Hook Bay, with specific reference to the locations of marinas near High- 

 lands, New Jersey. The comprehensive model was used to determine the 

 effects of the new inlet on normal tides, hurricane surges, tidal cur- 

 rents, salinities, temperatures, and the concentrations of pollutants in 

 the study area for various input sources of pollution. 



(9) Summary of Test Results . The following results of the 

 model tests are summarized to provide a quick appraisal of the effects 

 of the new inlet on various environmental factors. Table 3-4 shows the 

 effects of the new inlet on average salinities in the major compartments 

 of the study area (Sandy Hook Bay, Shrewsbury River, and Navesink River) , 

 The maximum change in average salinity amounted to about 0.3 part per 

 thousand. 





Table 3-4. Effects of plan 3 on average salinities. 



Test 



Chlorides ' 



Sandy Hook Bay 



Navesink River 



Shrewsbury River 



Base 

 Plan 3 



16.0 

 16.1 



14.3 

 14.0 



14.9 

 15.1 



Parts per thousand. 



The effects of the new inlet on normal tides at three locations in 

 the study area are shown in Figure 3-67 (note that normal tides were 

 essentially unaffected). The effects on water surface elevations for a 

 test involving reproduction of the November 1950 hurricane surge in the 

 harbor are shown in Figure 3-68. The maximum elevation of the surge was 

 not changed by the new inlet, but outflow through the new inlet allowed 

 surge elevations in Sandy Hook Bay to drop slightly faster than for 

 existing conditions. 



Figure 3-69 shows current velocities over a complete tidal cycle at 

 three locations in the study area (see Fig. 3-64 for location of sta- 

 tions). Current velocities were not changed significantly by the new 

 inlet, although the time phasing of the current at a station near the 

 new inlet (R2-W) was modified. This information, together with the tidal 

 data, show conclusively that the new inlet would not change existing flow 

 rates and volumes of inflow and outflow between Sandy Hook Bay and Shrews- 

 bury and Navesink Rivers. The inflow and outflow control would remain in 

 the relatively small channel connecting Sandy Hook Bay with the Shrewsbury 

 and Navesink Rivers, and dredging of the new inlet would not change this 

 control section in any way. 



Figure 3-70 shows the effects of the new inlet on the rate of change 

 in temperature in the study area for conditions simulating an upwelling 

 of cold ocean water off Sandy Hook (a fairly common occurrence). The 

 rate at which water temperatures decreased in the study area because of 

 such upwelling was essentially the same with the new inlet installed as 

 for existing conditions, thus indicating that the new inlet would have no 

 significant effects on water temperature. 



58 



