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Zonas glaciares y periglaciares

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El relieve de las zonas glaciares y periglaciares en la montaña.

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Zonas glaciares y periglaciares

  1. 1. SISTEMA MORFOCLIMÁTICO DE ZONAS GLACIARES Y PERIGLACIARES Condiciones climáticas Zonas glaciares Zonas periglaciares Nieves perpetuas que se acumulan y se transforman en hielo Frecuentes fenómenos de hielo-deshielo Vegetación Zonas glaciares Zonas periglaciares Ausente Muy escasa. Musgos y líquenes Agentes Zonas glaciares Zonas periglaciares Glaciares Gelifracción provocada por el hielo - deshielo Formas de relieveZonas glaciares Zonas periglaciares Picos o horn, circos, morrenas y valles en “U” Canchales, suelos poligonales…
  2. 2. CASQUETES POLARES Glaciares: son grandes masas de hielo que se forman al compactarse la nieve. GLACIARES DE MONTAÑA dos tipos:
  3. 3. El agua de nuestro planeta 97% 3% OCÉANOS (97%) AGUA DULCE (3%)
  4. 4. El agua dulce AGUA SUBTERRÁNEA (20%) AGUA DE SUPERFICIE (1%) Sólo el 0,01% para consumo humano La mayor parte del agua dulce es hielo 79% HIELO
  5. 5. CASQUETES POLARES (HIELO) Círculo polar Ártico Círculo polar Antártico También se les llama glaciares de casquete Groenlandia
  6. 6. El continente Antártico está cubierto de hielo. Este hielo se formó por la compactación de la nieve. Fotografiado desde el espacio.
  7. 7. Antártida: en algunos lugares el hielo tiene más de 2000 metros de espesor.
  8. 8. ICEBERG Tierra firme cubierta de hielo acumulado durante miles de años de nevadas De ella se desprenden los iceberg, que son enormes bloques que van flotando en el mar
  9. 9. Parte que emerge Parte sumergida del iceberg
  10. 10. Glaciar alpino o de montaña Lengua glaciar
  11. 11. Glaciares de montaña Aquí el hielo se derrite y deja depósitos llamados morrenas Aquí el hielo con piedras araña las paredes del valle La nieve se compacta hasta formar hielo Las avalanchas llevan nieve y rocas hacia abajo Circo glaciar Lengua glaciar Horn
  12. 12. HornHorn “Nacimiento” o Circo glaciar
  13. 13. Laguna circular de origen glaciar (antiguo circo glaciar) Laguna de La Caldera – Sierra Nevada, Granada
  14. 14. Perfil de un antiguo valle glaciar Perfil de un valle fluvial En “U” En “V”
  15. 15. Un antiguo valle glaciar Perfil en “U” Un valle fluvial Perfil en “V”
  16. 16. Valle glaciar Morrenas
  17. 17. El agua entra en lasEl agua entra en las grietas de las rocasgrietas de las rocas Acción del hielo – deshielo: GELIFRACCIÓN o efecto de cuña Sistema morfoclimático de zonas periglaciares
  18. 18. Cuando el agua se congelaCuando el agua se congela aumenta su volumen…aumenta su volumen…
  19. 19. …… el hielo presiona la roca, queel hielo presiona la roca, que va agrietándose y rompiéndoseva agrietándose y rompiéndose
  20. 20. Poco a poco la roca tienePoco a poco la roca tiene más grietas, por donde vamás grietas, por donde va colándose el aguacolándose el agua
  21. 21. Más heladas provocaránMás heladas provocarán poco a poco que las rocaspoco a poco que las rocas se rompanse rompan
  22. 22. Todos estos fragmentos de rocas se hanTodos estos fragmentos de rocas se han formado por la acción del hielo - deshieloformado por la acción del hielo - deshielo Canchal o pedriza
  23. 23. La acción del hielo - deshielo esLa acción del hielo - deshielo es un ejemplo de meteorización físicaun ejemplo de meteorización física
  24. 24. La acción del hielo - deshielo es muyLa acción del hielo - deshielo es muy importante en altas montañasimportante en altas montañas
  25. 25. Cordillera blanca (Perú)
  26. 26. Circo glaciar
  27. 27. Erosión vertical
  28. 28. Glaciar del Alpamayo (Perú)
  29. 29. Cervino (Italia)
  30. 30. Valle glaciar
  31. 31. Morrenas
  32. 32. Valle glaciar
  33. 33. Valle de Lunada
  34. 34. Horn-Machapuchare (Nepal)
  35. 35. Ladakh (India)
  36. 36. Monte Kenia
  37. 37. Glaciar Lewis (Monte Kenia)
  38. 38. Calentamiento(Islandia)
  39. 39. Calentamiento(Islandia)

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