Author(s): Chen Jianguo; Wang Chonghao
Linked Author(s): Chonghao Wang, Jianguo Chen
Keywords: Different reaches of the Yellow River; Water demand for sediment transport; Relationship of water and sediment; Allowable erosion and deposition level
Abstract: Based on the analysis of the characteristics of the water and sediment in the Ningxia to Inner-Mongolia reach and the lower reach of the Yellow River, three representative methods, namely data analysis method, erosion and silting correction method, and method from non-equilibrium sediment transport theory, were adopted to calculate the water-demands for sediment transport in this paper, and the requirement of water for the formation and maintaining a channel to transport sediment and flood in the Yellow River is also proposed. Furthermore, the effect of increasing the peak flow rate and flood duration by adjusting the operation of the upstream reservoirs on water requirement is demonstrated. The main findings are as follows: (1) With the predicted yearly incoming sediment of 0.12 billion T and the allowable sedimentation of 0.02 billion T in Inner Mongolia reach, the calculated water demands in flood season are 11.07 billion m³ and 10.65 billion m³ under the water and sediment conditions of the periods from 1956 to 2000 and from 1956 to 2010, respectively; (2) The calculated water demands in flood season in the Lower Yellow River are 16.39 billion m³ and 15.85 billion m³ with these two incoming water sediment series respectively, under the predicted yearly incoming sediment amount and allowable sedimentation of 0.9 billion T and 0.15 billion T; (3) the calculated water demand in flood season is much larger than the incoming flow since 1987, that means serious sedimentation of the Yellow River is inevitable; (4) the water demand for sediment transport is also related to the flood process, it can decrease by optimizing flood process in flood season, such as increasing the peak flow and flood duration.
Year: 2018