GSA Today Archive |
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GSA Today, v. 9, no. 4, April 1999
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Table of Contents
Science Article: (View Abstract)
Floods and Sandbars in the Grand Canyon
by Ivo Lucchitta, Luna B. Leopold
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also ...
| 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 |
D1 |
| 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
ABSTRACT
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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