Figure 8. The results show that for CODMn, the concentration is generally low, so there is no area where its concentration exceeding the regulatory limit. For Nitrogen, within the first two spring-neap tidal cycles, the affected area is markedly large during neap tides, but is less than 30 km2. However, after the third neap tides, the area affected by the higher concentration Nitrogen is considerably increased. Close examination of the evolution of the
affected area through the tidal cycles (not shown here) finds that the concentration is built up gradually with more peaky distribution in a confined area, but it reaches the peak before the third neap tides, and then the concentration of Nitrogen disperses rapidly to the surrounding area, which results in the large area being over the regulatory limits.
Figure 8. The results show that for CODMn, the concentration is generally low, so there is no area where its concentration exceeding the regulatory limit. For Nitrogen, within the first two spring-neap tidal cycles, the affected area is markedly large during neap tides, but is less than 30 km2. However, after the third neap tides, the area affected by the higher concentration Nitrogen is considerably increased. Close examination of the evolution of theaffected area through the tidal cycles (not shown here) finds that the concentration is built up gradually with more peaky distribution in a confined area, but it reaches the peak before the third neap tides, and then the concentration of Nitrogen disperses rapidly to the surrounding area, which results in the large area being over the regulatory limits.
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