Numerical simulations of peninsula groundwater flow and contaminant transport in different scenarios of land reclamation
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Abstract:
Using the numerical model GMS, in this paper we analyzed the impacts of three reclamation scenarios on groundwater flow field and contaminant transport in the Gulei Peninsula. The three designated reclamation scenarios were sand reclamation (Scenario 1), clay + sand reclamation (Scenario 2), and clay reclamation (Scenario 3). The results showed that (1) There was a regional increase of water table up to 4.78 m after reclamation. The extent of increase from small to large was as follows: Scenario 1, Scenario 2, and Scenario 3. (2) The groundwater flow field difference between different scenarios was the most prominent in the clay region. The maximum difference of water table between Scenario 2 and Scenario 1 was 4.44 m, and that between Scenario 3 and Scenario 1 was 8.20 m. (3) When only the physical interaction was considered, the horizontal contaminant transport was more prominent than the vertical transport in all the three scenarios. (4) Compared with the case of Scenarios 1 and 2, which had basically the same contaminant transport intensity, for the predicted duration of 30a, the contaminant transport area and speed in Scenario 3 respectively decreased by 23.07% and 18.89% in the horizontal direction; in the vertical direction, the contaminant mainly accumulated in the first layer. The concentration of contaminants in the first layer in Scenario 3 was 5.87 times of that in Scenario 1 (or Scenario 2). This indicates that reclamation with low-permeability clay have a certain retardation effect on contaminant transport.
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