Selective deposition response to aeolian–fluvial sediment supply in the desert braided channel of the upper Yellow River, China

Wang, H.; Jia, Xiaoxu; Li, Y.; Peng, Weidan

doi:10.5194/nhess-15-1955-2015

Cited by 11 publications

(5 citation statements)

References 21 publications

(32 reference statements)

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“…Although the river transports a large amount of finer material, this fine material is hardly deposited in the main channel (Ta et al, 2003) and thus hardly affects the bar and branch dynamics. The downstream coarsening caused by lateral input of relatively coarse desert sand (Ta et al, 2003;Wang et al, 2015) was neglected. In order to determine the effects of coarser sediment on the channel pattern, we conducted two extra simulations with uniform median grain sizes of 160 and 220 m.…”

Section: Other Model Settingsmentioning

confidence: 99%

Response of braiding channel morphodynamics to peak discharge changes in the Upper Yellow River

Schuurman

Post

et al. 2018

Earth Surf Processes Landf

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The braiding intensity and dynamics in large braiding rivers are well known to depend on peak discharges, but the response in braiding and channel–floodplain transformations to changes in discharge regime are poorly known. This modelling study addresses the morphodynamic effects of increasing annual peak discharges in braiding rivers. The study site is a braiding reach of the Upper Yellow River. We estimated the effects on the larger‐scale channel pattern, and on the smaller‐scale bars, channel branches and floodplains. Furthermore, we determined the sensitivity of the channel pattern to model input parameters. The results showed that the dominant effect of a higher peak discharge is the development of chute channels on the floodplains, formed by connecting head‐cut channels and avulsive channels. Widening of the main channel by bank erosion was found to be less dominant. In addition, sedimentation on the bars and floodplains increased with increasing peak discharge. The model results also showed that the modelled channel pattern is especially sensitive to parametrization of the bed slope effect, whereas the effect of median grain size was found to be relatively small. Copyright © 2018 John Wiley & Sons, Ltd.

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Section: Other Model Settingsmentioning

confidence: 99%

Response of braiding channel morphodynamics to peak discharge changes in the Upper Yellow River

Schuurman

Post

et al. 2018

Earth Surf Processes Landf

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“…The Yellow River flows across Ulan Buh Desert dune fields in the upper reaches, similarly to the lower reaches, with high sediment content, suspended river and flood threats, and has developed a large, unstable, braided-wandering sandy bed. However, it is uniquely characterized by a large lateral addition of aeolian sand that constitutes coarser bedloads distinguishable from fluvial sediment upstream and two grain size fractions separately transporting and depositing [37,38]. Ta, Wang and Jia [32] documented that the decreasing flow discharge and accumulation of lateral coarse sediment supply (>0.08 mm median grain size) from wind-borne sediments coarsened the channel bed surface locally, leading to the channel aggradation rate accelerating rapidly, which were also verified heavy mineral and element indicators [39,40].…”

Section: Introductionmentioning

confidence: 99%

Shrinking Desert Channel Response to Increasing Human Interferences and Changing Natural Factors in the Upper Yellow River

Li,

Jia,

Wang

et al. 2023

Water

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Many rivers are tightly coupled and intersected with aeolian sand dunes, whose geomorphological evolution involves not only fluvial processes but also aeolian processes that pose a new challenge to fluvial geomorphological studies. However, due to few field studies, our overall understanding of the desert channel geomorphic process is limited. In this paper, we present an outstanding example of desert river channel evolution regulated by aeolian–fluvial interactions in the Ulan Buh Desert of the Yellow River, based on a long time series data set (1966–2019) of channel cross-sections. The results indicate that the lateral addition of aeolian sand, the water–sediment relationship and human interference have a significant role at different periods of channel evolution. Before 1986, higher discharge, lower sediment content and greater intensity of aeolian activity caused aeolian–fluvial interactions and a relative scouring and silting balance in the channel, with little human activity. From 1986 to 2000, an increase in large reservoir operation, vegetation coverage and floodplain farming, coupled with water–sediment relationship variation, caused rapid deposition and shrinkage of the river channel. From 2000 to 2014, the channel kept a slight scouring state. With Haibowan reservoir operation beginning in 2014, the talweg experienced rapid scouring and undercut rebound. However, an expanding and stable floodplain accelerated sedimentation on the floodplain and weakened river lateral erosion, indicating that the channel has shown a shrinkage trend. Meanwhile, wavelet analysis results indicate that human interferences and aeolian activities have no significant role in the periodical characteristics of the channel’s longitudinal erosion and deposition. Therefore, on the whole, increasing human interferences and decreasing wind dynamics have driven this desert wandering channel to be stable, and to gradually form a new balance between erosion and sedimentation.

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“…The normal function of the transportation network and water conservation facilities of the adjacent oasis is affected. In the oasis, agriculture, animal husbandry, human health, and environmental security are being threatened (Du et al, 2012;Liu, 2013;Wang et al, 2015). The Ulan Buh Desert Oasis comprises mainly farmland and planted forests that act as shelterbelts.…”

Section: Introductionmentioning

confidence: 99%

Microclimate and Wind Regime of Three Typical Landscapes in the Northeastern Ulan Buh Desert

Luo

Xiao²,

Gao³

et al. 2022

Front. Environ. Sci.

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Knowledge of the microclimate and wind regimes of different land landscapes can be used to support natural resource development and agricultural productivity in desert areas. The aim of this study is to provide a theoretical basis and technical support for the management of Ulan Buh Desert Oasis and the comprehensive prevention and control of sandstorms from the surrounding desert in northern China. We examined the microclimate and wind regime of three landscapes—desert, desert–oasis ecotone, and oasis—and discussed the factors underlying the observed variations. Similar patterns were found in annual temperature, annual relative humidity, and wind speed between the desert, desert–oasis, and the oasis. Compared with the desert and the desert–oasis ecotone, the average annual temperature and wind speed in the oasis were lower by 2.56%–5.38% and 32.99%–37.05%, respectively. Average annual relative humidity in the oasis was higher than in other areas by 1.31%–2.57%. The desert, desert–oasis ecotone, and the oasis were dominated by westerly winds. Wind direction was relatively stable in the oasis and variable in the desert and desert–oasis ecotone. There were intermediate wind energy fields in the desert and the desert–oasis ecotone and a low wind energy field in the oasis. In the desert–oasis ecotone, drift potential (DP), resultant drift potential (RDP), and resultant drift direction (RDD) were 231.87 VU, 97.21 VU, and 104.33°, respectively. In the desert, DP was 228.45 VU, RDP was 92.65 VU, and RDD was 76.05°. In the oasis, the DP was 61.85 VU, RDP was 38.04 VU, and RDD was 92.97°. In the desert and the desert–oasis ecotone, sediment transport potential was the highest in spring, second highest in autumn, third highest in winter, and lowest in summer. In the oasis, it was the highest in winter, second highest in autumn, third highest in spring, and lowest in summer. There are complex variations in the dominant sediment transport directions in the desert and desert–oasis ecotone in the study area. Variations in the dominant sediment transport direction in the oasis are less complicated and are associated with the seasons. The oasis is primarily threatened by sandstorms from the south-southeast in spring.

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Selective deposition response to aeolian–fluvial sediment supply in the desert braided channel of the upper Yellow River, China

Cited by 11 publications

References 21 publications

Response of braiding channel morphodynamics to peak discharge changes in the Upper Yellow River

Response of braiding channel morphodynamics to peak discharge changes in the Upper Yellow River

Shrinking Desert Channel Response to Increasing Human Interferences and Changing Natural Factors in the Upper Yellow River

Microclimate and Wind Regime of Three Typical Landscapes in the Northeastern Ulan Buh Desert

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