2 Prior Monitoring of the Site 



Initial (Comprehensive) Monitoring 



General 



The jetty rehabilitation project at Manasquan Inlet was selected for moni- 

 toring under the MCNP Program in 1982 during the second year of the program. 

 The goal of the program is the advancement of coastal engineering technology. 

 It is designed to determine how well projects are accomplishing their purposes 

 and are resisting the attacks of the physical environment. The primary objective 

 of the Manasquan Inlet jetties rehabilitation monitoring plan was to determine 

 the stability of the jetties, particularly the dolos armor units. This was the first 

 application of dolosse in the United States in the east coast environment. Addi- 

 tional objectives were to determine potential effects of the rehabilitated jetties on 

 longshore sediment movement at the inlet and determine the effectiveness of the 

 rehabilitated jetties in maintaining a stable inlet cross section. 



Data collection for the monitoring program at Manasquan Inlet occurred from 

 June 1982 to October 1984. The monitoring program incorporated the use of 

 several observational, direct measure, and remote sensing methodologies. It 

 included the collection of wave and tide data, hydrographic and beach surveys, 

 aerial photography, photogrammetric analysis of armor unit movements, broken 

 armor unit surveys, and underwater surveys utilizing side-scan sonar. Results of 

 this study were published in Gebert and Hemsley (1991). Aerial photography, 

 photogrammetric analysis of armor unit movements, and broken armor unit sur- 

 vey data, which are relative to the Periodic Inspections work unit, are summar- 

 ized below. 



Aerial photography 



Aerial photography is a very effective means of capturing images of large 

 areas for later analysis, study, visual comparison with previous or subsequent 

 photography, or measurement and mapping. Its chief attribute is the ability to 

 freeze a moment in time, while capturing great detail. 



Chapter 2 Prior Monitoring of the Site 



15 



