Figure 7. Aerial photograph of Humboldt Bay jetties (1 997) 



Purpose of the Study 



Purposes of the study reported herein were as follows: 



a. Develop methods using limited land-based surveying, aerial photography, 

 and photogrammetric analysis to assess the long-term stability response of 

 the concrete dolos armor units on the heads of the Humboldt Bay jetties. 



b. Conduct land surveys, broken armor unit inspections, aerial photography, 

 and photogrammetric analyses to accomplish the following: 



( 1 ) Test and improve developed methodologies and accurately define 

 armor unit movement above the water line. 



(2) Establish base conditions for the jetties' armor units which can be 

 revisited in the future under the Periodic Inspections work unit. 



Chapter 1 Introduction 



13 



