Fluvial Meanders and Their Sedimentary Products in the Rock Record (IAS SP 48)

Fluvial Meanders and Their Sedimentary Products in the Rock Record (IAS SP 48)
Author: Massimiliano Ghinassi
Publisher: John Wiley & Sons
Total Pages: 602
Release: 2019-01-22
Genre: Science
ISBN: 1119424461

The sinuous form and peculiar evolution of meandering rivers has long captured the imagination of people. Today, meandering rivers exist in some of the most densely populated areas in the World, where they provide environmental and economic wealth and opportunities, as well as posing hazards. Through geological time, the ancestors of these modern meanders built deposits that are now host to mineral resources, groundwater, and hydrocarbons. This Special Publication illustrates the breadth of current research on meandering rivers and their deposits. The collection of research papers demonstrates the state of science on fluvial process–product relationships. The articles cover fundamental and applied studies of both modern and ancient rivers, are based on state-of-the-art technology, include complementary philosophical approaches, and span a wide range of spatial and temporal scales. This book includes some of the most recent advances in the study of the morphodynamics and sedimentology of meandering rivers, and is an important resource for those who want to investigate fluvial systems and their deposits.

Analysis and Modelling of River Meandering

Analysis and Modelling of River Meandering
Author: Alessandra Crosato
Publisher: IOS Press
Total Pages: 272
Release: 2008
Genre: Computers
ISBN: 9781586039158

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.

River, Coastal and Estuarine Morphodynamics. RCEM 2009, Two Volume Set

River, Coastal and Estuarine Morphodynamics. RCEM 2009, Two Volume Set
Author: Carlos Vionnet
Publisher: CRC Press
Total Pages: 1116
Release: 2018-10-03
Genre: Science
ISBN: 1482266601

Coastal, estuarine, fluvial and submarine morphodynamics encompass some of the leading processes shaping our planet. They stem mainly, but not only, from the interaction of water in motion and movable sediment boundaries, resulting in morphological changes produced by erosion, transport and deposition of sediments that generate a variety of landsca

Theoretical Morphodynamics: River Meandering

Theoretical Morphodynamics: River Meandering
Author: Giovanni Seminara
Publisher: Firenze University Press
Total Pages: 260
Release: 2024-04-05
Genre: Technology & Engineering
ISBN:

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.

Multi-scale Approach of River Morphodynamics

Multi-scale Approach of River Morphodynamics
Author: Filippo Chiodi
Publisher:
Total Pages: 0
Release: 2014
Genre:
ISBN:

This thesis has been devoted to three different problems related to the morphodynamics of rivers. The first of them concerns sediment transport, for which a two-phase flow model has been proposed, valid in both viscous and turbulent regimes. As a main result, this model describes the transition from bed load to suspended load when the Shields number is increased. The second subject was the formation of bars. We revisited the linear stability analysis of these bedforms in order to emphasize the role played by the saturation length. We have shown that this saturation length controls the transition from ripples to bars. The third and most developed aspect of this PhD work was dedicated to the formation of meanders. By means of 3D RANS equations, we have performed a detailed description of hydrodynamics in a channel with both modulated bed and undulating banks. Coupled to sediment transport, the linear stability analysis of the problem gives predictions for the growth rate, the migration velocity and the shape of the bed for given meandering banks of wavenumber k. These predictions are in quantitative agreement with experimental data we obtained in a small flume: the entire dispersion relation is fitted with reasonable parameters of the modeling, but also the bed modulation is correctly reproduced. On the qualitative sicle, we have identified the mechanism responsible for this instability. This mechanism is different to thĂ t proposed by Einstein and it is also different to the resonance proposed by Blondeaux & Seminara. Finally, we have shown that depth-averaged (Saint-Venant) equations are not able to reproduce the instability.

Tools in Fluvial Geomorphology

Tools in Fluvial Geomorphology
Author: G. Mathias Kondolf
Publisher: John Wiley & Sons
Total Pages: 560
Release: 2016-04-28
Genre: Science
ISBN: 1118648560

Fluvial Geomorphology studies the biophysical processes acting in rivers, and the sediment patterns and landforms resulting from them. It is a discipline of synthesis, with roots in geology, geography, and river engineering, and with strong interactions with allied fields such as ecology, engineering and landscape architecture. This book comprehensively reviews tools used in fluvial geomorphology, at a level suitable to guide the selection of research methods for a given question. Presenting an integrated approach to the interdisciplinary nature of the subject, it provides guidance for researchers and professionals on the tools available to answer questions on river restoration and management. Thoroughly updated since the first edition in 2003 by experts in their subfields, the book presents state-of-the-art tools that have revolutionized fluvial geomorphology in recent decades, such as physical and numerical modelling, remote sensing and GIS, new field techniques, advances in dating, tracking and sourcing, statistical approaches as well as more traditional methods such as the systems framework, stratigraphic analysis, form and flow characterisation and historical analysis. This book: Covers five main types of geomorphological questions and their associated tools: historical framework; spatial framework; chemical, physical and biological methods; analysis of processes and forms; and future understanding framework. Provides guidance on advantages and limitations of different tools for different applications, data sources, equipment and supplies needed, and case studies illustrating their application in an integrated perspective. It is an essential resource for researchers and professional geomorphologists, hydrologists, geologists, engineers, planners, and ecologists concerned with river management, conservation and restoration. It is a useful supplementary textbook for upper level undergraduate and graduate courses in Geography, Geology, Environmental Science, Civil and Environmental Engineering, and interdisciplinary courses in river management and restoration.

River Meandering

River Meandering
Author: Charles Morelle Elliott
Publisher:
Total Pages: 1062
Release: 1984
Genre: Science
ISBN:

This collection contains 91 papers on river behavior presented at Rivers '83, held in New Orleans, Louisiana, October 24-26, 1983.

River, Coastal and Estuarine Morphodynamics

River, Coastal and Estuarine Morphodynamics
Author: Gary Parker
Publisher: CRC Press
Total Pages: 1281
Release: 2005-09-29
Genre: Technology & Engineering
ISBN: 1439833893

The proceedings of the 4th Symposium on River, Coastal and Estuarine Morphodynamics offers the latest research results concerning quantitative modelling of the interaction of water and sediment and the shapes this interaction makes in rivers, watersheds, estuaries, the coast, the continental shelf and the deep sea. Morphodynamics is the study of the evolution of landscape and seascape features, from small scale to large.