CHAPTER 16 Concept Review

CHAPTER 16 Concept Review

The Human Sphere: People and Floodplains

Question 16.54

1. What are the benefits of locating a large city near a river on a floodplain? What problems arise for cities on floodplains?

16.1 Stream Patterns

Question 16.55

2. What are tributaries and trunk streams? How do these phenomena fit into drainage basins?

Question 16.56

3. What is the difference between a drainage divide and a continental divide?

Question 16.57

4. What is an internal drainage basin? Why are lakes found there typically saline?

Question 16.58

5. Compare the different types of drainage patterns. Which is the most common on Earth’s surface?

Question 16.59

6. What happens to stream order when a first-order stream merges with a second-order stream? What happens when two second-order streams merge? What order of stream is the Amazon River?

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Question 16.60

7. Compare and contrast intermittent, permanent, ephemeral, and exotic streams.

16.2 Downcutting by Streams: Fluvial Erosion

Question 16.61

8. What is fluvial erosion? Why is it the most important agent of erosion?

Question 16.62

9. What is headward erosion? How do rills and gullies relate to headward erosion?

Question 16.63

10. What is downcutting? Where does it occur?

Question 16.64

11. What is stream discharge? What four main factors determine stream discharge?

Question 16.65

12. What is a stream hydrograph? Compare natural stream discharge with discharge of streams in urbanized areas.

Question 16.66

13. What is abrasion? How does it relate to fluvial erosion?

Question 16.67

14. What is a stream load? List three types of stream loads.

Question 16.68

15. Compare stream capacity with stream competence. What factors increase each?

Question 16.69

16. In what situations do stream capacity and stream competence decrease? What happens to the stream load when they decrease?

Question 16.70

17. What does it mean to say that a stream is graded? Compare a graded stream with one that is not graded.

Question 16.71

18. What is base level?

Question 16.72

19. Why do some streams have V-shaped valley walls, while others form slot canyons?

Question 16.73

20. What is a knickpoint? Why do knickpoints migrate upstream?

Question 16.74

21. What is stream rejuvenation? What rejuvenates a stream? What do streams do once they are rejuvenated?

Question 16.75

22. How do entrenched meanders and stream terraces form?

Question 16.76

23. What is a water gap? Explain how this landform forms in the context of geologic uplift.

Question 16.77

24. What is stream piracy? How does one stream divert another?

16.3 Building by Streams: Fluvial Deposition

Question 16.78

25. What does it mean to say that streams “sort” their load? Why is it sorted? How is it sorted?

Question 16.79

26. What is aggradation? Where does it occur? How does it relate to stream capacity and stream competence?

Question 16.80

27. What are braided streams? Where do they form?

Question 16.81

28. What are alluvial fans? Where do they form?

Question 16.82

29. What is a stream meander? What is a thalweg, and how does it relate to stream meander development? How are point bars and cut banks related to the development and migration of meanders?

Question 16.83

30. Where do natural levees form? How do they form?

Question 16.84

31. Identify several floodplain landforms.

Question 16.85

32. Why do deltas form at base level? What are the two main delta shapes?

Question 16.86

33. What are distributaries? Where are they found? How do they form?

Question 16.87

34. What is subsidence? Why do deltas experience it? Explain how deltas maintain an equilibrium between sedimentation and subsidence.

Question 16.88

35. How do artificial levees disrupt the equilibrium between sedimentation and subsidence?

16.4 Rising Waters: Stream Flooding

Question 16.89

36. Why do floods happen? What two kinds of flooding are there?

Question 16.90

37. What three major approaches are used to control floods? Explain how each works and the advantages and disadvantages of each.

16.5 Geographic Perspectives: Dam Pros and Cons

Question 16.91

38. How do dams provide water?

Question 16.92

39. How do dams generate hydroelectricity?

Question 16.93

40. Why do sediments settle out in reservoirs?

Question 16.94

41. How do dams create habitat loss? Relate your answer to the salmon runs of the Pacific Northwest.

Question 16.95

42. How do dams relate to climate change?