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2 2019

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Węzłowe i strefowe rozwiązania modelu rynku energii elektrycznej

Przygrodzki Maksymilian, Gwóźdź Rafał, Wakuliński Łukasz

Przegląd Elektrotechniczny

2019

R. 95, nr 10

98--101

W artykule przedstawiono i porównano dwa zasadniczo różne modele rynkowe, a mianowicie model strefowy oraz model węzłowy. Dla każdego z modeli uwypuklono jego cechy pozytywne oraz negatywne oraz oceniono pod kątem ich przydatności do rozliczeń i powiązania z utrzymaniem bezpieczeństwa funkcjonowania systemu elektroenergetycznego.

The article presents and compares two fundamentally different market models, namely the zonal model and the nodal model. For each of the models, its positive and negative features were emphasized and assessed in terms of their suitability for billing and connection with maintaining the security of the power system operation.

Geophysical and geotechnical approach to a landslide stability assessment: a case study

Pasierb Bernadetta, Grodecki Michał, Gwóźdź Rafał

Acta Geophysica

2019

Vol. 67, no. 6

1823--1834

Landslides are complex phenomena, and the main factors that have a significant impact on their behavior are changes in slope inclination geometry and changes in water conditions. The main purpose of this work was to evaluate current conditions of the landslide in Brzozówka, near Cracow (Poland), and analyzing how different saturations of soil influence the stability of the landslide. The combination of geophysical and geotechnical research, such as electrical resistivity tomography (ERT), cone penetration testing, drilling and laboratory tests as well as a comprehensive analysis of their results, provided reliable information on the geological structure and geotechnical parameters of the landslide. The results were used in numerical simulations of the landslide stability, in which a two-phase model (soil and water) was assumed that included the effective soil strength parameters and the transient flow conditions as well as a partial saturation zone. The sliding surface obtained from the numerical modeling was almost flat, which was confirmed by the ERT method. It was proved that the landslide occurred when the saturation of the upper part of the slope exceeded 0.8. Obtained results are useful for engineering practice.