GY 301: Geomorphology Lab 6: Fluvial Geomorphology and Processes Page 1 of 5Your Task: From now on, you lab exercises will primarily involve map interpretations. You should be able to complete them within the 2 hour lab period provided that you do focused work on them. Please note that the topographic maps you will be using come in different scales and that we don’t necessarily have a lot of copies of each map. For some maps, we only have 3 or 4 copies. When absolutely necessary, you will be provided with scanned portions of maps, but most times, you will have to share maps. The most common scale (1:24,000) will not easily fit on the small desks that we have in room 42 so it might be a good idea to push a couple of them together to form a larger table surface. Please put the desks back in rows when you are done. Outside of the normal lab session, maps are available in the storage cabinets in room 337. They are alphabetically sorted. Due Date: 5:00 PM October 16th PART I: Stream Profiles and Discharge Problem 1: Imagine that you are a hydrogeologist, and that you must calculate the discharge rate and the amount sediment being transported by a stream. A floating object was dropped into the middle of the stream channel and timed as it traveled a known distance of 300 feet. The result was 41 seconds of travel time. What is the velocity of the stream in feet per second? (show calculation steps for partial credit) Velocity (feet/second) = ____________________________________ [3 points] Problem 2: Given the profile constructed in Figure 1 (top of next page), which was based on depth soundings made across the stream channel, calculate the discharge of the stream (on next page). You should count the rectangles in Figure 1 to determine the cross sectional area of the stream. Assume that each rectangle is 15 feet wide and 10 feet high. Constants 1.0 foot3 of stream water = 7.85 Gallons Density of Stream Water = 1.05 1.0 Gallon of Stream Water = 8.753 Pounds Name: ________________________ Raw score: ______/60 Percentage: __________/100%GY 301: Geomorphology Lab 6: Fluvial Geomorphology and Processes Page 2 of 5 SURFACE OF STREAM Problem 2 (Continued): Calculate the following (show calculation steps for partial credit): a) Total cross-sectional area in feet2 = _________________________ [3 points] b) Discharge in feet3/second = __________________________ [5 points] c) Discharge in gallons/minute = _________________________ [5 points] d) Discharge converted to: (pounds of water)/minute = _________________ [2 points]GY 301: Geomorphology Lab 6: Fluvial Geomorphology and Processes Page 3 of 5PART TWO: Fluvial Maps Interpretation Problem 1: Cumberland MD-PA-WVA 7.5' Sheet a) Carefully inspect the quadrangle topography. Inspect the direction of flow of the various stream systems throughout the north central portion of the quadrangle. In terms of local stream flow direction what is significant about the crest of the Little Allegheny Mountains? What geomorphic term would best describe this feature; at least as far as the local area is concerned? _________________________________________________________ [2 points] b) What kind of drainage pattern best describes the river/stream network on the map sheet? ___________________________________________________________ [2 points] c) How might a feature like The Narrows have formed (a thinking question) . _____________________________________________________________________________________ _____________________________________________________________________________________ ____________________________________________________________________________ [3 points] Problem 2: West of Furnace Creek, CA 7.5' Sheet a) Calculate the gradient (feet/mile) of the stream in Echo Canyon from where it crosses the section line between Sects 16 and 21 in T27N, R2E until it crosses the 800’ contour line in Sect 21. (show your work for partial credit). _________________________________________________________ [3 points] b) Have you noticed that most topographic maps have Township/Range and UTM grids? What are the UTM coordinates from the starting point of this gradient question to the end? ____________________________ (start) to ___________________________ (end) [2 points]GY 301: Geomorphology Lab 6: Fluvial Geomorphology and Processes Page 4 of 5Problem 3: Jordan Narrows, Utah 7.5' Sheet [Only 3 Maps] a) The NE1/4 of section 12, T5S, R1W contains several islands which are surrounded by the Jordan River. Describe how these islands form, and list the term for the type of landform feature present in this area of the map. _____________________________________________________________________________________ _____________________________________________________________________________________ ____________________________________________________________________________ [3 points] b) Give the location (nearest 1/4 section) of a place on the Jordan River that is most likely to evolve into a landform feature like the one in the NE 1/4 of section 12 at some time in the near future. _________________________________________________________ [2 points] Problem 4: Lake Tapps, Washington 15' Sheet a) At what stage of stream erosion is the valley between the towns of Orting and Sumner? Cite your evidence. _____________________________________________________________________________________ _____________________________________________________________________________________ ____________________________________________________________________________ [3 points] b) At what stage of stream erosion is the valley drained by the Carbon River near the town of Carbonado? Cite your evidence. _____________________________________________________________________________________ _____________________________________________________________________________________ ____________________________________________________________________________ [2 points]GY 301: Geomorphology Lab 6: Fluvial Geomorphology and Processes Page 5 of 5Problem 5: Campti, LA 15' Sheet (Warning: French grid pattern (red) used around the Red River; use UTM coordinates (black) instead.) a) What geomorphological feature is found at UTM coordinates 496500E, 3519000N? _________________________________________________________ [2 points] b) What fluvial term best describes Bourbeaux Bayou in the eastern portion