The effects of land use and topographic changes on sediment connectivity in mountain catchments
Llena Hernando, Manel
Smith, Mark William
MetadataShow full item record
Understanding the evolution of sediment connectivity associated with different land use and topographic changes is a prerequisite for a better understanding of sediment budgets and sediment transport processes. We used the Index of Sediment Connectivity (IC) developed by Cavalli et al. (2013) based
on the original approach by Borselli et al. (2008) to study the effects of decadal-scale land use and topographic changes on sediment connectivity in mountain catchments. The input variables of the IC (i.e. land cover and topography) were derived from historical aerial photos using Structure from Motion-Multi View Stereo algorithms (SfM-MVS). The method was applied in different sub-catchments of the Upper River Cinca Catchment (Central Pyrenees), representative of three scenarios: (a) Land cover changes; (b) Topographic changes in agricultural fields (terracing); and (c) Topographic changes associated with infrastructure (road construction). In terms of land cover changes, results show that although connectivity is increased in some areas due to the establishment of new field crops, for most of the study area connectivity decreased due to afforestation caused by rural abandonment. Topographic changes due to the establishment of agricultural terraces affected connectivity to a larger degree than land cover changes. Terracing generally reduced connectivity due to the formation of flat areas in step-slopes, but in certain points, an increase in connectivity caused by the topographic convergence produced by terraces was observed. Finally, topographic changes associated with road construction greatly modified surface flow directions and the drainage network, resulting in changes in connectivity that may affect erosional processes nearby. The methodology used in this paper allows to study the effects of real decadal-scale land use and topographic changes on sediment connectivity and also evaluating and disentangling those changes. Furthermore, this approach can be a useful tool to identify potential risks associated with morphological and land use changes, involving road infrastructures.
Is part ofScience of the Total Environment, 2019, vol. 660, p. 899-912
European research projects
Showing items related by title, author, creator and subject.
Influences of catchment and river channel characteristics on the magnitude and dynamics of storage and re-suspension of fine sediments in river beds Park, Jungsu; Batalla, Ramon J.; Birgand, François; Esteves, Michel; Gentile, Francesco; Harrington, Joseph R.; Navratil, Oldrich; López Tarazón, José Andrés; Vericat Querol, Damià (MDPI, 2019-04-26)Fine particles or sediments are one of the important variables that should be considered for the proper management of water quality and aquatic ecosystems. In the present study, the effect of catchment characteristics on ...
Aplicación de algoritmos Structure from Motion (SfM) para el análisis histórico de cambios en la geomorfología fluvial Llena Hernando, Manel; Vericat Querol, Damià; Martínez Casasnovas, José Antonio (Sociedad Española de Geomorfología y Asociación Española para el Estudio del Cuaternario, 2018-06-29)En el presente artículo se presenta el flujo de trabajo para la obtención de información espacial utilizada para el análisis de cambios geomorfológicos fluviales en el tramo alto del río Cinca (Pirineo Aragonés) durante ...
Asynchronicity of fine sediment supply and its effects on transport and storage in a regulated river Marteau, Baptiste; Batalla, Ramon J.; Vericat Querol, Damià; Gibbins, Chris N. (Springer, 2018)Purpose A disconnected ephemeral tributary was reconnected to the regulated River Ehen (NW England) as part of a river restoration initiative, providing a renewed delivery of sediment to a highly stable and armoured ...