Journal of Geographical Sciences ›› 2007, Vol. 17 ›› Issue (4): 442-452.doi: 10.1007/s11442-007-0442-x

• Climate and Environmental Change • Previous Articles     Next Articles

Channel changes of the Makou-Tianjiazhen reach in the middle Yangtze River during the past 40 years

ZHANG Qiang1,2,3, CHEN Yongqin David1, JIANG Tong2, LI Maotian3   

  1. 1. Department of Geography and Resource Management and Institute of Space and Earth Information Science, The Chinese University of Hong Kong, Shatin, Hong Kong, China|
    2. Nanjing Institute of Geography and Limnology, CAS, Nanjing 210008, China|
    3. Laboratory for Climate Studies, National Climate Center, China Meteorological Administration, Beijing 100081, China|
    4. Laboratory of Geographic Information Science, East China Normal University, Shanghai 200062, China
  • Received:2007-03-27 Revised:2007-06-05 Online:2007-12-25 Published:2007-12-25
  • Supported by:

    The research was financially supported by the Laboratory for Climate Studies, National Climate Center, China Meteorological Administration, No.CCSF2007-35; Supported by the Research Grants Council of the Hong Kong Special Administrative Region, China, No.CUHK4627/05H

Abstract:

Quantitative analysis was performed on the filling-scouring process for the river reach within Makou and Tianjiazhen, the middle Yangtze River with the help of GIS and DEM techniques. The research results indicate that the river reach between Makou and Tianjiaz-hen was dominated by the scouring process, and the magnitude of scouring is increasing over time. The intensity of scouring process is more in the deep and narrower river reach than shallower and wider ones. The river reach in the Makou and Tianjiazhen river knot is in fre-quent scouring and filling process, however the river reach upper to the Makou and lower to the Tianjiazhen river knot is in moderate scouring and filling process. The river reach just upstream or downstream to the river knot (e.g. Makou and Tianjiazhen river knot in this re-search) is dominated by filling process and the river reach in the river knot is dominated by the scouring process. Research results indicate no changes in the boundary of the river but the scouring and the filling magnitude in specific river channel is strong. The filling and the scouring process of the study river reach is greatly impacted by the sediments and water from the upstream of the study river reach. The construction of the Three Gorges Dam just up-stream to Yichang will cause further decrease of the release of the sediment load to the mid-dle and the lower Yangtze River basin, which will further intensify the scouring process of the river channel in the study river reach.

Key words: Makou-Tianjiazhen river reach, GIS, DEM, river channel changes