Analysis of the sediment sources of flood driven erosion and deposition in the river channel of the Fu River Basin |
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| Institution: | 1. Department of Geology, National Museum of Natural Sciences, CSIC, Serrano 115 dupl., 28006 Madrid, Spain;2. Research Institute of Water and Environmental Engineering, Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain;3. Department of Agronomy, University of Almería, Spain;4. Desertification and Geo-ecology Group, Experimental Station of Arid Zones, EEZA-CSIC, Ctra. de Sacramento s/n, La Cañada de San Urbano, 04120 Almería, Spain;5. School of Geography and the Environment, University of Oxford, South Parks Road, OX13QY Oxford, United Kingdom;1. Posgrado en Ciencias, Centro de Investigación en Alimentación y Desarrollo, Unidad Hermosillo, Carretera Gustavo Astiazarán Rosas 46, Colonia La Victoria, Hermosillo, Sonora 83304, Mexico;2. Centro de Investigación en Alimentación y Desarrollo, Unidad Hermosillo, Carretera Gustavo Astiazarán Rosas 46, Colonia La Victoria, Hermosillo, Sonora 83304, Mexico;3. Unidad Académica Mazatlán, Instituto de Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, Calzada Montes Camarena s/n, Col. Playa Sur, Mazatlán 82040, Mexico;4. Departamento de Geología, División de Ciencias Exactas y Naturales, Universidad de Sonora, Rosales y Encinas, Hermosillo, Sonora 83000, Mexico;1. Ocean College, Zhejiang University, Zhoushan 316021, China;2. Ocean Research Center of Zhoushan, Zhejiang University, Zhoushan 316021, China;3. College of Geosciences, China University of Petroleum (Beijing), Beijing 102249, China;1. Department of Oceanography, Naval Postgraduate School, Monterey, CA 93943, USA;2. Department of Applied Ocean Physics and Engineering, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA |
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| Abstract: | Studying the characteristics of runoff and sediment processes and revealing the sources of sediment provide key guidance for the scientific formulation of relevant soil erosion protection measures and water conservancy development plans. In the current study, the flow and sediment data of five hydrological stations on the main stream of the Fu River Basin (FRB) from 2007 to 2018 were selected to identify flood events, explore the variation of sediment transport along the FRB, and clarify the sediment sources. The results found that the Jiangyou–Fujiangqiao section is the main source of sediment in the FRB during the flood season. The runoff volume and sediment load during flood events in the Jiangyou–Fujiangqiao section accounted for 35% and 145% respectively of that of Xiaoheba station. These results combined with the change of the sediment load before and after the 2008 Wenchuan Earthquake (May 12) show that the sediment in this section mainly comes from the Fu River tributary–the Tongkou River watershed. The calculation results for the sediment carrying capacity of the Fu River show that the main stream was in a state of erosion in theory. However, according to the calculation results for the interval sediment yield during flood events, the sediment load at the Xiaoheba station was smaller than that at the Shehong station upstream. The analysis indicates that this was not because of sediment deposition in the river channel, but because of sand mining in the river channel and sediment interception by water conservancy projects. If heavy rainfall occurs in the FRB, the sediment accumulated upstream will move downstream with the resulting flood, and the sediment yield in the FRB may further increase. These research conclusions can provide reference information for improving the prediction and management ability of soil and water loss in the FRB and scientific regulation of the Three Gorges Reservoir. |
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| Keywords: | Flood event Fu River Basin (FRB) Sediment source Channel erosion and deposition Sediment carrying capacity |
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