erosion by the sea then sediment will be deposited An example of a river valley in the UK to identify its major landforms of erosion and deposition = THE RIVER TEES HIGH FORCE = WATERFALL AND GORGE – YARM MEANDER, LEVEES AND FLOODPLAINS MIDDLESBOROUGH = ESTUARY Flooding A river flood occurs when a river channel can no longer hold the amount of water flowing in it so overlaps the banks onto the adjacent land (floodplain). PHYSICAL FACTORS HUMAN FACTORS 1. Heavy precipitation – leads to flash floods Urbanisation – building on a floodplain as the river channel cannot contain the creates impermeable surfaces (tarmac volume of water. roads) means water cannot infiltrate – 2. Geology impermeable rocks (shale/clay) into the ground. Drains can also block. prevents water soaking through so it remains Deforestation – reduces the amount of on the surface and directs the water to the evapotranspiration so is more river. water on the surface and in the river 3.Relief– steep slopes/mountainous channel. – environments causes the water to runoff the Agriculture loose soil is moved into surface into the river. rivers through surface runoff.
erosion by the sea then sediment will be deposited An example of a river valley in the UK to identify its major landforms of erosion and deposition = THE RIVER TEES HIGH FORCE = WATERFALL AND GORGE YARM – MEANDER, LEVEES AND FLOODPLAINS MIDDLESBOROUGH = ESTUARY Flooding A river flood occurs when a river channel can no longer hold the amount of water flowing in it so overlaps the banks onto the adjacent land (floodplain). PHYSICAL FACTORS 1. Heavy precipitation – leads to flash floods as the river channel cannot contain the volume of water. 2. Geology – impermeable rocks (shale/clay) prevents water soaking through so it remains on the surface and directs the water to the river. 3.Relief– steep slopes/mountainous environments causes the water to runoff the surface into the river. HUMAN FACTORS Urbanisation – building on a floodplain creates impermeable surfaces (tarmac roads) means water cannot infiltrate into the ground. Drains can also block. Deforestation – reduces the amount of evapotranspiration so is more water on the surface and in the river channel. Agriculture – loose soil is moved into rivers through surface runoff.
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