Computing structural and functional flow and sediment connectivity with a new aggregated index: A case study in a large Mediterranean catchment

The Science of the Total Environment
Manuel López-Vicente, Nahed Ben-Salem

Abstract

Hydrological connectivity in large catchments is influenced by natural and human-induced heterogeneities and dynamic processes. In this study, a new aggregated index (AIC) based on topography, C-RUSLE factor, RUSLE2 rainfall erosivity, residual topography and soil permeability, was proposed to model structural and functional flow and sediment connectivity (FSC). It was tested in a large Mediterranean catchment (Vero River, NE Spain, 380 km2) with contrasted physiographic and climatic conditions (19 land uses and 15 types of lithology). Twelve weather stations were used and simulations were done at 5 m of pixel resolution using a LiDAR-derived DEM and the D-Infinity algorithm. Structural FSC (FSC-st) was computed with both an updated version of Borselli's index (IC) and the AIC. Values of connectivity with AIC followed a normal distribution with a wider range of values compared with the non-normal distribution obtained with Borselli's approach. The differences in the values of FSC-st between the different land uses were similar with the two indices and in agreement with the soil erosion rates reported in comparable landscapes. The spatial characteristics at sub-catchment scale were better reflected with AIC although values of FS...Continue Reading

Citations

May 22, 2020·The Science of the Total Environment·M López-VicenteM E Lucas-Borja
Jun 1, 2020·The Science of the Total Environment·A J Ortíz-RodríguezL Borselli
May 4, 2020·The Science of the Total Environment·Lorenzo MartiniMarco Cavalli

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