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<br />A <br /> 22000 -, , ---,------------, ,- <br /> ill ill <br />1joo 00 00 <br /> i1i <( <br />al!! ~ ill <br />o '" 20000 -J -J <br />a.1i5 E ill ill <br />o ~ a: a: <br />C\J::l z <J) <J) <br />w<( 0 - U <br />>2 :>- 18000 - ~\ 0 <br />O~ 2 0 <br />(Xl a: <( 0 <br /><(w () <br />01-;- W " <br />Z() -J L <br /><(Z (Xl 16000 i <br />000 a: 1 <br />u. -J <( r <br />O-J ~ r <br /><( -J Z f <br /> <( - <br />W 14000 t <br />a:!;i: <br /><( 12000 l <br /> L L-- --L-_ <br /> 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 <br /> YEAR <br />B <br /> 26000 <br />.l!1 ill <br />u 00 <br />000 24000 <( <br />oW W <br />01- C -J <br />oUi E ill <br />C\J _ a: <br />w~ z 22000 CIJ <br /> - <br />e;z ~ ~\ <br />!Xl~ z 20000 <br /><( a: <( <br />OW () <br />zl-;- ill '<t <br /><( () -J 18000 <br />ooz !Xl <br />u.0 a: <br />O-J <( <br />w-J ::2 16000 <br />::2..J z <br /> <( - <br />::l <br />..J!;i: <br />~ 14000 <br /> 12000 _-1-_ L:.......-_--L- <br /> 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 <br /> YEAR <br /> <br /> <br /> <br />Figure 1. Changes in sand-bar surface area and volume at all II long-term Northern Arizona <br />University study sites in Marble Canyon, A, Surface area of sand bars decreased by 22% from <br />1991 to 1999 despite temporary increases caused by high releases in1996 and 1997_ B_ <br />Volume of sand bars in 1999 was 2-3% greater than in 1991. <br /> <br />6 <br />