Objectives 



The objectives of this component of the SUPERTANK project were to 

 provide the following: 



a. A fine, uniform beach sand. 



b. Measurements of sediment density to quantify variations in bulk 

 density in the nearshore region. 



c. Measurements of wave-induced pore pressure in the nearshore. 



Scope 



This chapter describes the materials, equipment, procedures, and sample 

 results associated with in situ sediment behavior. The discussion is ordered as 

 follows: 



a. Beach material. 



b. Sediment density measurements. 



c. Pore pressure measurements. 



Experiment Apparatus 



Beach material 



The beach sand used in the SUPERTANK project was obtained from an 

 aeolian deposit in Florence, OR. The material was procured from a dune 

 sand enterprise, commercially identified as Leisure Acres, Incorporated. This 

 material was selected because of its similarity to beach sand found along the 

 central Oregon coast. The grain size distribution is that of a fine-grain, uni- 

 form quartz sand with a median grain size of 0.22 mm. 



The material was front-end loaded from the dune base into 20-cu-yd (15.3- 

 cu-m), belly dump trucks. The truck beds were covered with tarpaulins to 

 prevent loss of material during transit. The truck-transport system appears in 

 Figure 12-1. The material was deposited on the pavement next to the wave 

 channel and placed in the channel with a front loading Bobcat, Model 753. 

 The Bobcat, with a 0.25-cu-yd (0.19-cu-m) bucket, appears in Figure 12-2. 



236 



Chapter 1 2 Pore Pressure and Sediment Density Measurements 



