Dynamics of Sediments in Reservoir Inflows: A Case Study of the Skalka and Nechranice Reservoirs, Czech Republic

Pacina, Jan; Lenďáková, Zuzana; Štojdl, Jiří; Grygar, Tomáš Matys; Dolejš, Martin

doi:10.3390/ijgi9040258

Cited by 14 publications

(15 citation statements)

References 53 publications

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“…The accuracy of the acquired LiDAR data was tested within the B1 and B2 localities, and 154 control points were surveyed with RTK GNSS with a positional accuracy of 3-8 cm. The processed LiDAR data were compared with the control points, and the RMSE of elevations was 9.5 cm [36], which is sufficient (regarding the spatial extent of the aerial bombing crater features) for our purposes.…”

Section: Lidar Data Acquisition and Processingmentioning

confidence: 99%

Aerial Bombing Crater Identification: Exploitation of Precise Digital Terrain Models

Dolejš

Pacina

Veselý

et al. 2020

IJGI

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Places of past conflicts and persistent objects that reflect such events often attract the attention of archaeological prospection which facilitates the construction of conflict narratives. Field prospection as a precise method for localization of aerial bombing craters (as an example of such persistent features) is a highly time- and resource-consuming task. Therefore, methods for automatic identification of such features are evolving. We present a comparison of three methods for possible automatic crater detection based on (a) extraterrestrial crater detection algorithms, (b) geomorphology-based edge extraction, and (c) image pattern recognition via a state-of-the-art convolutional neural network (CNN). All methods were preliminarily tested on a case study of eight Second World War (WWII) aerial bombing crater sites in NW Czechia via Airborne Laser Scanned LiDAR-derived digital terrain models with different spatial resolutions. We found that extraterrestrial crater detection algorithms and geomorphology-based edge extraction methods yield worse results given the standard indices of precision and recall. By comparison, the CNN method utilized for a particular task achieved satisfying results, predominantly with 0.5 m/px resolution (which is often available at the country level) of the input raster. Nevertheless, overall performance with this resolution varies significantly among the sites. Therefore, the quality and readability of the input data are crucial factors for the successful acquisition of precise ordinance location identification.

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Section: Lidar Data Acquisition and Processingmentioning

confidence: 99%

Aerial Bombing Crater Identification: Exploitation of Precise Digital Terrain Models

Dolejš

Pacina

Veselý

et al. 2020

IJGI

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“…Georelief reconstruction based on archival data sources was introduced (Pacina et al., 2020). Clark and Casana (2016) and Sevara et al.…”

Section: Resultsmentioning

confidence: 99%

“…In this study, we focus on pre‐dam topography reconstruction; thus, the elevation information contained in the archival spatial data sources is required. The suitable data sources used for the georelief reconstruction represent old maps containing altimetric information in the form of contour lines (and elevation points) or archival aerial images with sufficient overlaps (Hughes, Mcdowell, & Marcus, 2006; Lane, Westaway, & Hicks, 2003; Pacina, Lenďáková, Štojdl, Matys Grygar, & Dolejš, 2020; Pacina et al., 2012; Puligle & Fava, 2013; Sevara, Verhoeven, Doneus, & Draganits, 2017).…”

Section: Introductionmentioning

confidence: 99%

“…Archival aerial photographs are irreplaceable data sources used for landscape restoration and landscape development analysis, cultural heritage documentation, and archeological research (Cowley, Standring, & Abicht, 2010; Pacina et al., 2012, 2020; Remondino, 2011).…”

Section: Introductionmentioning

confidence: 99%

“…Archival aerial photographs acquired with sufficient overlaps may be used to derive the digital surface model (DSM) using standard methods of photogrammetry or structure from motion (SfM) modeling (Cantoro, 2015; Puligle & Fava, 2013; Sevara et al., 2017). Archival aerial photographs are available mostly through national aerial image archives or repositories (Cantoro, 2015; Cowley, Ferguson, & Williams, 2013; Cowley & Stichelbaut, 2012; Pacina et al., 2020).…”

Section: Introductionmentioning

confidence: 99%

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Pre‐dam valley reconstruction based on archival spatial data sources: Methods, accuracy, and 3D printing possibilities

Pacina

Cajthaml

Kratochvilova

et al. 2021

Transactions in GIS

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Archival spatial data sources (maps and aerial photographs) allow reconstruction and 3D visualization of landscapes that have been altered by human activity. This article is dedicated to the reconstruction of the 300 km‐long pre‐dam valley of the Vltava River (Czech Republic, Europe) inundated by nine reservoirs built between 1930 and 1992. We used methods based on archival aerial photographs and old maps to reconstruct pre‐dam georelief, which is exceptional because the total area subject to the reconstruction is 1,670 km2. We found that old maps are preferred for terrain reconstruction. The map series “State Map Derived 1:5,000” released between 1950 and 1959 was chosen as the most suitable data source for the pre‐dam valley reconstruction because this map series covers the entire area of interest with elevation information. Based on the processed maps, more than 26,000 km of contour lines were derived by semi‐automatic vectorization. The resulting pre‐dam digital elevation model (DEM) was created using a combination of interpolation techniques. We demonstrated that the methods used for georelief reconstruction under standard conditions should be used carefully while working with such large areas. Geostatistical analysis was performed to verify the accuracy of the resulting DEM. The differences between the model and LiDAR surveyed data were analyzed from three points of view: spatial autocorrelation, normality, and elevation stability. We tested several 3D printing methods for producing a realistic 3D model with a texture applied. The computer numerical control (CNC) milling method was chosen to produce 3D models of the three reservoirs at scales of 1:8,000 and 1:6,000.

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115 years of sediment deposition in a reservoir in Central Europe: Topographic change detection

Stauch,

Dörwald,

Esch

et al. 2023

Earth Surf Processes Landf

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Reservoirs have become an important component in the worldwide river sediment flux. Reservoirs prevent downstream sediment transport and have become a major sediment sink. In this study, sediment deposition during the last 115 years in the Urft Reservoir in western Germany is reconstructed. The Urft Reservoir is the oldest reservoir in the Eifel Mountains and was almost completely drained in 2020. This enabled a detailed mapping of the lake bottom using an unmanned aerial system and the computation of a high‐resolution digital surface model. Topographic maps with a nominal resolution of 1:1000 from the time prior to the construction of the dam (around 1900) were used to construct a pre‐reservoir elevation model. A digital elevation model of difference (DoD) was calculated from these two datasets for the reservoir floor (0.72 km2). Based on the DoD, a net sediment accumulation of 1.16 × 106 m3 was calculated alongside a propagated volume error of 6.91 × 105 m3, resulting in a mean accumulation of 1.54 m. Conservative vertical error propagation results in an average level of detection (LoD) of 1.8 m. In contrast, the comparison of the DoD with 47 cores in the upper part of the reservoir showed a mean difference of −0.11 m, indicating a high, independently assessed accuracy of the DoD. Three depositional hotspots were identified in the reservoir. One is close to the Urft dam where very fine sediments are draped across the pre‐reservoir topography. Two areas are related to reservoir management. Sediment deposition in the Urft Reservoir has been comparably low in comparison to other regions globally, resulting in a 3.25% ± 1.93% loss of reservoir volume between 1905 and 2020. To analyse the effect of strong flooding events, a subset of the reservoir was analysed after an extreme event in July 2021, but accumulation did almost entirely not exceed the LoD.

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Dynamics of Sediments in Reservoir Inflows: A Case Study of the Skalka and Nechranice Reservoirs, Czech Republic

Cited by 14 publications

References 53 publications

Aerial Bombing Crater Identification: Exploitation of Precise Digital Terrain Models

Aerial Bombing Crater Identification: Exploitation of Precise Digital Terrain Models

Pre‐dam valley reconstruction based on archival spatial data sources: Methods, accuracy, and 3D printing possibilities

115 years of sediment deposition in a reservoir in Central Europe: Topographic change detection

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