Supplied Sediment Tracking for Bridge Collapse with Large-Scale Channel Migration

Inoue, Takuya; Mishra, Jagriti; Kato, Kazúo; Sumner, Tamaki; Shimizu, Yasuyuki

doi:10.3390/w12071881

Cited by 20 publications

(10 citation statements)

References 47 publications

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“…Further, various other studies have used numerical models to understand the meandering processes and their role in the sediment supply. In this regard, Inoue et al, 2020 [ 58 ] developed used a numerical model to reproduce the flooding events of 2010 and 2016 that destroyed the Kyusen Bridge over the Bebetsu River, Hokkaido, Japan. This study further suggested a strong relationship between erosional bank rates, flow discharge, and sediment supply, as was observed in our study as well.…”

Section: Resultsmentioning

confidence: 99%

Integrated remote sensing and field-based approach to assess the temporal evolution and future projection of meanders: A case study on River Manu in North-Eastern India

et al. 2022

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A common phenomenon associated with alluvial rivers is their meander evolution, eventually forming cutoffs. Point bar deposits and ox-bow lakes are the products of lateral bend migration and meander cutoff. The present study focuses on identifying the meanders of River Manu and their cutoffs. Moreover, this study compares the temporal evolution and predicts the progress of selected meanders of River Manu. In the present research, the Survey of India topographical map, satellite imagery, and geographic information system (GIS) technique were used to examine the evolution of the Manu River meander. Subsequently, a field visit was done to the selected cutoffs and meanders of River Manu to ascertain the present status and collect data. It has been observed that many cutoffs have undergone temporal changes, and their sizes have decreased. Some have become dried or converted to agricultural fields. The width of River Manu has decreased in all the selected bends from 1932 to 2017. The sinuosity index has changed from 2.04 (1932) to 1.90 (2017), and the length of the river has decreased by 7 km in 85 years (1932–2017). The decrease in length is evident from lowering the number of meanders. Uniformity coefficient and coefficient of curvature of the bank soil samples were calculated, indicating that the soil is poorly graded and falls under the cohesionless category. Based on cross-section analysis, sediment discharge, grain-size analysis of the bank material, channel planform change, and radius of curvature, it can be stated that almost all the selected bends have the probability of future cutoff. The highest probabilities were observed in bend 3 (Jalai) and bend 4 (Chhontail). This work is aimed to provide planners with decisions regarding the construction of roads and bridges in areas that show the huge dynamicity of river meandering.

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Section: Resultsmentioning

confidence: 99%

Integrated remote sensing and field-based approach to assess the temporal evolution and future projection of meanders: A case study on River Manu in North-Eastern India

et al. 2022

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“…96 % der beschädigten Brücken befanden sich zwischen den unteren Teilen der Bergtäler und den oberen Teilen der Schwemmfächer. Flussbette in diesen Bereichen neigen aufgrund der aus den Bergregionen antransportierten großen Mengen von Sedimenten dazu, erheblich anzusteigen [46]. Oft erfahren Leitmedien aber gar nicht von diesen Einstürzen im ländlichen Raum.…”

Section: Auswirkungen Von Brückeneinstürzen Und Berichterstattungunclassified

Trend der Brückeneinstürze bei zunehmender Berichterstattung

Proske

2023

Beton und Stahlbetonbau

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In den letzten Wochen und Monaten erfolgten in den Tagesmedien vermehrt Berichterstattungen über Brückeneinstürze. Diese betrafen sowohl Einstürze von Brücken im Bau als auch Einstürze durch außergewöhnliche Einwirkungen wie Hochwasser, Blitzfluten, Anpralle oder Brände oder unter Verkehrsbelastung. Diese gehäufte Berichterstattung legt die Frage nahe, ob sich die Einsturzhäufigkeit von Brücken in diesem und im letzten Jahr erhöht hat. In diesem Beitrag wird der Versuch unternommen, diese Frage zu beantworten. Dazu werden sowohl bisherige Studien als auch aktuelle Prognosen zusammengefasst. Darüber hinaus erfolgt ein Vergleich der Daten der IABSE‐Einsturzdatenbank mit einer eigenen Datensammlung. Im Ergebnis kann man nicht bestätigen, dass die Einsturzhäufigkeit von Brücken gestiegen ist, vermutlich ist aber der seit Jahrzehnten zu beobachtende fallende Trend der Einsturzhäufigkeiten zum Stillstand gekommen.

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“…Kang et al [17] also applied this model to reproduce the experiments of Bertoldi et al [16], and demonstrated its general applicability in reproducing the braided channel. This type of morphodynamic model has been widely used to reproduce not just the braided channel but different types of large-scale morphodynamic phenomena, i.e., alternate bars [23,24], multiple bars [22], and meandering [25,26], and its use has been validated as well. These applications suggested that the model can also be applied to model several bar patterns (alternate and multiple bars) in this study.…”

Section: Flow Sediment Transort and Morphodynamics: Eulerian Approachmentioning

confidence: 99%

The Role of Large-Scale Bedforms in Driftwood Storage Mechanism in Rivers

Okitsu

Iwasaki

Kyuka

et al. 2021

Water

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The quantification of driftwood deposition in rivers is important for understanding the total budget of driftwood at the watershed scale; however, it remains unclear how such driftwood storage in rivers contributes to the overall system because of the difficulties in undertaking field measurements. Herein, we perform numerical simulations of driftwood deposition within an idealized river reach with a sand-bed, to describe the role of large-scale bedforms, more specifically, alternate bars, multiple bars, and braiding, in driftwood storage in rivers. The numerical model we propose here is a coupling model involving a Lagrangian-type driftwood model and an Eulerian two-dimensional morphodynamic model for simulating large-scale bedforms (i.e., bars and braiding). The results show that the channel with a braiding pattern provides a wide area with enhanced capacity for deposition of driftwood, characterized by exposed mid-channel or in-channel bars, leading to high driftwood storage. The alternate bar is also a large bedform representing a sediment depositional element in rivers; however, because of the narrow exposed bar area and its downstream-migrating feature during floods, the alternate bars seem to contribute less to driftwood deposition in rivers. This suggests that the role of multiple bars and braiding is critically important for the driftwood deposition in rivers.

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Supplied Sediment Tracking for Bridge Collapse with Large-Scale Channel Migration

Cited by 20 publications

References 47 publications

Integrated remote sensing and field-based approach to assess the temporal evolution and future projection of meanders: A case study on River Manu in North-Eastern India

Integrated remote sensing and field-based approach to assess the temporal evolution and future projection of meanders: A case study on River Manu in North-Eastern India

Trend der Brückeneinstürze bei zunehmender Berichterstattung

The Role of Large-Scale Bedforms in Driftwood Storage Mechanism in Rivers

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