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Channel Change on the Santa Cruz River, Pima County, Arizona, 1936-86

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Channel Change on the Santa Cruz River, Pima County, Arizona, 1936-86 Channel Change on the Santa Cruz River, Pima County, Arizona, 1936-86 United States Geological Survey Water-Supply Paper 2429 Prepared in cooperation with the Pima County Department of Transportation and Flood Control District Ico I AVAILABILITY OF BOOKS AND MAPS OF THE U.S. GEOLOGICAL SURVEY Instructions on ordering publications of the U.S. Geological Survey, along with prices of the last offerings, are given in the current- year issues of the monthly catalog "New Publications of the U.S. Geological Survey." Prices of available U.S. Geological Survey publications released prior to the current year are listed in the most recent annual "Price and Availability List." Publications that are listed in various U.S. Geological Survey catalogs (see back inside cover) but not listed in the most recent annual "Price and Availability List" are no longer available. Reports released through the NTIS may be obtained by writing to the National Technical Information Service, U.S. Department of Commerce, Springfield, VA 22161; please include NTIS report number with inquiry. Order U.S. Geological Survey publications by mail or over the counter from the offices given below. BY MAIL OVER THE COUNTER Books Books and Maps Professional Papers, Bulletins, Water-Supply Papers, Tech­ Books and maps of the U.S. Geological Survey are available niques of Water-Resources Investigations, Circulars, publications over the counter at the following U.S. Geological Survey offices, of general interest (such as leaflets, pamphlets, booklets), single all of which are authorized agents of the Superintendent of Docu­ copies of Earthquakes & Volcanoes, Preliminary Determination of ments. 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Maps Maps Only For maps, address mail orders to Maps may be purchased over the counter at the U.S. Geologi­ U.S. Geological Survey, Map Distribution Box 25286, Bldg. 810, Federal Center cal Survey offices: Denver, CO 80225 FAIRBANKS, Alaska New Federal Building, 101 Twelfth Residents of Alaska may order maps from Ave. U.S. Geological Survey, Earth Science Information Center ROLLA, Missouri 1400 Independence Rd. 101 Twelfth Ave., Box 12 Fairbanks, AK 99701 STENNIS SPACE CENTER, Mississippi Bldg. 3101 Channel Change on the Santa Cruz River, Pima County, Arizona, 1936-86 By JOHN T.C. PARKER Prepared in cooperation with the Pima County Department of Transportation and Flood Control District U.S. GEOLOGICAL SURVEY WATER-SUPPLY PAPER 2429 U.S. DEPARTMENT OF THE INTERIOR BRUCE BABBITT, Secretary U.S. GEOLOGICAL SURVEY GORDON P. EATON, Director Any use of trade, product, or firm names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government UNITED STATES GOVERNMENT PRINTING OFFICE: 1995 For sale by the U.S. Geological Survey Information Services Box 25286, Federal Center Denver, CO 80225 Library of Congress Cataloging in Publication Data Parker, John. T.C. Channel change on the Santa Cruz River, Pima County, Arizona, 1936-86 / by John T.C. Parker; prepared in cooperation with the Pima County Department of Transportation and Flood Control District. p. cm. (U.S. Geological Survey water-supply paper; 2429) Includes bibliographical references. Supt. of Docs, no.: I 19. 13:2429 1. Santa Cruz River (Ariz. and Mexico Channels. 2. River channels Arizona Pima County. I. Pima County (Ariz.). Department of Transportation and Flood Control District. II. Title. III. Series: Geological Survey water- supply paper; 2429. GB1225.A6P36 1995 551.48'3'0979177 dc20 94-41169 CIP CONTENTS Abstract.......................................................................................................................................................................................1 Introduction............................................................................................................ Purpose and Scope.............................................................................................................................................................4 Description of the Study Area ...........................................................................................................................................5 Acknowledgments ........................................................_^ Methods................................................................ History of Channel Change ................................................................. Channel Change Prior to 1936...........................................................................................................................................6 Channel Change from 1936 through 1986......................................................................................................................10 Mechanisms of Channel and Arroyo Change ..........................................................................................................................10 Meander Migration...........................................................................................................................................................15 Avulsion and Meander Cutoff.......................................................................................................................................... 16 Meander Migration and Avulsion and Meander Cutoff on the Cortaro and Marana Reaches............................... 18 Channel Widening............................................................................................................................................................21 Bank-Retreat and Stability Mechanisms..................................................................................................................22 Channel Widening on the Canoa Reach ..................................................................................................................24 Vegetational Resistance to Channel Widening on the Cortaro and Marana Reaches.............................................24 Vertical Channel Change..................................................................................................................................................24 Arroyo Change ......................................................................... Chronology of Arroyo Expansion on the San Xavier Reach ..................................................................................27 Arroyo Change on Disturbed Reaches.....................................................................................................................31 Factors that Control the Temporal and Spatial Patterns of Channel Change..........................................................................32 Hydrologic and Climatic Controls...................................................................................................................................32 Flood History....................................................................................................................................................................32 How Characteristics Caused by Different Storm Types..........................................................................................37 Sediment Concentration and Seasonality of Hoods ................................................................................................41 Temporal Variability of Channel Change and Hydroclimatic Factors............................................................................42 1915-29 ....................................................... 1930-59.......................................................................................................^^ 1960-86 .................................................................... Temporal Changes in Resistance to Erosion...................................................................................................................43 Geologic and Topographic Controls on Channel Morphology and Change...................................................................43 Sediment Sources .....................................................................................................................................................44 Location of Consolidated Sediments and Bedrock..................................................................................................44 Large-Scale Topographic Controls...........................................................................................................................46 Small-Scale Topographic Controls...........................................................................................................................47
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