Simulation of technical scenarios for controlling eutrophication in shallow lakes: A case study of Cu Chinh lake, Hanoi

Abstract

   Today, there are many technical measures with the aim of controlling eutrophication in shallow lakes in urban areas. However, evaluating the effectiveness as well as pointing out the advantages and disadvantages of technical measures to control the eutrophication in the lakes is usually very difficult or
even impossible. In this paper, a eutrophication model previously developed by the authors is used to simulate and evaluate scenarios of aeration, dredging of sediments and the use of algaecide in Cu Chinh Lake which is severely eutrophic. The simulation results show the advantages of measures such as sediment dredging reduces dissolved inorganic phosphorus (DIP) by up to 61.07% while aeration increases dissolved oxygen concentration in water by 24.9% and the use of algaecide reduces the concentration of algae biomass in the lake by 16.45%. The implementation of simulation scenarios has provided a reliable scientific basis to evaluate the effectiveness of eutrophication control measures in Cu Chinh Lake in particular and shallow lakes in the inner city of Hanoi in general