Graduation of Ruurd Jaarsma

24 januari 2023 11:00 t/m 13:00 - Locatie: CiTG - Lecture Hall D, 23.HG.0.55 | Zet in mijn agenda

Quantifying suspended sediment using multi-frequency echosounder measurements

  • Professor of graduation: Dr. Ir. M.A. de Schipper

  • Supervisors: Dr. Ir. B.C. van Prooijen (TU Delft, Environmental Fluid Mechanics), MSc. M. Daugharty (Nortek Netherlands B.V.)

Echosounders are used to monitor suspended sediment concentrations (SSC) in Coastal Engineering studies and to monitor dredge plumes. Due to the dependency on sediment properties, performance of single frequency measurements is limited when sediment properties are changing. Using multiple frequencies, particle sizes can be estimated to adapt to these variations. Based on field measurements in the coastal waters around Texel, performance of the single and multi-frequency methods was assessed under steady and varying measurement conditions. While similarly high performance was obtained under steady conditions, the multi-frequency method outperformed the single frequency method significantly when measurements were taken over multiple tidal stages. Also, SSC derivations became less sensitive to selection of frequency. If further developed, the potential of SSC quantification using echosounders is significantly increased.