CHARACTERISTICS AND FORMATIONS OF LANDFORMS RESULTING FROM DEPOSITION LANDFORM FORMATION FLOODPLAIN This is the When a river floods onto the floodplain, wide valley the water slows down and deposits the floor on eroded material that it’s transporting. either side This builds up the floodplain (makes it of the river higher). which Meanders migrate (move) across the occasionally floodplain making it gets The deposition that happens on the flooded. slopes of the meanders also builds up the floodplain. May contain reeds and marshes. LEVEES Raised river These are natural embankments (raised banks (2-8m bits) along the edges of a river channel. high) During a eroded material is Made of deposited over the whole floodplain. gravel and The heaviest material is deposited stones closest to the river channel because it gets dropped first when the river slows down. Over time, the deposited material builds up, creating levees along the edges of the channel. ESTUARIES Estuaries Estuaries are found at the mouth of the form when river where it meets the sea. rivers meet The is tidal and the river level rises the sea and falls each day. Rivers near The water floods over the banks of the their mouth river carrying silt and sand onto the have a large valley floor. amount of As the tide reaches the highest point, load causing the water is moving very slowly so the the river to sediment is deposited. slow down Over time more and more mud builds up and lose creating mudflats energy At low tide the wide muddy banks are If the rate exposed. of deposition is greater then the rate of
CHARACTERISTICS AND FORMATIONS OF LANDFORMS RESULTING FROM DEPOSITION LANDFORM FORMATION FLOODPLAIN This is the wide valley floor on either side of the river which occasionally gets flooded. May contain reeds and marshes. When a river floods onto the floodplain, the water slows down and deposits the eroded material that it’s transporting. This builds up the floodplain (makes it higher). Meanders migrate (move) across the floodplain making it The deposition that happens on the slopes of the meanders also builds up the floodplain. LEVEES Raised river banks (2-8m high) Made of gravel and stones These are natural embankments (raised bits) along the edges of a river channel. During a eroded material is deposited over the whole floodplain. The heaviest material is deposited closest to the river channel because it gets dropped first when the river slows down. Over time, the deposited material builds up, creating levees along the edges of the channel. ESTUARIES Estuaries form when rivers meet the sea Rivers near their mouth have a large amount of load causing the river to slow down and lose energy If the rate of deposition is greater then the rate of Estuaries are found at the mouth of the river where it meets the sea. The is tidal and the river level rises and falls each day. The water floods over the banks of the river carrying silt and sand onto the valley floor. As the tide reaches the highest point, the water is moving very slowly so the sediment is deposited. Over time more and more mud builds up creating mudflats At low tide the wide muddy banks are exposed.
Paper_1_-_All.docx