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 GSA Today, v. 9, no. 4, April 1999


Table of Contents

Science Article: (View Abstract)
Floods and Sandbars in the Grand Canyon
by Ivo Lucchitta, Luna B. Leopold

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In Memoriam 2
Memorial Preprints 2
Environment Matters — Enhancing Integrated Science: The Leadership Imperative 3
SAGE Remarks — Seismology and Education: The IRIS Education and Outreach Program 8
Call for Nominations: Farouk El-Baz Award for Desert Research 10
New Service for Geology and Bulletin Authors 10
Washington Report — The Debate about a National Institute for the Environment 11
Cordilleran Section Meeting Field Trips, May–June 1999 12
Center Section —
1999 GSA Annual Meeting in Denver: Call for Papers
Letter 14
Environmental & Engineering Geoscience Contents 16
Bulletin and Geology Contents 18
GSAF Update 19
Future GSA Meetings 20
1999 GeoVentures 21
Calendar 22
Classifieds 23

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Floods and Sandbars in the Grand Canyon
by Ivo Lucchitta, Luna B. Leopold

Erosion of sandbars and beaches in the Grand Canyon National Park downstream from Glen Canyon Dam has become a major problem that needs to be addressed. Geomorphic and geologic mapping provide a link between sandbar elevations and discharge measurements. This link allows an estimate of discharges that will deposit sand far enough above normal high water to prevent frequent depletions by erosion. The sand is needed to protect habitats and archaeological sites and to maintain beaches used by recreationists. It is proposed that when the Little Colorado is in flood, discharge at Glen Canyon Dam be increased to bring the total discharge to the desired high value. Analysis of the flow records show that such opportunities are presented on the average once in eight years, suggesting that the proposal has a reasonable chance of success.

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