JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI ›› 2016, Vol. 33 ›› Issue (7): 1-5.DOI: 10.11988/ckyyb.20150336

• RIVER-LAKE SEDIMENTATION AND REGULATION •     Next Articles

Delayed Response of Cross Section Area to Variable Incoming Flow and Sediment at Shashi Segment of Yangtze River

ZHANG Yun-chao1, LI Ling-yun1,2, FAN Bei-lin1,2, ZHENG Shan3   

  1. 1.River Department, Yangtze River Scientific Research Institute, Wuhan 430010, China;
    2.Key Laboratory of River Regulation and Flood Control of MWR, Yangtze River Scientific Research Institute, Wuhan 430010, China;
    3. School of Water Resources and Hydropower Engineering,Wuhan University,Wuhan 430072, China
  • Received:2015-04-21 Online:2016-07-01 Published:2016-07-11

Abstract: Analysis on the measured flow and sediment data of the middle reaches of the Yangtze River as well as the section data indicates that the adjustment of channel morphology at Shashi station is delayed to the variation of flow and sediment conditions. In order to obtain the regularity of delayed response of Shashi section, we improved the delayed response model for river evolution in the Yellow River in three aspects: 1) define the cross section area at the annual average low water level of Shashi section as the characteristic variable of the delayed response model; 2) introduce the “yearly combined flow” ;3) use the piecewise function in the iterative formula of the model. The results show that the determinant coefficient R2 of delayed response model for river evolution at Shashi section is between 0.7 and 0.8.

Key words: alluvial river, river bed evolution, variations of incoming flow and sediment, delayed response, section area, Shashi station of Yangtze River

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