Effects of Hydrodynamic Conditions on Algal Organism Growth

The growth of algal organisms is influenced by hydrodynamics, making it a crucial aspect of algal biology. We summarize recent studies on the impact of hydrodynamics on algal growth, with a specific focus on current velocity. In the past, extensive attention has been paid to the direct effects of impact factors on algal blooms and there is still a certain gap in the impact mechanisms at the cellular level. Recent literature is compared to review the effects of current velocity, flow change the water level, and the mechanism of hydrodynamic effects on algal blooms, thereby briefly summarizing the effects of temperature, light, DO, and nutrient concentration on algal blooms. The critical thresholds for temporal flow velocity and temporal wind velocity are also provided for two eutrophication lakes, Taihu Lake and Poyang Lake, aiming to provide a reference for the flow velocity classification criteria of the three major water bodies: Nullahs, rivers, and lakes. The mechanism of hydrodynamic conditions on algal growth is mainly reflected in three aspects: (1) It affects the distribution of nutrient salts and then regulates the growth and enrichment of algae; (2) It alters the transport process of nutrient salts and affects the cell function; (3) It destroys the integrity of the cell structure of algae and inactivates them. The results are significant for understanding the growth mechanism of algal organisms under hydrodynamic conditions and provide guidance for future research.