Talweg lateral shift characteristics in the Ulan Buh Desert Reach of the Yellow River from 1966 to 2019

doi:10.7522/j.issn.1000-694X.2023.00036

Journal of Desert Research ›› 2023, Vol. 43 ›› Issue (5): 59-65.DOI: 10.7522/j.issn.1000-694X.2023.00036

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Talweg lateral shift characteristics in the Ulan Buh Desert Reach of the Yellow River from 1966 to 2019

Yongshan Li¹(), Xiaopeng Jia²(), Haibing Wang³, Jian Wang¹, Qimin Ma⁴

^1.North Jiangsu Institute of Agricultural and Rural Modernization，Yancheng Teachers University，Yancheng 224007，Jiangsu，China
^2.Key Laboratory of Desert and Desertification，Northwest Institute of Eco-Environment and Resources，Chinese Academy of Sciences，Lanzhou 730000，China
^3.College of Desert Control Science and Engineering，Inner Mongolia Agricultural University，Hohhot 010011，China
^4.College of Resources and Environment，Chengdu University of Information Technology，Chengdu 610225，China

Received:2023-03-01 Revised:2023-04-07 Online:2023-09-20 Published:2023-09-27
Contact: Xiaopeng Jia

Abstract

Abstract:

Affected by the lateral infusion of aeolian sand into the Yellow River， geomorphological processes along the desert reach of the Yellow River are complex， of which channel lateral shift response of the river is sensitive. Based on the river channel cross-section data set of the Ulan Buh Desert reach of the Yellow River from 1966 to 2019， the talweg lateral shift parameters were extracted， and the characteristics and mechanism of the talweg lateral shift of desert rivers were analyzed， in the hope of providing references for the management of desert rivers. The results show that the lateral shift intensity of the riverbed talweg is significantly positively correlated with annual runoff and its unevenness coefficient， riverbed load grainsize and riverbank aeolian dynamic conditions. Talweg lateral shift speed decreased at an annual rate of 8.24 m from 1966 to 2019， and the fluctuation amplitude decreased significantly. Meanwhile， there are two types of periodic variation at 19 a and 7 a characteristic time scale in the process of talweg lateral shift， whose periodic variation are 13 a and 5 a， respectively， with continuously weakening periodicity. The trends of talweg lateral shift speed and periodic variation indicate that the lateral erosion and deposition of desert braided river channel tends to be stable.

Key words: Ulan Buh Desert, desert river, lateral shift

CLC Number:

P343

Yongshan Li, Xiaopeng Jia, Haibing Wang, Jian Wang, Qimin Ma. Talweg lateral shift characteristics in the Ulan Buh Desert Reach of the Yellow River from 1966 to 2019[J]. Journal of Desert Research, 2023, 43(5): 59-65.

Figures/Tables 8

Fig.1 Study area location and channel cross section distribution（RS image： Landsat LE71290322000083SGS00）

Fig.2 Changes of talweg lateral shift speed （A） and its cumulative departure curve （B） from 1966 to 2019

Fig.3 Changes of channel cross-section numbers （A） of talweg lateral shift toward to left bank and right bank， respectively， and talweg shift distance （B） in flood season and non-flood season

Fig.4 Wavelet coefficient real part contour plot and wavelet variance plot

Fig.5 Wavelet real part process lines at 19 a and 7 a characteristic time scales

Fig.6 Relationship between talweg lateral shift and runoff （A）， unevenness coefficient （B）， suspended sediment concentration （C） and elevation difference between floodplain and talweg （D）

Fig.7 Relationship between talweg lateral shift speed and bedload grainsize （A） and days of wind speed more than 6 m·s-1 （B）

Fig.8 Examples of reduced talweg shift distance in response to increased cross section area

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Talweg lateral shift characteristics in the Ulan Buh Desert Reach of the Yellow River from 1966 to 2019

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