The Interplay between Flow Field, Suspended Sediment Concentration, and Net Deposition in a Channel with Flexible Bank Vegetation

Water, Journal Year: 2019, Volume and Issue: 11(11), P. 2250 - 2250

Published: Oct. 27, 2019

This paper investigates the interplay between flow, suspended sediment concentration (SSC), and net deposition at lateral interface a main channel riverbank/floodplain vegetation consisting of emergent flexible woody plants with understory grasses. In new set flume experiments, data were collected concurrently on flow field, SSC, using acoustic Doppler velocimeters, optical turbidity sensors, weight-based sampling. Vegetation largely affected vertical SSC distributions, both within near vegetated areas. The seasonal variation properties was important, as foliage strongly increased mixing sediments unvegetated parts channel. Foliage reach-scale enhanced in grasses channel–vegetation interface. To estimate differences caused by foliation, we introduced drag ratio approach for describing difference parts. Findings this study suggest that future research engineering applications will benefit from more realistic description natural plant features, including reconfiguration foliage, to complement replace existing rigid cylinder approaches.

Language: Английский

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Assessment of marine debris in seagrass beds of Pramuka Island, Kepulauan Seribu

IOP Conference Series Earth and Environmental Science, Journal Year: 2022, Volume and Issue: 967(1), P. 012014 - 012014

Published: Jan. 1, 2022

Abstract Indonesia is referred as the second largest contributor of marine debris in world after China, with an estimated 0.48-1.29 million metric tons per year. High anthropogenic activities from locals and tourists can produce large impact seagrass ecosystem. This research aimed to identify habitat beds on Pramuka Island. Extensive surveys include observing community structures, measurement chemical physical parameters water, inventory at three stations Observation results found six species, coverage ranged 1.67-47.32% while density 28-112.76 stand/m 2 . Marine be classified into types: plastic, metal, rubber, glass, organic matter, others. The weight for each type ranges 0.03–2.38 kg. In addition, microplastic consisted fiber, film, fragment a unit 20–440 particles/kg. conclusion, conditions station are damaged. that has most plastic. Fiber abundance. this interfere respiration photosynthesis process seagrass.

Language: Английский

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Phytoplankton versus macrophyte contribution to primary production and biogeochemical cycles of a coastal mesotidal system. A modelling approach

Estuarine Coastal and Shelf Science, Journal Year: 2015, Volume and Issue: 165, P. 52 - 60

Published: Sept. 7, 2015

Language: Английский

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Understanding the seagrass‐sediment‐light feedback to guide restoration planning: a case study using Zostera muelleri

Restoration Ecology, Journal Year: 2023, Volume and Issue: 31(8)

Published: Oct. 24, 2023

Seagrass ecosystems are ecologically important but declining worldwide, prompting restoration efforts. However, success is partially reliant on ensuring that donor material and planting methods suitable under the environmental conditions expected within sites. This may require at critical densities needed to initiate favorable feedbacks, plants pre‐adapted local conditions, setting realistic goals. An understanding of relationship between (e.g. light environment seagrass structural complexity) can be particularly in guiding decision‐making. Here, we investigate how sediment‐light interact with complexity (density above‐ground morphology) guide approaches for intertidal Zostera muelleri . Using generalized additive models empirical data, identified significant relationships Z. meadows present Western Port, Victoria, southeast Australia. We found a decrease shoot density leaf length decreasing availability, potentially reflective an adaptive change species morphology response low‐light environments. also sediment sorting increased fine particles increasing meadow complexity, suggesting increases stability, accretion, contribute water clarity via ecological feedbacks. These findings suggest both drivers potential feedbacks occur before large‐scale begins targets should reflect form most likely present.

Language: Английский

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

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

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