that wave focusing by Shrewsbury Rocks may cause gradients in wave height 
and direction which in turn produce gradients in longshore sediment transport. 
Gradients in longshore sediment transport rates could then cause erosion of the 
shoreline. This task evaluates the potential of wave focusing by Shrewsbury 
Rocks to cause the Monmouth Beach hot spot. Evaluation of the offshore 
feature’s influence on the hot spot includes statistical analysis of available wave 
gauge information and determination of the reaches of shoreline within the 
shadow zone of the rock outcropping. 
Cross-shore adjustment 
Erosion within the hot-spot region may be due to greater than anticipated 
cross-shore adjustment of the construction template, resulting in decreased beach 
width at the hot spot. In evaluating the contribution of cross-shore profile 
adjustment to the development of the hot spot, an analysis of the cross-shore 
evolution of the beach-fill cross section is performed. The prefill, postfill, and 
theoretical equilibrium profile shapes are compared and an assessment made of 
the present state of cross-shore adjustment and the anticipation of additional 
cross-shore adjustment of the profiles and subsequent decreases in beach width. 
Beach-fill end losses 
End losses are significant for beach fills constructed with short lengths. 
Since the beach fill in the hot-spot region at southern Monmouth Beach 
protrudes seaward of the beach fill placed in adjacent areas, it can be ideally 
treated as a short, rectangular beach fill placed upon a longer beach fill. This 
task examines the losses associated with a short, rectangular fill using an 
analytical approach and an idealized application of the GENESIS numerical 
model for shoreline change (Hanson and Kraus 1989). 
Beach-fill planform adjustments 
Because the beach fill in the hot-spot area at Monmouth Beach protrudes 
seaward of the adjacent shorelines, the loss of beach fill from the hot-spot region 
may be related to the planform adjustment of the beach fill to an orientation 
similar to the offshore bathymetric contours. This task focuses on identifying 
trends in bathymetric evolution of the beach fill and the implications of these 
evolutionary trends in the development of the erosional hot spot. 
Chapter 1 
Background 
