A comparison study on the sediment flocculation process between a bare tidal flat and a clam aquaculture mudflat: The important role of sediment concentration and biological processes

Li, Jiasheng; Chen, Xindi; Townend, Ian; Shi, Benwei; Du, Jiabi; Gao, Jianhua; Chuai, Xiaowei; Gong, Zheng; Wang, Ya Ping

doi:10.1016/j.margeo.2021.106443

Cited by 12 publications

(6 citation statements)

References 86 publications

(157 reference statements)

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“…ECD can be defined as (Keyvani & Strom, 2014; Shen & Maa, 2016):

D=\sqrt{\frac{4{A}_{2\mathrm{D}}}{\pi }}

where A 2D is the two‐dimensional projected floc area captured from the image. The FSDs can often be represented as a characteristic value, and this value can be mean size (e.g., Guo et al., 2018; Li et al., 2021) or median size (e.g., Deng et al., 2019; Shen et al., 2018). In this study, the mean size is used when dealing with the experimental data, since the biomineral flocculation of kaolinite and microalgae may lead to bimodal FSDs, which are better characterized by mean size than median size.…”

Section: Methodsmentioning

confidence: 99%

Biomineral Flocculation of Kaolinite and Microalgae: Laboratory Experiments and Stochastic Modeling

et al. 2022

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The transportation of cohesive sediments has attracted great attention for decades due to the significant influences of sediments on various coastal and offshore engineering (e.g., siltation, dredging, seawall foundation treatment, and riverbed morphology) and environmental (e.g., pollutant transport, phytoplankton photosynthesis, and coastal wetland sustainability) issues (Coats et al., 1989;Edmonds & Slingerland, 2010;Sun et al., 2021;Teisson, 1991). It is a challenge to precisely predict the dynamic processes of cohesive sediments because they exist in the form of flocs (clusters) rather than single particles, which further controls the size and the settling velocity (

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“…ECD can be defined as (Keyvani & Strom, 2014; Shen & Maa, 2016):

D=\sqrt{\frac{4{A}_{2\mathrm{D}}}{\pi }}

Section: Methodsmentioning

confidence: 99%

Biomineral Flocculation of Kaolinite and Microalgae: Laboratory Experiments and Stochastic Modeling

et al. 2022

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“…the northern branch of the Yangtze River Estuary. Over a long stretch of the coast (approximately 1, 000 km), the accumulation of sediment from the ancient deltas of Yangtze River and Yellow River together contribute to the formation of tidal flats in this regime, forming a total land area of 32, 500 km 2 and marine area of more than 70, 000 km 2 (Zhang et al, 1999;Xu et al, 2016;Li et al, 2021). The well-known radial sand ridge system is located at the central zone of Jiangsu Coast, which supplies sediment in the coastal zone (Figure S1, also see Text S1.1 for the general hydrodynamic condition).…”

Section: Introductionmentioning

confidence: 99%

Biophysical contexture of coastal biofilm-sediments varies heterogeneously and seasonally at the centimeter scale across the bed-water interface

Chen

Kang²,

Zhang³

et al. 2023

Front. Mar. Sci.

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Coastal sediments filter and accumulate organic and inorganic materials from the terrestrial and marine environment, and thus provide a high diversity of microbial niches. However, sediment-based analyses typically examine bulk samples and seldom consider variation at a scale relevant to changes in environmental conditions, due to the lack of mid-long term field data which can cover both the seasonal and sediment depth variations. In this study, microbial production and bacterial community structure were determined together with grain parameters over 10 months of intertidal silty sands on Jiangsu Coast, China. We demonstrated that the microbiological effects did not merely present on the surface, but greatly varied and stratified in both physical and biological contexture within the top 4 cm layer. Bacterial community structure showed a clear vertical variation with higher operational taxonomic unit (OTU) numbers at 1~2 cm depth than in the top 2 mm, probably because of the decreasing disturbance by hydrodynamic forces. However, the microbial production rates and metabolic activities, represented by the production of extracellular polymeric substances (EPS), were always higher in the top. Seasonal changes were strongly reflected in the vertical patterns of EPS but could not explain the variation across sites. The overall EPS secretion in spring and summer was generally at high level than that in autumn and winter, with the maximum value of 5~6 times higher. Interestingly, the stratification of biological and physical properties followed a fixed relationship, where with the decrease of the grain size D50, the EPS content increased exponentially, and this relationship was independent of temporal or spatial variation. Despite the significant seasonal variation of microbial activity and sedimentary grain size individually, the basic function between EPS content and D50 however did not alter. Filling these knowledge gaps will not only help to decipher the fate of grain-biofilm aggregates and organic matter burial under global changes, but also provide field evidence for the development of sediment transport models as well as blue carbon models incorporating microbial processes.

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“…With the development of aquaculture and coastal economies, attention has been paid to the impacts of marine animals on erosion and deposition in tidal flats (e.g. Meretrix meretrix (Li et al, 2020) and clam (Li et al, 2021)), impacts of human activities on tidal flats (Lu et al, 2013;Gao et al, 2019), and tidal flat ecosystems during extreme weather conditions (Chen et al, 2012;Shi et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamics in the tidal flat in semi-enclosed Xiangshan Bay

Kong

et al. 2023

Front. Mar. Sci.

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Tidal flats provide a foundation for biological diversity and marine economy. Xiangshan Bay is a semi-enclosed bay that shelters large areas of tidal flats, and is known for its aquaculture. In this study, field trips were conducted in late autumn to measure the water level, current, water temperature, tidal flat temperature, and turbidity data of the tidal flat in the bay during Typhoon Lingling. The field data were well calibrated and used to investigate the hydrodynamics, temperature, and turbidity of the tidal flat. The results showed that the spring-neap tidal cycles at the sea surface level were well captured at both stations. The maximum tidal range was 5.5 m and 1.5 m during spring and neap tides, respectively. The tidal flat was occasionally exposed to air occasionally (30 min). The current velocity (<0.2 m/s) and waves (<0.15 m) at the field stations were weak, and the direction of flow was controlled by the geomorphology, even during Typhoon Lingling. Water was more turbid at station S2 (<0.8 kg/m3) than at station S1 (<0.2 kg/m3). The sea water temperature and tidal flat temperature were affected by tidal cycles, with larger variations occurring during spring tides than during neap tides. The maximum value of seawater temperature at S1 station was greater than that at station S2 during spring tides. The intrinsic mode functions (IMFs) of sea water temperature and surface tidal flat temperature were similar, as they are both subject to sea-air-tidal flat interactions. The IMFs of the middle and bottom layers in the tidal flat were less correlated. Temperature fluctuations in seawater and tidal flats were mainly affected by air temperature and tides. Small-scale features (>0.5 Hz) were important for water and tidal flat temperatures, particularly during typhoons. These findings provide field data for future studies on eco-hydrology and coastal engineering in tidal flats.

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A comparison study on the sediment flocculation process between a bare tidal flat and a clam aquaculture mudflat: The important role of sediment concentration and biological processes

Cited by 12 publications

References 86 publications

Biomineral Flocculation of Kaolinite and Microalgae: Laboratory Experiments and Stochastic Modeling

Biomineral Flocculation of Kaolinite and Microalgae: Laboratory Experiments and Stochastic Modeling

Biophysical contexture of coastal biofilm-sediments varies heterogeneously and seasonally at the centimeter scale across the bed-water interface

Hydrodynamics in the tidal flat in semi-enclosed Xiangshan Bay

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