The Huanghe River (Yellow River) is known by its high suspended sediment concentration (SSC) in its river mouth tidal flat. However, the factors controlling the high SSC over there are not well understood. Therefore, we conducted 7-d hydrodynamic observations (water depth, wave height, and current velocity) and SSC measurements on the tidal flat off the Huanghe River Mouth. The data shows that in most of time, under the calm sea condition, the SSC ranges 0.1–3.5 g/L, and sediment discharge from the river is the main source. However, when hydrodynamics are enhanced in a tidal cycle and large-scale erosion occurs on the seafloor, resuspended sediment becomes the main source, and the SSC in the water column reaches 17.3 g/L. We find the suspended sediment flux is mainly controlled by the tidal current and Stokes drift, while the wave-induced shear stress could also affect the variation of suspended sediment flux. During the observation period, when sea under calm-rippled conditions, the current-induced resuspended sediment concentration (RSC) was greater than the wave-induced RSC. In contrast, in smooth-wavelet sea conditions, the wave-induced RSC was greater than the current-induced RSC, for instance, a single wave event was found to cause 11.8 cm seabed erosion within 6 h. This study reveals different controlling factors for the high SSC near a river-influenced tidal flat, and helps us get a better understanding of a delta’s depositional and erosional mechanisms.

黄河（黄河）以其河口潮滩中的高悬浮泥沙含量（SSC）而著称。但是，那里控制高SSC的因素尚不十分清楚。因此，我们在黄河口附近的潮滩进行了7天水力观测（水深，波高和水流速度）和SSC测量。数据显示，在大多数情况下，在平静的海况下，SSC的变化范围为0.1-3.5 g / L，河流的沉积物排放是主要来源。但是，当潮汐循环中的流体动力学增强并且海底发生大规模侵蚀时，重悬的沉积物成为主要来源，水柱中的SSC达到17.3 g / L。我们发现悬浮的泥沙通量主要由潮流和斯托克斯漂移控制，波浪引起的切应力也可能影响悬浮泥沙通量的变化。在观测期间，当海在平静波动的条件下，电流引起的悬浮沉积物浓度（RSC）大于波浪引起的RSC。相反，在光滑小波海况下，波浪引起的RSC大于当前波浪引起的RSC，例如，发现单个波浪事件会在6 h内造成11.8 cm海床侵蚀。这项研究揭示了在受河水影响的潮滩附近高SSC的不同控制因素，并有助于我们更好地了解三角洲的沉积和侵蚀机制。当前引起的悬浮泥沙浓度（RSC）大于波浪引起的RSC。相反，在光滑小波海况下，波浪引起的RSC大于当前波浪引起的RSC，例如，发现单个波浪事件会在6 h内造成11.8 cm海床侵蚀。这项研究揭示了在受河水影响的潮滩附近高SSC的不同控制因素，并有助于我们更好地了解三角洲的沉积和侵蚀机制。当前引起的悬浮泥沙浓度（RSC）大于波浪引起的RSC。相反，在光滑小波海况下，波浪引起的RSC大于当前波浪引起的RSC，例如，发现单个波浪事件会在6 h内造成11.8 cm海床侵蚀。这项研究揭示了在受河水影响的潮滩附近高SSC的不同控制因素，并有助于我们更好地了解三角洲的沉积和侵蚀机制。