Distribution of TN and TP in Dongchang Lake from Sediment and Non-sediment Water Recharge Based on MIKE21

With the continuous increase of urban population, eutrophication lakes is becoming more and serious. It necessary to improve ecological environment by water supplement. In this study, TN (total nitrogen) TP phosphorus) Dongchang Lake before after replenishment were sampled measured, hydrodynamic, quality sediment MIKE21 models established. Finally, variation trend non-sediment simulated, following conclusions are drawn: During replenishment, concentration each point will rise, higher. After completion process, at decreases in turn. Under two modes, difference gradually become narrower, but The change similar that TP, caused supply, remains high next few days. This study provides an empirical basis for development lake improvement strategies.