Estuary freshwater inflow

High school (ages 12+)
Geography

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Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/estuary-freshwater-inflow

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the primary hydrological driver?Freshwater inflow dictates salinity gradients, stratification, and residence time in estuaries
2. What is the human impact?Dams and water abstraction significantly reduce freshwater inflow, leading to ecological degradation
3. What is freshwater inflow in an estuary?Freshwater inflow is the water that comes from rivers, rain, snow, and underground sources into the area where the river meets the sea. It helps mix fresh and salty water.
4. Why does freshwater inflow matter for fish and other animals?It creates different salty zones that young fish and shellfish need to grow safely. It also brings nutrients that feed tiny plants and the whole food chain.

Salinity Gradient: A gradual change in salt concentration from fresher to saltier water within an estuary.
Saltwater Wedge: A layer of denser saltwater that intrudes beneath the less dense freshwater in an estuary.
Residence Time: The average amount of time water stays within an estuarine system before being flushed out.
Ontogenetic Shift: A change in an organism's characteristics, such as salinity tolerance, as it grows and develops.