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<br /> <br />01962 <br /> <br />UNITED STATES <br />DEPARTMENT OF THE INTERIOR <br />GEOLOGICAL SURVEY <br /> <br />RECE!\j~!. , <br />JAN 02 2004 <br /> <br />OoIol1ldo Wale, Consel'lation Board <br /> <br />GCMR - 74U <br />ADM - LlO <br /> <br />MEMORANDUM <br /> <br />[1 2 27 0 3 <br /> <br />TO: <br /> <br />SUBJ: <br /> <br />Glen Canyon Dam Adaptive Management & Technical Workgroup <br />Representatives and Science Advisors ~ <br /> <br />Ted S, Melis, Integrated Science Program Manager, SBSC, GCMRcj/I/ <br /> <br />Distribution of IAHS Red Book article on use of L1SST for monitoring <br />suspended-sediment transport in the Colorado River Ecosystem below <br />Glen Canyon Dam <br /> <br />FROM: <br /> <br />The attached article, Testing laser-based sensors for continuous in-situ monitoring of <br />suspended sediment in the Colorado River, Arizona, by Melis et a!., has recently been <br />accepted for publication by the International Association for Hydrological Sciences <br />(IAHS) within its Red Book series volume entitled Erosion and Sediment Transport <br />Measurement in Rivers: Technological and Methodological Advances. <br /> <br />.-- <br /> <br />These tests have been carried out within the context of recent research efforts undertaken <br />as part of the ongoing suspended-sediment mass balance monitoring and research project. <br />The objective of these L1SST tests was to determine whether existing laser-based <br />instruments could provide high-resolution, real-time suspended-sediment transport data <br />from the Colorado River related to diurnal operations at Glen Canyon Dam, Such high <br />resolution data are critical to addressing issucs. oi.fme-sediment transport and <br />conservation relative to hourly-to-daily changes in releases from the dam. <br /> <br />This report describes the initial test results obtained from the Laser In-Situ Scattering and <br />Transmissometry (LISST) instnunents in 2001 and 2002, while deployed at the Grand <br />Canyon suspended-sediment monitoring site near Phantom Ranch. On the basis of these <br />results and data from later tests, the LISST instnunents have been shown to provide a <br />critical role in continuous monitoring of suspended-sediment transport in the Colorado <br />River, Continuous monitoring may eventually prove to be of value in determining the <br />optimal duration of sand-bar building high flows released from Glen Canyon Dam under <br />varying sediment-supply conditions. <br /> <br />Please review this article and share it with your staff and other interested parties. Feel <br />free to contact me at (520) 556-7282, with any questions you have regarding these <br />findings, or the published conclusions derived from them. <br />