What are two features that longshore currents form?

A longshore current develops where waves approach the shore at an angle, and swash and backwash on a beach move sediment along the shore. The combined effect of these two processes is sediment transport by longshore drift.

What is near shore current?

Nearshore Currents. > the area from shore to where waves break.

What is a cross shore current?

The continuous, directed movement of water (or air) is called a current. Reflected, or turned back, by the beach slope, water from waves becomes undertow or cross-shore currents, flowing seaward. As cross-shore currents meet with incoming waves, some water spreads sideward and merges with other sideward-moving water.

What are the 2 coastlines?

Types of Coastlines

RIA COASTS AND FIORD COASTS. Coastlines of submergence include ria coasts and fiord coasts.
BARRIER-ISLAND COASTS. The barrier-island coast is associated with a recently emerged coastal plain.
DELTA COASTS.
VOLCANO AND CORAL-REEF COASTS.
FAULT COASTS.
RAISED SHORELINES AND MARINE TERRACES.

What are the two types of coasts?

Such a classification leads to the definition of three general tectonic types of coasts: (1) collision coasts, (2) trailing-edge coasts, and (3) marginal sea coasts. Collision coasts are those that occur along active plate margins, where the two plates are in collision or impinging upon each other (Figure 6.1).

What is beach drift?

the drifting of sediments, especially marine sediments, in patterns parallel to the contours of a beach, due to the action of waves and currents. Also called littoral drift, longshore drift.

What are the 2 main factors that affect how quickly a coastline erodes?

The key factors which affect coastlines are:

The rock type/geology (see map below).
The fetch of the wave and the strength of the wind.
The angle of the slope – steep slopes erode more violently and frequently.
Weather conditions – freezing temperatures and heavy rain increase weathering and the rate of erosion.

What are the types of currents?

The two basic types of currents – surface and deep-water currents – help define the character and flow of ocean waters across the planet.

What are the two main sources of energy on a beach that distribute sediments?

The primary agent in coastal sediment transport is wave activity (see Wind wave), followed by tides and storm surge (see Tide and Storm surge), and near shore currents (see Sea#Currents) . Wind-generated waves play a key role in the transfer of energy from the open ocean to the coastlines.

What is a littoral current?

Definition of littoral current : a current moving along and roughly parallel to a shore.

How many types of coastlines are there?

There are 5 main types of coasts defined by the angle of incidence of the prevailing waves. Fig.

Where do cross-currents occur along the shore line?

Cross-currents along the shore-normal coastal profile. Cross-currents occur especially in the surf-zone. Three contributions balance each other: Mass transport, or wave drift, is a phenomenon occurring during wave motion over both sloping and horizontal beds.

What are the different types of currents in the sea?

The various types of currents in the sea, which may be important to coastal processes in one way or another, are described in the following. Fig. 1. Tidal currents in tidal inlet (Caravelas in Brazil). Tidal currents are strongest in large water depths away from the coastline and in straits where the current is forced into a narrow area.

What is a nearshore mooring system?

The nearshore mooring system in this document is intended to provide a long-term permanent stationkeeping solution, in that it is designed to keep the floating structure on position throughout its design life.

What is a longshore current and how does it work?

These currents are all driven by cross- and/or longshore components of radiation stress gradients (in practive wave energy gradients) that arise through wave breaking. The longshore current is the dominant current in the nearshore zone.