. Boston Logan International Airport environmental impact study. Logan International Airport; Airports; Environmental impact statements; Harbors; Oceanography; Pollution; Pollution; Transportation. Lake Hourly Dispersion 689. 0230 HRS. AUG. 6, I96S Fig. 1. Successive hourly current vectors occurring at location 022 plotted sequentially head to tail. can be obtained [Palmer, 1970a] by considering only the largest and smallest current states with associated probabilities (see Table 1}. 1 If each one of these sequences could be con- sidered as tracing a possible particle path, it would be possibl
. Boston Logan International Airport environmental impact study. Logan International Airport; Airports; Environmental impact statements; Harbors; Oceanography; Pollution; Pollution; Transportation. Lake Hourly Dispersion 689. 0230 HRS. AUG. 6, I96S Fig. 1. Successive hourly current vectors occurring at location 022 plotted sequentially head to tail. can be obtained [Palmer, 1970a] by considering only the largest and smallest current states with associated probabilities (see Table 1}. 1 If each one of these sequences could be con- sidered as tracing a possible particle path, it would be possible to determine a diffusion coefficient by determining a standard deviation of the weighted distances traveled. To do so, it is necessary to assume that Eulerian measure- ments approximate Lagrangian determinations. There is some precedence for this assumption in meteorology [Hay and PasquiU, 1957; Lumley, 1964] and in laboratory pipe flows [Mickehen, 1955] for large Reynolds number, homogeneous and isotropic flow fields. The Reynolds numbers for the lake (the depth being the length parameter) are typically 2 X 10*. Spatial homogeneity for a large flow system, such as the lake, have been verified by cross- correlating current time histories for points separated by 1 and 3 km. Correlations for 1-km separation are highly significant. By restricting the hourly considerations to approximately 5 hours (shorter times could also be used), dis- tances traveled are normally less than 1 km. In addition, the auto correlation functions for cur- rents are generally reasonably flat for the first 5 hours. The time period selected should be the one of interest compatible with the current characteristics in the area. On this basis, we. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Massachusetts Port Authority.
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