Initiation and evolution of gullies along the shoreline of Lake Huron |
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| Institution: | 1. A.A. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia;2. Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia;1. Luiz de Queiroz School of Agriculture, University of São Paulo, Av. Pádua Dias 11, Piracicaba CEP 13418-900, Brazil;2. Instituto de Investigaciones Biológicas y Tecnológicas, Centro de Ecología y Recursos Naturales Renovables (CONICET – Universidad Nacional de Córdoba), Av. Vélez Sarsfield 1611, Córdoba X5016GCA, Argentina;1. Department of Agricultural, Food and Environmental Sciences, University of Perugia, Borgo XX Giugno 74, 06121 Perugia, Italy;2. Department of Engineering, University of Perugia, Via G. Duranti, 93-06125 Perugia, Italy;1. Área de Paleontología, Universidad de Extremadura, Badajoz 06006, Spain;2. State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi''an, 710069, China;3. Department of Geological Sciences, University of Missouri, Columbia, MO 65211, USA;4. Department of Geosciences, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA |
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| Abstract: | Over one hundred gullies are deeply incised into Algonquin Bluff along the eastern shoreline of Lake Huron. Aerial photographs between 1930 and 1992 were used to measure temporal changes in area and length of a sample of forty-four gullies. Regression analysis shows that gully area and length have increased in a linear fashion, and that gully initiation occurred in the nineteenth century. Gully initiation coincides with deforestation and settlement of the area. Surface drainage was redirected into drainage ditches, concentrating the flow and enhancing gully erosion. Natural processes associated with climatic fluctuations are probably insufficient to cause gully initiation, but may contribute to ongoing gully expansion. |
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