Dam Urban River Flow Characteristics And Dissolved Oxygen Distribution

The river city formation and development of the most critical resources and thecarrier, the development direction of China in the urban river regulation should becomprehensive management of rivers and river ecological construction. Flume modeltests simulated urban river hydraulic conditions, the rubber dam built on city river thesize of the opening size to conduct further studies. The the urban river flow and slopechanges of urban river hydraulic characteristics and dissolved oxygen changes, takinginto account the eco-city river training.The experiment is divided into the whole dam operation, opening the damoperation, opening the dam+gate operation, the the opening dam operation and openingsdam+gate run using two opening size. The tests were carried out45conditions.Trial, built on city river water retaining structures in three different slope, differenttraffic urban river flow characteristics and dissolved oxygen changes were. The resultsshow that:(1) five kinds of rubber dam type running along the section depthcomparison, dam, dam water depth showed more consistent variation by small to big,water depth in the water passing the dam suddenly decreased. Presents a step change inwater depth along the slope the greater the flow, slope conditions selected by the test,stepped distribution of the more obvious.(2) five kinds of rubber dam dam runs alongthe cross-sectional flow rate compared. Dam flow rate along the dam flow rate along theway, from large to small from big to small, flatten. Opening the dam opening operationof the flow rate of the dam b is greater than the whole dam.(3) five kinds of rubberdam-type running along the cross-section of dissolved oxygen compared longitudinaldistribution as a whole showed a subtle phenomenon: from large to small (in front of thedam), from small to big (passing the dam), from large to small and then changed Theflatten (dam). The full dam Runtime, dissolved oxygen in a cross-sectional distribution.Opening the dam a dissolved oxygen in the dam before and after opening the dam bfrom the left bank to right bank of the ladder reduced status. Opening dam az openingthe dam the bz dam on the left bank dissolved oxygen values less than the dissolvedoxygen value of the right bank of the dam, the lowest dissolved oxygen content of theleft rear of the dam, the larger the size of the gate, the greater the area of small values of dissolved oxygen, compared to the opening dam az, the opening dam bz dam dissolvedoxygen distribution more volatile. The same slope, the greater the flow, the greater theminimum area, the same flow rate, the slow slope of the minimum value of the largersize of the area.