2024-03-29T01:21:41Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1697572021-03-01T05:30:47Zcom_10261_75com_10261_6col_10261_328
DIGITAL.CSIC
author
López-Vicente, Manuel
author
Ben-Salem, Nahed
funder
Ministerio de Economía y Competitividad (España)
funder
Instituto Agronómico Mediterráneo de Zaragoza
orcid
López-Vicente, Manuel [0000-0003-0271-654X]
2018-09-17T07:37:06Z
2018-09-17T07:37:06Z
2019-02
López-Vicente M, Ben-Salem N. Computing structural and functional flow and sediment connectivity with a new aggregated index: A case study in a large Mediterranean catchment. Science of The Total Environment 651 (1): 179-191 (2019)
0048-9697
http://hdl.handle.net/10261/169757
10.1016/j.scitotenv.2018.09.170
1879-1026
http://dx.doi.org/10.13039/501100003329
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 FSC-st in the river and outlet were similar between both indices. Functional FSC (FSC-fn) was computed with AIC during 96 months (September 2009–August 2017) characterising the spatio-temporal dynamic at catchment scale (18% of coefficient of variation). FSC-fn was higher in September, October, June and July and lower during the period December–February. Variation of connectivity in the stream was higher than in the hillslopes. Modelling testing with river flow was satisfactory between November and March, and during the months with high discharge values and weak during the summer, suggesting different runoff and sediment responses over the year. The new AIC appeared as a suitable tool for geomorphic and hydrological studies at catchment scale.
eng
openAccess
Structural connectivity
Functional connectivity
Rainfall erosivity
Soil permeability
Spatio-temporal dynamic
Aggregated index of connectivity
Computing structural and functional flow and sediment connectivity with a new aggregated index: A case study in a large Mediterranean catchment
artículo
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URL
https://digital.csic.es/bitstream/10261/169757/1/Lopez-VicenteM_SciTotEnvironm_2018.pdf
File
MD5
261c79e5e0189e1fdcbe104061a39ce1
3200338
application/pdf
Lopez-VicenteM_SciTotEnvironm_2018.pdf