an index of floodplain surface complexity
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2016
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Abstract
Floodplain surface topography is an important component of floodplain
ecosystems. It is the primary physical template upon which ecosystem
processes are acted out, and complexity in this template can contribute to
the high biodiversity and productivity of floodplain ecosystems. There has
been a limited appreciation of floodplain surface complexity because of the
traditional focus on temporal variability in floodplains as well as
limitations to quantifying spatial complexity. An index of floodplain surface
complexity (FSC) is developed in this paper and applied to eight
floodplains from different geographic settings. The index is based on two key
indicators of complexity, variability in surface geometry (VSG) and the
spatial organisation of surface conditions (SPO), and was determined at
three sampling scales. FSC, VSG, and SPO varied between the eight
floodplains and these differences depended upon sampling scale. Relationships
between these measures of spatial complexity and seven geomorphological and
hydrological drivers were investigated. There was a significant decline in
all complexity measures with increasing floodplain width, which was explained
by either a power, logarithmic, or exponential function. There was an initial
rapid decline in surface complexity as floodplain width increased from 1.5 to
5 km, followed by little change in floodplains wider than 10 km. VSG also
increased significantly with increasing sediment yield. No significant
relationships were determined between any of the four hydrological variables
and floodplain surface complexity.
| Reference Key |
scown2016hydrologyan
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|
|---|---|
| Authors | ;M. W. Scown;M. C. Thoms;N. R. De Jager |
| Journal | materials research bulletin |
| Year | 2016 |
| DOI |
10.5194/hess-20-431-2016
|
| URL | |
| Keywords |
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