EXERCISE 41. U Section EXERCISE 41 PROBLEMS-PARTI on City, Tennessee-Virginia-Kentucky- The following questions are based on Map T-6, the “Johnson City, Tennessee- North Carolina” topographic map. Carolina topographic map (scale 1:250,000: contour interval 100 feet). This may son of the Appalachian Mountains at the Tennessee, Kentucky, and Virginia (36 39’30″N, 83°01’05″W). Figure 41-4 is a satellite image of this same region (to scan the QR code for this exercise or go to the Hess Laboratory Manual website and a satellite image of this same region (to view this image, boratory Manual website and Exercise 41). Describe the general topography of the region between Clinch Mountain and Powell Mountain. (b) (c) What kind of stream drainage pattern has developed here? How has the road system been influenced by the topography? 2. (a) Describe the general topography in the region north of Poor Valley Ridge. (b) What kind of stream drainage pattern has developed here? How has the road system been influenced by the topography? (a) The Powell River has a meandering pattern. Is it flowing across a flat floodplain? How do you know? (b) T-6 BENEVE Johnson City, TN-VA-KY-NC 1:250.000 POWELL MOUNTAIN NEWMAN RIDGE COPPER RIDGE LEN RIDGE COMBY RIDGE MOUNTAIN CLINCH, MOUN 10 KILOMETERS Contour interval 100 ft.
The correct answer and explanation is:
iturn0image0turn0image1turn0image2turn0image4The region between Clinch Mountain and Powell Mountain in the Appalachian Mountains of Tennessee exhibits a series of parallel ridges and valleys. This topography is characterized by elongated ridges separated by narrow valleys, resulting from differential erosion of folded sedimentary rock layers. The stream drainage pattern in this area is predominantly trellis, where tributaries join main streams at right angles, reflecting the influence of the folded geology on stream courses. The road system adapts to this terrain by following the natural valleys and avoiding steep ascents, leading to roads that run parallel to the ridges and intersect at valley junctions.
North of Poor Valley Ridge, the landscape continues with similar ridge-and-valley formations, though the ridges may vary in elevation and continuity. The trellis drainage pattern persists, with streams confined to valleys between resistant ridges. Roads in this region are similarly influenced, adhering to the valleys’ paths to minimize elevation changes and construction challenges.
The Powell River exhibits a meandering pattern, typically associated with flat floodplains. However, in this region, the meanders occur within a confined valley, indicating that the river is incising into the landscape rather than flowing across a broad, flat floodplain. This suggests active downcutting, possibly due to uplift or changes in base level, leading to entrenched meanders within the valley walls.
These observations are based on the 1:250,000 scale topographic map with a 100-foot contour interval, which provides detailed insight into the area’s physiography and hydrography.
