Acta Geographica Sinica ›› 2015, Vol. 70 ›› Issue (7): 1137-1148.doi: 10.11821/dlxb201507010

• Hydrology • Previous Articles     Next Articles

Calculation methods for deposition volume in non-flood and flood seasons in the Inner Mongolia reach of the Yellow River

Yanjun WANG(), Baosheng WU, Yongqiang WANG, Deyu ZHONG   

  1. State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China
  • Received:2015-03-11 Revised:2015-04-20 Online:2015-07-20 Published:2015-08-11
  • Supported by:
    National Key Basic Research and Development Program of China, No.2011CB403304;National Science and Technology Support Program Projects during the 12th Five-year Plan, No.2012BAB02B02

Abstract:

:Based on the empirical sediment transport equation that reflects the characteristics of "more input, more output" for sediment-laden flow rivers, a general sediment transport expression was developed, which takes into account the effects of upstream sediment input, previous cumulative erosion and sedimentation, critical water volume for sediment initiation and the differences of sediment sizes between the main stream and its tributaries. Then, sediment load equations of non-flood and flood seasons for the sub-reaches from Bayangaole to Sanhuhekou and from Sanhuhekou to Toudaoguai, as well as the whole Inner Mongolia reach from Bayangaole to Toudaoguai, were obtained based on measured data from 1952 to 2010. Furthermore, the corresponding erosion and sedimentation and the cumulative values at each river reach were calculated using the proposed sediment transport equations for the period from 1952 to 2010 according to the principle of sediment conservation. Comparisons between the calculated and measured values using the proposed sediment load equations for the sub-reaches and the whole reach show that the calculated sediment load and erosion and sedimentation and corresponding cumulative values in the non-flood and flood seasons were in good agreement with measurements; the determination coefficient R2 between the calculated and measured sediment load is about 0.93 and 0.97 for the non-flood and flood season, respectively; the determination coefficient R2 between calculated and measured the erosion and sedimentation for the non-flood and flood season is about 0.80 and 0.90; and the R2 between the calculated and measured cumulative erosion and sedimentation is about 0.94 and 0.99. It is obvious that the agreement of cumulative erosion and sedimentation was higher than that of the corresponding annual values, and the agreement of flood seasons was higher than that of non-flood seasons. These results indicated that the proposed methods can be applied to calculate the sediment load and erosion and sedimentation in the non-flood and flood seasons; and they can provide a scientific basis for the analysis of sediment load and the long-term trend of sediment deposition in the Inner Mongolia reach of the Yellow River.

Key words: Inner Mongolia reach of the Upper Yellow River, sediment load, erosion and sedimentation, non-flood and flood seasons