Wyniki wyszukiwania - BazTech

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Analysis of extreme flow uncertainty impact on size of flood hazard zones for the Wronki gauge station in the Warta river

Dysarz Tomasz, Wicher-Dysarz Joanna, Sojka Mariusz, Jaskuła Joanna

Acta Geophysica

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2019

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Vol. 67, no. 2

661--676

EN

In this paper, the impact of maximum flow uncertainty on flood hazard zone is analyzed. Two factors are taken into account: (1) the method for determination of maximum flows and (2) the limited length of the data series available for calculations. The importance of this problem is a consequence of the implementation of the EU Flood Directive in all EU member states. The factors mentioned seem to be among the most important elements responsible for potential uncertainty and inaccuracy of the developed flood hazard maps. Two methods are analyzed, namely the quantiles method and the maximum likelihood method. The maximum flows are estimated for the Wronki gauge station located in the reach of the Warta river. This simple river system is located in the central part of Poland. The length of the available data is 44 years. Hence, the series of the lengths 40, 30 and 20 years are tested and compared with reference calculations for 44 years. The hydrodynamic model HECRAS is used to calculate water surface profiles in steady state flow. The Python scripting language is applied for automation of HEC-RAS calculations and processing of final results in the form of inundation maps. The number of trials for each factor is not huge to keep the presented methodology useful in practice. The chosen measure of uncertainty is the range of variability for maximum flow values as well as inundation areas. The estimated values stressed the great importance of the factors analyzed for the uncertainty of the maximum flows as well as inundation areas. The impact of the data series length on the maximum flows is straightforward; a shorter data series gives a wider range of variability. However, the dependencies between other factors are more complex. Hence, the application of methodology based on the simulation and GIS data processing for assessment of this problem seems to be quite a good approach.

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Influence of Physiographic Conditions on the Quality of Agricultural Production Area

Prus B., Salata T.

Geomatics and Environmental Engineering

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2014

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Vol. 8, no. 4

55--65

EN

The paper presents results of the analysis of the influence of physiographic conditions on the quality of agricultural production area. The research was based on the substantive and measurable aspect of agricultural production area. The purpose of the article was to analyze and evaluate resources of the agricultural production area for their suitability in agriculture. The paper analyzes the difficulty of cultivation due to declines in land and risk of soil erosion by surface water. These issues required taking into account land relief configuration. For this purpose, a digital terrain model was generated. The study was performed for the area of Tomice commune. The analysis of selected environmental elements of the agricultural production area was performed with the help of basic geoprocessing techniques. The article is a continuation of previous analyses of the quality and usefulness of agricultural soils conducted by the authors. The first part includes an analysis of soil quality and agricultural utility. The paper also evaluates categories for soil protection and degrees of water logging.

PL

W pracy przedstawiono wyniki analizy wpływu wybranych uwarunkowań fizjograficznych na jakość rolniczej przestrzeni produkcyjnej. Badania opierają się na założeniu o materialnym i mierzalnym ujęciu rolniczej przestrzeni produkcyjnej. Celem artykułu była analiza i ocena zasobów rolniczej przestrzeni produkcyjnej pod względem przydatności terenów do pełnienia funkcji rolniczej. Przeprowadzono analizę trudności uprawy roli ze względu na występujące spadki terenu oraz zobrazowano analizę potencjalnego zagrożenia gleb erozją wodną powierzchniową. Zagadnienia te wymagały uwzględnienia uwarunkowań wynikających z ukształtowania terenu. W tym celu został wygenerowany numeryczny model terenu. Badaniami objęto obszar gminy Tomice. Do modelowania wybranych elementów środowiskowych rolniczej przestrzeni produkcyjnej zastosowane zostały podstawowe techniki geoprocessingu. Artykuł jest kontynuacją prowadzonych przez autorów analiz [20] zasobów rolniczej przestrzeni produkcyjnej. W pierwszej części przeanalizowano jakość i przydatność rolniczą gleb. Ocenie poddano także kategorie ochrony oraz stopień uwilgotnienia gleb.

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Semi-automatic geo-processing procedure for the vulnerability mapping of industrial facilities in areas with the potential volcanic ash fallout

Ancione G., Milazzo M. F., Salzano E., Maschio G.

Journal of Polish Safety and Reliability Association

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2013

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Vol. 4, No. 1

1--8

EN

Following recent severe natural events, attention has been focused on industrial installations located in areas prone to natural hazards. This work concerns the study of volcanic Na-Tech events (i.e. technological risks triggered by natural causes) and aims at defining a procedure for the representation of the vulnerability of industrial facilities in areas with the potential volcanic ash fallout by means a Geographical Information System (GIS). Here, we focused on the construction of a semi-automatic procedure for the vulnerability mapping for cases where input data is very limited; it is based on the use of a specific tool named ModelBuilder of the ArcGIS software.