River - Straight Channels, Erosion, Deposition

river

Table of Contents

Introduction
Importance of rivers
- Significance in early human settlements
- Significance to trade, agriculture, and industry
- Environmental problems attendant on river use
Distribution of rivers in nature
- World’s largest rivers
- Principles governing distribution and flow
  - Variation of stream regime
  - Determining factors
Drainage patterns
- Horton’s laws of drainage composition
- Morphometry of drainage networks
  - Relation of morphometric parameters and river flow
  - Evolution of drainage systems
Geometry of river systems
- Hydraulic geometry
- River channel patterns
  - Straight channels
  - Meandering channels
  - Braided channels
- Waterfalls
  - World distribution of waterfalls
    - High plateaus
    - Fall lines
    - Glaciated mountains
  - Types of waterfalls
    - Falls attributable to discordance of river profile
    - Falls attributable to differential erosion
    - Falls attributable to constructional processes
  - Development of waterfalls
Streamflow and sediment yield
- Peak discharge and flooding
- Sediment yield and sediment load
  - Measurement of the load
  - Sources of sediment and nature of deposition
    - Erosion in drainage basins
    - Environments of deposition
  - Factors that influence sediment yield
    - Short-term variations
    - Long-term or average sediment yield
  - Geomorphic variables
Rivers as agents of landscape evolution
- Valleys and canyons
  - Valley evolution
  - Formation of canyons and gorges
- Floodplains
  - Floodplain deposits, origins, and features
  - Time and the floodplain system
- River terraces
  - Origin of river terraces
  - Terraces and geomorphic history
- Alluvial fans
  - Size, morphology, and surface characteristics
  - Fan deposits and depositional processes
  - Economic significance
- Deltas
  - Classification of deltas
  - Morphology of deltas
  - Deposits and stratigraphy
  - Deltas and time
- Estuaries
  - Origin and classification
  - Sedimentation in estuaries
The river system through time
- Drainage diversion by stream capture
- Non-fluvial invasion and deposition
- Effects of climatic change

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Straight channels, mainly unstable, develop along the lines of faults and master joints, on steep slopes where rills closely follow the surface gradient, and in some delta outlets. Flume experiments show that straight channels of uniform cross section rapidly develop pool-and-riffle sequences. Pools are spaced at about five bed widths. Lateral shift of alternate pools toward alternate sides produces sinuous channels, and spacing of pools on each side of the channel is thus five to seven bed widths. This relation holds in natural meandering streams. Meandering channels are single channels that are sinuous in plan, but there is no criterion, ...(100 of 32811 words)

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