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Potential of iron oxides to assess connectivity in sediment transport

AutorGuzmán, Gema ; Gómez Calero, José Alfonso
Fecha de publicaciónsep-2016
Citación4th MC meeting and WG meetings (2016)
ResumenThe knowledge of water erosion processes is essential when predicting the effects of soil conservation struc- tures aimed to disrupt connectivity in sediment transport across the landscape. Experiments (field and laboratory) measuring the overall effect of these structures and model analysis are usually the techniques used to evaluate their effectiveness. The use of sediment tracers is an attractive tool to complement those technologies. During the last years a tracer methodology based on the application of iron oxides as magnetite, hematite and goethite to the top soil profile has been evaluated. The use of these iron oxides as sediment traces has been validated in laboratory and field experiments. They have been employed, afterwards, to monitor preferential flows, identify sources of sediments, quantify medium term erosion rates and to map soil redistribution within agricultural fields due to erosion and deposition. Despite of their limitations (to be discussed in the presentation) they provide useful information to evaluate the efficiency of water conservation measurements such as grass strips or stone bunds to optimize their imple- mentation and to calibrate parameters for improving the accuracy of soil erosion models, and therefore to extrapolate their results to larger spatial and temporal scales.
DescripciónTrabajo presentado en la 4th MC meeting and WG meetings (Connecteur), celebrado en Praga del 21 al 23 de septiembre de 2016.
Aparece en las colecciones: (IAS) Comunicaciones congresos
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