Journal ArticleDOI
Characterization and prediction of meandering channel migration in the GIS environment: A case study of the Sabine River in the USA
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TLDR
This study proves the effectiveness of least squares estimation with historical orthophotography for characterization of meandering channel migration of the Sabine River between the states of Texas and Louisiana.Abstract:
This study focused on the prediction of a 22 km meandering channel migration of the Sabine River between the states of Texas and Louisiana. The meander characteristics of 12 bends, identified from seven orthophotos taken between 1974 and 2004, were acquired in a GIS environment. Based on that earlier years’ data acquisition, channel prediction was performed for the two years 1996 and 2004 using least squares estimation and linear extrapolations, yielding a satisfactory agreement with the observations (the median predicted and observed migration rates were 3.1 and 3.6 [m/year], respectively). The best-predicted migration rate was found to be associated with the longest orthophoto-recorded interval. The study confirmed that channel migration is strongly correlated with bend curvature and that the maximum migration rate of the bend corresponded to a radius of curvature [bend radius (RC)/channel width (WC)] of 2.5. In tight bends of a smaller radius of curvature than 1.6, secondary flow scouring near the bend apex increases bend curvature. The stability index of the dimensionless bend radius was determined to be 2.45. Overall, this study proves the effectiveness of least squares estimation with historical orthophotography for characterization of meandering channel migration.read more
Citations
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Journal ArticleDOI
Changes in morphometric meander parameters identified on the Karoon River, Iran, using remote sensing data
TL;DR: In this paper, the authors identify morphological changes of the Karoon River in Iran using high accuracy maps and Landsat satellite images by analyses during the time period 1989-2008.
Journal ArticleDOI
Field migration rates of tidal meanders recapitulate fluvial morphodynamics.
Alvise Finotello,Stefano Lanzoni,Massimiliano Ghinassi,Marco Marani,Marco Marani,Andrea Rinaldo,Andrea D'Alpaos +6 more
TL;DR: The results challenge the conventional view of tidal channels as stable landscape features and suggest that meandering tidal channels recapitulate many fluvial counterparts owing to large gradients of tidal prisms across meander wavelengths.
Journal ArticleDOI
An assessment on the nature of channel migration of River Diana of the sub-Himalayan West Bengal using field and GIS techniques
TL;DR: In this article, a detailed study of channel dynamics of the Diana River has been conducted for an 85-year spanning period to unveil the nature of channel migration in terms of changes in historical bankline and centerline positions and alterations in meander geometries through numeric and graphical methods coupled with field observations.
Journal ArticleDOI
Effects of urbanization on river morphology of the Talar River, Mazandarn Province, Iran
Saleh Yousefi,Hamid Reza Moradi,Saskia Keesstra,Hamid Reza Pourghasemi,Oldrich Navratil,Janet Hooke +5 more
TL;DR: In this paper, the authors investigated the effects of urbanization growth on river morphology in the downstream part of Talar River, east of Mazandaran Province, Iran and found that residential lands were increased in area by about 1631%, while forest land and riparian vegetation decreased in by approximately 99.9 and 96.2%, respectively.
Journal ArticleDOI
Hydrological connectivity of abandoned channel water bodies on a coastal plain river
TL;DR: In this article, the authors examined the hydrological connectivity between active river channels and floodplain depressions in a single fluvial system and identified six different types of surface water connectivity with the main, active channel: (i) flow through, a portion of the river flow regularly passes through the feature and returns to the main channel, (ii) flood channel, there is no hydraulic connection at normal flows, but at high flows the channels convey discharge, at least part of which returns to main channel; (iii) fill and spill, the features fill to a threshold
References
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Journal ArticleDOI
Lateral Migration Rates of River Bends
TL;DR: In this article, the lateral migration rates of sediment entrainment in 21 clay, sand and gravel rivers in western Canada were measured using time sequential aerial photographs flown approximately 20 to 30 years apart, and they were transformed to a reference bend curvature (r/w = 2.5).
Book
Applied fluvial geomorphology for river engineering and management.
TL;DR: The application of applied fluvial geomorphology to river management can be found in this article, where Newson et al. presented a case study of the application of Geomorphology in river management.
Journal ArticleDOI
Secondary Flow in Sharp Open-channel Bends
TL;DR: The occurrence of the outer-bank cell is shown to be not just due to flow instability, but also to kinetic energy input from turbulence, which shows that turbulence plays a minor role in the generation of the centre-region cell, which is mainly due to the centrifugal force.
Journal ArticleDOI
Channel Migration and Incision on the Beatton River
TL;DR: In this paper, the authors examined the relationship between bend radius of curvature to channel width ratios (r\dm/w) for the Beatton River and showed that bend migration is a discontinuous process within any single bend and that predictions of migration rates for individual bends, based on short-term measurements using erosion pins or aerial photographs, are highly suspect.
Journal ArticleDOI
Changing river channels
TL;DR: Gardiner et al. as discussed by the authors presented a survey of changes of river channels in Europe during the Holocene (L. Starkel, V. Park, G. Petts, and G. Gardiner).
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