APPENDIX A 



1. Beach profile 



2. Profile line 



DEFINITIONS OF PROFILE GEOMETRY 



The cross section of a beach surface (the intersection 

 of a vertical plane and the beach) . 



The line followed by surveyors in making a beach pro- 

 file. The line is determined by two previously 

 established fixed points (one of which is a bench 

 mark or monument), or by one fixed point and an angle 

 measured from a known direction. 



3. Profile coordinates The distance-elevation pairs of numbers measured by 



surveyors to locate a point on the beach profile. 



4. Distance 



Elevation 



6. Contour 



7. Contour intercept 



8. Profile area 



The horizontal coordinate of a point on a beach profile, 

 measured positively seaward from a fixed point on the 

 profile line. 



Vertical coordinate of a point on a beach profile, 

 measured positively upward from a known datum. The 

 datum in this report is the National Geodetic Vertical 

 Datum (NGVD) of 1929. In the field, elevation of a 

 point on a beach profile is determined by measuring 

 the vertical difference between the point and the 

 monument whose elevation has been established. 



A line of constant elevation along the beach surface 

 (the intersection of a horizontal plane and the beach 

 surface) . 



The point defined by the intersection of a contour 

 with a beach profile. On some profiles, there may be 

 more than one intercept of a given contour. 



The area bounded above by a beach profile, landward by 

 a vertical line, and below by a horizontal line. The 

 vertical line intersects either the monument or the 

 landward end of the beach profile. The horizontal 

 line passes through the MSL contour intercept. Area 

 was computed by a computer program which summed 

 vertical trapezoidal areas whose upper corners were 

 profile coordinates. At the seawardmost area, where 

 the profile meets the MSL bound, the area is a triangle. 



A(p,t) = 



Jxi 



y dx 



9. Unit volume 



(beach storage) 



The product of a cross-sectional area and a unit length 

 perpendicular to the area, given in units of volume per 

 length of shoreline, cubic yards per foot in this paper. 



V(p,t) = A(p,t) As 



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