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Extra resources for Geomorphology and River Management: Applications of the River Styles Framework
Example text
Scale Timeframe of evolutionary adjustment Frequency of disturbance event Geomorphic influence on aquatic ecology Ecoregion 105–106 years 103 months Catchment 105–106 years 103 months Landscape unit 103–104 years 102 months Reach 101–102 years 101 months Tectonic influences on relief, slope, and valley width are combined with lithologic and climatic controls on substrate, flow, and vegetation cover (among other factors) to determine the boundary conditions within which aquatic ecosystems function.
Hydrological connectivity varies markedly for different types and scales of rivers at different positions in landscapes (and catchments), and in differing environmental settings. For example, patterns and rates of biophysical fluxes operate quite differently in small, headwater streams that are largely bedrock-based and have no floodplain, relative to expansive lowland plains with differing substrate conditions and an array of floodplain features such as billabongs and wetlands. Alternatively, flash floods in arid environments are irregular occurrences, while seasonal flooding in monsoonal settings is a relatively predictable phenomenon.
Flow energy is dissipated across broad alluvial surfaces. , slopes and channels are decoupled). As a consequence, sediments are delivered to the channel almost entirely from upstream sources. Relatively low stream power conditions reflect low slopes as base level is approached. The decline in stream power is marked by a decrease in bed material texture. Indeed, these tend to be suspended load systems. 4 Drainage patterns and examples from coastal New South Wales, Australia (a) A wide range of drainage patterns has been described, influenced primarily by the regional geology (see text).
