Abstract: The algal barrier at the water source was considered as the research object. The filtering and interception effects of the barrier on algae were investigated in details. It was explored that the main factors affecting the pollution interception effects of the barrier and the mechanism of the filtering and interception processes of the barrier through experimental simulation. The cleaning and recycling performances of the barrier were studied. By setting up an algal barrier in the field, the total amount of change was compared in algae before and after filtering by the barrier, and the actual algae removal ability of the barrier was verified. The experimental results showed that the water source containment had an interception effect on the algae in the water. There was a large difference in the total amount of algae before and after the containment. In the range of 0$\sim$0.03 m$^3$/(m$^2\cdot$s), the higher the through-water flux, the lower was the algae removal efficiency. Beyond 0.03 m$^3$/(m$^2\cdot$s), the removal rate was less than 5%. In the 10$\sim$60 NTU range, the higher the turbidity, the better was the algae removal effect. Chlorophyll a concentration did not have a significant effect on the perimeter filter interception. The filter cake filtration model was the main pollution interception mechanism in perimeter filtration and had good cleaning and recycling abilities.

Key words: water source reservoir, enclosure, interception efficiency, chlorophyll a