5 Analysis and Interpretation of 

 Coastal Data 



All geologic and engineering project data, whether obtained from 

 secondary sources, field prototype collection, laboratory analyses, or physical 

 models, must be analyzed and interpreted to ultimately be useful in studies of 

 the geologic and geomorphic history of coasts. The analysis procedures 

 depend upon the type of data collected. Some analyses require subjectivity or 

 interpolation, such as constructing geologic cross sections or making seismic 

 interpretations. Others are highly objective involving computer probabilistic 

 models. A coastal scientist or engineer should be aware of the assumptions 

 and errors involved, and should attempt to provide sufficient information so 

 that his analyses can be replicated and the interpretation supported. 



Computers play an important role in analysis and interpretation of data 

 from various sources. Statistical techniques are applied to a variety of data, 

 including: (a) spectral analysis of wave characteristics; (b) wave refraction 

 analysis; (c) time series analysis of water level data; (d) Fourier analysis of 

 current data; (e) moment measures of grain size; (f) eigenvectors of shoreline 

 change; and (g) the use of fractals in shoreline geometry. Computers are also 

 used for numerous types of calculations, such as volumetric changes in beach 

 profiles, as well as two-and three-dimensional plotting of these changes. If 

 numerous types of spatial data exist for a location, they may be entered into a 

 GIS so that important questions can be addressed involving spatial changes. 

 Computer software and hardware are also used for analysis, classification, and 

 interpretation of digital remotely sensed data from satellites and aircraft. 



The following sections will briefly outline some concepts and procedures 

 pertinent to analyses of coastal data. The reader is referred to specialized 

 texts for detailed descriptions of the underlying mathematics and data 

 processing methods. 



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Chapter 5 Analysis and Interpretation of Coastal Data 



