Meandering In Transition
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Meandering in Transition
Author: Ostap Kushnir
language: en
Publisher: Bloomsbury Publishing PLC
Release Date: 2021-08-19
This edited collection addresses the dynamics of the post-Communist transition in Central Eastern Europe. Its contributors present a detailed analysis of the events unfolding during the last three decades in the region, focusing in particular on identity-building processes and reforms in Belarus, Bulgaria, Czechia, Estonia, Hungary, Latvia, Lithuania, Moldova, Poland, Romania, Slovakia, and Ukraine. The contributors outline reasons why some of these states accomplished a decisive break with the Communist past and became members of European and transatlantic structures, while some opted for pseudo-transition and fostered hybrid political regimes, jeopardizing their genuine integration with the West. A group of states which decided to preserve their Communist legacy is also explained. The collection describes and scrutinizes the formation of geopolitical affiliations and the evolution of discourses of belonging. It also traces the fluctuating dynamics of national decision-making and institution-building, as many of the post-Communist states reconsider and re-elaborate their initial ideas and visions of Europe today. Finally, the collection brings to light the rapidly changing perceptions of the region by the major global actors—the European Union, People’s Republic of China, Russian Federation, and others.
Analysis and Modelling of River Meandering
This thesis examines the morphological changes of non-tidal meandering rivers at the spatial scale of several meanders. With this purpose, a physics-based mathematical model, MIANDRAS, has been developed for the simulation of the medium-term to long-term evolution of meandering rivers. Application to several real rivers shows that MIANDRAS can properly simulate both equilibrium river bed topography and planimetric changes. Three models of different complexity can be obtained by applying different degrees of simplification to the equations. These models, along with experimental tests and field data, constitute the tools for several analyses. At conditions of initiation of meandering, it is found that river bends can migrate upstream and downstream. This depends on meander wave length and width-to-depth ratio, irrespective of whether the parameters are in the subresonant or the superresonant range.
Theoretical Morphodynamics: River Meandering
Author: Giovanni Seminara
language: en
Publisher: Firenze University Press
Release Date: 2024-04-05
This monograph discusses the mechanics of Meandering Rivers with the help of the mathematical and modeling tools built up in the previous monograph of the same Authors (monograph 1 of the present series). After introducing the reader to the ubiquitous character of meandering streams, we discuss the hydrodynamics of curved channels with fixed beds and banks. Next, we extend the analysis to account for the mobile character of the bed and show that it gives rise to the alternate sequence of riffles and pools that characterize river meanders. Allowing for the erodible character of the river banks then allows to build up a rational theory of meander formation able to explain most of the features observed in nature: meander growth, migration, skewing, multiple loops, cutoffs and meander belts.