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<br /> <br />400 <br /> <br />r <br /> <br /> <br />F <br /> <br />J. A. STANFORD ET AL <br /> <br />(a) <br /> <br />(b) <br /> <br />1983.1992 <br /> <br />1920-1929 <br /> <br />14000 <br /> <br />12000 <br /> <br />I 10000 <br />u <br />';" 8000 <br />El <br />~ 6000 <br />u <br />II <br />i5 4000 <br /> <br />2000 <br /> <br />o <br /> <br />.. <br />... ... .. .. .. .. ... .. .. .. .. - .. .. .. .. .. .. ... ... - .. .. ...'. ...".. .... .. ... .. .. - ... <br />, ' <br />. ' <br /> <br /> <br />---'.,. .. <br />....... ':...:=.:;;..:.-...-'. <br />- - .. .. - - - - .. ... .. ... -- ... ... " <br /> <br />... .. - - - - - - - - ... .. ~ ~ .. - .. - - - .. .. - -,- .. - - - - - .. .. .. - <br />, .',"" <br />I" ..r, I', t~ ....... <br />.. _ .. _ ~..,j, ".I~~.I.."J: '!I.. ~I_"'" ."..... .. .. - ... <br />I ,If'" ..' I".. "... <br />, .,. '-"',L. -wi ,....., ',.. <br />4#- ':...~'- !'-:: - - - - ~\..~..,,"".'~ - - - - -.. ;'-'...~."'I" <br /> <br /> 400 <br />., 300 <br />E <br />~ 200 <br />III <br />Ol 100 <br />c: <br />III <br />.s= 0 <br />U <br />~ .100 <br />Iii <br />c <br />c: -200 <br />III <br />III -300 <br />:E <br /> -400 <br /> <br /> <br /> 20 <br />III 15 <br />Ol <br />c: 10 <br />III <br />.s= <br />U 5 <br />:.l! <br />0 0 <br />~ <br />Iii -5 <br />c <br />c: <br />III -10 <br />III <br />:E .15 <br /> -20 <br /> <br /> <br />ONDJ FMAMJJAS <br />Water Year <br /> <br />Figure 4. (a) Discharge of the Columbia River, USA, in the Hanford Reach, an eighth-order segment in the piedmont transition (see <br />Figure 2) between Priest Rapids and the confluence of the Snake River, for the period 1920-1929 when no large storage dams were pre- <br />sent upstream. In the top panel the solid line is mean daily discharge plotted for each day of the water year beginning I October and <br />ending 30 September, and the broken line plots standard error. These data were used to calculate average daily change in discharge (mid- <br />dle panel) and average percentage daily change (bottom panel) (b) Same as (a), except data are for the penod 1983-1992, when the flow <br />of the Columbia River in this reach was regulated by Priest Rapids and other dams upstream (derived from US Geological Survey data, <br />Reston, Virginia, USA) <br /> <br />mountain valley floodplains, thereby severing the river continuum, Mass transport dynamics that create <br />instream and floodplain habitats for riverine biota are drastically altered, Flood peaks are eliminated, <br />daily discharges are more variable (e,g, Figure 4) and temperature seasonality may be reduced or lost <br />(Stanford and Hauer, 1992; Blinn et al., 1995). <br /> <br />f <br />I' <br />t< <br />