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Poster De Conférence Année : 2016

Evolution of overland flow connectivity in bare agricultural plots

Résumé

Soil surface roughness not only delays overland flow generation but also strongly affects overland flow distribution and concentration. Previous studies generally aimed at predicting the delay in overland flow generation by means of a single parameter characterizing soil roughness. However, little work has been done to find a link between soil roughness and overland flow dynamics. This is made difficult because soil roughness and hence overland flow characteristics evolve differently depending on whether diffuse or concentrated erosion dominates. The present study examines whether the concept of connectivity can be used to link roughness characteristics to overland flow dynamics. For this purpose, soil roughness of three 30-m2 tilled plots exposed to natural rainfall was monitored during 2 years. Soil micro-topography was characterized by means of photogrammetry on a monthly basis. Soil roughness was characterized by the variogram, and overland flow connectivity by a functional connectivity in- dicator called the Relative Surface Connection function (RSCf). Overland flow hydrograms were generated by a physically-based overland flow model (FullSWOF_2D) on 1-cm resolution digital elevation models. The devel- opment of eroded flow paths at the soil surface not only reduced the delay in overland flow generation but also resulted in a higher continuity of high flow velocity paths, an increase in erosive energy and a higher rate of in- crease of the overland flow hydrograph. Overland flow dynamics were found to be highly correlated to the RSCf characteristic points. This high correlation shows the potential of the RSCf both to serve as a quantitative link between soil roughness and overland flow generation by providing information regarding overland flow dynamics and to improve the overland flow hydrograph prediction.
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Format : Poster

Dates et versions

hal-01731144 , version 1 (13-03-2018)

Identifiants

  • HAL Id : hal-01731144 , version 1
  • PRODINRA : 353567

Citer

Andrés Peñuela, Frédéric Darboux, Mathieu Javaux, Charles L. Bielders. Evolution of overland flow connectivity in bare agricultural plots. European Geosciences Union General Assembly 2016, Apr 2016, Vienne, Austria. EGU, Geophysical Research Abstracts, 18, 2016, Geophysical Research Abstracts. ⟨hal-01731144⟩
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