Water quality behavior in a reservoir having anaerobic heavy bottom layer coupled with inverse temperature gradient

Based on water quality measurements in a stratified reservoir, it is discussed how thermal structure and dissolved oxygen concentration affect water quality behavior. The field measurement shows the reservoir has a multi-density structure consisting of temperature and material concentrations. The water body is so stable that no overturning has taken place even in winter, which makes the bottom water anaerobic and very eutrophic. It is found that shortage of dissolved oxygen is mostly responsible for highly concentrated organic and non-organic compounds in the reservoir bottom.