CH 2: Fluvial Processes

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Questions and Answers

What landform is typically formed when a river undergoes meandering in its course?

  • Natural levees
  • Braided streams
  • Flood plains
  • Oxbow lakes (correct)

What is the landform characterized by multiple interweaving channels separated by bars or islands of sediment?

  • Braided streams (correct)
  • Oxbow lakes
  • Natural levees
  • Flood plains

What term refers to the balance between erosion and deposition in a river?

  • River grading (correct)
  • Rejuvenation
  • River capture
  • Antecedent drainage

In river capture, what is the name of the river segment diverting the headwaters of another river?

<p>Captor stream (B)</p> Signup and view all the answers

What landform is formed from the accumulation of sediment during flood events?

<p>Natural levees (A)</p> Signup and view all the answers

When does rejuvenation of a river occur?

<p>Due to tectonic uplift (B)</p> Signup and view all the answers

What term describes a reduced river flowing in an unusually large valley left behind by a captured stream?

<p>Misfit stream (C)</p> Signup and view all the answers

What does an antecedent drainage pattern refer to?

<p>When rivers establish their courses pre-tectonic uplift (C)</p> Signup and view all the answers

What feature is left behind by a diverted river in river capture?

<p>Wind gap (B)</p> Signup and view all the answers

In fluvial geomorphology, what serves as evidence of the river's dynamic nature and constant reshaping of the landscape?

<p>Oxbow lakes (A)</p> Signup and view all the answers

What is the main focus of fluvial geomorphology?

<p>Analyzing processes and landforms associated with rivers and streams (A)</p> Signup and view all the answers

Which environmental factors can rivers respond to?

<p>Climate, topography, geology, and human activities (A)</p> Signup and view all the answers

What type of valleys do rivers in the upper course typically have?

<p>V-shaped valleys due to vertical erosion (C)</p> Signup and view all the answers

What is the longitudinal profile of a river?

<p>A side view from source to mouth showing the river's gradient (D)</p> Signup and view all the answers

Why does a river's gradient flatten as it progresses towards its mouth?

<p>As a result of decreased erosion and increased deposition (B)</p> Signup and view all the answers

What does the plan view of a river show?

<p>An aerial perspective showing the river's path (D)</p> Signup and view all the answers

What is the primary purpose of understanding fluvial processes?

<p>Predicting flood risks and managing water resources (C)</p> Signup and view all the answers

What does lateral erosion lead to in river valleys?

<p>Expansion of valley width (D)</p> Signup and view all the answers

How does a river's valley shape change from upper course to lower course?

<p>It changes from V-shaped to U-shaped valleys (B)</p> Signup and view all the answers

Why is understanding fluvial processes important for land management?

<p>To assist in planning sustainable land use practices (A)</p> Signup and view all the answers

What is the primary process that leads to the formation of meanders in a river?

<p>Erosion on the outer bank (A)</p> Signup and view all the answers

In fluvial geomorphology, what landform is characterized by multiple interweaving channels separated by bars or islands of sediment?

<p>Braided stream (C)</p> Signup and view all the answers

What effect does rejuvenation have on a river's erosive power?

<p>Increases it (B)</p> Signup and view all the answers

What is the term for a flat area adjacent to a river that is periodically flooded and highly fertile?

<p>Flood plain (C)</p> Signup and view all the answers

What pattern of drainage occurs when rivers flow across rising terrain without being diverted, cutting through it instead?

<p>Antecedent drainage (D)</p> Signup and view all the answers

What feature is left behind by a river after it captures the headwaters of another river?

<p>Misfit stream (D)</p> Signup and view all the answers

What does river grading refer to in fluvial geomorphology?

<p>The balance between erosion and deposition (C)</p> Signup and view all the answers

Which of the following factors can lead to the rejuvenation of a river?

<p>Increased sediment load (D)</p> Signup and view all the answers

What is a key characteristic of rivers with braided streams?

<p>High energy levels (A)</p> Signup and view all the answers

What landform is formed when a meander becomes cut off from the main channel?

<p>Oxbow lake (B)</p> Signup and view all the answers

What do rivers in the middle and lower courses typically transition into in terms of their cross-sectional profiles?

<p>U-shaped profiles (A)</p> Signup and view all the answers

What does the longitudinal profile of a river illustrate?

<p>River's gradient or slope (B)</p> Signup and view all the answers

Why do rivers in the upper course often have steep, V-shaped valleys?

<p>Due to vertical erosion (B)</p> Signup and view all the answers

What is the primary focus of fluvial geomorphology?

<p>Investigating rivers and streams (C)</p> Signup and view all the answers

What environmental factors can rivers respond to?

<p>Topography and geology (C)</p> Signup and view all the answers

Why is understanding fluvial processes crucial for predicting flood risks?

<p>To plan sustainable land use (A)</p> Signup and view all the answers

What type of valley shape do rivers typically exhibit in the lower course?

<p>U-shaped valleys (A)</p> Signup and view all the answers

What type of rivers exhibit imbalances between erosion and deposition due to factors like tectonic uplift or variations in sediment load?

<p>Ungraded rivers (A)</p> Signup and view all the answers

In fluvial geomorphology, what process leads to the formation of terraces, knickpoints, and incised meanders?

<p>Rejuvenation (A)</p> Signup and view all the answers

What type of valleys are left behind by diverted rivers in river capture, resulting from the diverted river's path?

<p>Wind gaps (C)</p> Signup and view all the answers

Which landform is characterized by raised banks formed from the accumulation of sediment during flood events?

<p>Natural levee (C)</p> Signup and view all the answers

What is the term for a river system that cuts through underlying strata, maintaining its original course despite differences in rock hardness?

<p>Superimposed drainage (C)</p> Signup and view all the answers

Which feature represents a point where a captor stream diverts the flow of a captured stream in river capture processes?

<p>Elbow of capture (C)</p> Signup and view all the answers

What characteristic is typically exhibited by rivers with braided streams?

<p>Interweaving channels separated by sediment bars (D)</p> Signup and view all the answers

In a graded river, what state of equilibrium has been achieved between erosion and deposition?

<p>'Stable' state (C)</p> Signup and view all the answers

What landform is evidence of a river's dynamic nature and constant reshaping of the landscape?

<p>Oxbow lake (D)</p> Signup and view all the answers

What term describes the process where rivers establish their courses before tectonic uplift and continue to flow across rising terrain?

<p>Antecedent drainage (B)</p> Signup and view all the answers

What is the primary reason behind rivers in the upper course having V-shaped valleys?

<p>Vertical erosion (A)</p> Signup and view all the answers

How does the cross-sectional profile of a river change as it moves from the upper course to the lower course?

<p>The valleys become broader and shallower (C)</p> Signup and view all the answers

What factor contributes to the concave up shape of a river's longitudinal profile?

<p>Transition from vertical to lateral erosion (D)</p> Signup and view all the answers

Which type of valley shape do rivers in the lower course typically exhibit?

<p>U-shaped valleys (C)</p> Signup and view all the answers

What aspect of rivers' cross-sectional profiles changes due to the dominance of lateral erosion in the middle and lower courses?

<p>Depth decreases, width increases (C)</p> Signup and view all the answers

Why do rivers exhibit a concave up longitudinal profile?

<p>Reflecting transition from rapid erosion to deposition (C)</p> Signup and view all the answers

What environmental factor plays a significant role in shaping rivers' cross-sectional profiles?

<p>Topography variations (A)</p> Signup and view all the answers

What characterizes rivers in terms of their longitudinal profile as they progress towards their mouths?

<p>The gradient flattens out (B)</p> Signup and view all the answers

Why do rivers in the middle and lower courses have broader valleys compared to those in the upper course?

<p>Dominance of lateral erosion (A)</p> Signup and view all the answers

What type of landform is typically observed when rivers undergo meandering along their course?

<p>Oxbow lakes (C)</p> Signup and view all the answers

What is the primary focus of fluvial geomorphology?

<p>Examining how flowing water interacts with the landscape and shapes the Earth's surface (A)</p> Signup and view all the answers

What characteristic is typically exhibited by rivers with braided streams?

<p>Multiple narrow channels separated by bars or islands of sediment (D)</p> Signup and view all the answers

Why do rivers in the upper course often have steep, V-shaped valleys?

<p>Caused by rapid erosion processes (B)</p> Signup and view all the answers

What term describes the process where rivers establish their courses before tectonic uplift and continue to flow across rising terrain?

<p>Antecedent drainage pattern (C)</p> Signup and view all the answers

What is a key characteristic of rivers with meandering paths?

<p>Curving paths due to lateral erosion and deposition (B)</p> Signup and view all the answers

In a river's cross-sectional profile, what changes as lateral erosion becomes dominant in the middle and lower courses?

<p>Valleys become broader and shallower (C)</p> Signup and view all the answers

What does a river's longitudinal profile typically illustrate from source to mouth?

<p>Concave up shape reflecting erosion-deposition balance (D)</p> Signup and view all the answers

What is the term for a river capturing the headwaters of another, resulting in significant changes in drainage patterns?

<p>Stream Piracy (A)</p> Signup and view all the answers

What do natural levees act as during flood events?

<p>Flood Retainers (B)</p> Signup and view all the answers

In fluvial geomorphology, what is the term for the process where a river's erosive power increases due to various factors?

<p>River Rejuvenation (A)</p> Signup and view all the answers

What do oxbow lakes serve as evidence of?

<p>Dynamic River Behavior (D)</p> Signup and view all the answers

What type of valley shape is typically left behind by a diverted river in river capture processes?

<p>Wind Gap Valley (A)</p> Signup and view all the answers

What landform is characterized by multiple interweaving channels separated by bars or islands of sediment?

<p>Braided Stream (B)</p> Signup and view all the answers

What is the term for a river system that maintains its original course despite variations in underlying rock hardness?

<p>Superimposed Drainage (C)</p> Signup and view all the answers

What feature represents the point where a captor stream diverts the flow of a captured stream in river capture processes?

<p>Elbow of Capture (D)</p> Signup and view all the answers

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