Río Colorado
Transcript of Río Colorado
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María Pérez Fernández IES Francisco Asorey
Xuño 2013
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LONXITUDE: 2.333 km
PAÍSES: Estados Unidos, México
SUPERFICIE DA CUNCA:
629.100 km2
GRAN CONCA
MESETA DO COLORADO
MO
NTAÑ
AS ROCHO
SAS
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CLIMADe montaña no curso superior e desértico e semiárido no resto
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● CAUDAL: 620 m2 (medio)● TIPO DE RÉXIME: nivo-pluvial no curso superior
(máximos en xuño e mínimos en decembro-xaneiro). En realidade, as augas importantes do río proveñen da fusión da neve xa que as precipitacións ao longo do seu curso son moi pouco importantes. Sufre moi profundas estiaxes no verán.
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NACEMENTO: Montañas Rochosas (Colorado, USA) a 3.111 m de altitude.
GRANBY
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Dolores
Gunnison
GRAND JUNCTION
P. N. OS ARCOS
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Verde
San Juan
MOAB
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Lago PowellAntílope
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Pequeno Colorado
PAGE
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GRAND CANYON
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GRAN CANÓN
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Lago Mead
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BULLHEAD CITY
LAKE HAVASU CITY
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YUMA
Hardy SAN LUÍS DE RÍO COLORADO
Gila PHOENIX
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DESEMBOCADURA: Golfo de California (México)Océano Pacífico
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XEOLOXÍAO río Colorado e os seus afluentes discorren en boa parte por desertos e terreos sedimentarios nos que escavaron canóns, arcos e curiosas formas de gran interese xeolóxico. Na desembocadura forma un gran delta a carón do deserto con extensos areais.
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Gran Canón do Colorado, no estado de Arizona.
Un canón de 446 km e máis de 1.600 m de altura excavado durante 2.000 millóns de anos nas rochas sedimentarias (xistos, calcárias, areíscas…) da meseta de Colorado que se foi elevando desde hai 65 millóns de anos.
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Canón do Havasu
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FLORA● Nas zonas de montaña: carballos, pradairos, caobas
de montaña. ● Nas zonas semiáridas hai artemisa, salvia,
xenebreiros... No deserto hai iucas e cactos.● A carón do río especies de ribeira.
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FAUNA● Nas zonas de montaña: osos negros, pumas... ● Na zona cha: rata canguro, raposo, coiote, gato bravo...
Puma Rata Canguro
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Tartaruga do deserto, en vías de extinción trala súa loita, perdida, contra o gando.
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Os ríos da conca do Colorado acollían 49 especies de peixes (42 endemismos). Algús extinguíronse e outros están en grave risco (matalote, carpa xigante do Colorado, carpa xorobada)
Matalote
Carpa xigante do Colorado
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APROVEITAMENTO● Subministro de auga ás cidades, regadío e industrias,
deportes, lecer, turismo, enerxía hidroeléctrica (presas Glen Canyon, Hoover, Parker e Davis (Estados Unidos), e Morelos (México).
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Zonas de regadío das ribeiras do río Colorado
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ESPAZOS PROTEXIDOS● Alto Golfo de California e
delta do río Colorado.● Parque Nacional
Cayonlands (Utah)● Gold Butte Area of Critical
Environmental Concern● Lake Mead National
Recreation Area
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● Lake Mead National Recreation Area
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DATOS HISTÓRICOS● Os primeiros poboadores da
conca do río Colorado eran paleoindios das culturas Clovis e Folsom establecidos na Meseta de Colorado hai uns 12.000 anos. Na actualidade aínda viven tribus amerindias na cunca do Colorado.
● O primeiro europeo que explorou o Golfo de California e descubriu a desembocadura do río Colorado foi o navegante Francisco de Ulloa (1539).
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CURIOSIDADES Os conquistadores españois exploraron o río Colorado
na busca das setes cidades de ouro do reino de Cíbola.
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PROBLEMAS A sobreexplotación do río fai
que case non chegue auga á desembocadura.
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Laura Domínguez Otero IES Francisco Asorey
María Pérez FernándezAdela Leiro, Chus García