Design of measuring instrument with whole direct method for bed shear stress under two-dimensional water-flow co-action |
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Authors: | Hai-long Huang Qi-hua Zuo Yi-ren Zhou Yu-sheng Shen Lan-xi Li |
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Affiliation: | 1.Nanjing Hydraulic Research Institute,Nanjing,China;2.Key Laboratory of Port, Waterway and Sedimentation Engineering of MOT,Nanjing,China;3.Business School,Hohai University,Nanjing,China |
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Abstract: | The present study aims at the design and making of measuring instrument of whole direct method for bed shear stress under two-dimensional water-flow co-action. The instrument combines the traditional strain gauge with a precise pressure gauge, and adopts the method directly measuring the difference between the lateral hydrodynamic pressure and different head pressures on both sides of the force plate. As a result, such an instrument solves a technical puzzle of the past strain gauge, i.e. the difficulty to set apart shear stress and lateral force. Static force test and sink test both prove that the instrument is precise, stable and applicable to the measurement of rough beds with different shear stresses. |
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