Abstract
In order to obtain adequate water resources, the decision to build water reservoirs is unavoidable. However, the large amount of sand and rocks washed out from upstream shortens the lifespan of the water reservoirs. Therefore, the sediment needs to be cleared away to prolong the lifespan of the reservoirs, secure the water storage in the water reservoirs and improve their efficiency to achieve the best economic benefits. This research aimed to discuss the reasons for geographical and environmental change, as well as natural ecological destruction due to construction of water reservoirs. The findings could serve as a reference to further ecological engineering projects to restore ecological and geographical conditions, and to improve the land degradation situation caused by the construction of water reservoirs.
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