432a setete transport
TRANSCRIPT
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432a Setete transport
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Rannikumere hüdrodünaamika
Lained
411 Lainete kirjeldus
412 Laineteooria
413 Looded
Tuuled
421 Atmosfääri mõju
422 Tormiaju
423 Lainekliima
Seted431 Setete liigid
432 Setete transport
433 Rannaprofiil
Rajatised
441 Looduslikud rajatised
442 Ehitised
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432a Ülevaade
Transpordi liigid
Settevoolu tunnused
Aastane setete transport
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432a Õpiväljundid
Teadmised○ mis on setete
transport, ühikud
○ transpordi tunnused
Oskused○ arvutada aastanemaht
○ määrata rannajoone
kuju○ määrata setete
liikumise suund
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432a Kirjanduse loetelu
Dominic Reeve, Andrew Chadwick. Coastal engineering:processes, theory and design practice. §5.2, 6
Waves, tides and shallow-water processes. Preparedby an Open University Course Team. §4, 5
Robert G. Dean, Robert A. Dalrymple. Coastal processes:with engineering applications. §8
R. Carter. Coastal environments: an introduction to
the physical, ecological and cultural systems of coastlines. §
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Osakese liikumise füüsika
Hõljumine (suspension)
Veeremine (bedload)
Hüplik hõljumine (saltation)
Kriitiline kiirus
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Kriitiline kiirus
Liikumine sõltub tera suurusest, voolukiirusest, üleslükkejõust
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Setete transpordi tunnused
erosioon või kuhjumine struktuuri juureskuhjumine väikeste struktuuride taha
kuhjumine neemede, maaninade juures
maasääre kasvamise suund
liivaranna laius
luidete kõrgus
jõesuudme kõrvalekalle
liivaterakeste suuruste muutmine piki randaraskmetallide analüüs
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Näide
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Näide
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Näide
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Näide
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Füüsikaline mudel
rjkhlk
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Transport risti randa
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Shieldsi parameeter - θ
jõudude suhe
tihedused - setteosakese ja vee
d - läbimõõt
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Shieldsi parameeter - θ
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Näide
Liiv 0.5 mm, kiirus 50 cm/s, z0=5cm, h=2 m.
Leida Shieldsi parameeter
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Näide
Liiv 0.5 mm, kiirus 50 cm/s, z0=5cm,
Leida Shieldsi parameeter
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Näide
Liiv 0.5 mm, kiirus 50 cm/s, z0=5cm,
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Aastane netotransport
QLS
– tranport piki randa
(longshore) (m3
/aasta)H
s– oluline lainekõrgus (m)
Tp – tipplaine periood (s) β – ranna kalleθ – laine langemisnurk rannanormaali suhtes
d50 – mediaandiameeter (m)
Ranna kalle
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Näide
Ranna pikkus on 500 m, sulgemissügavus on 4 m,lained, mille oluline lainekõrgus on 2,5m ja 2,8m tulevad loodest ja kagust (30% ja 60%), perioodigavastavalt 5 ja 7 sek. Mediaandiameeter on 0.2 mm.
Kui suur on netotransport ja mis suunas?
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Lahendus
Ranna pikkus on 500 m, sulgemissügavus on 4 m,lained, mille oluline lainekõrgus on 2,5m ja 2,8mtulevad loodest ja kagust (30% ja 60%), perioodigavastavalt 5 ja 7 sek. Mediaandiameeter on 0.2 mm.
Kui suur on netotransport ja mis suunas?
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Lahendus
Netotranspordi arvutamiseks on vaja leida setetetransport loodesuunas ja eraldi kagusuunas. Nendevahe on netotransport.
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Lahendus
Netotranspordi arvutamiseks on vaja leida setetetransport loodesuunas ja eraldi kagusuunas. Nendevahe on netotransport.
Loodest kagusse = 528 500 m3 /aatas
Kagust loodesse = 1 098 000 m3
/aatas
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Lahendus
Juhul, kui 100% aastats oleks sama tuulerežiim, siistransport oleks selline. Aga, loodest on ainult 30%, järelikult:
0,3*528 500 = 158 500 m3 /aatas
Kagust loodesse 0,6*1 098 000 = 658 800m3 /aatas
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Lahendus
Netotransport onkagust loodesse 658 tuh m3 /a
miinus 158,5 tuh m3 /a
= 500300 m3 /aastas