求翻译：用尺寸、材质、质量一定的小球测量渠道表层流速，通过数据模型所建立的断面平均流速与表层流速直接的换算关系以达到简化测流方式的目的是什么意思？

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The size, quality, and quality of the ball measurement channel surface flow, the data model as a cross-section of the average flow rate and surface flow direct conversion with a view to simplifying test flow of purpose

With the size, the material quality, the quality certain pellet survey channel surface layer speed of flow, the cross section mean velocity of stream and the surface layer speed of flow direct conversion relations which establishes through the data model achieved the simplification measured flows th

Dimensions, materials, the quality of ball surface velocity measurement channels, through the data model establishment of average velocity and the surface velocity direct conversion factors for the purpose of simplified method for discharge measurement

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