SIO 15 Lecture Notes - Lecture 23: Longshore Drift, Beach Nourishment, Dust Bowl
19 Dec 2018
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Document Summary
Sio leture 23 coal burning in north america, natural drought conditions, and local slash-and-burn farming contributed to the devastating famine in the sahel in the 1970s. Dust storms transport toxins and pathogens across oceans. Dust bowl: u. s. 1930 drought and resulting soil erosion. Human contribution to desertification: slash-and-burning, overpopulation, overgrazing, deforestation. Dust storms can transport pathogens a few thousand km and can cross oceans within a matter of days. Plants had highest fraction of threatened species. Beach walk length of fault = maximum size of eq largest in sd was 6. 5m in 1800 inner bank: less steep, slower flow speed, deposition and sedimentation, flood plains (liquefaction) Protecting cliffs: sea walls, fixing leaky pipes, more plants (native and deep-root), put rocks to prevent undercutting, replenish beach with sand, anchor the buildings. Weak cliffs: glide horizon, faults, wave undercutting, sparse vegetation, earthquakes can trigger cliff failures, occasional heavy rains in winter season accelerate erosion.
