Section Name EXERCISE 42 PROBLEMS-PARTI The following questions are based on Map

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Section Name EXERCISE 42 PROBLEMS-PARTI The following questions are based on Map T.7, the ands National Park, Utah" topo- map (scale 1:62.500: contour interval 80 Figures 32-3 and 42-2, stereograms of this region and Figure 42-la. an oblique aerial photograph of this area. The map. Canyonlands and photograph show the deeply entrenched meanders of the Green River north of National Park, Utah (38 33'40"N. 110 03'16"W). 1. How deep is the gorge of the Green River? Use the top of the inside Bend" as your upper reference point (determine the relief, not the elevation). feet 2. (a) Describe where a cutoff meander developed in the past describe the location rela- tive to labeled places on the map). (b) Did the cutoff occur before or after the entrenchment began? (c) How do you know? 3. (a) Describe where another cutoff meander might develop in the future (describe the location relative to labeled places on the map). (b) How high is the land between the two loops of the river feet at this point? (Determine the relief, not the elevation.) 4. The gorge wall on the outside of some meander turns is noticeably steeper than the gorge walls on the inside of the meander tum. For example, see "Cottonwood Bottom" and the meander to the west of "Spring Canyon Point." What might explain this? (Hint: Consider the processes of erosion associated with both meandering and entrenchment; before entrenchment, was the stream course directly above its current location?) 293 Copyright C 2017 Pearson Education. Inc.

Explanation / Answer

1.) Taking Bowknot Bend as the reference line The Green River is 300-1500 feet depth.

2.(a) The first cutoff meander is developed near the spring canyon than to bowknot bend the reason for the tight bends in the Green River is the same as it is for the Mississippi, River courses often wind over time when they flow across a bed of relatively soft sediment in a floodplain. It is assumed that the Green River, before its present canyon phase, once snaked across a wide valley on a bed of its own sediment and made a series of striking meander bends. Vertical uplift of the entire landscape—by deep-seated tectonic forces related to the growth of the Rocky Mountains—caused the Green River to erode downwards into the hard rocks under the valley. In the process, the present vertical-sided canyon was formed, preserving the tight loops reminiscent of an earlier time.

2. (b) The cut off occur before the before the entrenchment  

2.(c) It is evident from the figure given that at key point and spring canyon on opposite side the cutoff took place before that as on the bed of its own sediment and striking meander bends started taking place.

3.(a) There is very rare chances that cutoff meander will again form but if it will be formed again it would be at canyon point.

3 (b) The Land is around 300-1500 feet high on the side of the river

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