Lateral erosion/accretion area and shrinkage rate of the Linhe reach braided channel of the Yellow River between 1977 and 2014

Yanguo, Mei

doi:10.1007/s11442-016-1345-5

Cited by 17 publications

(7 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The high density of Δf values within the range of 90 to 120°in mid-channel and bank-attached bars demonstrates that dune migration transverse to the dip azimuth of bar-slope surfaces is a fundamental process of accretion for both types of bars. This corroborates previous observations that lateral accretion occurs also in multi-thread channels (Bristow, 1987(Bristow, , 1993Best et al, 2003;Wang & Mei, 2016), where it may contribute up to 60% of bar accretion (Bristow, 1987(Bristow, , 1993. That being said, the higher frequency of Δf values slightly higher than 90°(ca 120°to 130°) indicates that dune migration along bar flanks is oblique.…”

Section: Significance Of Flow Variance In Riverssupporting

confidence: 91%

Distinguishing mid‐channel and bank‐attached fluvial bars by flow divergence: Implications for the interpretation of stratigraphic records

et al. 2021

View full text Add to dashboard Cite

The characterization of ancient fluvial-channel bars informs predictions of sedimentary facies distribution, and hence they are critical for interpreting river morphodynamics through time. Within active fluvial channels, sediment storage occurs along the banks or along their axial portion, generating bank-attached or mid-channel bars, respectively. This study introduces the angle of flow divergence (Δf), measured as the angle between the azimuths of bar accretionary slopes and local dune migration, and quantitatively explores its distribution in 103 channel reaches that have a sandy bed load and clear water. This dataset includes both mid-channel and bank-attached bars from low-variable peak discharge rivers of Russia and Brazil. Remotely sensed evidence shows that dune migration transverse to the dip azimuth of bar slopes (Δf ≅ 90-110°) occurs both in mid-channel and bank-attached bars, contradicting the long-standing tenet that palaeoflows nearly orthogonal to the dip azimuth of large-scale inclined strata are indicative of sinuous, single-thread palaeochannels. Only Δf values significantly higher (>140°) or lower (<60°) than 90°discriminate mid-channel and bank-attached fluvial bars. Comparisons between Δf values and bar-accretionary styles suggest that mid-channel bars formed by high-peak and low-peak variable discharge rivers tend to preserve axially and laterally accreting deposits, respectively. Nearly orthogonal divergence angles are found in bank-attached bars irrespective of peak-discharge variability. While stressing that analyses akin to the one presented here are to be complemented with additional sedimentological information from high-quality outcrops, this study proposes a new, quantitative, approach to better distinguish fluvial bars, and hence possibly the planform pattern of associated channel bodies, from sedimentary successions. In particular, the data show that a reliable distinction between mid-channel and bank-attached bars should be based on comprehensive palaeocurrent and architectural information from various portions of preserved bar bodies, and that inferences based on limited datasets should be considered with caution.

show abstract

Section: Significance Of Flow Variance In Riverssupporting

confidence: 91%

Distinguishing mid‐channel and bank‐attached fluvial bars by flow divergence: Implications for the interpretation of stratigraphic records

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Comparison of channel migration with other braided rivers Similar studies on channel migration or channel bank erosion/accretion of braided rivers have been reported worldwide (e.g., Thorne et al 1993;Khan and Islam 2003;Richard et al 2005;Baki and Gan 2012;Wang et al 2012;Wang and Mei 2016). The channel migration rates show a wide range of variability among diverse braided rivers.…”

Section: Discussionsupporting

confidence: 60%

Spatial and temporal variations of channel lateral migration rates in the Inner Mongolian reach of the upper Yellow River

Ran

Yan

2016

Environ Earth Sci

Self Cite

View full text Add to dashboard Cite

Channel variations of the Inner Mongolian reach in the upper Yellow River are very complicated because of diversity of channel patterns, intense changes in water and sediment, and enhanced human activities in the last decades. It is important to examine the channel migration rates in this river reach. Based on channel planform changes at 236 digital channel cross-sections, the present study estimated the channel migration rates in terms of mid-channel line shift at the digital channel cross-sections during the periods 1975-1990, 1990-2000, 2000-2006, 2006-2010, and 2010-2011. The results show that the average channel migration rate for the whole river reach is 5.0, 7.9, -5.9, 8.6, and -1.0 m -1 in the five different periods, respectively. In both directions to the right and to the left, the highest channel migration rate was always observed in the meandering channels, while the lowest channel migration rate was in the whole Inner Mongolian reach except the Sanhuhekou-Zhaojunfen (S-Z) sub-reach. The temporal variation of channel migration rate was mainly controlled by changing sediment concentration in river flow, while the spatial variation along the straight, braided, and meandering channel reaches was largely affected by material differences of channel banks as reflected by different channel patterns. With the highest average lateral migration rate to the left bank, the meandering channel reach is extremely vulnerable to lateral migration and needs to be protected with engineering practices, because a large population and wide farmland are located on its left floodplain.

show abstract

“…Satellite image analysis is an important and powerful tool used to obtain channel planforms that has been widely applied in fluvial geomorphological research (e.g., Wang et al, 2014;Mei and Wang, 2016). The Landsat images of the study area used in this research comprise 30 m resolution TM data (captured on July 8th, 1990), 15 m resolution ETM data (captured on August 15th, 2001), and 15 m resolution OLI data (captured on July 23rd, 2013, and July 15th, 2016).…”

Section: Methodsmentioning

confidence: 99%

“…All of these satellite images were downloaded from the United States Geological Survey (http://glovis.usgs.gov/) and were used in combination with two GE images (captured on August 27th, 2011, and July 29th, 2013) that have 0.5 m resolution. All images were collected during the flooding season between June and September in order to facilitate the use of vegetation boundaries to delineate channels and to accurately extract their spatial distributions (Wang et al, 2014;Gurnell, 2015;Mei and Wang, 2016).…”

Section: Methodsmentioning

confidence: 99%

Evolution of the gravel-bedded anastomosing river within the Qihama reach of the First Great Bend of the Yellow River

Gao

2019

J. Geogr. Sci.

Self Cite

View full text Add to dashboard Cite

The anastomosing river that is present within the First Great Bend of the Yellow River is different from other sand-bedded rivers of this type because it contains gravel-bedded materials. It is therefore important to determine whether, or not, the specific characteristics of this anastomosing river are similar to those seen in sand-bedded forms, including the characteristics of erosion and deposition, and the stability of channel and interchannel wetlands. Four Landsat images from 1990, 2001, 2013, and 2016 alongside two Google Earth (GE) images from 2011 and 2013 were utilized in this study in tandem with field sampling and observations to select a 12 km main channel length section of the Qihama reach anastomosing river. This section was then used to determine variations in channel planform and sedimentary characteristics over a 26 year period. The results of this study show that this gravel-bedded anastomosing river has exhibited a high degree of stability overall, and that there has been no obvious channel and wetland bank erosion and deposition. Data also show that over the 26 years of this study, anastomosing belt area increased by 2.43%, while the ratio of land to water area remained almost equal. The number of wetlands has also increased along this river section at a rate as high as 62.16% because of the fragmentation of some small interchannel examples, while the talweg has alternately migrated to either the left or right over long periods of time at a relatively stable rate. Indeed, as a result of the migration of this line, there has been significant turnover in the number of islands within the main channel while bank shift has occurred at a rate of about 5 m/yr. The numerous anastomosing channels within this river section remained very stable over the course of this study, characterized by a mean annual migration rate of just 1 m/yr, while the sediments in bank columnar sections are mainly composed of fine sands or silts with a relatively high clay content. The sediment grain-size distribution curve for this river section contains multiple peaks, distinct from the muddy sediments within bank columnar sections from sand-bedded anastomosing rivers. The dense vegetation within riparian and interchannel wetlands alongside this river reach has also protected anastomosing channels from erosion and maintained GAO Chao et al.: Evolution of the gravel-bedded anastomosing river within the Qihama reach of the Yellow River 307 their stability, a key feature of this gravel-bedded system.

show abstract

Lateral erosion/accretion area and shrinkage rate of the Linhe reach braided channel of the Yellow River between 1977 and 2014

Cited by 17 publications

References 13 publications

Distinguishing mid‐channel and bank‐attached fluvial bars by flow divergence: Implications for the interpretation of stratigraphic records

Distinguishing mid‐channel and bank‐attached fluvial bars by flow divergence: Implications for the interpretation of stratigraphic records

Spatial and temporal variations of channel lateral migration rates in the Inner Mongolian reach of the upper Yellow River

Evolution of the gravel-bedded anastomosing river within the Qihama reach of the First Great Bend of the Yellow River

Contact Info

Product

Resources

About