Abstract
In order to discuss spatial and temporal distributions of blue-green algae in limnetic water with optical depth and vertical mixing, laboratory and field experiments of air circulation process were conducted, focusing on two key parameters: E mix: E u-ratio of mixing depth and euphoric zoon depth, and V mix-vertical mixing rate. Results show that dynamic equilibrium of algal vertical distribution appeared beyond 20 h. Within 2 h, algal bloom cannot develop at water surface with V mix ≥ 1.08 cm/min; while the same situation could last for above 20 h with V mix ≥ 1.35 cm/min. Coefficient of variation (CV) is introduced to depict algal vertical dispersion, and 3-order magnitude differences of CV were classified. The result also shows that K-the rate constant of algal decay holds positive correlation with E mix: E u (R 2=0.85), indicating that E mix: E u was contributive to precipitating algal decline. Besides, field experiment showed that algal bloom disappeared as E mix: E u ≥ 3.
| Original language | English |
|---|---|
| Pages (from-to) | 2058-2064 |
| Number of pages | 7 |
| Journal | Zhongguo Huanjing Kexue/China Environmental Science |
| Volume | 31 |
| Issue number | 12 |
| State | Published - Dec 2011 |
| Externally published | Yes |
Keywords
- Air circulation
- Algal control
- Lighting
- Mixing