{"id":664,"date":"2023-07-06T14:12:32","date_gmt":"2023-07-06T14:12:32","guid":{"rendered":"https:\/\/westwalesriverstrust.org\/adfer-afonydd\/"},"modified":"2023-07-11T10:04:53","modified_gmt":"2023-07-11T10:04:53","slug":"adfer-afonydd","status":"publish","type":"page","link":"https:\/\/westwalesriverstrust.org\/cy\/adfer-afonydd\/","title":{"rendered":"Adfer Afonydd"},"content":{"rendered":"<p>[et_pb_section fb_built=&#8221;1&#8243; _builder_version=&#8221;4.19.1&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;0px||0px|||&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_row _builder_version=&#8221;4.20.2&#8243; _module_preset=&#8221;default&#8221; width=&#8221;100%&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.19.1&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_text _builder_version=&#8221;4.21.0&#8243; _module_preset=&#8221;default&#8221; animation_style=&#8221;fade&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;]<\/p>\n<p>Amcangyfrifir bod dros 90% o&#8217;n hafonydd yn y DU wedi cael eu haddasu gan bobl drwy arferion megis sythu, g\u00f4r-ehangu, carthu, draenio gorlifdiroedd ac ychwanegu rhwystrau mewn afonydd. Mae&#8217;r addasiadau hyn i gyd yn effeithio ar brosesau naturiol ac felly maent yn niweidiol i iechyd a bioamrywiaeth afonydd.<\/p>\n<p>Mae adfer afonydd yn cyfeirio at sawl gweithgaredd gwahanol sy&#8217;n adfer cyflwr a swyddogaeth naturiol afon.\u00a0\u00a0Mae Ymddiriedolaeth Afonydd Gorllewin Cymru yn chwilio yn rheolaidd am gyfleoedd i adfer llwybrau naturiol afonydd drwy gael gwared ar rwystrau (gweler isod) neu drwy &#8216;ail-ddolennu&#8217; a\/neu ailgysylltu gorlifdiroedd lle nad yw tir yn cael ei ddatblygu neu o werth amaethyddol isel. Lle nad yw cyfyngiadau yn caniat\u00e1u hyn, rydym yn ceisio gwella amrywiaeth cynefinoedd o fewn y sianeli presennol trwy gyflwyno &#8216;deunydd coediog mawr&#8217; neu drwy gael gwared ar ochrau glannau afon peirianneg galed o blaid gwrthgloddiau naturiol.<\/p>\n<p>Rydym hefyd wedi darparu sawl cilometr o ffensys i wahardd da byw ac atal potsio o\u2019r glannau, ynghyd a phlannu coed ar lan afonydd i\u2019w cadw\u2019n oer a hidlo d\u0175r ffo.<\/p>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=&#8221;1_2,1_2&#8243; _builder_version=&#8221;4.20.2&#8243; _module_preset=&#8221;default&#8221; width=&#8221;100%&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_column type=&#8221;1_2&#8243; _builder_version=&#8221;4.20.2&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_image src=&#8221;https:\/\/westwalesriverstrust.org\/wp-content\/uploads\/2023\/04\/River-restoration-2-scaled.jpg&#8221; title_text=&#8221;River restoration 2&#8243; _builder_version=&#8221;4.21.0&#8243; _module_preset=&#8221;default&#8221; animation_style=&#8221;fade&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][\/et_pb_image][\/et_pb_column][et_pb_column type=&#8221;1_2&#8243; _builder_version=&#8221;4.20.2&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_image src=&#8221;https:\/\/westwalesriverstrust.org\/wp-content\/uploads\/2023\/04\/River-restoration-1-scaled-e1687777819429.jpg&#8221; _builder_version=&#8221;4.21.0&#8243; _module_preset=&#8221;default&#8221; width=&#8221;98%&#8221; animation_style=&#8221;fade&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][\/et_pb_image][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=&#8221;4.20.2&#8243; _module_preset=&#8221;default&#8221; width=&#8221;100%&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.19.1&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_text _builder_version=&#8221;4.21.0&#8243; _module_preset=&#8221;default&#8221; animation_style=&#8221;fade&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221; sticky_enabled=&#8221;0&#8243;]<\/p>\n<h3><strong>Tynnu rhwystrau<\/strong><\/h3>\n<p>Mae rhwystrau mewn afonydd fel coredau yn cael nifer o effeithiau ar gynefin afonydd a bioamrywiaeth, gan gynnwys:<\/p>\n<ol>\n<li><strong>Darnio cynefinoedd<\/strong>: Mae rhannau o afonydd a oedd unwaith yn ddi-dor yn cael eu rhannu&#8217;n ddarnau ar wah\u00e2n, gan gyfyngu ar symudiadau organebau fel pysgod a&#8217;u gwahanu oddi wrth gynefinoedd\/adnoddau \/ cwblhau eu cylch bywyd a dianc rhag digwyddiadau llygredd.<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol start=\"2\">\n<li><strong>Diraddio cynefinoedd:<\/strong>i fyny&#8217;r afon o goredau, daw afonydd yn fwy tebyg i lynnoedd, gan foddi nodweddion naturiol fel crychdonnau ac achosi i gynefinoedd silio a meithrin pwysig i bysgod afon gael eu colli a lleihau&#8217;r cynnwys ocsigen.<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol start=\"3\">\n<li>Mae coredau&#8217;n atal <strong>trawsgludo gwaddod<\/strong>, gan leihau&#8217;r cyflenwad o raean i&#8217;r rhan i lawr yr afon, gan arwain at sianeli endoredig a llai o gynefinoedd silio a meithrin.<\/li>\n<\/ol>\n<p>Mae Ymddiriedolaeth Afonydd Gorllewin Cymru wedi mapio&#8217;r mwyafrif o\u2019r rhwystrau yn ein dalgylch ac wedi cael cryn lwyddiant wrth gael gwared ar, neu liniaru, llawer ohonynt er mwyn rhyddhau cannoedd o gilomedrau o afonydd i bysgod mudol, yn ogystal ac, yn bwysig iawn, i ail-naturioli llifoedd ac adfer cynefin. Fodd bynnag, mae cannoedd \u00a0o gilometrau eto o\u2019n blaen, felly dal ati sydd raid!<\/p>\n<p><em>Fideo &#8211; Cael gwared o gored Llan<\/em><\/p>\n<p><em>Gweler enghreifftiau pellach o\u2019n gwaith tynnu coredau a&#8217;n rampiau osgoi yma: <\/em><a href=\"https:\/\/westwalesriverstrust.org\/happy-world-fish-migration-day\/#:~:text=A%20joint%20project%20between%20Natural%20Resources%20Wales%20%28NRW%29,the%201800s%20to%20harness%20water%20power%20for%20milling.\">Diwrnod Mudo Pysgod y Byd Hapus! | Ymddiriedolaeth Afonydd Gorllewin Cymru<\/a><\/p>\n<p>[\/et_pb_text][et_pb_text _builder_version=&#8221;4.21.0&#8243; _module_preset=&#8221;default&#8221; animation_style=&#8221;fade&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;]<\/p>\n<h3><strong>Rhywogaethau Estron Goresgynnol<\/strong><\/h3>\n<p>Mae rhywogaethau estron goresgynnol yn anifeiliaid neu blanhigion nad ydynt wedi cytrefu&#8217;n naturiol ond sydd wedi&#8217;u cyflwyno (yn ddamweiniol neu&#8217;n fwriadol) gan bobl ac sydd bellach \u00e2&#8217;r gallu i beri bygythiad i&#8217;r amgylchedd, economi neu bobl. Ar hyn o bryd, mae dros 2000 o blanhigion anfrodorol wedi&#8217;u sefydlu yn y DU ond nid yw pob un o&#8217;r rhain yn ymledol. Mae tua 15% o&#8217;r planhigion hyn yn fygythiad i&#8217;n ffordd o fyw ac, ar \u00f4l sefydlu, mae eu difrod yn anwrthdroadwy, trwy ddifrod i seilwaith fel ffyrdd a thai, colli bioamrywiaeth trwy gystadlu \u00e2 rhywogaethau brodorol, a difrodi cynefinoedd afon. Mae rhywogaethau ymledol yng Ngorllewin Cymru yn cynnwys Jac y Neidiwr, pidyn y gog Americanaidd, canclwm Japan, efwr enfawr, a Cimwch yr afon.<\/p>\n<p>Mae Ymddiriedolaeth Afonydd Gorllewin Cymru yn gweithio i fapio a nodi cyfleoedd ariannu a phartneriaeth i ddileu a rheoli rhywogaethau estron goresgynnol (INNS) er mwyn hyrwyddo bioamrywiaeth, lleihau perygl llifogydd a diogelu ein hafonydd.<\/p>\n<p>[\/et_pb_text][et_pb_image src=&#8221;https:\/\/westwalesriverstrust.org\/wp-content\/uploads\/2023\/07\/WhatsApp-Image-2023-06-30-at-13.47.01.jpeg&#8221; title_text=&#8221;WhatsApp Image 2023-06-30 at 13.47.01&#8243; _builder_version=&#8221;4.21.0&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][\/et_pb_image][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Amcangyfrifir bod dros 90% o&#8217;n hafonydd yn y DU wedi cael eu haddasu gan bobl drwy arferion megis sythu, g\u00f4r-ehangu, carthu, draenio gorlifdiroedd ac ychwanegu rhwystrau mewn afonydd. Mae&#8217;r addasiadau [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":626,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","_price":"","_stock":"","_tribe_ticket_header":"","_tribe_default_ticket_provider":"","_tribe_ticket_capacity":"0","_ticket_start_date":"","_ticket_end_date":"","_tribe_ticket_show_description":"","_tribe_ticket_show_not_going":false,"_tribe_ticket_use_global_stock":"","_tribe_ticket_global_stock_level":"","_global_stock_mode":"","_global_stock_cap":"","_tribe_rsvp_for_event":"","_tribe_ticket_going_count":"","_tribe_ticket_not_going_count":"","_tribe_tickets_list":"[]","_tribe_ticket_has_attendee_info_fields":false,"footnotes":"","_tec_slr_enabled":"","_tec_slr_layout":""},"class_list":["post-664","page","type-page","status-publish","has-post-thumbnail","hentry"],"acf":[],"ticketed":false,"_links":{"self":[{"href":"https:\/\/westwalesriverstrust.org\/cy\/wp-json\/wp\/v2\/pages\/664","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/westwalesriverstrust.org\/cy\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/westwalesriverstrust.org\/cy\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/westwalesriverstrust.org\/cy\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/westwalesriverstrust.org\/cy\/wp-json\/wp\/v2\/comments?post=664"}],"version-history":[{"count":4,"href":"https:\/\/westwalesriverstrust.org\/cy\/wp-json\/wp\/v2\/pages\/664\/revisions"}],"predecessor-version":[{"id":757,"href":"https:\/\/westwalesriverstrust.org\/cy\/wp-json\/wp\/v2\/pages\/664\/revisions\/757"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/westwalesriverstrust.org\/cy\/wp-json\/wp\/v2\/media\/626"}],"wp:attachment":[{"href":"https:\/\/westwalesriverstrust.org\/cy\/wp-json\/wp\/v2\/media?parent=664"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}