Manometer tubes for monitoring coastal water levels: New frequency response factors

摘要

This paper presents findings of new laboratory experiments on the frequency response of semi-rigid manometer tubes for use in monitoring coastal hydrodynamic processes, extending and improving upon the previous work of Nielsen et al. (1993). An adjustable speed rotary electromotor was used to drive a known water level variation at one end of the tube and the pressure was measured at both ends of the tube, enabling a direct determination of the tube's frequency response. Testing was conducted over a range of frequencies (0.0067 Hz