in progress to move this <br /> <br />database to the Grand Canyon Monitoring and Research Center's Information Technology program <br /> <br />under the Oracle database management system. <br /> <br />C. Data Analysis <br /> <br />Three-dimensional analysis for depicting longitudinal changes through the reservoir and temporal <br /> <br />changes in the forebay was done with Surfer' and Grapher' software (Golden Software, 1996 and <br /> <br />1994), which performs interpolation, gridding, and contouring of three dimension data. With this <br /> <br />software, images may be generated which depict changes in temperature, for example, on a two- <br /> <br />dimensional framework of depth through the water column and distance from the dam, giving, in <br /> <br />effect, a cross-sectional view of water quality conditions throughout the reservoir body. This is also <br /> <br />used to display changes in a given parameter with depth at the forebay station over a sequence of <br /> <br />time. These three-dimensional analyses form the primary basis for describing water quality patterns <br /> <br />in the reservoir. <br /> <br />IV. Results <br />A. Lake Powell <br /> <br />06/02/98 <br /> <br />DRAFT <br /> <br />PaRe 15 of62 <br />