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9 <br />Maps were made of 235 km of channel between the Colorado River confluence and <br />the downstream end of Split Mountain Canyon. This is about 44 percent of the entire <br />river channel between these two points. Mapped segments were about 16 km long and <br />were evenly spaced along the river. Maps developed from aerial photographs were <br />digitized into a geographic information system. Map scale and distortion were adjusted <br />using an array of co-located points on photographs and topographic maps. Shoreline <br />complexity was calculated from these data and are reported by 16-km reach. Estimates <br />of shoreline complexity in unmapped reaches were made by (1) geomorphic <br />classification of the channel pattern of each 16-km segment of the study reach, and (2) <br />applying the mean shoreline complexity values for a particular channel planform to that <br />reach. <br />The implications of the longitudinal distribution of shoreline complexity on the <br />distribution of larval Colorado squawfish was evaluated with a simulation model of larval <br />drift developed using the commercially-available graphical simulation program STELLA <br />11 (High Performance Systems Inc., 1994). The modeled segments were those within <br />200-km downstream from the Yampa River because the spawning characteristics of the <br />population in the Yampa River are known. The model and its components are described <br />below. <br />RESULTS <br />Channel Planform <br />The Green River consists of a series of linked segments of three channel planform <br />types; there is no systematic downstream change from one planform to another. The <br />channel planforms are restricted meanders, fixed meanders, and canyons with abundant <br />debris fans. Restricted meanders only occur where the channel crosses erodible shale