Spatial distribution and response of dunes to anthropogenic factors in the lower Yangtze River

Zheng, Shuwei; Hu, Hao; Xu, Shiguo; Cheng, Heqin; Liu, Enfeng

doi:10.1016/j.catena.2022.106045

Cited by 7 publications

(9 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Besides, sand mining and dredging in the navigation channel will deepen the river channel and lead to riverbed material losses (Zheng, Cheng, et al, 2022; Zheng, Hu, et al, 2022). For example, Brunier, Anthony, Goichot, Provansal, and Dussouillez (2014) found that sand mining has deepened mean depth of 1.3 m in the Mekong River from 1998 to 2008.…”

Section: Discussionmentioning

confidence: 99%

“…Besides, sand mining and dredging in the navigation channel will deepen the river channel and lead to riverbed material losses Zheng, Hu, et al, 2022).…”

Section: Influence Of Human Projects On River Channel Deformationmentioning

confidence: 99%

“…River channels cope with external disturbances by self‐adjusting their geomorphic morphology (Luan, Ding, Wang, Ge, & Yang, 2016; Zheng, Cheng, et al, 2022; Zheng, Hu, et al, 2022). This process is primarily achieved through the transport and accumulation of river sediments and is manifested in the macro‐geomorphology of the channel scour, dynamic equilibrium, and siltation (Zheng et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Morphological response of the upper Yangtze Estuary to changes in natural and anthropogenic factors

Zhang

Wang

Dong

et al. 2022

River Research & Apps

Self Cite

View full text Add to dashboard Cite

Globally, over the past few decades, extreme river channel deformation has been observed downstream of dams. Specially, estuarine channel deformation and its response to natural and anthropogenic factors are key issues influencing channel regulation and prediction of long‐term stability in large estuarine deltas. Herein, bathymetry data for the upper reaches of the Yangtze Estuary (YE), China was collected for the years 1995, 2003, 2008, 2013, and 2019 to analyze the channel deformation process. Our findings show that the total erosion volume was approximately 11.22 × 108 m3, an equivalent of 15.7 × 108 t of sediment assuming a bulk density of 1.4 t/m3 for the riverbed material during 1995–2019. Meanwhile, the annual erosion rate is 0.63 Mt/year in 1995–2019, and the annual erosion rate is 0.90, 0.12, 0.40 Mt/year in 1995–2003, 2008–2013 and 2013–2019, respectively. Meanwhile, the annual deposition rate is 0.7 Mt/year during 2003–2008. Further analysis indicated that continuous reduction of the sediment load due to the construction of dams (e.g., the Three Gorges Dam) in the basin was a key factor influencing channel erosion over the past 24 years. The channel deformation process was characterized by severe erosion during 1995–2003, a deposition period during 2003–2008, a dynamic equilibrium period from 2008–2013, and an erosion period after 2013. Due to floods with maximum peak discharge lower than 70,000 m3/s, despite the annual sediment load is reduced, the channel deposition phenomenon occurred in 2003–2008. The channel changed from a depositional system to an erosion system during 2008–2013. After 2013, the channel was dominated by extensive erosion, severe local deposition, or severe local erosion as a response to anthropogenic interventions. These findings are of great significance to river management and regulation, as well as to the navigational safety.

show abstract

Section: Discussionmentioning

confidence: 99%

“…Besides, sand mining and dredging in the navigation channel will deepen the river channel and lead to riverbed material losses Zheng, Hu, et al, 2022).…”

Section: Influence Of Human Projects On River Channel Deformationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Morphological response of the upper Yangtze Estuary to changes in natural and anthropogenic factors

Zhang

Wang

Dong

et al. 2022

River Research & Apps

Self Cite

View full text Add to dashboard Cite

show abstract

“…Maximum and minimum daily discharges are 92,000 m 3 /s and 4600 m 3 /s, respectively, according to observation data [23]. Between 1950 and 2000, the annual flow discharge and sediment load were 9.05 × 10 11 m 3 and 4.30 × 10 8 t, respectively [18].…”

Section: Study Areamentioning

confidence: 99%

“…Cheng et al (2002) obtained high-resolution images of dune movement and reported that the dune scale is larger during the ebb tide period than the flood tide period [16]. The maximum dune length was ~300 m prior to the operation of the Three Gorges Dam (TGD) [17] and the dune length has increased to 441 m after the running of the TGD in the lower reach of the YR [18]. Wang et al (2011) found that dune characteristics are related to several factors, including the channel geomorphological properties, such as its surrounding sand ridge, as well as the hydrodynamic environment of the flood and ebb channels [19].…”

Section: Introductionmentioning

confidence: 99%

Seasonal Variation of Catenary-Bead Dunes in the Yangtze River Estuary: Causes and Implications

Zheng

Yuan

Yang

et al. 2022

JMSE

Self Cite

View full text Add to dashboard Cite

Low-angle lee-side slopes of dunes are commonly developed on the world’s riverbeds, and dune migration associated with sediment transport exert a major influence on riverine processes. However, the catenary-bead dune has been identified in the Yangtze River (YR) Estuary, featuring a higher lee-side angle. To date, the morphological variation and formation reasons of catenary-bead dunes in the YR Estuary remain uncharacterized. In this study, we used a multibeam echo system (MBES) to investigate the bedforms of the YR estuary during 2014–2015, as well as to discuss the seasonal variation of catenary-bead dunes. The results indicate that the catenary-bead dunes of the YR Estuary are characterized by growth during the flood season and extinction during the dry season. The lee-side angle is typically ~16.7°, which is larger than that of other dune types (3.7–8°) in the estuary; moreover, the catenary-bead dunes are higher than other dune types of the same length in the YR Estuary. The relationship between the dune height (H) and length (L) was found to be H = 0.1667L0.603 (R2 = 0.38), while the other dune types yielded the relationship of H = 0.0845L0.758 (R2 = 0.52). Strong runoff superimposing the ebb tide led to the development of catenary-bead dunes. Furthermore, the higher coarse sediment content (69.9–72%) and lower clay content (6.3–6.7%) of the riverbed sediment are favorable for their formation, while the higher curved crest-lines are favorable for the formation of the associated elliptical pits.

show abstract

Difference in riverbed micromorphology of two world large lowland rivers: Implication of natural and human effects

Cheng

et al. 2022

Estuarine, Coastal and Shelf Science

View full text Add to dashboard Cite

Spatial distribution and response of dunes to anthropogenic factors in the lower Yangtze River

Cited by 7 publications

References 39 publications

Morphological response of the upper Yangtze Estuary to changes in natural and anthropogenic factors

Morphological response of the upper Yangtze Estuary to changes in natural and anthropogenic factors

Seasonal Variation of Catenary-Bead Dunes in the Yangtze River Estuary: Causes and Implications

Difference in riverbed micromorphology of two world large lowland rivers: Implication of natural and human effects

Contact Info

Product

Resources

About