This process was repeated however, the amplitude of increase or decrease was inconsistent, which led to the generation of a certain amount of acoustic radiation effect, and it had a similar trend of change with the acceleration of bubble volume. Meanwhile, the acceleration of bubble volume decreased first and then increased. The velocity of the rising bubbles in the direction of the z axis was much higher than that of the x axis. After the rising velocities of the bubbles in the z and x directions were compared, the results revealed that the rising velocity of the bubbles was unstable. Results showed that during the rise of bubbles, their shape gradually changed from spherical to irregular, and their rising trajectory presented a curvilinear form. This paper proposes an image processing method to study the movement and acoustic radiation characteristics of the rising bubbles originating from the combustion of a pyrotechnic composition based on high-speed photography. Hence, the AutoCAD technique provides a new way for baseflow separation.īubble volume and bubble geometry are key parameters that affect the movement and acoustic radiation performance of bubble columns. The greatest benefits of using AutoCAD for calculation are to reduce the workload, enhance the efficiency, and provide more precise results. During the manual baseflow separation process, it makes the calculation workload substantial. The AutoCAD technique is essentially manual baseflow separation using the drafting tools available in AutoCAD. Secondly, it is always thought that the manual method for baseflow separation is based on physical reasoning. Each pass will result in less baseflow as a percentage of total flow. Value must refer to manual method for baseflow separation. Firstly, the automated technique neither has the true physical basis, nor the relation to groundwater movement. The AutoCAD technique of baseflow separation is chosen for two reasons. Baseflow of the Jing River drainage area is 538 million m3/a, which accounts for 47.0 % of the total, and baseflow of the Wuding River drainage area is 352 million m3/a, which accounts for 30.8 %. River baseflow of the Cretaceous system in the Ordos Basin is 1.143 billion m3/a. The catchment areas with the hydrological data in the southern region of the Cretaceous system are divided into seven categories according to the distribution characteristics of physical geographic conditions, watershed, lithology and geological structure.
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