Niestateczne skarpy tamy zbiornika Nova Bystrica

Water reservoir Nova Bystrica is located in the northern part of Slovakia, about 6 kilometers southward of the border with Poland and serves to supply the population with drinking water. Two landslides (slope deformations) have affected a slope adjacent to the water reservoir dam. The distance between the dam left-hand side and the landslides is about 250 m. The first landslide is active; its toe extends to the reservoir water and has destroyed the forest road. The second slope deformation, which is considerably larger than the first one, is a block deformation allocated above the forest road. In the contribution, basing on the ongoing monitoring the authors described the stability of both landslides. According to the slope stability calculations they also analyzed the activity of both landslides and forecasted their further development with regard to the operation of the water reservoir itself. In conclusions there are recommendations for further monitoring of both slope deformations and also there are suggests for additional research works.Zbiornik wodny zapewniający mieszkańcom wodę pitną Nova Bystrica położony jest na północy Słowacji w odległości ok. 6 km od granicy z Polską. Na zboczach przyległych do tamy zbiornika miały miejsce dwa osuwiska. Odległość pomiędzy lewą częścią tamy a miejscem utraty stateczności zbocza wynosiła 250 m. Pierwsze osuwisko jest cały czas aktywne, a jego jęzor wchodzi do zbiornika i niszczy drogę leśną pośrodku zbocza. Drugie osuwisko, o wiele większe niż pierwsze, jest blokową deformacją zlokalizowaną powyżej ww. drogi. Bazując na prowadzonym w tym rejonie monitoringu, autorzy określili stateczność zboczy obu osuwisk. W oparciu o obliczenia wskaźników stateczności, przeanalizowali również aktywność obu osuwisk z uwzględnieniem przyszłych ruchów wody w zbiorniku. We wnioskach podano zalecenia dotyczące dalszego monitoringu deformacji zachodzących na zboczu osuwisk oraz sugestie dalszych prac badawczych w tym zakresie

THE IRIS FLUORESCEIN ANGIOGRAPHY AS A METHOD FOR DETERMINATION OF VASCULAR CHANGES AT VARIOUS STAGES OF PSEUDOEXFOLIATION SYNDROME

Purpose. To define vascular changes of the iris in cataract patients with various stages of pseudoexfoliation syndrome (PEX) using the iris fluorescein angiography (IFAG) and to confirm them morphologically.Material and methods. In the study 60 patients were divided into two groups: the group 1 consisted of 30 patients (30 eyes) with cataract and PEX stage I, the group 2 included 30 patients (30 eyes) with cataract and PEX stage II according to the classifications by A.P. Nesterov (2008) and H.M. Nizankowska (2001). The iris fluorescein angiography was performed for all patients, it was estimated the architectonic of the iris vessels, theirs permeability and time parameters. The morphological part was presented by 16 donor eyes which had not passed selection to transplantation.Results. Different degrees of microcirculation violations in the anterior segment of the eye were revealed in the group 1 and the group 2 using the iris fluorescein angiography. Morphologically destructions of epithelium and basal membrane of small and medium arteries were observed in donor eyes with PEX signs.Conclusion. The obtained data testify the existence of the arterial ischemia in the iris. Changes founded in the vascular bed of the iris correlate with the degree of clinical degenerative changes of the anterior segment of the eye. It should be mentioned that the progression of PEХ stage generated aggravating of changes in the vessels of the iris, like as the deterioration of microcirculation (according to the time parameters), the loss of crimp radial artery, the decrease in their number, the increased permeability and the appearance of neovascularization