krajolici: me udjelovanje tektonike i klimergn.hr/~dpavelic/og-web-pdf/og17 - krajolici...189 oblici...
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KRAJOLICI: MEĐUDJELOVANJE TEKTONIKE I KLIME
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Krajolik je kontroliran sustavom Zemlje: stijenskim ciklusom -magmatizam, metamorfizam, zagrijavanje, precipitacija, trošenje i erozija, taloženje, zatim klimom, oceanskom cirkulacijom, evaporacijom, vanjskim izvorom topline (solarna energija).
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• promatranje utjecaja glavnih geoloških sila: geološka povijest, tektonika, klima, trošenje, erozija i sedimentacija
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Oblici na Zemlji:
• karakteristične forme krajolika koje su se formirale procesima erozije i sedimentacije
- planine i brda- platoi- strukturno kontrolirani klifovi- strukturno kontrolirani hrbtovi i doline- riječne doline- tektonske doline
• topografske karte
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Nazivlje
• topografija:
• nadmorska visina (elevacija):
• izohipse:
• reljef:
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Topografska karta vrha
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Topografska karta doline
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Digitalna elevacijska karta
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Karta padina
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Vrste reljefapadinski reljef:
reljef glavnog kanala:
pritočni
reljef
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Topografske karte najviših i najnižih elevacija na Zemlji
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Karta i pogled pod kutem na plato Tibeta*, koji je najviši i najširi na Zemlji
• plato:
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Mesa u dolini Monument, Arizona
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•• kuestikuesti:
pješčenjak otporan na eroziju
lako erozioni šejl
Strukturno kontrolirani klifovi
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"hogbacks":
Strukturno kontrolirani klifovi
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• topografija hrbtova i dolina boranih sedimentnih stijena - Zagros gorje (Iran)
Strukturno kontrolirani hrbtovi i doline:
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Stadiji razvoja hrbtova i dolina u
boranim planinama
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Valley and Ridge (Dolina i hrbat) provincija u Apalačima
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a) Rani stadij boranja: hrbtovi na antiklinalama, tokovi na sinklinalama.b) Kasni stadij erozije: hrbtovi prekrivaju osi sinklinala ako su izgrađeni od otpornih stijena.
a) b)
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Erozija je kontrolirana balansom između snage toka i otpornosti prema eroziji
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otpornost prema
eroziji se povećava s
povećanom veličinom
zrna, volumenom
sedimenta i čvrstoćom
temeljne stijene
erozija se povećava s
povećanom snagom
toka, koja se
povećava s nagibom
padine i otjecanjem
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rezultat je mrežna erozija dolina
Prevladava erozija
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rezultat je balansizmeđu erozije i taloženja
Otpornost i erozija ujednačeni
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rezultat je mrežno taloženje i punjenje dolina sedimentom
Prevladava otpornost
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Utjecaj erozije: izdizanje potiče eroziju
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Utjecaj erozije: izostatski odskok potiče izdizanje
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Klasičan model razvoja krajolika
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Davisova teorija razvoja krajolika
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Penckova teorija razvoja krajolika
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Hackova teorija razvoja krajolika
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Metode apsolutnog datiranja krajolika
• mjerenje odnosa izdizanja i erozije
planina
• datiranje:
• datiranje temeljeno na činjenici da su
nuklearne reakcije potaknute svemirskim zračenjem koje probija vršni metar stijene ili tla
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