Sediment Transferring Function of the Lower Yellow Riveras Influenced by Discharge and Sediment Load Conditions

Expand
  • Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101

Received date: 2003-08-19

  Revised date: 2003-12-08

  Online published: 2004-05-20

Abstract

The sediment transferring function of the lower Yellow River has been studied in this paper by using a geomorphological approach. An index for sediment transferring function (Fs) of a river has been proposed, which is defined as the output of sediment load from a given river reach divided by the input of sediment load to this river reach. The Fs index was found to be closely related with discharge and sediment load conditions. When water discharge decreased and sediment load increased, Fs decreased. The >0.05mm percentage in suspended load was negatively correlated with Fs. The index C/Q, especially the index C>0.05/Q, where C is suspended sediment concentration, C>0.05 is the concentration of the >0.05mm sediment, and Q is water discharge, is a major factor determining sediment transferring function of the lower Yellow River. The higher the C/Q and C>0.05/Q are, the lower the Fs will be. The event-based Fs decreased with both the increasing event maximum suspended concentration and the increasing frequency of hyperconcentrated flows. The construction of Xiaolangdi Reservoir provides some possibility for enhancing the sediment transferring function of the lower Yellow River by means of water discharge and sediment load regulation. This study shows that the event-averaged suspended sediment concentration C=35 kg/m3 and the event-averaged index C/Q=(0.015 kg·s)/m6 are the optimal values for the optimization of Fs, and so is the bankfull water discharge.

Cite this article

XU Jiong-Xin . Sediment Transferring Function of the Lower Yellow Riveras Influenced by Discharge and Sediment Load Conditions[J]. SCIENTIA GEOGRAPHICA SINICA, 2004 , 24(3) : 275 -280 . DOI: 10.13249/j.cnki.sgs.2004.03.275

References

[1] 许炯心. 论黄河下游河道两次历史性大转折及其意义[J]. 水利学报,2001,(7): 1~7.
[2] 许炯心. 低流量及间歇性断流条件下黄河下游的河床沉积过程与形态调整[J].泥沙研究,2002,(1): 10~17.
[3] Schumm S A. The Fluvial System[M]. New York: John Wiley & Sons, 1977.1-338.
[4] 钱宁,万兆惠. 泥沙运动力学[M].北京:科学出版社,1983.1~656.
[5] 钱宁, 王可钦, 阎林德,等. 黄河中游粗泥沙来源区对黄河下游冲淤的影响. 见:中国水利学会(主编).第一次河流泥沙国际学术讨论会论文集. 北京:光华出版社,1980.53~62.
[6] 钱宁,万兆惠,钱意颖. 黄河的高含沙水流问题[J].清华大学学报,1979, 19(2):1~17.
[7] 许炯心.黄土高原高含沙水流形成的自然地理因素[J].地理学报,1999, 54(4): 319~`326.
[8] 赵业安, 周文浩, 费祥俊, 等. 黄河下游河床演变基本规律[M].郑州:黄河水利出版社,1997.51.
[9] 王明甫. 黄河干支流的高含沙水流. 见:赵文林.黄河泥沙[M]. 郑州:黄河水利出版社,1996.595~615.
[10] 许炯心. 黄河下游洪水的泥沙输移特征[J]水科学进展,2002, 13(5): 362~368.
Outlines

/