Environmental Impact Analysis:
Scoping, Screening, Assessment
    EIA - Environmental Impact Assessment:   A Coastal Water Quality Example

    Lebanon Chemical Fertilizer Factory, Selaata:   release of phosphogypsum sludge
    For the near-shore region around the Lebanon Chemical Company (FF) fertilizer plant in Selaata, Lebanon, the 3D oceanographical model system ROMS is being set up to describe the dispersion and spatial distribution of phosphogypsum sludge emitted by the plant as one of the inputs for a more comprehensive environmental audit. The system is implemented as a web-based client server system to facilitate remote access and shared use.

    Nested model domains around a central 5 by 5 km are around the discharge point within a 12 by 12 km master domain are being defined with varying resolutions down to 10 m for the near field, 10 or more vertical layers, and the necessary input data: bathymetry, surface forcings, lateral boundary (flow) conditions, and emissions are being compiled, analysed, and integrated in a set of data bases for direct use by mode scenarios.

    Local Bathymetry has been prepared by a combination of ETOPO1 global bathymetry data and local data from the British Admiralty chart 1652 (1:25,000) with more than 100 depth soundings interpolated by the Kriging method.
    Meteorological boundary conditions for the ROMS model scenarios are generated by the 3D prognostic meteorological model MM5 with hourly and 1 km spatial resolution.

    ROMS is being configured for the simulation of "cohesive sediments" to represent the phosphogysum sludge, with sedimentation and erosion processes considered. The model describes dispersion, sedimentation, and re-suspension of sediments on a regular quadratic (horizontal) grid with terrain following vertical resolution,.

    First model results in the master domain for selected dates (September 26/27, 2010) indicate the expected strong logarithmic concentration/deposition gradients and consequently highly local accumulation of the sludge discharge. Average concentration across the water column shows a strong vertical gradient and decreases sharply with distance from the source.

    Model results are being made available in standard numerical formats (NetCDF and CSV) for further processing for environmental toxicology and risk assessment.

    Case study: LCC, Selaata Model implementation Input data


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