Improvements of a Process-Based Model for 2- and 3-Dimensional Simulation of Flow in Presence of Various Obstructions DOI
Florian Ganthy,

Verney Romaric,

Franck Dumas

et al.

Published: Jan. 1, 2024

In coastal areas, various types of biological and anthropic structures significantly influence the flow related sediment dynamics. this paper we have developed a generic flow-obstruction module, designed to represent both upward or downward, rigid flexible structures, using limited number parameters. This module can be integrated any hydrodynamic model. The obstruction/flow interactions operate either in 3D 2D mode. It calculates source terms used momentum equation k-e turbulent closure model (exclusive mode). Additionally, allows for incorporation multiple obstructions within single mesh, which is invaluable when modelling realistic ecosystem module's validation was carried out flume experiments on seagrasses, as well numerical studies involving two anthropogenic structures: mussel long-lines oyster tables. coupled hydrodynamic/obstruction yielded excellent results 2D/3D velocity fields with minimal calibration efforts. offers potential explore future trajectories vulnerable systems response global change, identify restoration measures engineered systems.

Language: Английский

Feedback between sediment and light for seagrass: Where is it important? DOI Open Access
Matthew Adams, Renae Hovey, Matthew R. Hipsey

et al.

Limnology and Oceanography, Journal Year: 2016, Volume and Issue: 61(6), P. 1937 - 1955

Published: June 24, 2016

A feedback between seagrass presence, suspended sediment and benthic light can induce bistability two ecosystem states: one where the presence of reduces concentrations to increase availability thereby favoring growth, another absence increases turbidity reducing growth. This literature review identifies (1) how environmental meadow characteristics influence strength direction (stabilizing or destabilizing) seagrass-sediment-light feedback, (2) this has been incorporated in models proposed support decision making. Large, dense meadows shallow subtidal, non-eutrophic systems, growing sediments mixed grain size subject higher velocity flows, have greatest potential generate via feedback. Conversely, low density, area height enhance turbulent flows that interact with seabed, causing water clarity decline. Using a published field experiment as case study, we show only if sufficient attenuation properties. The considered very few models. These identify areas occurs, which is information assist spatial prioritization conservation restoration efforts. In present predicted, recovery may be difficult once lost. bare predicted (without bistability) better targets for than predicted.

Language: Английский

Citations

105
What-if nature-based storm buffers on mitigating coastal erosion DOI Creative Commons
Wei Chen, Joanna Staneva, Benjamin G. Jacob

et al.

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 928, P. 172247 - 172247

Published: April 9, 2024

Creating ecosystem buffers in intertidal zones, such as seagrass meadows, has gained increasing attention a nature-based solution for mitigating storm-driven coastal erosion. This study presents what-if scenarios using an integrated model framework to determine the effectiveness and strategies planting reduce The comprises two levels of simulation packages. first level is regional-scale coupled hydrodynamic that simulates processes specific storm provides boundary forces morphodynamic XBeach apply at next level, which nearshore morphological evolution. applied open coast Norderney German Bight North Sea. We demonstrate optimising location size meadows crucial increase efficiency onshore sediment erosion mitigation. For depth range, depending on storm's intensity, most significant reduction may not be achieved by starting meadow permits largest size. To maintain protection effect, density stem height should considered together, ensuring least 80 % compared unprotected coast. valuable insights design implementation transplantation solution, highlighting importance considering location, size, density, when protection.

Language: Английский

Citations

9
Why and How Do We Study Sediment Transport? Focus on Coastal Zones and Ongoing Methods DOI Open Access
Sylvain Ouillon

Water, Journal Year: 2018, Volume and Issue: 10(4), P. 390 - 390

Published: March 27, 2018

Scientific research on sediment dynamics in the coastal zone and along littoral has evolved considerably over last four decades. It benefits from a technological revolution that provides community with cheaper or free tools for situ study (e.g., sensors, gliders), remote sensing (satellite data, video cameras, drones) modelling (open source models). These changes favour transfer of developed methods to monitoring management services. On other hand, scientific is increasingly targeted by public authorities towards finalized studies relation societal issues. Shoreline vulnerability an object concern grows after each marine submersion intense erosion event. Thus, during decades, production knowledge considerably, tune needs society. This editorial aims at synthesizing current related hydrosedimentary dynamics, putting into perspective connections between coasts geomorphological entities concerned transport, showing links many fragmented approaches topic, introducing papers published special issue Water “Sediment transport waters”.

Language: Английский

Citations

81
Characterizing natural riparian vegetation for modeling of flow and suspended sediment transport DOI
Kaisa Västilä, Juha Järvelä

Journal of Soils and Sediments, Journal Year: 2017, Volume and Issue: 18(10), P. 3114 - 3130

Published: July 18, 2017

Language: Английский

Citations

71
Canopy Accumulation: Are Seagrass Meadows a Sink of Microplastics? DOI Creative Commons
Richard K. F. Unsworth,

A. J. Higgs,

Bettina Walter

et al.

Oceans, Journal Year: 2021, Volume and Issue: 2(1), P. 162 - 178

Published: Feb. 12, 2021

A growing body of research is documenting the accumulation microplastics within marine sediments around world. The hydrodynamic influences seagrasses in coastal environments are shown to increase sedimentation finer particles and as a result there has been speculation that this attribute will lead seagrass meadows acting site elevated microplastic contamination. To date range localised studies have provided conflicting answers hypothesis. Seagrass provide multiple ecosystem services including vital support roles for fisheries; therefore, considerable human health implications understanding their role sinks microplastics. This investigated abundance diversity present temperate North Atlantic meadow relative unvegetated examined how they correlate with structure sediment type. We also placed data context current knowledge through global meta-analysis published data. Eight adjacent sites UK were sampled test sediment. Microplastics found 98% samples, fibres making up 91.8% all identified. Abundance was recorded overall be 215 ± 163 (MP) kg−1 Dry Weight (DW) 221 236 MP DW habitats. There no significant differences between number respect vegetation. report evidence almost ubiquitous contamination both globally but find reflects general build-up wider environment rather than becoming concentrated an enhanced sink. Microplastic build hypothesised local hydrodynamics plastic sources habitat level concentration. Although not higher seagrass, such cause concern given high dependency many species fish on these types potential plastics move food chain.

Language: Английский

Citations

43
A Digital Twin modelling framework for the assessment of seagrass Nature Based Solutions against storm surges DOI Creative Commons

Umesh Pranavam Ayyappan Pillai,

Nadia Pinardi, Jacopo Alessandri

et al.

The Science of The Total Environment, Journal Year: 2022, Volume and Issue: 847, P. 157603 - 157603

Published: July 25, 2022

In this paper we demonstrate a novel framework for assessing nature-based solutions (NBSs) in coastal zones using new suite of numerical models that provide virtual "replica" the natural environment. We design experiments use Digital Twin strategy to establish wave, sea level and current attenuation due seagrass NBSs. This modelling allows us answer "what if" scenario questions such as: (i) are indigenous meadows able reduce energy storm surges, if so how? (ii) what best types their landscaping optimal wave attenuation? An important result study is show seagrasses an choice does not directly attenuate but amplitudes. reveals link between NBS components disruptive potential surges (waves level) opens up avenues future studies.

Language: Английский

Citations

37
Spatial distribution of anthropogenic particles and microplastics in a meso-tidal lagoon (Arcachon Bay, France): A multi-compartment approach DOI Creative Commons
Charlotte Lefebvre, Florane Le Bihanic, Isabel Jalón‐Rojas

et al.

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 898, P. 165460 - 165460

Published: July 16, 2023

Language: Английский

Citations

13
Are flow-vegetation interactions well represented by mimics? A case study of mangrove pneumatophores DOI
Erik Horstman, Karin R. Bryan, Julia C. Mullarney

et al.

Advances in Water Resources, Journal Year: 2017, Volume and Issue: 111, P. 360 - 371

Published: Dec. 2, 2017

Language: Английский

Citations

41
Hydrodynamics across seagrass meadows and its impacts on Indonesian coastal ecosystems: A review DOI Creative Commons
Johan Risandi, Husen Rifai, Kevin Muhamad Lukman

et al.

Frontiers in Earth Science, Journal Year: 2023, Volume and Issue: 11

Published: Feb. 9, 2023

Seagrass canopies are important components of the world’s coastal environments providing critical ecological services. Nearshore hydrodynamics, i.e., waves and currents, essential in controlling processes across environments. meadows can impose more complex hydrodynamics by attenuating sea-swell decreasing impact nearshore mean water level rise due to wave setup Infragravity (IG) waves. Consequently, seagrasses dissipate reduce flows allowing sediments settle accrete shorelines. However, despite their significant roles, knowledge Indonesian seagrass ecosystems is relatively limited compared other such as sandy beaches, mangroves, coral reefs. This review highlights dynamics interaction with sediment transport processes, including biogeochemical dispersal on ecosystem contributing existing research Indonesia. The associated literature collected from scientific databases Scopus Google Scholar that range between 1965 2021. result showed most hydrodynamic was carried out temperate zones. Until recently, there have been publications discussing (tropical) parameters, even though region has abundant species. Moreover, Indonesia strongly influenced various atmospheric-oceanic forcing, Asian monsoon affecting dynamic area ecosystems. At a canopy scale, correlation system yet be explored. Considering potential benefit ecosystems, developing future overcoming gaps gained could support services resilience hazards climate change.

Language: Английский

Citations

12
Spectral Wave Energy Dissipation by a Seagrass Meadow DOI Creative Commons
Nery Contti Neto, Ryan Lowe, Marco Ghisalberti

et al.

Journal of Geophysical Research Oceans, Journal Year: 2025, Volume and Issue: 130(3)

Published: March 1, 2025

Abstract Existing formulations for predicting wave dissipation by submerged canopies generally fall into three categories where (a) an empirical coefficient (energy factor) is attributed to the canopy ignoring its physical properties; (b) estimates of drag forces based on a bulk and undisturbed velocities above are used estimate dissipation; (c) flow theory account how modifications in‐canopy flows influence associated dissipation. We measured rates spectral across dense seagrass meadow comprised Posidonia australis in southwestern Australia, which also included high‐resolution measurements within canopy. These observations were quantify effectiveness different approaches predict observed The results showed that conventional do not and/or flexibility tend overestimate both frequency‐dependent Conversely, consider attenuation found improve predictions dissipation, particularly when accounting deflection flexible blades induced modifies effective height. show short period wind waves less attenuated than longer swell, explaining frequency dependency with shorter heights being more efficiently meadow.

Language: Английский

Citations

0