It is a widespread lack of data to support the assessments of hydropower cascade exploitation (HCE)
induced impacts over long periods. From 1977 to 2006, variations of land cover for successively eight dam
constructions were investigated by the application of RS data. The MSS and TM data were applied to
produce land cover maps in 1977 and 2006. In combination with data from national land cover database,
the data in these four years are applied to analyze land cover dynamics. The six first-level types land cover
change principles were concluded after calculation. The grassland was the most extensively converted type,
which reduced from 2162346 hato 2041691 ha. Other five categories land cover area increased during
HCE. Furthermore, the converted area was mapped out by transformation matrix analysis, which assess the
impact range for dam disturbances. The findings help future environmental impact prediction and improve
regional environmental management capabilities.
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