scholarly journals Quantitative Ascription of Sediment Discharge Changes of Two Highly Sediment-Loaded Tributaries of the Yellow River in China: The Importance of Selecting Rainfall Index and Timescale

Water ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 845
Author(s):  
Xiaoqing Ma ◽  
Changxing Shi ◽  
Jia Peng ◽  
Wei Liu
Keyword(s):  
Sediment Load ◽  
Yellow River ◽  
Yield Reduction ◽  
The Yellow River ◽  
Rainfall Erosivity ◽  
Sediment Discharge ◽  
Characteristic Index ◽  
Rainfall Index ◽  
Pettitt Test ◽  
Cumulative Curve

River sediment load has been changing conspicuously worldwide. The famous sediment-laden Yellow River in China has also had a declining sediment load in the past decades. This study made a quantitative ascription of the sediment discharge changes by non-parametric Pettitt test, rainfall and sediment discharge characteristic index calculation, correlation test, double cumulative curve regression and solving differential equation in the Huangfu and the Kuye basins in the main sediment sources of the Yellow River. The results indicated that: (1) The sediment discharge decreased significantly from 1956 to 2016, while the rainfall and rainfall erosivity only had a visible but insignificant decreasing trend. (2) Rainfall erosivity is better than other rainfall characteristic indexes in relation with sediment discharge. (3) The anthropogenic factor was the main driver for the reduction of sediment discharge with a percentage of 70.2–90.5% in different periods. The contribution of rainfall changes in flood season to sediment discharge reduction surpassed that in the whole year. (4) A percentage of 88% and 93% of suspended sediment yield reduction was attributed to streamflow reduction, and 12% and 7% to changes in C-Q relationship in the Huangfu and the Kuye basins, respectively.

scholarly journals Identifying the degree of luminescence signal bleaching in fluvial sediments from the Inner Mongolian reaches of the Yellow River

2018 ◽  
Vol 45 (1) ◽  
pp. 82-96 ◽  
Author(s):  
Fuqiang Li ◽  
Baotian Pan ◽  
Zhongping Lai ◽  
Hongshan Gao ◽  
Xianjiao Ou
Keyword(s):  
Sediment Load ◽  
Yellow River ◽  
Coarse Grained ◽  
The Yellow River ◽  
Fluvial Sediments ◽  
Luminescence Signal ◽  
Particle Size Fractions ◽  
Signal Characteristics ◽  
High Sediment ◽  
Partial Bleaching

Abstract The partial bleaching of the luminescence signal prior to deposition results in age overestimation, and can be a problem in delineating fluvial evolution within an OSL chronological framework. The Inner Mongolian reaches of the Yellow River are characterised by a high sediment load and complex sources of sediments. To test the incomplete bleaching occurring in this type of environment, the residual doses and the luminescence signal characteristics of different particle size fractions from 14 modern fluvial sediment samples were investigated. Furthermore, 26 OSL ages derived from drilling cores were compared with 11 radiocarbon ages. Our results show that the residual equivalent doses principally range between 0.16 and 0.49 Gy for silt grains, and between 0.35 and 3.72 Gy for sand grains of modern samples. This suggests that medium-grained quartz has been well bleached prior to deposition, and is preferable to coarse-grained quartz when dating fluvial sediments in this region. The results also show that the De values of coarse-grained fractions display a stronger correlation with distance downstream. In addition, a comparison of OSL and radiocarbon ages from drilling cores establishes further confidence that any initial bleaching of these sediments was sufficient. As a result, we believe that the studied fluvial samples were well bleached prior to deposition.

scholarly journals Sediment Variation Characteristics of Major Rivers in the Middle Reaches of the Yellow River

2021 ◽  
Vol 5 (5) ◽  
pp. 20-26
Author(s):  
Yaxi Cai ◽  
Xiaodong Yang
Keyword(s):  
Sequence Analysis ◽  
Sediment Transport ◽  
River Basin ◽  
Yellow River ◽  
The Yellow River ◽  
Sediment Discharge ◽  
Variation Characteristics ◽  
Major River ◽  
Kendall Method ◽  
Hydrological Station

The sediment sequence analysis of Mann-Kendall method based on major rivers of 10 hydrological station in the middle reaches of the Yellow River [1]. The results show that: The main rivers in the middle reaches of the Yellow River hydrologic station sediment overall showed a trend of decreased significantly. Sediment discharge of all stations except Gao Jiachuan station have reached the maximum in 1956-1969s [2-3]. Among various hydrologic station sediment discharge of inter-generational are generally shows the tendency of reducing year by year. Calculate the sediment transport of major river basin of Yellow River, which average is 0.63.

Trend and change-point analyses of streamflow and sediment discharge in the Yellow River during 1950–2005

2010 ◽  
Vol 55 (2) ◽  
pp. 275-285 ◽  
Author(s):  
Peng Gao ◽  
Xunchang Zhang ◽  
Xinming Mu ◽  
Fei Wang ◽  
Rui Li ◽  
...  
Keyword(s):  
Change Point ◽  
Yellow River ◽  
The Yellow River ◽  
Sediment Discharge

Sedimentation at different time scales in Yellow River delta in response to course shift and water-sediment regulation

2020 ◽  
Author(s):  
Qiao Shuqing ◽  
Shi Xuefa ◽  
Yonggui Yu ◽  
Limin Hu ◽  
Lin Zhou ◽  
...  
Keyword(s):  
Sediment Load ◽  
Yellow River ◽  
Yellow River Delta ◽  
River Channel ◽  
River Delta ◽  
The Yellow River ◽  
Hydrodynamic Conditions ◽  
Delta Area ◽  
Fluvial Sediment ◽  
High Sediment

<p>The fluvial sediment to the sea is the base of coastal geomorphology and biogeochemical processes, and its transport is an important pathway to the global biogeochemical cycle. The Yellow River is one of globally well-known large rivers because of high sediment load and Chinese Mother River. Its channel shifts frequently because of high sediment load and steep river-channel gradient in the lower reaches . The terminal channel has shifted more than 50 times since 1855 and the last two changes in 1976 and 1996. Furthermore, Yellow River Conservancy Commission has began to implement Water-Sediment Regulation Scheme (WSRS) since 2002, to increase the main channel discharge capacity and to reduce deposition in the reservoirs and river channel. Surface sediment, multi-core and gravity sediment cores, remote sensing images and bathymetric data near the Yellow River delta were collected to study the impact of WSRS and river terminal change together with the water and sediment discharge at the gauging station. Especially, <sup>7</sup>Be, <sup>210</sup>Pb and <sup>137</sup>Cs, grain size, sediment color and TOC/TN was measured to show sedimentary record of WSRS and channel shift on inter-and intra-annual time scale. The results show that the fresh sediment from Yellow River  during 2014 WSRS period can be transported eastward more than 80 km off the rivermouth, while cannot pass 38° easily. Meanwhile the sediment can penetrate as deep as 12 cm. The subaerial delta area is mostly stable after 2002, and its balance is mainly controlled by the surrounding artificial coastline. The subaqueous delta changed from trapping about 4.6×10<sup>8</sup> t to being eroded ~ 3.1×10<sup>8</sup> t and 1.1×10<sup>8</sup> t each year during the three stages of 1976-1996, 1996-2002 and 2002-2014. It is proposed that the subaerial delta area will change little except for the Q8 outlet area, while the subaqueous delta evolution mostly depend on the Huanghe material besides the hydrodynamic conditions. In addition, the aim of WSRS to scour the lower riverbed will recede in future. This study deepens our understanding of the fluvial sediment disperse pattern and sedimentation under the influence of human activities and hydrodynamic conditions.</p><div>Acknowledgements</div><div> <div>This study was supported by National Programme on Global Change and Air-Sea Interaction (GASI-GEOGE-03) and the Natural Science Foundation of China (U1606401).</div> </div>

Analyses of trends and causes for variations in runoff and sediment load of the Yellow River

2017 ◽  
Vol 32 (2) ◽  
pp. 171-179 ◽  
Author(s):  
Hongling Shi ◽  
Chunhong Hu ◽  
Yangui Wang ◽  
Cheng Liu ◽  
Huimei Li
Keyword(s):  
Sediment Load ◽  
Yellow River ◽  
The Yellow River
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