scholarly journals Analysis of Runoff-Sediment Cointegration and Uncertainty Relations at Different Temporal Scales in the Middle Reaches of the Yellow River, China

Water ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2589
Author(s):  
Xiujie Wang ◽  
Dandan Li ◽  
Ximin Yuan ◽  
Xiling Qi ◽  
Pengfei Zhang
Keyword(s):  
Sediment Load ◽  
Yellow River ◽  
Hysteresis Loops ◽  
Yellow River Basin ◽  
Sediment Concentration ◽  
The Yellow River ◽  
Uncertainty Relations ◽  
Rating Curves ◽  
Runoff Sediment ◽  
Cointegration Relationship

To understand the intricate runoff-sediment relationship in the middle Yellow River basin (MYRB), the Toudaoguai, Longmen, Tongguan and Huayuankou sites in the MYRB were selected to analyze the deterministic equilibrium and uncertainty relations of runoff-sediment based on 55-year hydrological data at multi-time scales. The Johansen test and wavelet neural network were used to verify the cointegration relationship among hydrological series. Runoff-sediment uncertain statistical relations and dynamics in the MYRB were also analyzed based on rating curves and hysteresis loops. The results showed that the logarithmic sequences of sediment load (SL), runoff and suspended sediment concentration (SSC) conformed to a linear cointegration relationship at the Toudaoguai station or in spring, winter or under small flow at other stations, but a nonlinear cointegration relationship was observed in other cases at other stations. Regarding runoff-sediment uncertain relationships, the rating curves, and hysteresis loops differed in stations (Toudaoguai and the other stations), as well as discharge (threshold: 1000 m3/s), season (ice-flood and rainy season) and saturation of flow at flood and monthly scales. At the annual scale, phased and unsynchronized characteristics of runoff and sediment load were evident with a decreasing trend. This study on the runoff-sediment relationship can rationally provide a theoretical basis for the management and development of the Yellow River and other similar rivers with sufficient sediment, especially for areas with serious soil erosion.

scholarly journals Recent changes of water discharge and sediment load in the Yellow River basin, China

2010 ◽  
Vol 34 (4) ◽  
pp. 541-561 ◽  
Author(s):  
Chiyuan Miao ◽  
Jinren Ni ◽  
Alistair G.L. Borthwick
Keyword(s):  
River Basin ◽  
Abrupt Change ◽  
Sediment Load ◽  
Yellow River ◽  
Water Discharge ◽  
Kendall Test ◽  
Yellow River Basin ◽  
Test Method ◽  
The Yellow River ◽  
The Yellow River Basin

The Yellow River basin contributes approximately 6% of the sediment load from all river systems globally, and the annual runoff directly supports 12% of the Chinese population. As a result, describing and understanding recent variations of water discharge and sediment load under global change scenarios are of considerable importance. The present study considers the annual hydrologic series of the water discharge and sediment load of the Yellow River basin obtained from 15 gauging stations (10 mainstream, 5 tributaries). The Mann-Kendall test method was adopted to detect both gradual and abrupt change of hydrological series since the 1950s. With the exception of the area draining to the Upper Tangnaihai station, results indicate that both water discharge and sediment load have decreased significantly (p<0.05). The declining trend is greater with distance downstream, and drainage area has a significant positive effect on the rate of decline. It is suggested that the abrupt change of the water discharge from the late 1980s to the early 1990s arose from human extraction, and that the abrupt change in sediment load was linked to disturbance from reservoir construction.

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