Acta Geographica Sinica ›› 2004, Vol. 59 ›› Issue (1): 136-142.doi: 10.11821/xb200401017

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Application of Surface Erosion of Sediment Yield Model to Jialingjiang Watershed

MURAKAMI Shogo, HAYASHI Seiji, WATANABE Masataka   

  1. Watershed Environment Management Projects, National Institute for Environmental Studies, Tsukuba 305-8506, Japan
  • Received:2003-10-22 Revised:2003-11-10 Online:2004-01-25 Published:2004-01-25
  • Supported by:

    Integrated Environmental Monitoring (IEM) Subproject, the Asia-Pacific Environmental Innovation Strategy Project (APEIS)

Abstract:

Though the annual total sediment load at Yichang hydro-station increased from the 1950s to the 1980s, it tended to decrease gradually in the 1990s. The reason of increase is due to violent deforestation and rapid landuse change, while that of decrease may be due to countermeasures taken to control sediment yields and lots of dams built on the upstream basins. The Jialingjiang River watershed is one of the main sources of sediments in the Changjiang river watershed, and the annual total load in the 1990s from the Jialingjiang River basin discharged into the Changjiang River reduced to about 36% of that before 1988. To clarify the reason of decrease of annual sediment-inflow rate in this basin is of great significance to sediment control related forest planning, reservoir sedimentation prevention at the Three Gorges Dam and habitat and ecosystems preservation in the Changjiang River, etc. In this study we developed a surface erosion type of sediment yield model for watershed slope, applied it to Jialingjiang River watershed in 1987, and investigated its applicability.

Key words: sediments, surface erosion, sediment yield model, Jialingjiang River