c. Laboratory experiments performed in a unidirectional flow flume to 

 assess the erosion rates of undisturbed till samples which were extracted 

 from the lake bed offshore of St. Joseph. 



Chapter 2 of this report provides a review of the information presented in 

 the companion reports as well as an overview of the problem at St. Joseph. In 

 addition, cohesive shore processes are summarized. 



A summary of the data used for the analyses completed as part of this 

 investigation is presented in Chapter 3. The primary components of these data 

 consist of repeated beach profiles, lake bed bathymetry, and shoreline recession 

 rates. The results of additional data collection, including subsurface profiling 

 with ground-penetrating radar and sediment sampling, are presented in the 

 companion reports by Parson, Morang, and Nairn (1996) and by Parson and 

 Smith (1995), respectively. 



Chapter 4 presents the results of a series of analyses performed to develop 

 an understanding of the evolution of the shoreline and lake bed in the vicinity 

 of St. Joseph and the influence of the beach nourishment program on the evo- 

 lution. These analyses include 2-dimensional (2-D) and 3-dimensional (3-D) 

 numerical modeling of sediment transport, profile comparisons, and bathymetry 

 comparisons. 



Based on the results of the analyses described in this report, and from the 

 companion report by Parson, Morang, and Nairn ( 1 996), a descriptive model of 

 the historic coastal morphodynamics in the vicinity of St. Joseph is developed 

 and presented in Chapter 5. This descriptive model is used to project the 

 future evolution of coastal morphology. It is in this context that the effective- 

 ness of the ongoing beach nourishment program is evaluated. 



Recommendations for future nourishment efforts at St. Joseph are made on 

 the basis of establishing realistic goals for the program in Chapter 6 of the 

 report. A discussion of general principles for beach nourishment design on 

 cohesive shores downdrift of harbor structures concludes the report. 



Chapter 1 Introduction 



