| Popis: |
Dissolved oxygen is one of the important parameters which describe whether the aquatic ecosystem is healthy or not.This research used meteorological data including wind velocity,direction and short wave radiation from August 16th to 20th in 2008 and relevant parameters for water quality module as an initial field to drive FVCOM(An Unstructured Grid,Finite-Volume Coastal Ocean Model),and simulated 3-D water temperature and dissolved oxygen of Lake Taihu.It turned out that the simulated results were fitted with the observed ones on the whole.The regression equation for water temperature is y=1.02x with the determination coefficient R2=0.690,comparing to R2=0.760 for dissolved oxygen.By analyzing the temporal and spatial distribution of dissolved oxygen,we preliminarily explored the influence of sources and sinks on the dissolved oxygen of Meiliang Bay.Solar radiation and wind speed were two important factors influencing the diurnal stratification of water temperature.Dissolved oxygen in Meiliang Bay in summer was influenced by water temperature and light with vertical distribution and presented "double peaks and double valleys" trend.Photosynthesis of phytoplankton was the most important source of the dissolved oxygen and light attenuation underwater directly controlled the vertical distribution of primary productivity.The respiration and death of phytoplankton depleted the most of dissolved oxygen,and the remaining dissolved oxygen was depleted by sediment oxygen demand,biochemical oxygen demand,bacterial respiration and nitrification oxygen demand,respectively. |
