Hybrid Shoreline Modelling of Shoreline Protection Schemes, Palm Beach, Queensland, Australia

Kærgaard, Kasper; Mortensen, Simon; Kristensen, Sten Esbjørn; Deigaard, Rolf; Teasdale, Rupert; Hunt, Shannon

doi:10.9753/icce.v34.sediment.23

Cited by 6 publications

(3 citation statements)

References 3 publications

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“…Morphological evolution is however constrained by forcing the bed update in the model in terms of seaward or landward movement of the shoreline in response to accretion or erosion as described in (KAERGAARD & FREDSOE 2013;KRISTENSEN et al, 2010). Previous application of the model includes determination of shoreline response to breakwaters, (DRØNEN et al, 2011;KAERGAARD et al, 2014) and development due to mega nourishment, (KAERGAARD & DRØNEN, 2015). The morphological model is first setup to reproduce the overall sediment budget obtained by analysis of the bathymetric surveys carried out in 2000 and 2014.…”

Section: Methodsmentioning

confidence: 99%

Sustainable beach design for Raf Raf, Tunisia

Grunnet¹,

Kristensen²,

Kærgaard³

et al. 2015

Edition 3, Ferrare, Italie

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The beach at Raf Raf, Tunisia, has a high recreational use. Continuous erosion due to gradients in the littoral drift combined with urban developments placed close to the beach has reduced the beach width. In order to re-establish the wide beach, an extensive modelling study has been conducted by DHI by use of the new MIKE21 Shoreline Morphology FM model. The numerical study was used to investigate possible mitigation scenarios, which included beach nourishment and different types of stabilising structures. Finally an optimisation of the sand placement was undertaken in order to reduce costs of nourishment. The criteria for selecting the final mitigation scenario were largely based on longevity of the solution thus reducing the need for continuous maintenance. The new shoreline model proved to be a valuable tool for comparing different mitigation scenarios in a systematic manner. Based on the model results it was possible to select a mitigation scenario which best satisfies the Client's needs. The implementation of the new beach design is expected to be finished in 2016.

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Section: Methodsmentioning

confidence: 99%

Sustainable beach design for Raf Raf, Tunisia

Grunnet¹,

Kristensen²,

Kærgaard³

et al. 2015

Edition 3, Ferrare, Italie

Self Cite

View full text Add to dashboard Cite

show abstract

“…For the long-term estimation of the bed evolution the process-based numerical model MIKE 21 Coupled Model FM [19] was used for the detailed description of hydrodynamics, waves, and sediment transport rates. The model has been used extensively in a variety of coastal engineering applications, with and without the presence of coastal protection structures (e.g., [1,13,37,38]. The MIKE21 Coupled model FM suite includes several complementary numerical models and tools three of which were used for the purpose of this research:…”

Section: The Mike21 Coupled Model Fm Suitementioning

confidence: 99%

A Wave Input-Reduction Method Incorporating Initiation of Sediment Motion

Papadimitriou

Panagopoulos

Chondros

et al. 2020

JMSE

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The long-term prediction of morphological bed evolution has been of interest to engineers and scientists for many decades. Usually, process-based models are employed to simulate bed-level changes in the scale of years to decades. To compensate for the major computational effort required by these models, various acceleration techniques have been developed, namely input-reduction, model-reduction and behaviour-oriented modelling. The present paper presents a new input-reduction method to obtain representative wave conditions based on the Shields criterion of incipient motion and subsequent calculation of the sediment pick-up rate. Elimination of waves unable to initiate sediment movement leads to additional reduction of model run-times. The proposed method was implemented in the sandy coastline adjusted to the port of Rethymno, Greece, and validated against two datasets consisting of 7 and 20 and 365 days, respectively, using the model MIKE21 Coupled Model FM. The method was compared with a well-established method of wave schematization and evaluation of the model’s skill deemed the simulations based on the pick-up rate schematization method as “excellent”. Additionally, a model run-time reduction of about 50% was observed, rendering this input-reduction method a valuable tool for the medium to long-term modelling of bed evolution.

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“…The basic concept (Figure 21) and a detailed description of the MIKE21FM Shoreline model is in Kristensen et al [35,36] and Danish Hydraulic Institute [37]. This model consists of four models: a spectral wave model, a hydrodynamic model, a sand transport model, and a shoreline morphology model.…”

Section: Model Descriptionmentioning

confidence: 99%

Shoreline Change around a River Delta on the Cox’s Bazar Coast of Bangladesh

Mahamud

Takewaka

2018

JMSE

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A recent erosional problem around a river delta on the Cox's Bazar coast was analyzed in this study. The coastline extends from south to north. Rapid erosion has affected some portions of a 24-km road along the coast, and local authorities have attempted to protect the road via revetment. However, the structure was soon buried with sediment because of a growing sand spit along the river delta, and a new area was eroded. Shoreline positions for a 44-year (1972-2016) period were digitized using Landsat images. From the time stack images, we observed a sand spit growing in a northward direction from 2000 to 2015, and the adjacent erosion area extended in the same direction. We employed a numerical model (MIKE21FM SM) for the computation of wave-driven currents and sediment transport along the coast, and attempted to reproduce recent erosional processes. The numerical result shows that net littoral drift is dominant in the northward direction along the coast, which is the same direction of the spit growth observed in the satellite images. A higher amplitude spit induces higher sediment transport compared to a low amplitude spit because of the difference in local incident wave angles resulting in greater positive gradient of the longshore sediment flux distribution, causing erosion in the downcoast.

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Hybrid Shoreline Modelling of Shoreline Protection Schemes, Palm Beach, Queensland, Australia

Cited by 6 publications

References 3 publications

Sustainable beach design for Raf Raf, Tunisia

Sustainable beach design for Raf Raf, Tunisia

A Wave Input-Reduction Method Incorporating Initiation of Sediment Motion

Shoreline Change around a River Delta on the Cox’s Bazar Coast of Bangladesh

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