As rivers carry sediment to the sea different sediment structures are formed along shorelines, how is sediment important to both river and the shoreline ecosystems?
The focus of this lesson is depositional and erosional effects as rivers meet the sea. As a river meets the sea, the sediment it carries is deposited in a fan-like formation called a delta. As longshore drift picks up and transports the sediment, it can be carried and deposited down current to form shoreline sediment features such as sand bars, spits, and barrier islands. These sediments can protect areas behind them from the effect of ocean waves to form estuaries, salt marshes, and lagoons. Features such as headlands and sea stacks can intercept and deflect the currents, allowing sediments to be deposited on beaches in sheltered coves.
Review Essential Question and introduce Guiding Question.
Students should take a few minutes to respond to the reflection prompts. Discuss their answers and any questions they've generated.
Hand out Vocabulary Notes. Review the words. Students along with teacher can define words as they watch the PowerPoint Lesson.
Present PowerPoint Lesson.
Run Demonstration on Stream Table of a low-gradient mature river entering stagnant water. Show features such as braiding, delta formation, and longshore drift.
Hand out the second Reflection Journal Page. Give students time for a final reflection on the lesson.