Sediment Disposals in Estuarine Channels Alter the Eco‐Morphology of Intertidal Flats

Vet, P.L.M. de; Prooijen, Bram C. van; Colosimo, I.; Ysebaert, Tom; Herman, Peter M. J.; Wang, Zheng Bing

doi:10.1029/2019jf005432

Cited by 13 publications

(12 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Hybrid approaches, including engineering interventions, such as wave attenuation structures that either reduce tree damage or support seedling establishment, could be considered to ameliorate (changing) environmental conditions to below-threshold values, thereby enhancing mangrove functionality and persistence. Examples of such interventions could be permeable dams (Winterwerp et al, 2020), sediment nourishments (Baptist et al, 2019;de Vet et al, 2020), artificial reefs, rock fillets (Morris et al, 2020), or adjustable dams (Sadat-Noori et al, 2021) (Figure 7A).…”

Section: Long-term Mangrove Persistence: Adaptive Managementmentioning

confidence: 99%

Nature-Based Engineering: A Review on Reducing Coastal Flood Risk With Mangroves

et al. 2021

View full text Add to dashboard Cite

Integration of mangroves in projects to reduce coastal flood risk is increasingly being recognised as a sustainable and cost-effective alternative. In addition to the construction of conventional hard flood protection infrastructure, mangroves not only contribute to attenuating flood events (functionality), they also recover in, and adapt to, a changing climate (persistence). The implementation of mangroves in flood risk reduction, however, remains complex. This is because the innate functionality and persistence of mangroves depend on a range of environmental conditions. Importantly, mangroves may collapse when environmental impacts or climatic changes exceed key system thresholds, bringing uncertainty into a situation where failure could endanger lives and livelihoods. The uncertainties in mangrove functionality and persistence can be dealt with by (1) improving insights in how ecological and physical processes affect mangrove functionality and persistence across scales, (2) advancing tools to accurately assess and predict mangrove functionality and persistence, and (3) adopting an adaptive management approach combined with appropriate engineering interventions to enhance mangrove functionality and persistence. Here, we review existing evidence, monitoring techniques and modelling approaches from the viewpoint of mangrove functionality and persistence. Inspired by existing guidelines for Nature-based Solutions (NbS) to reduce flood risk, we provide an operationalization for this new approach. In addition, we identify where further research efforts are required for the practical application of mangroves in coastal flood risk management. Key aspects in the variability and uncertainty of the functionality and persistence of mangroves are their failure and recovery mechanisms, which are greatly site- and storm-specific. We propose five characteristic damage regimes that result in increasing reductions of mangrove functionality as well as post-storm recovery periods. Further research on the quantification of these regimes and their thresholds is required for the successful integration of mangroves in coastal flood risk management. Ultimately, the key challenge is the development of adaptive management strategies to optimise long-term mangrove functionality and persistence, or their resilience. Such adaptive strategies should be informed by continued mangrove functionality and persistence assessments, based on continued monitoring and modelling of key mangrove thresholds, and supported through well-established guidelines.

show abstract

Section: Long-term Mangrove Persistence: Adaptive Managementmentioning

confidence: 99%

Nature-Based Engineering: A Review on Reducing Coastal Flood Risk With Mangroves

et al. 2021

View full text Add to dashboard Cite

show abstract

“…This implies that for constant wind conditions, the flow velocity u TW at zero tidal flow is equal to the wind-driven flowû required to reverse the tidal flow. The circular-like shape of the ebb curves when wind blows in flood direction, and for the flood curves when wind blows in ebb direction, results from Equation (12) getting the form of a circumference equation: x 2 + y 2 = r 2 . For u 10 > 0 the circular-like shape exists for u T < 0, i.e., during ebb; and for u 10 < 0 the circular-like shape exists for u T > 0, i.e., during flood.…”

Section: Tide-wind Interaction Modelmentioning

confidence: 99%

“…In order to asses the model's applicability to other locations and environments, the assumptions made are discussed hereafter. Firstly, the model is based on Equation (12) in which we neglected the contribution by the residuals in the MBE, and especially the component related to the wind-induced pressure gradient. The model does include the barotropic pressure gradient related to the tide.…”

Section: Effect Of Wind On Tide-averaged Flow: Model and Data Comparisonmentioning

confidence: 99%

“…Recent studies, e.g., [9][10][11], show that dredged material can be re-used to feed tidal flats and promote salt marshes restoration. The disposal in estuarine channels can have long-term effects (order of years or decades) on the tidal flats and salt marshes morphodynamics [12]. A detailed understanding of the hydrodynamic and sediment transport mechanisms in intertidal areas is key to predicting their morphological evolution.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The Impact of Wind on Flow and Sediment Transport over Intertidal Flats

Colosimo

Vet

Maren

et al. 2020

JMSE

Self Cite

View full text Add to dashboard Cite

Sediment transport over intertidal flats is driven by a combination of waves, tides, and wind-driven flow. In this study we aimed at identifying and quantifying the interactions between these processes. A five week long dataset consisting of flow velocities, waves, water depths, suspended sediment concentrations, and bed level changes was collected at two locations across a tidal flat in the Wadden Sea (The Netherlands). A momentum balance was evaluated, based on field data, for windy and non-windy conditions. The results show that wind speed and direction have large impacts on the net flow, and that even moderate wind can reverse the tidal flow. A simple analytical tide–wind interaction model shows that the wind-induced reversal can be predicted as a function of tidal flow amplitude and wind forcing. Asymmetries in sediment transport are not only related to the tide–wind interaction, but also to the intratidal asymmetries in sediment concentration. These asymmetries are influenced by wind-induced circulation interacting with the large scale topography. An analysis of the shear stresses induced by waves and currents revealed the relative contributions of local processes (resuspension) and large-scale processes (advection) at different tidal flat elevations.

show abstract

“…According to Foster and Meyer [12], erosion is the cause of sedimentation caused by water, especially covering the process of detachment, transportation, and deposition of soil particles that occur due to collisions of rainwater and water flow. Sediment is preferably retained within these systems, as extraction would weaken their resilience to sea-level rise [13].…”

Section: Introductionmentioning

confidence: 99%

Sedimentation Management Strategy in River Estuary for Control the Water Damage in Downstream of Ayung River

Eryani

Nurhamidah

2020

Int. J. Adv. Sci. Eng. Inf. Technol.

View full text Add to dashboard Cite

The Ayung River Basin is the largest watershed on Bali Island. Ayung River flows from Lake Batur and empties into Padanggalak beach. River estuary is an area of sediment material deposition that will form an alluvial formation. The deposition of sediment at the river estuary is due to the influence of river flow, tidal, and wave action on the beach. Sediments that settle at the river estuary can obstruct water flow to the sea, which can cause backwater and flooding to the mainland. The strategy of controlling sediment deposition in the river estuary is essential to reduce the water damage in the downstream area, which is usually used as a tourism area. Ayung River Estuary is one of the estuaries that experienced a massive deposition; on the other hand, the Ayung River Estuary is widely used as a tourism area. The data used are primary and secondary-primary data obtained by a survey to the location and secondary data obtained from supporting data for analysis. Sedimentation occurs in the Ayung river estuary. It is due to soil type, topography, and hydro oceanographic condition. Besides, changes in the regional functions, such as temple construction, also affect the sedimentation process in the estuary. Sedimentation management strategies that can be carried out for the Ayung River estuary are the first is with the jetty construction method, which begins with the normalization of the downstream river, and the second is maintenance dredging, which is carried out through cooperation between the government and the community. Besides being used as sediment control, the jetty that was built can be developed as a tourist location around the estuary area.

show abstract

Sediment Disposals in Estuarine Channels Alter the Eco‐Morphology of Intertidal Flats

Cited by 13 publications

References 36 publications

Nature-Based Engineering: A Review on Reducing Coastal Flood Risk With Mangroves

Nature-Based Engineering: A Review on Reducing Coastal Flood Risk With Mangroves

The Impact of Wind on Flow and Sediment Transport over Intertidal Flats

Sedimentation Management Strategy in River Estuary for Control the Water Damage in Downstream of Ayung River

Contact Info

Product

Resources

About