On formulating anon-linear numerical model in three dimensions for tides and storm surges

2008 ◽  
pp. 368-387 ◽  
Author(s):  
N. S. Heaps
Keyword(s):  
Numerical Model ◽  
Storm Surges ◽  
Three Dimensions

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

2016 ◽  
Vol 64 (3) ◽  
pp. 277-294 ◽  
Author(s):  
Guilherme Augusto Stefanelo Franz ◽  
Paulo Leitão ◽  
Aires dos Santos ◽  
Manuela Juliano ◽  
Ramiro Neves
Keyword(s):  
Numerical Model ◽  
Coastal Upwelling ◽  
Oil Spills ◽  
Storm Surges ◽  
Resonance Phenomenon ◽  
Estuarine System ◽  
The South ◽  
South Eastern ◽  
Tidal Propagation ◽  
Tidal Potential

Abstract 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).

scholarly journals EFFECTS OF BANK RAISING ALONG THE THAMES

1974 ◽  
Vol 1 (14) ◽  
pp. 145
Author(s):  
Anthony J. Bowen ◽  
Sally J. Pinless
Keyword(s):  
Numerical Model ◽  
Continuity Equation ◽  
Storm Surges ◽  
Water Flooding ◽  
Obvious Effect ◽  
One Dimensional ◽  
Thames Estuary

A one-dimensional numerical model was used to estimate the location and volumes of water flooding over the banks of the Thames Estuary under several combinations of bank levels and possible storm surges. An assessment of the probable damage resulting from each of these floods enabled a comparison to be made between the various possible schemes for bank improvement and, indeed, showed that there was a serious need for such improvement even though a start on the construction of the Thames Barrier was imminent. In an estuary such as the Thames the overflow may provide a significant turn in the continuity equation and the effect must therefore be programmed as an integral part of the model; one obvious effect of the overspill is to limit the maximum levels to about 0.2 m above the banks in the upper Thames, almost irrespective of the size of the surge.

Impact of the Swansea Bay Lagoon on Storm Surges in the Bristol Channel

2019 ◽  
Author(s):  
Qian Ma ◽  
Tulio Marcondes Moreira ◽  
Thomas A. A. Adcock
Keyword(s):  
Numerical Model ◽  
Storm Surges ◽  
Tidal Energy ◽  
Water Levels ◽  
Small Scale ◽  
Surrounding Area ◽  
The Past ◽  
Operating Strategies ◽  
Swansea Bay ◽  
The Impact

Abstract The proposed Swansea Bay tidal energy lagoon is an example of a relatively small-scale tidal barrage demonstrator project. A key concern with this technology is that such structures may exacerbate other environmental problems. However, such structures might also create beneficial environmental effects in some areas, such as mitigating the impact of storm surges. In this paper we model the hydrodynamics of the Swansea lagoon and surrounding area using a depth-averaged numerical model. We simulate a number of storm surge events from the past 40 years and analyse how the presence of the Swansea Lagoon (under various operating strategies) modifies the resulting water levels.

scholarly journals Storm-induced sediment supply to coastal dunes on sand flats

2020 ◽  
Vol 8 (2) ◽  
pp. 335-350 ◽  
Author(s):  
Filipe Galiforni-Silva ◽  
Kathelijne M. Wijnberg ◽  
Suzanne J. M. H. Hulscher
Keyword(s):  
Numerical Model ◽  
Storm Surge ◽  
Storm Surges ◽  
Coastal Dunes ◽  
Sediment Supply ◽  
Aeolian Transport ◽  
Sand Flat ◽  
Sediment Transfer ◽  
Sand Flats

Abstract. Growth of coastal dunes requires a marine supply of sediment. Processes that control the sediment transfer between the subtidal and the supratidal zone are not fully understood, especially in sand flats close to inlets. It is hypothesised that storm surge events induce sediment deposition on sand flats, providing fresh material for aeolian transport and dune growth. The objective of this study is to identify which processes cause deposition on the sand flat during storm surge conditions and discuss the relationship between the supratidal deposition and sediment supply to the dunes. We use the island of Texel (NL) as a case study, of which multiannual topographic and hydrographic datasets are available. Additionally, we use the numerical model XBeach to simulate the most frequent storm surge events for the area. Results show that supratidal shore-parallel deposition of sand occurs in both the numerical model and the topographic data. The amount of sand deposited is directly proportional to surge level and can account for more than a quarter of the volume deposited at the dunes yearly. Furthermore, storm surges are also capable of remobilising the top layer of sediment of the sand flat, making fresh sediment available for aeolian transport. Therefore, in a sand flat setting, storm surges have the potential of reworking significant amounts of sand for aeolian transport in periods after the storm and as such can also play a constructive role in coastal dune development.

scholarly journals A semi-implicit, second-order-accurate numerical model for multiphase underexpanded volcanic jets

2013 ◽  
Vol 6 (6) ◽  
pp. 1905-1924 ◽  
Author(s):  
S. Carcano ◽  
L. Bonaventura ◽  
T. Esposti Ongaro ◽  
A. Neri
Keyword(s):  
Relaxation Time ◽  
Numerical Model ◽  
Numerical Simulations ◽  
Solid Phase ◽  
Maximum Velocity ◽  
Second Order ◽  
Three Dimensions ◽  
Lagrangian Model ◽  
Coarse Particles ◽  
Nonequilibrium Effects

Abstract. An improved version of the PDAC (Pyroclastic Dispersal Analysis Code, Esposti Ongaro et al., 2007) numerical model for the simulation of multiphase volcanic flows is presented and validated for the simulation of multiphase volcanic jets in supersonic regimes. The present version of PDAC includes second-order time- and space discretizations and fully multidimensional advection discretizations in order to reduce numerical diffusion and enhance the accuracy of the original model. The model is tested on the problem of jet decompression in both two and three dimensions. For homogeneous jets, numerical results are consistent with experimental results at the laboratory scale (Lewis and Carlson, 1964). For nonequilibrium gas–particle jets, we consider monodisperse and bidisperse mixtures, and we quantify nonequilibrium effects in terms of the ratio between the particle relaxation time and a characteristic jet timescale. For coarse particles and low particle load, numerical simulations well reproduce laboratory experiments and numerical simulations carried out with an Eulerian–Lagrangian model (Sommerfeld, 1993). At the volcanic scale, we consider steady-state conditions associated with the development of Vulcanian and sub-Plinian eruptions. For the finest particles produced in these regimes, we demonstrate that the solid phase is in mechanical and thermal equilibrium with the gas phase and that the jet decompression structure is well described by a pseudogas model (Ogden et al., 2008). Coarse particles, on the other hand, display significant nonequilibrium effects, which associated with their larger relaxation time. Deviations from the equilibrium regime, with maximum velocity and temperature differences on the order of 150 m s−1 and 80 K across shock waves, occur especially during the rapid acceleration phases, and are able to modify substantially the jet dynamics with respect to the homogeneous case.

A Numerical Model for Storm Surges that Involve the Inundation of Complex Landscapes

2015 ◽  
Vol 57 (4) ◽  
pp. 1550017-1-1550017-30 ◽  
Author(s):  
David M. Kelly ◽  
Yi-Cheng Teng ◽  
Yuepeng Li ◽  
Keqi Zhang
Keyword(s):  
Numerical Model ◽  
Storm Surges ◽  
Complex Landscapes

Measurement of Local Convective Heat Transfer Coefficients With Temperature Oscillation IR Thermography and Radiant Heating

2005 ◽  
Author(s):  
S. Freund ◽  
S. Kabelac
Keyword(s):  
Numerical Model ◽  
Surface Temperature ◽  
Heat Conduction Problem ◽  
Temperature Response ◽  
Three Dimensions ◽  
Single Frequency ◽  
Phase Lag ◽  
Radiant Heating ◽  
Temperature Drift ◽  
Ir Camera

A method using temperature oscillations to measure local convection coefficients from the outside of a heat-transferring wall has been developed. This method is contact-free, employing radiant heating with a laser and an IR camera for surface temperature measurements. The numerical model extends previous research to three dimensions and allows for rapid evaluation of the convection coefficients distribution of sizable heat exchanger areas. The technique relies first on experimental data of the phase-lag of the surface temperature response to periodic heating, and second on a numerical model of the heat-transferring wall that computes the local convection coefficients from the processed data. The temperature data processing includes an algorithm for temperature drift compensation and Single Frequency Discrete Fourier Transformations. The inverse heat conduction problem of deriving a surface map of convection coefficients from the phase-lag data is solved with a new numerical approach based on a complex 3-D finite-difference method. To validate the experimental approach, measurements of the temperature response of a semi-infinite specimen were analyzed. The results obtained were within 1.6% agreement with the analytical solution. The numerical model was verified by comparison with data generated by the FEM program ANSYS. The results of preliminary experiments investigating the local Nusselt number of water entering a tube are in agreement with established correlations. Future applications of this method will involve an aerodynamic vortex generator in a wind tunnel and plate heat exchangers. Another possible application of the experimental method is non-destructive testing of materials known as Lock-In Thermography.

scholarly journals Numerical Modeling of Submarine Pipeline Scouring under Tropical Storms

Water ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1425
Author(s):  
Panyang Huang ◽  
Xin Meng ◽  
Haiyang Dong ◽  
Lin Chong
Keyword(s):  
Numerical Modeling ◽  
Numerical Model ◽  
High Speed ◽  
Wind Waves ◽  
Storm Surges ◽  
Tropical Storms ◽  
Submarine Pipeline ◽  
The East China Sea ◽  
Waves And Currents ◽  
Marine Engineering

Submarine pipelines are the lifelines of the national economy. Under the influence of typhoons, high-speed currents and waves continuously erode the seabed, leading to suspension or even rupture of pipelines. Therefore, it is of great importance to study the sediment transport under the action of waves and currents. A numerical model of sediment scouring and deposition combining wave and currents is established, which considered tidal current, storm surges, wind waves, and sediments in the East China Sea. Combining with the monitoring of the actual laying condition of pipelines, it is found that the area with the most serious scouring is around KP300. It is shown that the typhoon weather with high intensity and density will lead to the suspension of pipelines, which is noteworthy in the construction of marine engineering.

Storm Surge Estimation Along Tokyo Bay Based on a Simple Stochastic Approach

2018 ◽  
Author(s):  
Rikito Hisamatsu ◽  
Sooyoul Kim ◽  
Shigeru Tabeta
Keyword(s):  
Numerical Model ◽  
Storm Surge ◽  
Return Period ◽  
Empirical Formula ◽  
Stochastic Analysis ◽  
Storm Surges ◽  
Stochastic Approach ◽  
Insurance Companies ◽  
Tokyo Bay ◽  
Risk Transfer

In recent years, refinement of stochastic storm surge estimation is essential for risk management in insurance industries because the Japanese government promotes flood risk transfer to insurance companies. Insurance systems may reach peak risk when storm surge damage occurs; however, there are only a few studies on the stochastic analysis of storm surges. This paper presents the stochastic evaluation of storm surges in Tokyo Bay. First, storm surges are assessed using two methods of an empirical formula and a numerical model. Then, the return period of storm surges is stochastically evaluated. It is found that an empirical formula underestimates the surge level in comparison to the numerical model. Based on the results of numerical model, the return period of a storm surge is proposed in Tokyo Bay.

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