Comparing a hydrodynamic model from fifth generation DTM data and a model from data modified by means of CroSolver tool

Abstract

The contemporary regional geography paradigm is characterized by emphasizing the socially constructed nature of regions. However, the discussion on the conceptualization of region is very rich, it does not reach universal conclusion. Such a universal conceptualization is probably neither possible nor desirable. This paper aims to contribute to the ongoing discussion. It examines the various approaches towards region with special focus on the conceptualization of the institutionalization of the region based on the heuristic literature review and it attempts to propose more complex (but not ultimate) theoretical conceptualization of region that should enable to bridge the duality of region; addressed as an "animate", constantly changing, phenomenon which also makes it a resource for regional actors to meet their particular goals, one that people may perceive and feel attached to while further mediating their images thereof. The paper builds upon the Lefebvre's theory of the societal production of space and the Paasi's theory of the institutionalization of region and presents the idea of the societal production of region. It argues that any complex approach to region must incorporate three levels of region: "given" (practice of region), "made" (representation of region) and "perceived" (idea of region). Better understanding of the concept of region is still more necessary and relevant especially due to the increasing pressure on the applicability of regional research. Thus, the paper suggests the closer insight into the interrelation of three mentioned levels of region is crucial from the view of the contemporary state of art. This text is also published in Czech as the official on-line supplement of the article.

River Bathymetry Model Based on Floodplain Topography

“…These differences were diminishing with increasing flow, but nevertheless were >20% for the Q 100 flow rate. Similar results had been presented in the works of Bures et al [18] and Roub et al [42]. In both those cases, software-modified DEMs (CRO, BAT) provided better results than the ALS model.…”

“…Similar poor results could be expected from other remote-sensing methods [8][9][10][11]. The error produced by these models depends on the size of the neglected flow area of the river channel [18,42]. Although differential absorption LiDAR (DiAL) technologies may constitute exceptions to this general case [14,15], even using DiAL technology does not ensure any increase in accuracy.…”

“…Both evaluated errors for the ALS model are >1. Note that the mean water depth in the channel at the time of acquiring ALS data was around 1 m. This suggests that the ALS model neglected almost the entire flow area of the river channel [16,20,28,42]. The RMSE and MAE values for the CRO model were 0.46 and 0.36 m, respectively.…”

“…The data obtained by using an ADCP measurement device have the depth range 0.2-80 m and accuracy of +/−1% of the depth. The ADCP technology was successfully applied in recent works [18,41,42]. The data were sampled as a set of single cross-sections.…”

Evaluation of riverbed representation methods for one‐dimensional flood hydraulics model

“…The ALS data were preprocessed using CroSolver (Cross‐section Solver ToolBox), in order to represent the riverbed. CroSolver is a tool for geometric data preparation (artificially sinking of the terrain) on the basis of fusion of hydrological data and ALS data and is an extension module of ArcGIS software written in Python (Roub et al , ). The input data to the tools comprise the vectorised stream centreline and the DEM.…”