{"id":7880,"date":"2016-06-21T17:19:22","date_gmt":"2016-06-21T15:19:22","guid":{"rendered":"https:\/\/cerranobike.it\/la-genesi-dei-calanchi-di-atri-seconda-parte\/"},"modified":"2026-10-06T20:43:12","modified_gmt":"2026-10-06T18:43:12","slug":"la-genesi-dei-calanchi-di-atri-seconda-parte","status":"publish","type":"post","link":"https:\/\/cerranobike.it\/en\/la-genesi-dei-calanchi-di-atri-seconda-parte\/","title":{"rendered":"La genesi dei calanchi di Atri (seconda parte)"},"content":{"rendered":"<p>Senza entrare troppo nel particolare possiamo comunque riassumere e generalizzare sostenendo che i calanchi sono un fenomeno geomorfologico erosivo tipico del clima mediterraneo con lunghe estati secche e forti piogge concentrate in determinati periodi dell\u2019anno. Perch\u00e9 si formi un calanco sono necessarie condizioni naturali e antropiche: terreno prevalentemente argilloso ma con una certa percentuale di sabbia, pendenza elevata, esposizione preferibilmente a sud, clima caratterizzato dall\u2019alternarsi di fenomeni temporaleschi e stagioni secche e, naturalmente, assenza di copertura vegetale. Quando viene bagnato dalle piogge, il terreno argilloso si comporta da spugna e le particelle cariche di acqua ingrossandosi fanno diventare il suolo argilloso viscido e facilmente modellabile. Una volta asciugato dal sole, il suolo presenta un aspetto secco e pulverulento con numerose crepe e fessure sulla superficie. Solitamente questo primo strato, a causa della rapida evotraspirazione, si \u201cscolla\u201d dalle pareti e, alle successive piogge, viene preso in carico dalle acque e trascinato sul fondovalle nelle ordinarie colate fangose. Innumerevoli rigagnoli iniziano quindi a formarsi sui terreni e sulle argille e con lo scorrere delle acque si approfondiscono sempre di piu\u0300, aiutati infine dalla forza di gravita\u0300 scavano e disegnando un fitto reticolo idrografico in miniatura con vallecole dai fianchi ripidissimi. Le particelle erose, piccole e leggere, ma anche i grossi blocchi staccatisi dai versanti, si accumulano insieme agli innumerevoli fossili contenuti nelle argille, alla base del calanco e da li\u0300 vengono trasportati dai corsi d\u2019acqua fino al mare. Nella parte alta, denominata corona, il fenomeno e\u0300 ancor piu\u0300 percettibile all\u2019osservatore. Avanzando a ritroso infatti, l\u2019erosione produce continue nicchie di distacco sui suoli di margine e successive frane, crolli e colamenti, mettono a nudo lo scheletro argilloso sottostante, innescando la riattivazione e la genesi di neo-fomazioni calanchive denominate localmente, \u201cli ripe\u201d o \u201cli scrimun\u201d, ma che a noi piace chiamare \u201cunghiate del diavolo\u201d.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Senza entrare troppo nel particolare possiamo comunque riassumere e generalizzare sostenendo che i calanchi sono un fenomeno geomorfologico erosivo tipico del clima mediterraneo con lunghe estati secche e forti piogge [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_citadela_custom_class":"","footnotes":""},"categories":[577],"tags":[632,634,640],"citadela-post-location":[],"class_list":["post-7880","post","type-post","status-publish","format-standard","hentry","category-nature","tag-atri-en","tag-calanchi-en","tag-wwf-en"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - 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