1, the coastline is changeable.
One of the characteristics of coastal landforms is its changeable shape. Due to the influence of waves, tides, tidal currents and estuaries, the coastline will take on different shapes, such as estuaries, fjords, promontories and bays.
2. Coastal erosion and deposition
Coastal landform is influenced by ocean erosion and deposition, and has obvious erosion and deposition characteristics. The impact of waves will erode the coastline, forming cliffs, platforms and caves. At the same time, the sand carried by the waves will be deposited on the coastline, forming beaches, sand dunes and other landforms.
3. Formation of estuaries and bays
Rivers flowing into the ocean will form estuaries, and the erosion and deposition of the ocean will also form bays. Estuaries and bays are usually important topographical features at the intersection of land and sea, and are important components of coastal landforms.
The main reasons for the formation of coastal landforms are as follows:
1. tectonic activity: the plate movement of the earth will lead to the uplift, subsidence or fracture of the crust, thus affecting the formation of coastal landforms. For example, the seismic activity at the plate boundary can lead to the uplift of the seabed crust and form coastal landforms, such as steep cliffs.
2. Wave erosion: Wave is one of the important factors of coastal landform formation. The impact, collision and erosion of sea waves will change the shape of coastline. Powerful waves can erode coastal rocks, forming caves, arches and other landforms.
3. River movement: River erosion and deposition will also affect the formation of coastal landforms. Rivers bring a lot of sediments to the ocean and deposit them near the coastline, forming estuaries, valleys, sandbars and other landforms.