What Large estuaries are common on what kind of coastline?

1. Which of the following estuaries forms when sea level rises and floods an existing river valley?
2. What currents move sand and water parallel to the beach?
3. What feature would prove that a coastline is emergent?
4. What type of hard stabilization structure is built more or less parallel to the beach?
5. What are coastal plain estuaries?
6. What are coastal currents?
7. How does sand get onto beaches?
8. What is a rip tide in the ocean?
9. What is an emerged coastline?
10. What kind of man made feature would likely lead to sand loss on a beach?
11. What are usually built in pairs and extend into the ocean at the entrances to rivers and harbors?
12. What structures can be built to protect a shoreline?
13. What is an ocean groin?
14. What are the wooden structures on beaches?

Which of the following estuaries forms when sea level rises and floods an existing river valley?

Drowned river valley estuaries are formed when rising sea levels flood existing river valleys.

What currents move sand and water parallel to the beach?

Longshore currents are common at any beach that is exposed to breaking surf. A longshore current is an ocean current that moves parallel to shore. It is caused by large swells sweeping into the shoreline at an angle and pushing water down the length of the beach in one direction.

What feature would prove that a coastline is emergent?

Emergent coastlines display characteristics caused when sea level drops or the land rises (from tectonic uplift). * Wave cut platforms and elevated marine terraces.

What type of hard stabilization structure is built more or less parallel to the beach?

A breakwater is a hard stabilization structure built offshore and parallel to the beach to protect the coast and create a calm area of water. A seawall is a hard stabilization structure built near the beach and parallel to the shore to protect the coast from the force of waves.

What are coastal plain estuaries?

Coastal plain estuaries form from rising sea level, which fills an already existing river valley with water, creating an estuary. ... The San Francisco Bay is an example of a tectonic estuary. Bar built estuaries are behind some sort of natural bar between the estuary and the ocean, such as a spit.

What are coastal currents?

Coastal currents are coherent water masses in motion that are found in the region between the coastline and the edge of the continental shelf. ... Coastal currents often are considered as being made up of two components, alongshore, or parallel to the coast, and cross-shore, or perpendicular to the coast.

How does sand get onto beaches?

Most beaches get their sand from rocks on land. Over time, rain, ice, wind, heat, cold, and even plants and animals break rock into smaller pieces. ... Over thousands of years they break down into smaller and smaller rocks, pebbles, and grains of sand. Pounding waves and the ebb and flow of tides also make sand.

What is a rip tide in the ocean?

A rip current, sometimes incorrectly called a rip tide, is a localized current that flows away from the shoreline toward the ocean, perpendicular or at an acute angle to the shoreline. It usually breaks up not far from shore and is generally not more than 25 meters (80 feet) wide.

What is an emerged coastline?

An emergent coastline is a stretch along the coast that has been exposed by the sea by a relative fall in sea levels by either isostasy or eustasy. Emergent coastline are the opposite of submergent coastlines, which have experienced a relative rise in sea levels.

What kind of man made feature would likely lead to sand loss on a beach?

Man-made structures such as dams, jetties and breakwaters (forms of coastal armoring) alter the natural flow of sand, which accumulates behind these structures causing erosion of beaches downstream.

What are usually built in pairs and extend into the ocean at the entrances to rivers and harbors?

A jetty is a long, narrow structure that protects a coastline from the currents and tides. Jetties are usually made of wood, earth, stone, or concrete. They stretch from the shore into the water.

What structures can be built to protect a shoreline?

Breakwaters, groins, jetties, and seawalls have a significant impact on the shoreline and can even incidentally create, improve or destroy surf breaks and surfing waves. All these human-made mechanisms shape the coastline and alter the behavior and movement of sand and sediments.

What is an ocean groin?

Groins are shore perpendicular structures, used to maintain updrift beaches or to restrict longshore sediment transport. By design, these structures are meant to capture sand transported by the longshore current; this depletes the sand supply to the beach area immediately down-drift of the structure.

What are the wooden structures on beaches?

A groyne (in the U.S. groin) is a rigid hydraulic structure built perpendicularly from an ocean shore (in coastal engineering) or a river bank, interrupting water flow and limiting the movement of sediment. It is usually made out of wood, concrete, or stone.