CONTENTS 



TABLES--Continued 



Page 



18 Average abundance and number of species per sample as a 



function of intertidal stratum and depth 79 



19 Percent contribution of major taxonomic groups and their 



abundance and diversity at different depths 80 



20 Regression analysis file of associated biological and physical- 



chemical variables from Imperial Beach surveys 82 



21 Number of infaunal species collected at Imperial Beach during 



predisposal surveys I and II at the 3.7-meter depth 84 



FIGURES 



1 Location of sampling stations at Imperial Beach, California. . . 21 



2 Single station sampling scheme 24 



3 Sampling scheme for cores for analysis of grain size and 



carbon content 25 



4 Approximate beach profiles for intertidal stations for all 



surveys 29 



5 Station A (northern dredge-disposal site) changes in beach 



profile 32 



6 Station C (control site) , an unreplenished section of beach 



showing natural erosion 33 



7 Wave energies for Imperial Beach expressed in terms of 



<n^> cm^ 34 



8 Median grain-size diameter and median phi units from 



sediment samples 36 



9 Percent very fine sand (diameters smaller than 125 



micrometers) from sediment samples 37 



10 Volume (milliliters) of coarse sand (diameter larger than 



0.5 millimeter) along intertidal transect lines for station A 



and station C for survey V, November 1977 39 



11 Percent very coarse sand (diameter larger than 1.0 millimeter 



from sediment samples) 40 



12 Sediment sorting coefficients for 3.7- and 6.1-meter stations. . 41 



6 



