Geography 2071F/G Final: Geography World Rivers - Final Exam Review Notes
14 Apr 2012
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Discharge=219. 000 m3/sec (amazon=20% of all river discharge) ganges=4%, congo=4% Basin: 70% of basin in brazil, tocantins basin (part of basin) at mouth is big island (marajo) (tocantin basin goes south of the island) amazon goes north. Sediment: river drops from andes quickly & carries sediment. When it goes to flat area, some of the sediment drops out, natural extension zone (where sediment drops off) , river turns brown because of sediment that is picked up as it runs off from high in the mountains. Flood plains deposit sediment elsewhere medeira brings large amounts of sediment (aka sediment doubles when it hits the madeira) most of the sediment comes from andes & madeira. Clear water rivers: low sediment and nutrient load. **when rivers meet you can get big mixing effects (rio negro & amazon). Takes about 10km before waters fully milk (riomadeira) river level is lowest in junejuly fluctuations in river levels: greatest fluctuations are in southwestern.
