LE 2

• Geomorphology

  Study of the Earth’s surface landforms.

  • understand the ways in which landforms are created

  • and to document the evolution of landforms through time
• Geomorphology = “geo” earth + “morphe” form + “logos”

  study
• Geomorphometry = “metre” or “metron” to measure
• Science of quantitative land-surface analysis?

  geomorphometry
• • evolved directly from geomorphology and quantitative terrain

  analysis?

  geomorphometry
• • describes various geomorphological characteristics of thewatershed using standard equations or formulas??

  geomorphometry
• what are the 5 geomorphometric parameters? DSRSD

  dimensional characteristics, shape parameters, relief parameters, stream order parameter, drainage parameters
• dimensional characteristics consist the basin area, basin perimeter, and basin length
• Basin length is the measure from

  farthest drainage divide to the main

  outlet of the river basin following the

  principal flow path or the main

  channel
• • Describes the elongation or compactness of a watershed

  • Impacts how surface run-off accumulates in the watershed?

  shape parameters
• gravelius' form factor = average width / axial length of the basin
• what type of shape parameter formula is this?

  elongation ratio

  
• what type of shape parameter is this?

  circularity ratio

  
• what type of shape parameter is this?

  form factor

  
• what type of shape parameter is this?

  shape factor

  
• what type of shape parameter is this?

  lemniscate index

  
• what type of shape peremeter is this?

  compactness coefficient

  
• as the value of circularity ratio, elongation ratio, and form factor increases, the watershed is likely circular
• as the value of shape factor, lemniscate index, and the compactness coefficient decreases, the watershed is likely circular
• • Elevational values are needed prior to analysis

  • Looks at terrain and how it influences the stream gradient

  • Major factor in flood patterns and sediment transport, what type of parameter is this?

  relief parameters
• as the value of relief parameters increase, the steeper or more rugged the watershed
• basin relief

  
• relief ratio

  
• relative relief

  
• ruggedness number

  
• melton's ruggedness number

  
• Stream Order Parameters

  • Help determine hydrodynamic behavior of streamflow
• bifurcation ratio

  
• stream length ratio

  
• rho coefficient

  
• higher bifurcation, more prone to flood due to highly dissected
• lower stream length ratio, higher risks on soil erosion
• higher rho coefficient, higher water storage capacity of a basin
• types of stream ordering (SHSHT)?

  strahler, horton, shreve, hack, topological
• stream frequency

  
• texture ratio
• drainage density

  
• drainage intensity

  
• constant of channel maintenance

  
• length of overland flow