Field observation of the wave-induced pore pressure response in a silty soil seabed

Xu, Xingbei; Xu, Guowen; Yang, Junjie; Xu, Zhongqian; Ren, Yupeng

doi:10.1007/s00367-020-00680-6

Cited by 19 publications

(7 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The surface sediment near the site is silty ( d 50 = 0.052 mm, clay content CC = 7.65%), and the grain size distribution accumulation curve of surface sediment near the observation site is shown in Figure 2. Despite lack of direct evidence, many studies suggest that winter storms in our study area can induce liquefaction of seabed (Liu et al., 2020; Xu et al., 2021) as stated in Section 1. Our field observation covered the whole winter and observed multiple seabed liquefaction events caused by storms.…”

Section: Methodsmentioning

confidence: 71%

“…The area experiences the increasing severity of estuarine erosion and topographical changes (Wang et al., 2007), and the intensity of sediment transport in winter is much stronger than in summer due to the strong effect of winter storms (Yang et al., 2011). By field monitoring of liquefaction in the subaqueous Yellow River Delta, it is found that seabed liquefaction can happen to a depth ranging from tens of centimeters to several meters during a storm (Liu et al., 2020, 2022; Xu et al., 2021). Xu et al.…”

Section: Introductionmentioning

confidence: 99%

“…The area experiences the increasing severity of estuarine erosion and topographical changes (Wang et al, 2007), and the intensity of sediment transport in winter is much stronger than in summer due to the strong effect of winter storms (Yang et al, 2011). By field monitoring of liquefaction in the subaqueous Yellow River Delta, it is found that seabed liquefaction can happen to a depth ranging from tens of centimeters to several meters during a storm (Liu et al, 2020(Liu et al, , 2022Xu et al, 2021). Xu et al (2021) suggest that silty soil seabed liquefaction starts when the significant wave height reaches 0.5 m (for 8-m water depth), and the liquefaction depth is between 3.3 and 3.8 m under the action of waves with a significant wave height of 3.65 m, and the maximum liquefaction depth is reached in less than an hour and persists until the wave subsides.…”

mentioning

confidence: 99%

“…By field monitoring of liquefaction in the subaqueous Yellow River Delta, it is found that seabed liquefaction can happen to a depth ranging from tens of centimeters to several meters during a storm (Liu et al, 2020(Liu et al, , 2022Xu et al, 2021). Xu et al (2021) suggest that silty soil seabed liquefaction starts when the significant wave height reaches 0.5 m (for 8-m water depth), and the liquefaction depth is between 3.3 and 3.8 m under the action of waves with a significant wave height of 3.65 m, and the maximum liquefaction depth is reached in less than an hour and persists until the wave subsides. Several studies have found that the logistic regression model is a more appropriate method to assess the liquefaction potential under cyclic shear stress (Shen et al, 2016).…”

mentioning

confidence: 99%

See 3 more Smart Citations

Importance of Bed Liquefaction‐Induced Erosion During the Winter Wind Storm in the Yellow River Delta, China

Niu,

Xie,

Lin

et al. 2023

JGR Oceans

View full text Add to dashboard Cite

Data obtained during a 5‐month field observation of the Yellow River Delta show that the storm wave‐related oscillatory flows are mainly in an intermittently turbulent regime (400 < ReΔ < 1,200). Wave‐induced seabed liquefaction causes changes to the bed erodibility and increases the sediment entrainment rate, resulting in the formation of fluid mud layer (FML) during winter wind events. The strong NE winter winds lead to most of the wave‐induced liquefaction events in the study area. It was found the sediment erosion rate is underestimated when we solely focus on the wave‐induced bottom shear stress. To parameterize wave‐induced excess pore pressure buildup and sediment liquefaction, a series of experiments were conducted in a large wave flume and a new liquefaction‐erosion method is proposed to calculate the sediment erosion flux. Analysis of model results shows that the FML thickness is about 2–12 cm at the storm‐arrival stage during the entire observation period. The thickness of FML significantly increases with the increase of wave height and decrease of water depth. Once the FML is formed, strong currents can remove fluid mud 10 hr after the storm‐arrival stage, while the background currents on calm days can hardly cause suspension. The erosion rate in liquefaction zones can increase 5–10 times compared with the erosion rate in nonliquefaction conditions. The whole Bohai Sea is highly turbid after intense NE winter wind, and the liquefaction zones during winter winds would be the major sediment source. Enhanced sediment erosion can cause the subsequent degradation of the subaqueous Yellow River Delta.

show abstract

Section: Methodsmentioning

confidence: 71%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Importance of Bed Liquefaction‐Induced Erosion During the Winter Wind Storm in the Yellow River Delta, China

Niu,

Xie,

Lin

et al. 2023

JGR Oceans

View full text Add to dashboard Cite

show abstract

“…In our study site, predominately silty seabed with 8–9 m water depth is thought to be a liquefaction‐prone area (Du et al., 2021). A recent study has conducted field monitoring of pore water pressure near our observation points and noted that the seabed started to liquefy under waves with a significant wave height of 0.5 m and liquefaction depth could reach up to a few meters during extreme storm events (Xu et al., 2021). Considering the hydrodynamic conditions and soil properties, the combination of a high concentration suspended sediment layer and seabed soil strength weakening offers evidence of seabed liquefaction.…”

Section: Discussionmentioning

confidence: 97%

In‐Situ Observation of Storm‐Induced Wave‐Supported Fluid Mud Occurrence in the Subaqueous Yellow River Delta

Liu

et al. 2022

JGR Oceans

View full text Add to dashboard Cite

Two relatively comprehensive and long‐term observation campaigns of bottom sediment dynamics have been conducted at the subaqueous Yellow River delta in the winters of 2016 and 2018. High suspended sediment concentration (SSC) up to 10 g/L were observed in 2016 and active events of wave‐supported fluid mud (WSFM) were found to exist at the abandoned river delta during storms in 2018. A set of calibrated optical backscatter sensors measured the near‐bed SSC >30 g/L with a maximum WSFM thickness >60 cm. WSFMs emerging at the abandoned river delta were classified into three types: single‐peak, multi‐peak, and hybrid according to the time‐varying characteristics of WSFMs. The dominant factors triggering the WSFM generation and dissipation are storm‐wave actions and tidal effects, with limited contribution from current‐induced turbulence. In this study, several lines of evidence were put forward to prove the presence of seabed liquefaction to a depth of 10–16 cm, and thus we can infer that another significant factor enhancing the WSFM thickness scale may be wave‐induced liquefaction. Observations showed obvious signs of WSFM motion, or in other words, wave‐supported gravity flow (WSGF) moved downslope. The downslope velocity (around 1.9 cm/s) was estimated by solving a buoyancy‐friction force balance. This study observed frequent WSFM events at the abandoned Yellow River delta for the first time and demonstrates the need to attach more concerns about its roles in sediment transport and offshore engineering in the future.

show abstract

Storm Liquefaction Deposits: A Possibility of Time Reversal in Sedimentary Strata of an Estuarial Coastal Area

Xu,

Ren,

et al. 2024

J. Ocean Univ. China

View full text Add to dashboard Cite

Field observation of the wave-induced pore pressure response in a silty soil seabed

Cited by 19 publications

References 30 publications

Importance of Bed Liquefaction‐Induced Erosion During the Winter Wind Storm in the Yellow River Delta, China

Importance of Bed Liquefaction‐Induced Erosion During the Winter Wind Storm in the Yellow River Delta, China

In‐Situ Observation of Storm‐Induced Wave‐Supported Fluid Mud Occurrence in the Subaqueous Yellow River Delta

Storm Liquefaction Deposits: A Possibility of Time Reversal in Sedimentary Strata of an Estuarial Coastal Area

Contact Info

Product

Resources

About