Lab 5 rivers shorelines fall 2023 answers

Lab 5 Streams and Coastlines Fall 2023 Name: Ashton Holland Date: 10/29/23 General questions 1. What is inherently wrong with the term ‘north is up’? a. There is nothing wrong with the term North is up, because in medieval time, some early Egyptian maps have south on the top and north at the bottom, even some maps have east on top because of the rising Sun. But we always have north on top because that is what the compass on the map shows and let us know that north is up. 2. What is a tributary? a. A tributary is a stream or river that flows into a larger stream or main stem river or a lake. 3. Explain how an oxbow lake forms. a. An oxbow lake starts out as a curve or meander in a river, and then a lake is form as the river goes a different, shorter, course. Over time, sediment seals the end of the old loop that leaves a separated area of water which is called an oxbow lake. 4. What is an alluvial fan? a. It is a triangle-shaped deposits of gravel, sand, and even smaller pieces of sediment, such as silt, which is also called alluvium. Alluvial fan is created as a flowing water that interacts with mountains, hills, and steep wall of a canyon. 5. Describe the difference between rectangular and trellis drainage patterns? a. A rectangular drainage pattern is characterized by a network of straight, interconnected river channels that resemble the layout of a grid or a series of rectangles. b. A trellis drainage pattern is characterized by a network of parallel main rivers, with shorter tributaries intersecting at right angles. 6. If you examine a map which has low relief and many oxbow lakes and meander scars, which stage of development is represented? a. If a map that has a low relief and numerous oxbow lakes and meander scars, then the stage of development that is representing is known as the “mature stage”. 7. Which ‘stage’ of stream would we find in V-shaped valleys surrounded by flat land? a. We would find a “youthful stage” if we encounter a V-shaped valley with flat land surrounding it.

8. Which stage of landscape has a distinct floodplain? a. It would be the “mature stage” that has a distinct floodplain. For the following maps (both streams and shorelines), all answers will be found on the maps. I strongly recommend a full size computer screen and not a phone or tablet. Elk Point SD, NE, IA map 1. What is the morphology of the Missouri River? a. Alluvial Morphology 2. Is this similar to the morphology of the Sioux River? a. Yes 3. What is the stage of the landscape at Prairie Center? a. The Mature Stage 4. What feature of floodplains are Lake Goodenough and McCook Lake? a. Oxbow Lakes 5. Identify at least one stream that starts as intermittent and finishes perennial (See slide 13). a. Vermillion stream Lake Scott, KS map 1. What is the drainage pattern of Timber Canyon? a. Dendritic drainage pattern 2. Are the Beaver and Michigan areas of this map hilly or flat? a. It is flat 3. What direction does Ladder Creek flow? a. It flows east 4. What are two clues you used to help you determine the direction of Ladder Creek flow? (See slide 10) a. Contour lines V upstream b. Contour elevation 5. What is the stage of development of Ladder Creek? a. It is the “mature stage”. Thackerville, OK, TX map 1. What is the drainage pattern of Bear Head Creek? a. A Trellis drainage pattern 2. If Moss Lake could drain freely, what direction would it flow? a. It would go north on the map 3. What general direction do the streams to the north and west of Sivells Bend School flow?

Point Reyes, CA 1. What erosional feature is Point Reyes? a. Wave cut cliffs 2. What type of bay is Drakes Estero? a. Estuary 3. What structural feature influenced the shape of Tomales Bay? (Hint: look at the entire bay on the map) a. Rift 4. What shoreline feature is represented by the numerous asterisks in the water? a. tombolo 5. In what compass direction is the longshore current elongating Limantour Spit? a. West 6. What shoreline feature separates Abbott’s Lagoon from the Pacific Ocean? a. Baymouth Bar Cordova, Alaska 1. What type of bay is Nelson Bay? (hint: look at the bathymetric contours) a. Fjord 2. What type of coastal features are Egg Island, Copper Sands, and Strawberry Reef? a. Deltas 3. What direction is the longshore current flowing based on Okalee Spit? a. West 4. What is the morphology of Copper River? a. Alluvial Point Sur, California 1. What is the type of sandbar that attaches Point Sur to the mainland? a. Tombolo 2. Asterisks are found all along the shoreline. What type of coastline do they indicate? a. Rocky Submergent 3. The contour lines along the coast at the southern part of the California Sea Otter Game Refuge are different than the ones at the northern part of the California Sea Otter Game Refuge. Which set of contour lines indicates steep cliffs? a. Northern Cameron, Louisiana 1. According to the lab book and powerpoint, what is the area along the shoreline to the east of Calcasieu Pass called? a. Strand Plain 2. What are the parallel ridges called?

a. Cheniers 3. Which ridge is the oldest one seen on this map? (use the red numbers to identify location) a. The farthest away from the seawall 4. Is the Calcasieu Pass a natural feature or manmade? a. Manmade