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The self-organization of step-pools in mountain streams
- Source :
-
Geomorphology . Jan2007, Vol. 83 Issue 3/4, p346-358. 13p. - Publication Year :
- 2007
-
Abstract
- Abstract: Spontaneous, autogenic self-organization has been described in numerous geomorphic systems, but it has not been investigated in detail with respect to coarse bedforms in general or step-pools in particular. In this paper, we review the spatial organization of step-pool systems and present example evidence of step-pool development as an autogenic self-organization process. We then outline the mathematical language for defining spatially divergent self-organization and test these ideas using two unique field examples from Oregon (Andrews Experimental Forest) and California (Baxter Creek), where step-pools developed from planar beds in artificially manipulated channels. Results show that step-pool development is consistent with a spatially divergent self-organization phenomenon. Entropy increases as initially undifferentiated planar channels diverge into steps and pools, then declines when a series of steps and pools of consistent size and spacing is established, signifying stability in the system. The self-organization process is accompanied by increasing flow resistance and decreasing slope (through increasing the “vertical sinuosity” of the step-pool profile and creation of low- or negative gradient pool areas), suggesting a minimization of stream power. The self-adjustment of the step-pool bed profile over time represents another manifestation of a general process that results in rhythmic patterns on the surface of Earth. [Copyright &y& Elsevier]
- Subjects :
- *RIVERS
*FOREST reserves
*EXPERIMENTAL forests
*HYDROLOGY
Subjects
Details
- Language :
- English
- ISSN :
- 0169555X
- Volume :
- 83
- Issue :
- 3/4
- Database :
- Academic Search Index
- Journal :
- Geomorphology
- Publication Type :
- Academic Journal
- Accession number :
- 23669688
- Full Text :
- https://doi.org/10.1016/j.geomorph.2006.02.021