Where/what is it? Management: Mississippi is 3800km long 6 huge dams and 105 reservoirs Flows through ten states Afforestation to delay runoff Has over 100 tributaries Strengthening the levees with concrete mattresses Has a drainage covering 1/3 of the USA 25mx8m Making the course shorter and straighter - from 530km to Causes of 1993 flooding: 300km by cutting through the neck of meanders to get the Heavy rain in April 1993 saturated the upper Mississippi water passed towns more quickly to the sea basin Diversionary spillways overflow channels 9km long – Thunderstorms in June caused flashfloods Less construction on the floodplain e.g. St Louis. Mid July 180mm of rain in one day Levees in nearby towns collapsed Little task for you …. Unit 2.2.3 Marine Processes Where land meets the sea Fetch: the distance the wind has travelled over the sea the longer the fetch the bigger the waves – Constructive waves: swash is stronger than backwash causing deposition Destructive waves: backwash is stronger than swash causing erosion Marine transport: Suspension Solution Traction Saltation Fine sediment carried Dissolved material Large pebbles and Small pebbles hitting in the water carried in the stones rolling along sea one another and bed bouncing along the sea bed Marine erosion: Hydraulic action Air forced between cracks on rocks Corrosion Sea water dissolving parts of rocks
Where/what is it? Mississippi is 3800km long Flows through ten states Has over 100 tributaries Has a drainage covering 1/3 of the USA Causes of 1993 flooding: Heavy rain in April 1993 saturated the upper Mississippi basin Thunderstorms in June caused flashfloods Mid July 180mm of rain in one day Levees in nearby towns collapsed Management: 6 huge dams and 105 reservoirs Afforestation to delay runoff Strengthening the levees with concrete mattresses 25mx8m Making the course shorter and straighter - from 530km to 300km by cutting through the neck of meanders to get the water passed towns more quickly to the sea Diversionary spillways – overflow channels 9km long Less construction on the floodplain e.g. St Louis. Little task for you …. Unit 2.2.3 Marine Processes Where land meets the sea Fetch: the distance the wind has travelled over the sea – the longer the fetch the bigger the waves Constructive waves: swash is stronger than backwash causing deposition Destructive waves: backwash is stronger than swash causing erosion Marine transport: Suspension Solution Traction Saltation Fine sediment carried in the water Dissolved material carried in the Large pebbles and stones rolling along sea bed Small pebbles hitting one another and bouncing along the sea bed Marine erosion: Hydraulic action Air forced between cracks on rocks Corrosion Sea water dissolving parts of rocks