GEOS 212 1st Edition Lecture 16 Outline of Last Lecture LECTURE 15 OUTLINE Coastal Processes Wave patterns along shore how drive longshore transport longshore currents waves parallel to shore versus at an angle Role of Longshore Transport LT in sediment cycle Movie of longshore transport Beach river of sand o Submarine canyons seawalls jetties groins impact sand transport Global pattern of LT o LT in Ideal World from Storm Latitudes toward Equator in both hemispheres e g to South in Northern hemisphere to North in Southern hemisphere o LR in Real World mostly consistent but more complicated Problems caused by dams concrete lined channels coastal erosion need to supply sand Longshore transport along a curvy coastline and coastal straightening o Headland erosion and beach deposits Outline of Current Lecture LECTURE 16 OUTLINE Density currents Review of longshore currents transport Review of coastline processes from wave action erosion longshore transport deposition Shoreline Straightening Upwelling downwelling from onshore offshore wind Upwelling downwelling waves longshore transport water temp and fishing on an island These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute Global patterns of upwelling downwelling and marine productivity map info Density currents 1 up at the equator from sun heat down at high latitudes turns in 100 years 2 Seasonal up in summer hemisphere down in winter hemisphere o Driven largely by formation of ice sheets o Produces upwelling big affect on life and migration patterns o Very slow 100 year rate but never turns in complete circle 3 Conveyor Belt current important for mixing of oceans turns in 1000 years Mixing time of the oceans main processes Current Lecture
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