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<br />. <br /> <br />. <br /> <br />-, <br />I <br /> <br />GLEN CANYON ENVIRONMENTAL STUDIES <br /> <br />October ~-11. 1989 <br /> <br />RESEARCH PLAN <br /> <br />On October 6 (1 AM) to Midnight October 9, 1989 the release from <br />Glen Canyon Dam into the lower Colorado River will be a constant <br />5000 cfs. During this period. the Glen Canyon Environmental <br />Studies plans on carrying out a ser~es of research projects that, <br />if done at a constant flow, will give information that is <br />unattainable at the present low and fluctuating flows result~ng <br />from dam operations. <br /> <br />The following research plan gives a br~ef summary of the projects <br />that will be accomplished dur~ng th~s per~od. In most cases, <br />these projects are backed up with more detailed proposals <br />prepared by the particular research group. These proposals are <br />attached as appendices to this plan. <br /> <br />A. Research from Glen Canyon Dam to Lake Mead <br /> <br />Aerial Phctoorachu <br /> <br />Objectives: <br />Compare stream geomorphology and the consequences of <br />fluvial process between 198~, when aerial photos were <br />taken at 5000 cfs. and 1989. <br /> <br />Map beach and gravel bar areas at 5000 cfs for use <br />in determining beach changes and surfaces <br />available for trout spawning. <br /> <br />Identify Cladophora distribution in upper reaches <br />of the mainstem. <br /> <br />Develop appropriate mapping procedures to be used <br />for resource identification and possible <br />application to GIS. <br /> <br />Justification: <br />Aerial photos were taken in 198~ at flows of 5000 <br />cfs, thus the present constant flow will allow <br />comparison of many features along the river. <br />These include, primarily, features related to <br />stream hydrauliCS and fluvial processes such as <br />beaches and bars. It is believed that these <br />features have changed and continue to change as a <br />result of the present releases from the dam. By <br />comparing two points in time with the same flow <br />regime, estimates of the changes can be made. <br />Cladophora, a medium for food sources for some of <br /> <br />1 <br />