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Geomatics-based assessment of the neotectonic landscape evolution along the tebessa-morsott-youkous collapsed basin, Algeria

Taib Hassan, Benabbas Chaouki, Khiari Abdelkader, Hadji Riheb, Haythem Dinar

Geomatics, Landmanagement and Landscape

2022

no. 3

131--146

The neo-tectonic research is interested in the study of the movements of Earth’s crust in recent geological times. It could explain the deformation mechanisms that lead to the structuring of drainage catchments. The Morsott-Tebessa-Youkous (Chabro) collapsed basin corresponds to a subsiding depression framed by brittle structures and filled with thick deposits. Our work aims to unveil the neo-tectonic activity and reconstruct the morphometric evolution of the landscape and the drainage network of the basin. For this task, our investigation applies a quantitative analysis of geomorphic indices extracted from the DEM of the study area. We used a GIS-based approach to compile seven morphometric factors namely Integral Hypsometry (HI), the Sinuosity of mountain fronts (Smf), the Valley Floor width to height ratio (VF), the Asymmetry Factor (AF), Basin Shape index (BS), and the topography (T). All these thematic parameters were processed in a Geo-database to calculate the study area’s Relative Tectonic Activity Index (IRAT) as a result. The IRAT map was categorized into three classes. The result highlighted the distribution of relative tectonic activity in the region and unveiled some unknown faults. It associated the sinuosity of rivers and the deformation of the substratum with active tectonic anomalies. This research work succeeded in drawing up a new scheme of the neo-tectonic activity and morphostructural evolution in the collapsed basin.

Zagadnienie tautochrony

Górecki H.

Automatyka / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie

2011

T. 15, z. 1

47-52

W pracy przedstawiono rozwiązanie teoretyczne ruchu wahadła cykloidalnego. Czas wahań tego wahadła nie zależy od amplitudy wychylenia. Umożliwiało to konstrukcje zegarów bardzo dokładnych. Okazało się, że krzywa zwana tautochroną jest równocześnie krzywą najszybszego spadku w polu grawitacyjnym, to jest brachistochroną. Pokazano również narodzenie się krzywej, tak popularnej w elektrotechnice, to jest sinusoidę.

In the paper, a theoretical solution for the motion of cycloidal pendulum is presented. The period of oscillations of such a pendulum is independent of the amplitude of oscillations. This enables construction of very precise clocks. It turns out that the curve called tautochrone is, at the same time, the curve of quickest descent in the gravitational field, that is, brachystochrone. The birth of the sinusoid curve, so popular in electrical engineering, is also described.