Simulation of Leachate Discharge from a Small Island into a Tidal Bay

by Angelos N. Findikakis, Bechtel Corp, San Francisco, United States,
Kit Yin Ng, Bechtel Corp, San Francisco, United States,

Document Type: Proceeding Paper

Part of: Symposium on Ground Water


A small island in a tidal bay was considered as a potential site for depositing large volumes of excavation material from a transportation project. The island is located in the inner part of the bay which forms a closed harbor. In the past, a large portion of the island was used as a landfill for more than forty years, receiving primarily domestic refuse. The landfill was abandoned in the late 1950's. The study described in this paper was in support of an effort to quantify the impacts of this landfill on the water quality in the bay, under present and proposed conditions, i.e., when excavation material from the project is deposited on the island. The study focused on a) estimating percolation rates in the landfill, b) analyzing subsurface flow and contaminant transport under the landfill and in its immediate vicinity, and c) simulating the transport and dilution of leachate discharges from the landfill in the harbor due to tidal circulation and dispersion. This paper discusses the subsurface flow and transport simulation model developed for this purpose.

Subject Headings: Tides | Islands | Landfills | Bays | Leachates | Subsurface flow | Flow simulation | Groundwater pollution

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