Reach 3 with migration displayed (Red = 1937-1951, Orange = 1951-1964, Yellow = 1964-1980, Green = 1980-1991, Blue = 1991-2013) Reach 3 annual channel migration from 1937-2013 Reach 3 width change from 1937-2013 Reach 3 sinuosity from 1937-2013 Reach 4 Reach 4 is ~3.6 km rural stretch of river that is abnormally straight in terms of the reach upstream and downstream of it, the study area overall, and naturally meandering rivers in general. There has been some migration observed in this reach but has been contained to the east side of the valley. Width has increased in this reach but not as dramatically as other reaches. Since the channel is so straight in this reach, a sinuosity just above one has been observed over the record of time. Despite the river being so straight over a 76 year period of time, the oxbow lake observed in the south-west portion of the reach shows this straight channel has not always been characteristic. Based on the LiDAR an initial hypothesis that this stretch of river is being pressed up against the east valley wall by a large alluvial fan from a large sediment laden tributary (Barney Fry Creek) entering from the west side of the valley. Reach 4 with migration displayed (Red = 1937-1951, Orange = 1951-1964, Yellow = 1964-1980, Green = 1980-1991, Blue = 1991-2013) Reach 4 annual channel migration from 1937-2013 Reach 4 width change from 1937-2013 Reach 4 sinuosity from 1937-2013 Reach 5 Reach 5 is approximately the same stream length as Reach 4 but juxtaposes the former reach in planform characteristics. This reach is highly active in terms of channel migration, with significant width increase, and a sinuosity between 1.5-1.7 and two cutoffs over the record of time. If the prior zone in being controlled by an alluvial fan this area could mark the transition away from that control allowing the river to react in a highly dynamic way much like Reach 2 from Reach 1.
Reach 3 with migration displayed (Red = 1937-1951, Orange = 1951-1964, Yellow = 1964-1980, Green = 1980-1991, Blue = 1991-2013) Reach 3 annual channel migration from 1937-2013 Reach 3 width change from 1937-2013 Reach 3 sinuosity from 1937-2013 Reach 4 Reach 4 is ~3.6 km rural stretch of river that is abnormally straight in terms of the reach upstream and downstream of it, the study area overall, and naturally meandering rivers in general. There has been some migration observed in this reach but has been contained to the east side of the valley. Width has increased in this reach but not as dramatically as other reaches. Since the channel is so straight in this reach, a sinuosity just above one has been observed over the record of time. Despite the river being so straight over a 76 year period of time, the oxbow lake observed in the south-west portion of the reach shows this straight channel has not always been characteristic. Based on the LiDAR an initial hypothesis that this stretch of river is being pressed up against the east valley wall by a large alluvial fan from a large sediment laden tributary (Barney Fry Creek) entering from the west side of the valley. Reach 4 with migration displayed (Red = 1937-1951, Orange = 1951-1964, Yellow = 1964-1980, Green = 1980-1991, Blue = 1991-2013) Reach 4 annual channel migration from 1937-2013 Reach 4 width change from 1937-2013 Reach 4 sinuosity from 1937-2013 Reach 5 Reach 5 is approximately the same stream length as Reach 4 but juxtaposes the former reach in planform characteristics. This reach is highly active in terms of channel migration, with significant width increase, and a sinuosity between 1.5-1.7 and two cutoffs over the record of time. If the prior zone in being controlled by an alluvial fan this area could mark the transition away from that control allowing the river to react in a highly dynamic way much like Reach 2 from Reach 1.
FinalReport-InvasiveCarpWorkplanFinal%20%281%29.docx