{"id":938,"date":"2004-12-03T09:34:00","date_gmt":"2004-12-03T08:34:00","guid":{"rendered":"https:\/\/kids.esa.int\/rivers\/"},"modified":"2026-10-08T00:33:59","modified_gmt":"2026-10-07T22:33:59","slug":"rivers","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fi\/rivers\/","title":{"rendered":"Joet"},"content":{"rendered":"
\n

Suurin osa maailman v\u00e4est\u00f6st\u00e4 asuu jokien l\u00e4heisyydess\u00e4. He ovat riippuvaisia joista juomaveden hankkimisessa, pesemisess\u00e4, kalastuksessa ja viljelysten kastelussa.<\/p>\n<\/div>\n

Syrj\u00e4isiss\u00e4 metsiss\u00e4 tai aavikoilla joet voivat olla helpoin matkustustapa. Patoja voidaan rakentaa tulvien est\u00e4miseksi, l\u00e4heisten peltojen kastelemiseksi tai s\u00e4hk\u00f6n tuottamiseksi.<\/p>\n

Jos jokia ei pidet\u00e4 kurissa, kuivuus tai tulvat voivat aiheuttaa katastrofeja. Joka vuosi miljoonat ihmiset k\u00e4rsiv\u00e4t vesipulasta tai siit\u00e4, ett\u00e4 heid\u00e4n kotinsa ja pellonsa tulvivat.<\/p>\n

Jopa Euroopassa suurten jokien tulvat uhkaavat ihmishenki\u00e4 ja aiheuttavat valtavia vahinkoja kaupungeille ja viljelymaille. Vuonna 2002 Euroopan pahimmat tulvat moniin vuosiin aiheuttivat yli 7 miljardin euron vahingot.<\/p>\n

Meteosat-s\u00e4\u00e4satelliitit antavat varhaisvaroituksen voimakkaista sateista, jotta tulvasuojaukset voidaan valmistella. ESA:n Envisat- ja ERS-2-avaruusalukset auttavat pelastuspalveluja kuvaamalla tulvialueita sek\u00e4 p\u00e4iv\u00e4ll\u00e4 ett\u00e4 y\u00f6ll\u00e4.<\/p>\n

\"Water<\/figure>\n

Satelliittikuvien avulla voidaan my\u00f6s selvitt\u00e4\u00e4, mitk\u00e4 ovat parhaat paikat kaivojen kaivamiseen, kuinka paljon vett\u00e4 maaper\u00e4ss\u00e4 on ja nousevatko vai laskevatko jokien vedenpinnat. T\u00e4st\u00e4 on suurta hy\u00f6ty\u00e4 k\u00f6yhiss\u00e4 maissa, joissa t\u00e4llaisia tietoja on vaikea saada.<\/p>\n

Vuodesta 2002 l\u00e4htien ESAn TIGER-ohjelma on auttanut monia Afrikan maita seuraamaan jokiensa ja kosteikkojensa tilaa sek\u00e4 hy\u00f6dynt\u00e4m\u00e4\u00e4n k\u00e4ytett\u00e4viss\u00e4 olevia vesivarojaan mahdollisimman tehokkaasti.<\/p>","protected":false},"excerpt":{"rendered":"

Most of the world\u2019s population live near rivers. They depend on rivers for drinking, washing, fishing and watering crops. In remote forests or deserts, rivers may be the easiest way […]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"esa_banner_image":"https:\/\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/images\/2003\/08\/water_flows_through_dam_diversion_holes2\/18249990-2-eng-GB\/Water_flows_through_dam_diversion_holes.jpg","esa_banner_description":"","esa_banner_credit":"Associated Press, XINHUA","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2003\/08\/Water_flows_through_dam_diversion_holes2","esa_external_url":"","esa_external_new_window":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":true},"categories":[42,10,66],"tags":[2],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-938","post","type-post","status-publish","format-standard","hentry","category-earth","category-learn","category-water-world","tag-background-article"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/938","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/comments?post=938"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/938\/revisions"}],"predecessor-version":[{"id":4748,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/938\/revisions\/4748"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=938"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=938"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=938"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=938"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=938"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=938"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=938"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=938"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=938"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=938"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}