Field measurement of the erosion threshold of silty seabed in the intertidal flat of the Yellow River Delta with a newly-developed annular flume

Accurately measuring the critical shear stress is crucial for numerous applications, such as sediment transport modeling, erosion prediction, and design of sustainable coastal engineering structures. However, developing reliable precise in-situ measurement devices faces significant challenges due to harsh dynamic nature aquatic environments. Factors like turbulence waves introduce complexities that must be considered when designing calibrating these devices. The newly developed Openable Underwater Carousel In-situ Flume (OUC-IF) was used determine ( τ c ) quantify rates. Acoustic Doppler Velocimeter (ADV) employed measure 3D near-bottom velocities, which were then estimate pre-calibrate bed (τ) applied on seabed in annular flume. Three computation methods evaluated: turbulent kinetic energy (TKE), direct covariance (COV), log profile (LP). experiments conducted first time at two sites tidal flat Yellow River Delta (site 1 with a water depth 1.32 m site 2 0.75 m). found 0.10 Pa 0.19 2, rates sediments successfully measured. effect wave-seabed interactions resistance explored by theoretically estimating wave-induced pore pressure based observed data. max liquefaction degree 0.035 0.057, respectively, average coefficient Me 2.63E-05 kg -2 s -1 3.48E-05 2.