Small-scale benthic faunal activities may lead to large-scale morphological change- A model based assessment

Arlinghaus, Peter; Zhang, Wenyan; Schrum, Corinna

doi:10.3389/fmars.2022.1011760

Cited by 7 publications

(8 citation statements)

References 89 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this study, the exact grain size of each class is configured (Table 1) based on observations from Xia et al (2004) and Zhang et al (2019). The settling velocity and erosion rate for each class are obtained from Xia et al (2004) and Arlinghaus et al (2022). For the erosion rate and critical shear stress of each class, the general formula by Winterwerp et al (2012) are applied.…”

Section: Datamentioning

confidence: 99%

“…The frequency with which particles collide, grow, and break up is largely dependent on the intensity of turbulence (Malcherek, 1995;Maggi, 2005). To assess the effect of flocculation on the ETMs, we adopted the formulation (Equation 14) by Arlinghaus et al (2022), which links the settling velocity of cohesive sediment to turbulence:…”

Section: Effect Of Flocculation On Etmsmentioning

confidence: 99%

See 1 more Smart Citation

Physical mechanisms, dynamics and interconnections of multiple estuarine turbidity maximum in the Pearl River estuary

Ma,

Porz,

Schrum

et al. 2024

Front. Mar. Sci.

Self Cite

View full text Add to dashboard Cite

The formation and dynamics of individual estuarine turbidity maximum (ETM) in the Pearl River estuary (PRE) have been investigated but the temporal variability of the ETMs and interconnections among them remain poorly understood. To address these open questions, the distribution and transport of suspended particulate matter (SPM) in the PRE for the period of 2017–2020 are investigated by numerical modeling. The simulated sediment transport flux is decomposed into several major components associated with specific physical processes. Then, the relative contribution of each component to the formation of the ETMs is evaluated. Results suggest the coexistence of three prominent ETMs in the Lingding Bay of the PRE. They are formed by different physical mechanisms and characterized by remarkable seasonality in the spatial extension. In the two ETMs located at the west shoal and middle shoal, advection dominates the sediment transport flux, whilst tidal pumping plays a crucial role in maintaining the ETMs. A sharp bathymetric gradient leads to an entrapment of sediment flux within the bottom layer in the west channel ETM, a phenomenon referred to as topographical trapping. The interconnection analysis shows that the sediment transport between the ETMs varies with seasons, which is attributed to the variation of stratification driven by the monsoon-mediated river runoff. Our results provide new insights into the physical dynamics and interconnections of the ETMs in the PRE, which can serve as scientific base for estuarine sediment management and engineering.

show abstract

Section: Datamentioning

confidence: 99%

Section: Effect Of Flocculation On Etmsmentioning

confidence: 99%

Physical mechanisms, dynamics and interconnections of multiple estuarine turbidity maximum in the Pearl River estuary

Ma,

Porz,

Schrum

et al. 2024

Front. Mar. Sci.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Over the past three decades, increasing efforts have been dedicated to upscale the impacts of benthos-sediment interactions to larger scales through the use of numerical modeling (Arlinghaus et al, 2021). Results indicate that benthos can induce erosion that is in the same order of magnitude as hydrodynamics (Wood and Widdows, 2002;Lumborg et al, 2006;Arlinghaus et al, 2022) and causes redistribution of sediments at large spatial scales, e.g. 50 across tidal basins (Borsje et al, 2008) and coastal bays (Nasermoaddeli et al, 2017).…”

mentioning

confidence: 99%

“…many biophysical functions such as the formation of biofilm and its impact on sediment stability remain still poorly understood (Stal, 2010;65 Van Colen et al, 2010;Chen et al, 2017). Interactions between different functional groups of benthos and between benthos and seabed morphology are important in coastal morphodynamics (Murray et al, 2008;Marani et al, 2010;Corenblit et al, 2011;Reinhardt et al, 2010;Zarnetske et al, 2017) but have rarely been incorporated in large-scale modeling (Arlinghaus et al, 2022, Brückner et al, 2021. Shortage of continuous field monitoring data (e.g.…”

mentioning

confidence: 99%

Benthos as a key driver of morphological change in coastal regions

Arlinghaus

Schrum

Kröncke

et al. 2023

Preprint

View full text Add to dashboard Cite

Abstract. Benthos has long been recognized as an important factor influencing local sediment stability, deposition and erosion rates. However, its role in long-term (annual-to-decadal scale) and large-scale coastal morphological change remains largely speculative. This study aims to derive a quantitative understanding of the importance of benthos in the morphological development of a tidal embayment (Jade Bay), as representative for tidal coastal regions. To achieve this, we firstly applied a machine learning-aided species abundance model to derive a complete map of benthos (functional groups, abundance and biomass) in the study area, based on abundance and biomass measurements. The derived data were used to parameterize the benthos effect on sediment stability, erosion/deposition rates, and hydrodynamics in a 3-dimensional hydro-eco-morphodynamic model, which was then applied to the Jade Bay to hindcast morphological and sediment change for 2000–2009. Simulation results indicate significantly improved performance with benthos effect included. Results suggest that the model is able to reproduce the main pattern of morphological change only when benthos impact is included, whilst abiotic drivers (tides, storm surges) alone would lead to an opposite pattern. Based on comparison among scenarios with various combinations of abiotic and biotic factors, we further investigated the level of complexity of hydro-eco-morphodynamic models that is needed to capture long-term and large-scale coastal morphological development. The accuracy in parametrization data was crucial for increasing model complexity. When the parametrization uncertainties were high, increased model complexity decreased model performance.

show abstract

“…The interplay between organisms and landscape development is defined as biogeomorphology. Studying biogeomorphology is essential to understanding the dynamics of tidal flats and preserving their valuable ecosystem services (Arlinghaus et al, 2022;Corenblit et al, 2011).…”

Section: The Tidal Flat Ecosystem: Being Dynamic Is the Normal Statusmentioning

confidence: 99%

Benthic macrofauna under extremes

Zhou

View full text Add to dashboard Cite

Extreme weather events are increasing in intensity, duration, and frequency, and threatening tidal flat ecosystems due to global climate change. Benthic macrofauna plays essential roles in biogeomorphic feedback as ecosystem engineers, yet they are prone to extreme environmental fluctuations in storms and drying tidal regimes. Moreover, modern globalization has accelerated the invasion of introduced species, which compete with native species for natural resources. Therefore, studying how benthic macrofauna responds to climate-change-induced extreme weather events may convey an essential message on short-term equilibrium and the long-term development of tidal flat ecosystems. A mesocosm system was designed and customized in the lab to mimic the heatwaves with contrasting magnitudes and durations on tidal flats. Simulated heatwaves were imposed on the model bioturbator species Cerastoderma edule living in different micro-topographies and sediment types, to study the response of bioturbation activities under thermal stress (Chapters 2 & 3). Besides individual-level response, an in-situ experiment was applied to study the effects of repeated storm events on benthic community structure, using a raking treatment to mimic storm-induced sediment disturbance (Chapter 4). Moreover, the effects of compound extreme weather events on species shift were studied by imposing different salinity settings and heatwave profiles on the native C. edule and an introduced bivalve Ruditapes philippinarum (Chapters 5). Macrobenthos' response on the individual level is categorized into the “fight, flight, or freeze” framework. Bioturbators increase metabolic rates to “fight” against the thermal stress and maintain optimal physiological conditions (Chapters 2); they burrowed deeper during low tide to escape from (“flight”) the thermal stress, thereby causing more sediment mixings (Chapters 2 & 3); they reduce activity and metabolism (“freeze”) to maintain basic physiological functions under acute extreme stress or long-term intermediate stress (Chapter 5). On the community level, internal environmental stress can select species with specific biological traits, while species with unfitting traits decrease in abundance (Chapter 4). Moreover, compound extreme weather events may create “disturbance-driven establishing windows” that benefit the introduced species to overtake native species (Chapter 5).

show abstract

Small-scale benthic faunal activities may lead to large-scale morphological change- A model based assessment

Cited by 7 publications

References 89 publications

Physical mechanisms, dynamics and interconnections of multiple estuarine turbidity maximum in the Pearl River estuary

Physical mechanisms, dynamics and interconnections of multiple estuarine turbidity maximum in the Pearl River estuary

Benthos as a key driver of morphological change in coastal regions

Benthic macrofauna under extremes

Contact Info

Product

Resources

About