Modelling of cohesive sediment dynamics in tidal estuarine systems: Case study of Tagus estuary, Portugal

Franz, Guilherme; Pinto, Lı́gia; Ascione, Isabella; Mateus, Marcos; Fernandes, Rodrigo; Leitão, Paulo C.; Neves, Ramiro

doi:10.1016/j.ecss.2014.09.017

Cited by 38 publications

(18 citation statements)

References 30 publications

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“…This process is one of the main mechanisms behind the nutrient availability in the mixed layer, controlling phytoplankton growth. The downscaling approach was previously applied in the Tagus estuary (Portugal) to study cohesive sediment dynamics (FRANZ et al, 2014a) and for operational modelling of hydrodynamics and water quality (FRANZ et al, 2014b). From the point of view of an operational forecast system, a downscaling from regional to local models has proven successful (e.g.…”

Section: Introductionmentioning

confidence: 99%

From regional to local scale modelling on the south-eastern Brazilian shelf: case study of Paranaguá estuarine system

et al. 2016

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The applicability of a numerical model following a downscaling methodology was evaluated for the south-eastern Brazilian shelf (regional model) and Paranaguá estuarine system (local model). This approach permits the simulation of different scale processes, such as storm surges and coastal upwelling, and is suitable for operational forecasting purposes. When large areas are covered by regional models, the tidal propagation inside the domain can be significantly affected by the local tidal potential, mainly where the resonance phenomenon is observed. The south-eastern Brazilian shelf is known for the resonance of the third-diurnal principal lunar tidal constituent (M3), the largest amplitudes being found in the Paranaguá estuarine system. Therefore, the significance of the local tidal potential was assessed in this study for the most important tidal constituents inside the estuarine system (including M3). The model validation was performed with tidal gauge data, Argo float profiles and satellite measurements of Sea Surface Temperature. The methodology described in this study can be replicated for other important estuarine systems located on the south-eastern Brazilian shelf. Furthermore, the numerical model was developed within a perspective of operational nowcast/forecast simulations, useful for several activities such as navigation and response to emergencies (e.g., oil spills). Abstract Descriptors:Numerical modelling, Tidal propagation, Resonance phenomenon, Downscaling, South-eastern Brazilian shelf, Paranaguá estuarine system. A aplicabilidade de um modelo numérico seguindo uma metodologia de downscaling foi avaliada para a plataforma sudeste brasileira (modelo regional) e o sistema estuarino de Paranaguá (modelo local). Esta abordagem permite simular fenômenos de escalas diferentes, como maré meteorológica e ressurgência costeira, e é apropriada para fins de previsão operacional. Quando grandes áreas são cobertas por modelos regionais, a propagação da maré no interior do domínio pode ser afetada significativamente pelo potencial local da maré, principalmente onde o fenômeno de ressonância é observado. A plataforma sudeste brasileira é conhecida pela ressonância da constituinte da maré lunar principal terci-diurna (M3), com as maiores amplitudes encontradas no sistema estuarino de Paranaguá. Por este motivo, a significância do potencial local da maré foi verificada neste estudo para as constituintes da maré mais importantes dentro do sistema estuarino (incluindo a M3). A validação do modelo foi realizada com dados de marégrafos, perfis de boias Argo e medições de satélite da temperatura da superfície do mar. A metodologia descrita neste estudo pode ser replicada para outros sistemas estuarinos importantes localizados na plataforma sudeste brasileira. Além disso, o modelo numérico foi desenvolvido na perspectiva de simulações operacionais em nowcast/ forecast, úteis para diversas atividades, como navegação e resposta a emergências (e.g., derrames de petróleo). ResumoDescritores: Modelagem numérica, Propagaçã...

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Section: Introductionmentioning

confidence: 99%

From regional to local scale modelling on the south-eastern Brazilian shelf: case study of Paranaguá estuarine system

et al. 2016

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“…Sediment dynamic in the Tagus estuary was also revisited using numerical models. In a novel modeling approach that uses an upgraded version of the MOHID, a three-nested hydrodynamic one-way modeling approach with a detailed model for cohesive sediment dynamics was combined [78]. This application that relied on a previous validation of the hydrodynamic results by harmonic analysis and with acoustic doppler current profiler (ADCP) data, illustrated the relevance of wind and waves on cohesive sediment erosion, besides the well know role of tidal currents.…”

Section: The 2010smentioning

confidence: 99%

The Tagus Estuary as a Numerical Modeling Test Bed: A Review

et al. 2019

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The Tagus Estuary is the largest estuarine system in the Iberian Peninsula. Located in a heavily populated metropolitan area (Lisbon), the estuary-coastal continuum is subject to significant natural variability (e.g., tidal variations, winds, river inflow, etc.) and human pressures (e.g., sewage outflow, infrastructures, coastal reclamation, dredging, etc.). Since the 1980s, the estuary has been a natural laboratory for a great number of multidisciplinary studies, but also a numerical laboratory to test models and to develop new ideas and numerical methodologies. Hydrodynamic and biogeochemical models have been used ever since to ascertain the main spatial and temporal features of the Tagus system, connecting its dynamic to its biogeochemical cycles, providing numerical tools used to increase knowledge and to manage the estuary and nearby coastal waters. The main objective of this paper is to present a synopsis of the scientific output related to numerical studies in the Tagus system, by reviewing more than fifty papers published over the past four decades. Our work provides a historical background and description of the numerical models implemented to address estuarine hydrodynamics, nutrient uptake, primary production, light availability, seasonal and annual cycles and the link between physical, biological and chemical estuarine oceanography.

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“…Xue et al (2012) mengemukakan penyebab utama transpor dan deposit sedimen yang membentuk delta pada muara Sungai Mekong (sungai terbesar di Asia Tenggara) adalah pasang surut, arus dan gelombang. Kejadian lain juga menunjukkan secara spesifik penyebab utama erosi sedimen kohesif di Estuari Tagus (Portugal) oleh dinamika arus pasang surut dan gelombang (Franz et al, 2014).…”

Section: Pendahuluanunclassified

“…Namun besaran arus pasut hasil model sedikit lebih kecil jika dibandingkan dengan hasil pengukuran. Hal ini mungkin disebab-kan oleh kisaran kondisi awal (initial con-dition) yang dimasukan ke dalam model cukup mempengaruhi besaran hasil model tersebut (Cho et al, 2012;Franz et al, 2014). …”

Section: Verifikasi Modelunclassified

Cohesive Sediment Transport Modeling on Inner Ambon Bay

Noya

Purba²,

Koropitan³

et al. 2017

J. Ilmu dan Teknologi Kelautan Tropis

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The presence of cohesive sediment in the water column can reduce light penetration and affect photosynthesis process, and it can be disrupted the primary productivity of aquatic, and sedimentation of coastal waters. The objective of this research was to determine the cohesive sediment distribution pattern and the relationship with sedimentation. MIKE 3 FM modeling was used to understand the process of sediment transport and sedimentation on Inner Ambon Bay. Sediment transport modeling method was divided into two stages: the hydrodynamic modeling (baroclinic) and sediment transport (mud transport) modeling. The model results indicate current patterns in the Inner Ambon Bay is influenced by the tidal factor. Suspended sediment dispersed vertically from the surface to a depth of 30 m with concentration of about 3.5-15 Kg/m3. The maximum consentration of the suspended sediment occurs at head of the bay (around Waiheru, Passo, and Lateri). Model simulations for 30 days showed the rate of erosion is about 1.04-6.15 Kg/m2/s, while in Inner Ambon Bay the erosion about 9.07x10-8Kg/m2/s only occurred in T1 station. Sedimentation associated with the cohesive sediment accumulation and it was shown by bed level. In addition, the simulation showed bed level in sill ranged at 0.01-0.19 cm and 0.47 mm/day on average, while in the Inner Ambon Bay it ranged from 1.75-10.01 cm, and the sedimentation rate was approximately 39.9 mm/day.

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Modelling of cohesive sediment dynamics in tidal estuarine systems: Case study of Tagus estuary, Portugal

Cited by 38 publications

References 30 publications

From regional to local scale modelling on the south-eastern Brazilian shelf: case study of Paranaguá estuarine system

From regional to local scale modelling on the south-eastern Brazilian shelf: case study of Paranaguá estuarine system

The Tagus Estuary as a Numerical Modeling Test Bed: A Review

Cohesive Sediment Transport Modeling on Inner Ambon Bay

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