MECHANISM OF THE OCCURRENCE OF HYPOXIA IN HYPOLIMNION OF A RESERVOIR

In the Sengari Reservoir, algal blooms and hypoxia often occur adjacent to water surface and close to the bottom, respectively, due to stratification. Algal blooms may lead to musty smelling and tasting water. Therefore, it is needed to clarify the influence of stratification on water quality in the Sengari Reservoir. Field observations were carried out to understand the seasonal changes in stratification and dissolved oxygen in 2016. A three-dimensional environmental computational model was applied to clarify the mechanisms of the occurrence of hypoxia. It was revealed that a middle-layer aeration system plays a great role in the recovery from hypoxia in the Sengari Reservoir.