Influence of Dam Construction of Wan Chuan Reservoir on Water Environment

1, changing the succession of aquatic ecosystem. After the completion of the reservoir, the original river pattern disappeared and became a deep-water artificial lake. The bottom water temperature of reservoirs with lower water velocity and deeper water depth is lower all the year round. The original river ecosystem is difficult to adapt to this change, and most of the original river species disappear and gradually evolve into a lake ecosystem dominated by exotic species. As a result, the precious biodiversity of rivers decreases and the ubiquitous species increases.

Water quality changes. The flowing water can be oxygenated through the water surface, with high dissolved oxygen content and strong self-purification ability, and the flowing water does not rot. After the formation of the reservoir, the water body has been in a static state for a long time, and the pollutants flowing into the reservoir around it have accumulated for a long time, and the water quality in the reservoir area has been deteriorating, even eutrophication has occurred and water blooms have increased. This phenomenon is actually the result of ecological imbalance in the reservoir area.