Nature Freak Explores Beach Erosion

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Environmental Science:

Environmental Science Lesson 6 Exploration Lab: “Beaches” By Forrest Thomas

Hypothesis; Breakwaters, jetties and rocky shorelines can reduce the impact of waves and reduce beach erosion.:

Hypothesis; Breakwaters, jetties and rocky shorelines can reduce the impact of waves and reduce beach erosion.

Slide 3:

Breakwater Model

A beach eroding with no protection :

A beach eroding with no protection

Natural limestone used to form breakwater. :

Natural limestone used to form breakwater.

Beach sand was piled behind breakwater to simulate beach:

Beach sand was piled behind breakwater to simulate beach

I used a stick to push water up against the breakwater to simulate waves acting on the beach. :

I used a stick to push water up against the breakwater to simulate waves acting on the beach.

Waves lifted sand from between the breakwater and carried it away in the backwash.:

Waves lifted sand from between the breakwater and carried it away in the backwash.

Removing one of the breakwaters revealed how much the beach was protected behind the breakwater:

Removing one of the breakwaters revealed how much the beach was protected behind the breakwater

Slide 10:

Longshore Currents Model

Rebuilding the beach.:

Rebuilding the beach.

Placing a wood block to simulate a jetty.:

Placing a wood block to simulate a jetty.

Observation; Placement of the jetty was very important. I observed that the sand was protected mostly on the back side of the jetty. :

Observation; Placement of the jetty was very important. I observed that the sand was protected mostly on the back side of the jetty.

I used multiple wooden blocks to simulate multiple jetties along a shore.:

I used multiple wooden blocks to simulate multiple jetties along a shore.

Using my hand, I simulated longshore waves acting on the beach.:

Using my hand, I simulated longshore waves acting on the beach.

The jetties helped to retain the sand by blocking them from eroding :

The jetties helped to retain the sand by blocking them from eroding

Observation; Jetties need to be built into the shore as much as possible to prevent water from eroding beach behind the jetty.:

Observation; Jetties need to be built into the shore as much as possible to prevent water from eroding beach behind the jetty.

Observation; I observed that the most beautiful beaches typically had some sort of natural jetty or breakwater to protect them.:

Observation; I observed that the most beautiful beaches typically had some sort of natural jetty or breakwater to protect them.

Observation; The silting situation could be improved if we open up the other end of the breakwater and allow water to flow through.:

Observation; The silting situation could be improved if we open up the other end of the breakwater and allow water to flow through.

Conclusions; Structures such as breakwaters and jetties can be used to help preserve beaches from erosion. In overused public beaches, daily grooming of the beach at low tide can help preserve a beach.:

Conclusions; Structures such as breakwaters and jetties can be used to help preserve beaches from erosion. In overused public beaches, daily grooming of the beach at low tide can help preserve a beach.

Forrest Thomas Environmental Science Hummingbird Cay, Bahamas April 2011:

Forrest Thomas Environmental Science Hummingbird Cay, Bahamas April 2011