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Determination of catchment-scale hydrogeological parameters of fractured crystalline rocks using streamflow recession analysis – an example from south-western Poland

Olichwer Tomasz

Geology, Geophysics and Environment

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2024

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Vol. 50, no. 2

119--130

EN

To estimate catchment-scale hydrogeological parameters such as hydraulic conductivity (k) and specific yield (Sy), the streamflow recession analysis method proposed by Brutsaert and Nieber (1977) was used. The analysis employed the technique of fitting a theoretical recession curve to the observed data in which three points of transition between the short- and long-term flow regimes were determined. This method is a simple, fast, and cheap alternative to standard point-based hydrogeological methods using investigations carried out in hydrogeological boreholes. The study area covered the mountainous catchment of the Biała Lądecka River, located in south-western Poland and composed of metamorphic rocks. The hydrogeological environments drained by the Biała Lądecka are two zones, i.e. the zone of weathered covers and rock debris and the zone of fractured rock mass. The k values determined based on the recession analysis were in the boundary zone of the range from to m/s and they represented the upper range of the values reported in the literature (from to m/s). The Sy values at a level of 0.38–1.02%, in turn, entirely fitted the literature data. The results confirm the thesis that the recession method, despite certain limitations in terms of its applicability, can be well adapted to the conditions of a mountainous catchment composed of crystalline rocks where a cool temperate climate prevails.

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Wybrane problemy prowadzenia działań bojowych w terenie górzystym

Szkołuda D.

Kwartalnik Bellona

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2017

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Nr 2

97--106

PL

Autor omawia wybrane problemy prowadzenia walki w terenie górzystym. Złożoność działań oraz zmienność warunków atmosferycznych sprawiają, że organizowanie i prowadzenie walki w takim terenie jest jednym z najtrudniejszych zadań poddziałów/oddziałów. Zadania te mogą obejmować wykonanie marszu, urządzenie zasadzki lub zorganizowanie wypadu, a także uchwycenie przełęczy, wąwozu lub też ich utrzymanie. W artykule przedstawiono specyfikę zadań wykonywanych w terenie górzystym oraz graficzne przykłady ich wykonania.

EN

The author discusses certain problems connected with conducting military operations in mountainous terrain. The complexity of operations and changeability of weather conditions make organizing and undertaking combat in such terrain one of the most difficult tasks of military units. The tasks can involve marching, setting up an ambush or organizing a sortie, as well as seizing a pass, a gorge, or holding them. The article presents the specificity and graphic examples of conducting tasks in mountainous areas.

3

Initial state evaluation algorithm using fuzzy Bellman method

Gruszecki J., Basmadji F. L.

Journal of KONES

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2017

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Vol. 24, No. 1

159--169

EN

The problem of UAV control along a predefined trajectory is a well know problem and there are several methods that could accomplish this task. However, adding final conditions that the UAV have to meet at the end of the trajectory makes this problem more difficult. In this article, the authors present a fuzzy based method that is not time consuming and can solve this problem. The algorithm for flying at low altitudes are aimed to ensure the maximum safety of the flight by considering only the acceleration values that are possible to achieve by the object. In particular, the article presents: flight trajectory over mountainous terrain, the structure of altitude control system, the structure of normal acceleration control system, exemplary calculations and an object with velocity equals, membership functions of angle of attack, solutions' illustration, flight path angle and pitch angle along the trajectory, the demanded and actual normal acceleration along the trajectory and flying object trajectory.