Journal of Geographical Sciences ›› 2007, Vol. 17 ›› Issue (1): 85-100.doi: 10.1007/s11442-007-0085-y

• Climate and Environmental Change • Previous Articles     Next Articles

The characteristics of dike-break flood in different scenarios of the lower Yellow River based on numerical simulations

MA Xin1,2, YANG Peiguo1,2, YANG Qinye1, KANG Xiangwu3, XIA Fuqiang1,2   

  1. 1. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China|
    2. Graduate School of the Chinese Academy of Sciences, Beijing 100039, China|
    3. Institute of Scientific and Technical Information of China, Beijing 100038, China
  • Received:2006-10-19 Revised:2006-11-26 Online:2007-03-25 Published:2010-09-18
  • Supported by:

    The State Scientific Research Plan, No.96-920-09-01

Abstract:

The lower Yellow River still faces the threat of flood due to the unusual precipita-tion caused by global environmental change, river channel sedimentation, hidden danger in the dike and unfavorable river regime of “hanging river”. According to the characteristics of the dike-break flood of the Yellow River, this paper has simulated, in six different scenarios, the dike-break flood routing by inputting the terrain data, typical historical flood data and land use data of study area to two-dimensional unsteady flow model. The results show that: firstly, the routing process of flood will occupy other rivers on the way and return to the rivers after reaching the lower reaches; secondly, in the same river reach, flood inundating area of north band is bigger than that at corresponding location of south bank under the same historical flood; thirdly, it is different in the degree of flood inundation in different regions due to different geographical locations in flood plain; fourthly, the area of mainstream where flood is deep and flow velocity is quick is relatively smaller, but the area of non-mainstream, where flood is shallow and flow velocity is slow, is relatively big; and finally, the possible influenced area of the dike-break flood is 141,948 km2.

Key words: lower Yellow River, dike-break, 2-dimensional unsteady flow model, characteristics of the flood routing