Abstract
Water quality modelling is presented as a means of quantification of environmental impacts of civil engineering projects in coastal areas. This is illustrated with an application concerning the operation of a replacement airport for Hong Kong in Lantau Bay. The water movement to be expected, after the planned reclamation, is calculated separately with the two dimensional depth averaged model WAQUA on a minute to minute basis. The mu1ti-dimensiona1 water quality model DELWAQ is implemented in a two dimensional depth averaged way too, with a time step of several minutes. It has been used to calculate concentrations of three nitrogen fractions, phosphorus, BOD, coliforms and oxygen deficit, due to wasteloads to be expected. Also tentative calculations of suspended solids were performed. Results are presented in contour graphs, 3-dimensiona1 drawings and a movie of 3-d drawings.
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