Application of GIS procedure for river terrace extraction from a LiDAR-based digital elevation model : the Sava River Valley NW of Zagreb, Croatia

Scientific paper - Original scientific paper

• Title (croatian): Primjena GIS-a za izdvajanje riječnih terasa na digitalnome modelu terena izrađenome pomoću LIDAR-a, dolina rijeke Save, SZ od Zagreba
• Author: Neven Trenc
• Author: Bojan Matoš
• Author: Josipa Velić
• Author: Dario Perković
• Author's institution: University of Zagreb; Faculty of Mining, Geology and Petroleum Engineering; (Department of Geology and Geological Engineering)
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Geology
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mining, Petroleum and Geology Engineering

Abstract (english)

River terraces and floodplains indicate channel-sediment dynamics and represent important landform features, which can be used to untangle the evolutionary history of climate and tectonic conditions in a certain area. With the availability of high-resolution topographic data, it has recently become feasible to apply GIS procedures for the identification of these subtle landform features. In this study, the TerEx Toolbox, a GIS extension for semiautomatic terrace extraction was applied on the LiDAR based DEM of the Sava River, west of Zagreb in Croatia. The aim of this research was to compare results obtained by TerEx to the existing geological map from the 1970s, which shows sediments of the recent flow (routinely flooded area) and two abandoned Holocene river terraces in the study area. The TerEx output was validated using hillshaded DEM, a historical map of the study area, orthophoto imagery, topographic cross sections and field investigations. TerEx has successfully extracted Holocene terraces and risers shown on the geological map but in some parts of the study area, their position and extent was different. The presented study shows that results obtained by TerEx, in particular if used in combination with other data sources, can effectively focus fieldwork and contribute to new unbiased interpretation of terrain morphology.

Abstract (croatian)

Riječne terase i poplavne ravnice pokazatelj su dinamike korita i sedimenta te predstavljaju važne reljefne oblike koje je moguće iskoristiti za istraživanje razvoja klimatskih uvjeta i tektonskih odnosa. Dostupnost topografskih podataka visoke razlučivosti omogućila je primjenu GIS postupaka za njihovo prepoznavanje. U ovome istraživanju TerEx Toolbox, GIS aplikacija za poluautomatsko izdvajanje terasa primijenjena je na DEM izrađen pomoću LiDAR-a za područje rijeke Save u Hrvatskoj zapadno od Zagreba. Cilj je istraživanja bio usporediti osnovnu geološku kartu izrađenu sedamdesetih godina prošloga stoljeća koja pokazuje na ovome području sedimente recentnoga toka (redovito plavljen) i dvije holocenske riječne terase. Analiza rezultata TerExa provedena je korištenjem DEM-a prikazanoga kao osjenčani reljef, povijesnih karata, ortofoto snimaka, topografskih profila i terenskih istraživanja. Rezultati su pokazali da je aplikacija TerEx uspješno izdvojila obje holocenske riječne terase i njihove strmce, ali je pokazala neke razlike u njihovu protezanju i smještaju. Provedeno istraživanje pokazuje da rezultati dobiveni pomoću aplikacije TerEx posebice ako se koriste zajedno s drugim izvorima podataka mogu učinkovito usmjeriti terenski rad i doprinijeti novoj nepristranoj interpretaciju morfologije nekoga područja.

• Keywords (english): fluvial morphology; terraces; Holocene; DEM; LiDAR; TerEx (GIS)
• Keywords (croatian): fluvijalna morfologija; riječne terase; holocen; DEM; LiDAR; TerEx (GIS)
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review - international
• Publication version: Published version
• Journal title: Rudarsko-geološko-naftni zbornik
• Numbering: vol. 34, no. 1, pp. 59-70
• e-ISSN: 1849-0409
• DOI: https://doi.org/10.17794/rgn.2019.1.6
• URN:NBN: urn:nbn:hr:169:287324
• Publication: 2019
• Document URL: https://hrcak.srce.hr/216284
• Type of resource: Text
• Access conditions: Open access
• Created on: 2021-04-21 12:34:34