Quantifying suspended sediment using multi-frequency echosounder measurements

Quantifying suspended sediment using multi-frequency echosounder measurements: Assessing the potential of single instrument sediment concentration inversions that account for variations in particle size

Jaarsma, Ruurd (TU Delft Civil Engineering & Geosciences)

van der Lugt, M.A. (mentor)
Daugharty, M. (mentor)
de Schipper, M.A. (graduation committee)
van Prooijen, Bram (graduation committee)

Delft University of Technology

Civil Engineering | Hydraulic Engineering

2023-01-24

Echosounders are used to monitor suspended sediment concentrations (SSC) in coastal management studies and to monitor dredge plumes. Due to the dependency on sediment properties like particle size, shape and density, performance of single frequency measurements is limited when sediment properties are changing.

Using multi-frequency measurements, mean particle sizes can be derived and used to (partly) 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 estimations became less sensitive to selection of frequency. If further developed, the potential of SSC quantification using echosounders is significantly increased.

echosounder
ADCP
measurements
backscatter
sediment
SSC
OBS
monitoring
surveying
Molengat
Texel
Marsdiep
morphology
dredging
acoustics
acoustic backscatter

http://resolver.tudelft.nl/uuid:82cfb0e6-863a-4f85-a8bc-7c5e16c69b05

52.991365, 4.709276

Student theses

master thesis

© 2023 Ruurd Jaarsma