Tham khảo tài liệu 'hydrodynamics natural water bodies part 3', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Hydrodynamic Control of Plankton Spatial and Temporal Heterogeneity in Subtropical Shallow Lakes 37 Calculated vs. Observed Values Dependent variable Turbidity Calculated Values 95 Confidence Fig. 6. Comparison between observed and calculated values for turbidity and suspended solids through multiple regression model using the three monitoring station along the Itapeva Lake. Calculated Values 95 Confidence Interval Interval Lake Mangueira The simulated and observed values of water levels at two stations of Lake Mangueira during the calibration and validation period are shown in Fig. 7. An independent validation data set showed a good fit to the hydrodynamic module R2 . The model was able to reproduce the water level well in both extremities of Lake Mangueira. Wind-induced currents can be considered the dominant factor controlling transport of substances and phytoplankton in Lake Mangueira producing advective movement of superficial water masses in a downwind direction. For instance a southwest wind with magnitude approximately greater than 4ms-1 can causes a significant transport of water mass and substances from south to north of Lake Mangueira leading to a almost instantaneous increase of the water level in the northeastern parts and hence the decrease of water level in southwestern areas Fig. 7 . Our model results showed two characteristic water motions in the lake oscillatory seiche and circulatory. Lake Mangueira is particularly prone to wind-caused seiches because of its shallowness length ca. 90 km and width ca. 12 km . These peculiar morphological features lead to significant seiches of up to 1 m between the south and north ends caused by moderate-intensity winds blowing constantly along the longitudinal axis of the lake NE-SW . Depending on factors such as fetch length and the intensity and duration of the wind areas dominated by downwelling and upwelling can be identified Fig. 8 . For instance if northeast winds last longer than about 6 h the .
