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Distribution of bog and heath in a Newfoundland blanket bog complex; topographic limits on the hydrological processes governing blanket bog development


Distribution of bog and heath in a Newfoundland blanket bog complex; topographic limits on the hydrological processes governing blanket bog development



Hydrology and Earth System Sciences 3(2): 223-232



ISSN/ISBN: 1027-5606

DOI: 10.5194/hess-3-223-1999

This research quantified the role of topography on hydrological processes within and, hence, the development of, blanket bogs. Topographic characteristics were derived from digital elevation models (DEMs) developed for the surface and underlying substrate at three blanket bog sites on the southeastern lobe of the Avalon Peninsula, Newfoundland. A multinomial logit (MNL) model of the probability of bog occurrence was constructed in terms of relevant topographic characteristics. The resulting model was then used to investigate the probabilistic boundary conditions of bog occurrence within the landscape. Under average curvatures for the sites studied, substrate slopes up to 0.065 favoured blanket bog development. However, steeper slopes could, theoretically, be occupied by blanket bog where water is concentrated by convergent curvatures or large contributing areas. Near community boundaries, bog and heath communities both occupied similar topographic conditions. Since these boundary locations are capable of supporting the hydrological conditions necessary for bog development, the heath is likely to be encroached upon by bog.

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Accession: 018761106

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