An explicit scheme for advection-diffusion modelling in two dimensions

Ekebjaerg, Lars C.; Justesen, Peter

doi:10.1016/0045-7825(91)90091-j

Cited by 46 publications

(32 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Numerical discretization of Eq. (4) is performed using the QUICKEST explicit scheme, which is a third order, finite difference algorithm (Ekebjaerg and Justesen, 1991). Both the hydrodynamic and transport models are run with a time step of 15 s to achieve stability of the numerical schemes.…”

Section: Transportmentioning

confidence: 99%

Reactive-transport modelling of C, N, and O2 in a river–estuarine–coastal zone system: Application to the Scheldt estuary

et al. 2007

View full text Add to dashboard Cite

A fully coupled, two-dimensional hydrodynamic and reactive-transport model of C, N, O 2 and Si along a river-estuarinecoastal zone system is presented. It is applied to the Scheldt continuum, a macrotidal environment strongly affected by anthropogenic perturbations. The model extends from the upper tidal river and its tributaries to the southern Bight of the North Sea. Five dynamically linked nested grids are used, with a spatial resolution progressively increasing from 33 m to 2.7 km. The biogeochemical reaction network consists of aerobic degradation, nitrification, denitrification, phytoplankton growth and mortality, as well as reaeration. Diagnostic simulations of a typical summer situation in the early 1990s are compared to field data taken from the OMES database (>300 samples per variable). Results demonstrate that the process rates in the tidal river are very high and far larger than in the saline estuary, with maximum nitrification rates in the water column up to 70 mM N day − 1 , and maximum aerobic respiration and denitrification up to 70 and 40 mM C day − 1 , respectively. Phytoplankton production is about one order of magnitude lower, a result which confirms the dominance of heterotrophic processes in this system. The influence of secondary and tertiary wastewater treatment in the catchment is then assessed. Results show a significant decrease of organic matter and ammonium concentrations above Antwerp, which in turn leads to a partial restoration of oxygen levels. The model also predicts a reduction of denitrification rates, which locally results in a 4-fold increase of the nitrate concentration. Mass budgets for carbon, nitrogen and oxygen are established for the saline estuary (km 0 to 100) and for the tidal river network (km 100 to 160). Three scenarios, corresponding to the situation in the early 1990s, the years 2000 and the situation expected in 2010 are considered. They show that the tidal river and the estuary contribute almost equally to the overall biogeochemical cycling of these elements, despite the very different water volumes involved. For the simulated periods, the large decrease in nitrogen input (> 55%) expected between 1990 and 2010 will not lead to a significant decrease of N export to the coastal zone during the summer period.

show abstract

Section: Transportmentioning

confidence: 99%

Reactive-transport modelling of C, N, and O2 in a river–estuarine–coastal zone system: Application to the Scheldt estuary

et al. 2007

View full text Add to dashboard Cite

show abstract

“…Therefore, in order to find out how much the dispersion coefficient affects the inlet temperature, the simulation was carried out by different dispersion coefficient values. According to these simulations, it was concluded that various dispersion coefficients have little effect on inlet temperature, and it does not affect the simulation results so much (see table 1), [1,4,5,6, 9].…”

Section: Advection Dispersion Model Calibration / Verificationmentioning

confidence: 99%

Modeling of thermal pollution in the northern coastal area of the Persian Gulf and its economical and environmental assessment

Abbaspour¹,

Javid²,

Moghimi³

et al. 2006

WIT Transactions on Ecology and the Environment, Vol 95

View full text Add to dashboard Cite

The Persian Gulf is one of the aquatic ecosystems which has recently been faced with different pollutions. Cooling water discharges due to various industries such as power plants can cause important disorders on the present ecosystem balance and on aquatic creatures because of their high temperature. Thermal pollution leads to their migration, creates a potential for new coming species which in turn can thoroughly change the marine ecosystem feature. In this research, thermal pollution due to the Bandar Abbas Thermal Power Plant (BATP) development plan was modeled using MIKE21 software. In order to avoid a decrease in the power plant efficiency in the development plan, the distance between the inlet and outlet was determined by comparing the results of different scenarios and economical aspects. After determining the distance between the inlet and outlet, the water temperature in the coastal area was compared with the standards of the Iranian Department of the Environment (DOE). The model results show that the water temperature, in Bandar Abbas coastal area, exceeds the permissible limit (3°C) at a distance equal to 200 m from the discharging location, and in order to reduce its harmful impacts, some suggestions are made to reduce the associated thermal pollution.

show abstract

“…The well-known QUICKEST scheme lies at the basis of this scheme [Leonard, 1979;Ekebjaerg et al, 1991].…”

Section: Hd Modulementioning

confidence: 99%

Modeling and remote sensing of suspended sediments in the Gulf of Kachchh, India

Gupta

2015

European Journal of Remote Sensing

View full text Add to dashboard Cite

This paper presents a comprehensive analysis of OCEANSAT-1 OCM (Ocean Color Monitor)-derived suspended sediment concentration (SSC), MIKE 21-simulated SSC, bathymetry, and tidal current speed and direction using tidal harmonic analysis to study the suspended sediments in the Gulf of Kachchh in the Arabian Sea for tidal and monsoonal changes. The spring tide and bathymetry predominantly control the sediment dynamics at Okha and Navlakhi ports as shown by the time series data. The sequential high temporal resolution of OCM-derived SSC images is near-ideal means for monitoring the Gulf. The abrupt OCM-derived SSC values were due to the combined influence of deficient monsoon in 2004, prevailing winds, and the re-suspension of bottom sediments.

show abstract

An explicit scheme for advection-diffusion modelling in two dimensions

Cited by 46 publications

References 3 publications

Reactive-transport modelling of C, N, and O2 in a river–estuarine–coastal zone system: Application to the Scheldt estuary

Reactive-transport modelling of C, N, and O2 in a river–estuarine–coastal zone system: Application to the Scheldt estuary

Modeling of thermal pollution in the northern coastal area of the Persian Gulf and its economical and environmental assessment

Modeling and remote sensing of suspended sediments in the Gulf of Kachchh, India

Contact Info

Product

Resources

About