Elsevier

CATENA

Volume 203, August 2021, 105307
CATENA

Is digital shoreline analysis system “fit” for gully erosion assessment?

https://doi.org/10.1016/j.catena.2021.105307Get rights and content
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Highlights

  • Employing the DSAS for soil erosion assessment (gully erosion).

  • Testing the strenghtness and weakness of DSAS for three types of gully erosion.

  • A set of “standardised” input parameters were established for the three types of gully.

  • The obtained average erosion rates are comparable to the ones from literature.

  • The DSAS is “fit” for gully erosion assessment, but “unfit” for future gully development.

Abstract

Gully erosion represents one of the most destructive geomorphological processes at a global level. Modern methods of gully erosion measurement are typically derived from earlier techniques that have since become outdated. The increasing capabilities of technology had led to new ways of quantifying soil erosion processes (e.g. gully erosion) which must be used in erosion assessment. A tool designed to assess coastal erosion – Digital Shoreline Analysis System (DSAS), is applied to the analysis of gully erosion. To assess the usefulness of this technique, three different types of gullies were chosen (dendritic, linear, and linear that became dendritic) from the Moldavian Plateau of Romania were chosen. Different parameters (SCE, EPR, NSM, and LRR) were tested and analysed. The best results were obtained in the case of dendritic gullies with specific adjustments to the processing values (smoothing distance set to >1000 and transect spacing at values >5 m). In the case of linear gullies, the smoothing distance needs to be set to lower values compared to dendritic gullies (<= 1000). When it comes to the linear gully that evolved into a dendritic gully, the recommendation is to use smoothing distances with high values (>1000) and transect spacing values >10 m. The average erosion rates obtained with the help of DSAS are very close to the ones from the literature of gully erosion on the Moldavian Plateau in Romania (over – 1.5 m/yr and under – 1 m/yr for gullies cut in sandy and clay deposits, respectively). This leads us to the conclusion that the DSAS tool is “fit” for gully erosion assessment. However, like any other software, it has limitations and possible disadvantages. The tool can be successfully used and applied in the field of soil erosion mitigation, disaster risk reduction, environmental and cultural heritage protection and in reaching the UNSDG.

Keywords

Gully erosion
Digital shoreline analysis system
Monitoring
Cultural heritage
North-eastern Romania
Moldavian Plateau

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