Influence of Water Regulation on Internal Heavy Metal Load for a Tide-Influenced Waterfront Lake

Abstract

The Inner Lake, a typical waterfront lake was selected as the research area. By field investigation and laboratory experiment, the spatial distribution of Pb content in deposited sediments was analyzed and the relationship between Pb release rate and flow disturbance was established. A numerical model was constructed to evaluate the Pb load prior to and post the exchanged water regulation in different typical years. The results show that: influenced by the variable hydrodynamic conditions of the Yangtze River, the average Pb pollution load is the highest in high-water year; water regulation has an obvious impact on Pb pollution load in the Inner Lake, which is decreased by 65.12%, 54.53% and 62.89% in the three typical years respectively post water regulation.