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Geosciences 2018, 8(2), 48; https://doi.org/10.3390/geosciences8020048

Assessment of a Simplified Connectivity Index and Specific Sediment Potential in River Basins by Means of Geomorphometric Tools

1
ENEA, Italian National Agency for New Technologies, Energy and Sustainable Economic Development, Territorial and Production Systems Sustainability Department, Casaccia Research Centre, Via Anguillarese 301, 00123 Santa Maria di Galeria (Roma), Italy
2
ENEA, Italian National Agency for New Technologies, Energy and Sustainable Economic Development, Territorial and Production Systems Sustainability Department, Portici Research Centre, Piazzale E. Fermi 1, 80055 Portici (NA), Italy
*
Author to whom correspondence should be addressed.
Received: 28 November 2017 / Revised: 25 January 2018 / Accepted: 28 January 2018 / Published: 30 January 2018
(This article belongs to the Special Issue Soil Hydrology and Erosion)
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Abstract

Sediment connectivity is a major topic in recent research because of its relevance in the characterization of the morphology of river systems and assessing of sediment transport and deposition. Currently, the connectivity indices found in the literature are generally dimensionless and need to be coupled with quantitative soil-loss data for land management and design purposes. In the present work, a simple methodology is proposed to assess two different indices, namely, the simplified connectivity index (SCI) and the specific sediment potential (SSP), based on geomorphometric tools that are commonly available in commercial and open-source geographic information system (GIS) platforms. The proposed metrics allows us to easily assess both the SCI and the SSP as functions of the estimated soil erosion per unit area of the catchment and of the inverse distance of each unit area from the river outlet, this distance being measured along the network path. The proposed indices have been devised to express, respectively, the potential sediment transfer ability and the sediment mass potentially available at a given section of the drainage network. In addition to other parameters used to describe the catchment characteristics potentially affecting the river sediment delivery capacity, the SCI and SSP indices can help to refine theoretical models in order to assess the sediment yield (SY) in ungauged river basins. View Full-Text
Keywords: soil loss; sediment yield; connectivity; QGIS; GRASS GIS soil loss; sediment yield; connectivity; QGIS; GRASS GIS
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Grauso, S.; Pasanisi, F.; Tebano, C. Assessment of a Simplified Connectivity Index and Specific Sediment Potential in River Basins by Means of Geomorphometric Tools. Geosciences 2018, 8, 48.

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