what remedies were most effective in slowing down the erosion of the beach? What are the drawbacks to those remedies?

Ways to prevent beach erosion : Groyne, Offshore breakwater structure, Artificial headland. Disadvantages of each have been given below

Explanation:

Beach Erosion is of sand around coasts, it displaced to some other places.It can lead to flooding, building loss.

Ways to prevent beach erosion are :

1. Groyne  : A coastal structure - of wood, rock, bamboo - constructed perpendicular to the coastline from the shore into the,  sea to trap longshore sediment transport or control longshore currents.

2. An offshore breakwater structure : is built in the near shore zone, parallel to the shore and serves as a wave absorber. It helps reducing wave energy by serving as a wave absorber.  

3. Aritificial Headland : It is a structure constructed to promote natural beaches, as it plays role of a artificial headland. It is relatively easy to construct and little maintenance is required

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.