Geomorphic and Sedimentologic Investigations June 2002
of the Middle Rio Grande Between Cochiti Dam
and Elephant Butte Reservoir
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Summary of the Geomorphology of the Middle Rio Grande | |||
The geomorphology and sedimentology of the Middle Rio Grande between Cochiti Dam
and Elephant Butte Reservoir have been investigated to: (1) evaluate the
historic and present characteristics of the river, (2) identify the natural and
human-induced factors that control the present day river characteristics, and
(3) evaluate existing opinions regarding the causes of channel narrowing,
armoring of the bed and incision of the river. The investigation was based on a
review of published and unpublished literature and data, and limited aerial and
field reconnaissance. The Middle Rio Grande can be subdivided into 9 reaches
based on the spatial distribution of historic sediment storage zones within the
valley, and their geomorphic and geologic controls that include bedrock
outcrops, active tectonic uplift (Belen-Socorro Uplift) and tributary alluvial
fans (Tables 1 and 2). Changes in the hydrology and sediment supply to the Rio
Grande following construction of the flood and sediment control dams in the
1970s have been used to explain changes in channel morphology, such as planform
change, channel narrowing, channel incision, and changes in bed material
composition and channel armoring (Crawford et al., 1993; Graf, 1994; Lagasse,
1994; Baird, 1989, 2001). However, because of the length of time over which
changes have been on going (since at least the 1800's), as well as the wide
range of physical changes that have been imposed on the system, there is a very
real possibility for confusion regarding cause(s) and effect(s).
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Figures: | |||
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Figure 4.8 - Comparative longitudinal profiles of the Middle Rio Grande based on photo-interpreted bed elevations from 1962, 1972, and 1992. | |||
| Web Page Last updated: 10/31/2002 | ||||
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Appendix: | |||
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Appendix A: Field Photographs of the Middle Rio Grande: Aerial photographs were taken on March 15, 2001, and ground photographs were taken at various times in 2001 | |||
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Appendix B: Bibliography | |||
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Appendix C: Comparative Stationing, Mussetter Engineering, Inc. Station Line and U.S. Bureau of Reclamation River Miles | |||
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