Next Article in Journal
Spatiotemporal Analysis of Tourists and Residents in Shanghai Based on Location-Based Social Network’s Data from Weibo
Next Article in Special Issue
Intelligent High-Resolution Geological Mapping Based on SLIC-CNN
Previous Article in Journal
Analysis of Spatial Interaction between Different Food Cultures in South and North China: Practices from People’s Daily Life
Open AccessArticle

SLiX: A GIS Toolbox to Support Along-Stream Knickzones Detection through the Computation and Mapping of the Stream Length-Gradient (SL) Index

1
Dipartimento di Scienze Pure ed Applicate—Università degli Studi di Urbino “Carlo Bo”, Via Cà Le Suore, 61029 Urbino (PU), Italy
2
Dipartimento di Scienze della Terra—Sapienza Università di Roma, P.le Aldo Moro, 00185 Rome, Italy
*
Author to whom correspondence should be addressed.
ISPRS Int. J. Geo-Inf. 2020, 9(2), 69; https://doi.org/10.3390/ijgi9020069
Received: 14 December 2019 / Revised: 11 January 2020 / Accepted: 19 January 2020 / Published: 21 January 2020
The stream length-gradient (SL) index is widely used in geomorphological studies aimed at detecting knickzones, which are extensive along-stream deviations from the typical concave-up shape assumed for stream longitudinal profiles at steady-state conditions. In particular, SL was practical for identifying anomalous gradients along bedrock stream channels in mountainous catchments. This work presents the GIS toolbox SLiX designed to extract values of the SL index, starting from Digital Elevation Models (DEMs). SLiX is also suitable for the spatial analysis of the SL values, allowing for the identification of landscape portions where anomalous high values of SL occur and, consequently, those catchment sectors where stream channels show peaks in the erosional dynamic. The SLiX main outputs are (i) point shapefiles containing, among stream channels attributes, the extracted values of SL along the stream network analyzed, and (ii) SL anomaly maps in GeoTIFF format, computed through the Hotspot and Cluster Analysis (HCA), that permit the detection of the catchment sectors where the major SL anomalies occur and consequently the principal knickzones. The application of the proposed tool within an experimental catchment located in the Northern Apennines of Italy demonstrated the proper functionality and the potential of its use for different geomorphological and environmental studies. The accurate and cost-effective detection of anomalous changes in stream gradient ensured by SLiX is of great interest and can be useful for studies aimed at unravelling the Earth processes responsible of their formation (e.g., active hillslope processes, such as landslides directly interacting with the streambed, presence of geological structures, and meander cut-off). The applications of SLiX have clear implications for preliminary analyses, at a regional scale in different morpho-climatic contexts, for the hydrological management of river basins and/or to prevent geological hazards related to the fluvial erosional dynamics. View Full-Text
Keywords: geomorphometry; SL index; stream longitudinal profiles; GIS toolbox; landscape management geomorphometry; SL index; stream longitudinal profiles; GIS toolbox; landscape management
Show Figures

Graphical abstract

MDPI and ACS Style

Piacentini, D.; Troiani, F.; Servizi, T.; Nesci, O.; Veneri, F. SLiX: A GIS Toolbox to Support Along-Stream Knickzones Detection through the Computation and Mapping of the Stream Length-Gradient (SL) Index. ISPRS Int. J. Geo-Inf. 2020, 9, 69.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop