SCIENTIA GEOGRAPHICA SINICA ›› 2004, Vol. 24 ›› Issue (3): 275-280.doi: 10.13249/j.cnki.sgs.2004.03.275

Previous Articles     Next Articles

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

XU Jiong-Xin   

  1. Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101
  • Received:2003-08-19 Revised:2003-12-08 Online:2004-05-20 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.

CLC Number: 

  • P333.4/P931.1