Coastal processes blog erosion

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coastal processes - erosion, transportation, deposition

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  • Destructive : erosion occurring, destroying coastline Constructive : depositions of sediments
  • Factors that will determine the type of wave to be constructive or destructive
  • How did the boats got here? What causes tides? What types of tides do you know? Definitions High and low tide Erosion
  • CASH ( impact of waves, materials, chemical reaction) Eg:washing dirty shoes
  • mineral composition dissolved : limestone Soft rock: clay Hard rock: granite
  • Give out vanguard sheet and markers
  • Eg pebbles and gravel Scouring- scrub effect Chisel- cutting and shaping
  • Eg limestone
  • from rivers and coastal erosion
  • Coastal processes blog erosion

    1. 1. 1
    2. 2. Q: Are tsunamis considered asdestructive or constructivewaves? 2
    3. 3. Q: Are tsunamis considered as destructive or constructive waves? Issues: wave frequency? no backwash? gentle slope or sheltered coast? Destructive: - high wave height/ plunging breakers- erosion process more prominent - transports eroded sediments away 3
    4. 4. Text pg Tides 91 • Rising and falling of the sea level • Cause : pull of the moon & sun, rotation of the earth • Each coastal area receive two high tides and two low tides daily 4
    5. 5. W ic a a n h bah t h h r o t ec ish e e e Tides m spoe oe s n ot rn t r io? o Aes ra bten e e w high and low te ids hv m r ae oe e sn r io o 5
    6. 6. 6
    7. 7. LSON OB C I ES JTE E V• Todescribe and explain the 4 coastal erosion processes• D escribe what a longshore drift is ( time?) 7
    8. 8. 3 OA T L R ESS Erosion C orrasion C SA P OC SE A brasion Solution H ydraulic action T ransport Longshore drift D eposition Fc r at s o: -Supply of sediment -G radient of slope -C oast position 8
    9. 9. C SA E OS OA T L R I ONTxp 9 et g 2 More erosion Less erosionTypes of waves - et c e ae - osute ae D sut wvs C nt c wvs r iv r iv ( oe nr ) m r ee y g (es nr ) l ee y s gStructure and -N mru le o -N c cs u e s sf o rk o in acomposition of wans ekes -H r rcs a ok dcoastal rocks -Sfrcs o ok tPosition of the -Opn os e cat -Poet ad rt e n cdcoast see d y hlr b te 9 sut e tc r r us
    10. 10. G OU W K R P OR• Ec g u t r e e ah r p o e iv o coe aga setn 4 n vnur he ad dmr r ae ks• W ilwitgt hn u he ain, o ad phmwrinrno e ok f t o• T oe ht a nt hs t hs o acmle, t s y ako p t o t bc ed adrgeeso o uin r st d . c 1 0
    11. 11. G OU W K R P OR• D etermine which erosion process has created this coast : C orrasion/ A ttrition/ Solution/ H ydraulic action• W rite down the characteristics and traits of the coastal features• Explain how the erosion process occur• T extbook time• T eacher time 1 1
    12. 12. C R S /B A I OR A I A R S ON ON • Ipco t mt ia c rd mat fh a rl a ie e e s r b t wvsc p g gint yh ae s ain aa s e r t ca ( g 3 h os p 9) e t • T r l c o t cr n ub e e fh ur t un e es po ue s uin eet rdc a c rg fc o f • C islg fc/rd g hein eet g in l f in atn n h ca c o t os io e t • C t g n b ain t rc u in ad r k gh ok t e e s o t ca s n h os e t 1 2
    13. 13. A T ION TR I T• R csu o h aa sec ok rb r itgint ah ohr r k d w in s a t , be s o n t ml e a o l rud m oh iee( g 3 on s o t p cs 9) p• Mt ia f m h wvs a rl r t ae e so e cl e it mt ia o t oid wh a rl n h l e s e ca ost• Ipccue mt ia t matass a rl o e s bek t s a r iee r in ml p cs a o l e wic bcmsad h h eo e sn 1 3
    14. 14. SM A Y U MR• A s e d t et us n b u dsute nwr s dn qet aot et c e u io r ivad osute aen cnt c wvs r iv• D fitn f ids e io o T e in• D s ib t ca c rts f ca ae s n ec e h hr t is o 4 os lr ioa r e a e ic t opoes A H rcs C S :• Ep ind o t p cs s c r xl e hwh r es oc s a e o e u 1 4
    15. 15. S U I /OR OSOL TON C R ION • W vsecce icl wh ae r thm a it a ly sl lm e l t rcs o b inrs h ok ue a in e ad is l t m p 9) n ds v h ( g 3 oe e • C r s n fok b or io o rcs y o sa a r ewt e • W v atn c a sh r e ae c inr s t a io ee e t o r c n ye oin t fe t b r v gh a io m e r c d hm aslio e t ce icl u n ae ot • E l etn gims e o 1 5
    16. 16. H E OR A S E S OMW K N W R ON BOG L 1 6
    17. 17. HDAL AT Y R UI C I C ON• D et pco t wvs ginth ir imat fh ae aa st c e e ca . C mr s irn ee os o pe a ad xr t s t pesr in h c cs fok ( g 2 r ue t r k o rcsp 9) s e a• Elgsins f ekess fr n r le o wans ae ae e t r et c se o wvs e a d r hs f ae p e a• C avitation: wt sr s t c cs a rug in r k e e o a , j t f l. R sl in o pesd ir o s a t eus cmr e a in , us t s ad ud pesr W t r r t n bil r ue a re e s s . e ta ress r sr ad r pd ir e a pe ue n t pe a l e s a wic bek t rc u. h h r sh ok p a e 1 7
    18. 18. L GH E RTON S OR D I F 1 8
    19. 19. Coasts are shaped by ... Text pg Currents 189• Large scale movement of water in the ocean driven by wind• Longshore current: flow parallel to a coast ( form by waves approaching at an oblique angle) 1 9
    20. 20. OL eg 20 P Q4 G o N 04 2 QUZ IU sing a labelled diagram, describe the process of longshore drift [ 4] 2 0
    21. 21. P 9 G 3 C SA T A SOR A I OA T L R N P T TON• Longshore drift: wvsr soteimn a n t ca ae t np rsd etl gh os a o e t• Longshore drift: beach drift + longshore current• W v apoc ca aa ag : S a cr s a rl o lu ae prah os tn nl ws a ie mt ia in b e t e h r e s iq ag nle• Bcws cr s a rl e ed u r d w bcue fr it ak a a ie mt ia pr nicll o n eas o g vy h r e s p ay a• Z zg oe et ec dif sd etm v g l g ec) iga m vmn bah r ( eimn oin a n bah : t s o 2 1
    22. 22. LO N G SH O RE D RIFT 2 2
    23. 23. ( beach drift) Longshore currentDA R M L G H E IG A OF ON S OR DI RT F 2 3
    24. 24. U in aaee d g mds ib t poes sg l ld iar , ec e h rcs bl a r e o l g oe r [ ] f ns r dif 4 o h t• W aves reach the coast at an oblique angle creates a longshore current• T he materials move in a zigzag pattern in a down drift direction ( beach drift)• T he swash carries materials up the beach at the same angle as when the war approaches the shore• A s the swash dies away, the backwash and any materials carries by it return straight down the beach at right angles to the water line due to gravity.• Longshore drift = beach drift + longshore current 2 4
    25. 25. C SA D P ION OA T L EOS I T More Less P9 g4 deposition deposition W a wv ee y ek ae nr g Supply of S og ae nr t n wv ee y r g E cnt c e g osut r iv sediment e dsute ae g et c wvs r iv wvs ae G ne g d n etrr iet l aG radient of r ue wv ee y S e g d n e cs ae nr d g t p r iet e a slope bcue f ic n eas o f t r io C l cs l a ot m aPosition of cnitn/ rt t odiospoe ecd Opn os e ca s t the coast by as 2 5

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