GEOS 212 1st Edition Lecture 16Outline 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 depositsOutline 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 processesCurrent
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