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<br />10 <br /> <br /> -"'" <br /> u__ <br /> .. .. <br /> ..-- - <br />::> Stand in.. waves or ..-- <br />antidunes I <br /> .... <br /> ."1 ) <br /> ,~o <br /> .V' <br /> T'.zn zone .! -. <br /> . . . <br /> . <br /> . .. 7~- - <br /> ;/ <br />Lowo' ,..,me<dU7 Upper nIlPme <br /> I (P~Jne bed. standln. <br /> WlI'IfOS. antidunes) <br />/ ..,-- ..- <br />. I. .. <br /> f- <br />.1 1=- f- <br />/ <br /> ~ <br /> <br />t;; <br />... <br />~ <br /> <br />~ <br />,,; <br />::> <br />5 <br />< <br />a: <br />" <br />::; <br />::> <br />< <br />a: <br />o <br />>- <br />'" <br /> <br />1,0 <br /> <br />05 <br />1.0 <br /> <br />10 <br /> <br />VElOCllY, IN FEET PER SECOND <br /> <br />RIO GRANDE: NEAR BERNALILLO <br /> <br />At high flows, most sand-bed channels shift from dune bed <br />to plane bed, which reducE~s resistance to flow, incr>~ases <br />velocity, and decreases depth, <br /> <br />Dunes or antidunes can increase total scour depth clue to <br />passage of dune troughs, which effectively lower thE! datum <br />or baseline elevation of channel bottom, <br /> <br />3.13 <br />