{"id":8968,"date":"2023-09-27T16:48:37","date_gmt":"2023-09-27T15:48:37","guid":{"rendered":"https:\/\/afonyddcymru.cambrianweb.dev\/afon-alun\/"},"modified":"2026-10-17T22:44:04","modified_gmt":"2026-10-17T21:44:04","slug":"afon-alun","status":"publish","type":"post","link":"https:\/\/afonyddcymru.cambrianweb.dev\/cy\/afon-alun\/","title":{"rendered":"Afon Alun"},"content":{"rendered":"

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Medi 2023<\/strong><\/p><\/div>\n\t\t\t<\/div>

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Yn tarddu ar Fryniau Clwyd, Afon Alun yw'r hiraf o lednentydd yr afon Ddyfrdwy. Mae ei henw Cymraeg \u00a0\u2018Alun\u2019, \u00a0yn golygu \"un crwydrol\".<\/p>\n

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O\u2019i tharddiad, mae\u2019r Alun yn llifo i\u2019r gogledd i ddechrau, trwy bentrefi Llandegla, Llanarmon-yn-I\u00e2l a Loggerheads (sydd ag enw unigryw), cyn troi i\u2019r dwyrain ac yna i\u2019r de-ddwyrain trwy\u2019r Wyddgrug, Bwcle, Llai, Gresffordd a\u2019r Orsedd. Gan aros o hyd ar ochr Gymreig y ffin, ar \u00f4l bron i ddeugain milltir mae\u2019r afon yn ymuno \u00e2\u2019r Dyfrdwy i\u2019r gogledd-ddwyrain o Wrecsam.<\/p>\n

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Mae gan yr Alun hanes diwydiannol cyfoethog. Mae dros 30 o felinau wedi gweithredu ar ei hyd ar wahanol adegau gyda \u00a0glo, plwm, tywod a graean hefyd wedi\u2019u cloddio, gan adael eu h\u00f4l ar y dalgylch.<\/p><\/div>\n\t\t\t<\/div>

\n\t\t\t\t\n\t\t\t\t\n\t\t\t\t\n\t\t\t\t\n\t\t\t\t\"\"<\/span>\n\t\t\t<\/div>
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Afon \u00e2 gorffennol diwydiannol\u2026.<\/p><\/div>\n\t\t\t<\/div>

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Rhwng pentrefi Loggerheads a Rhydymwyn (lle arhosodd y cyfansoddwr Almaenig Mendelssohn a chyfansoddi \u201cThe Rivulet\u201d ym 1829) mae'r afon yn llifo trwy Geunant Alun a darn o galchfaen carbonifferaidd, gan roi lefelau pH anarferol o uchel i'r d?r ar gyfer y rhan hon o Gymru. Mae \u201cllyncdyllau \u201d naturiol yn gyffredin yn y rhan hon o'r afon. Yn ystod cyfnodau o law isel, mae d?r yr Alun yn diflannu i'r tyllau hyn ac mae ogof\u00e2u'n ffurfio yn y calchfaen oddi tano, gan adael yr afon yn sych yn aml.<\/p>\n

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Mae gorffennol mwyngloddio'r afon wedi gwaethygu'r golled d?r, sydd wedi datgelu a chysylltu ceudodau yn y calchfaen. Gwnaed ymdrechion aflwyddiannus i selio\u2019r llyncdyllau er mwyn amddiffyn y mwyngloddiau rhag llifogydd, ond ddiwedd y 1800au, dechreuwyd adeiladu twnnel i ddraenio d?r tanddaearol. Hyd heddiw, mae Twnnel Milwr yn parhau i gymryd d?r Alun o gerllaw Loggerheads, gan ei wagio'n uniongyrchol i aber Afon Dyfrdwy ym Magillt 10 milltir i'r gogledd.<\/p><\/div>\n\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t\t\t\n\t\t\t\t\n\t\t\t\t\n\t\t\t\t\n\t\t\t<\/div>\n\t\t\t\t\n\t\t\t\t\n\t\t\t<\/div>

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\u201cLlyncdwll\u201d yng ngwely\u2019r Alun(llun: Howard Stevens).<\/p><\/div>\n\t\t\t<\/div>

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Taflen ffeithiau Afon Alun i\u2019w lawrlwytho.<\/p><\/div>\n\t\t\t<\/div>\n\t\t\t<\/div>

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Nid mater \u00f4l-ddiwydiannu yn unig yw sychu\u2019r rhan hon o\u2019r Alun, serch hynny. Yn \u00f4l ll\u00ean gwerin leol, pan gafodd cawr ei roi ar d\u00e2n gan Sant Cynhafal, neidiodd i\u2019r Alun i ddiffodd y fflamau, gan droi d?r yr afon yn st\u00eam ac nad oedd y llif ond yn cael ei adfer yn ysbeidiol ers hynny.<\/p>\n

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Mae\u2019r Alun wedi cael ei heffeithio gan lif uchel yn ogystal \u00e2 llif isel. Yn \u201cThe Alyn Anglers, A Century of Rossett and Gresford Flyfishers\u201d mae Paul Leng yn cyfeirio at welyau toreithiog ranunculus yr afon a gafodd eu dinistrio gan lifogydd difrifol yn gynnar yn y 2000au. Mae hefyd yn s\u00f4n am ymdrechion diflino'r clwb pysgota i ailsefydlu'r planhigyn pwysig, a oedd yn dechrau talu ar ei ganfed ar adeg ei ysgrifennu yn 2006. Yn anffodus, adroddwyd bod yr holl dwf newydd wedi'i fwyta gan gywion elyrch yn 2019.<\/p>\n

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Yn llyfr Pete Evans o 2017, \u201cResurrection River, a 4,000-year walk along the river Alun\u201d, mae\u2019r awdur yn s\u00f4n am ffynnon yn Llandegla, y pentref cyntaf y mae\u2019r Alun yn llifo drwyddo, a oedd yn \u00f4l pob s\u00f4n yn gwella epilepsi. Ar \u00f4l golchi yn ei d?r a thaflu pedair ceiniog i mewn, roedd angen i\u2019r dioddefwyr gerdded o amgylch y ffynnon dair gwaith ac yna o amgylch yr eglwys, gan ddal cyw i\u00e2r ac adrodd Gweddi\u2019r Arglwydd yr holl amser cyn treulio\u2019r nos o dan fwrdd y cymun gyda Beibl ar eu pen. Y bore wedyn roedd rhaid gadael y cyw i\u00e2r ar \u00f4l, ynghyd \u00e2 chwe cheiniog arall, ond dim ond pe bai\u2019r cyw i\u00e2r wedi marw yn ystod hyn i gyd y byddai iach\u00e2d yn digwydd. Yn \u00f4l pob tebyg, mae pinnau hir wedi\u2019u canfod yn y ffynnon, mae\u2019n debyg i helpu i sicrhau bod y broses hon yn cael ei chwblhau.<\/p><\/div>\n\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t\t\t\n\t\t\t\t\n\t\t\t\t\n\t\t\t\t\n\t\t\t<\/div>\n\t\t\t\t\n\t\t\t\t\n\t\t\t<\/div>

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Y dyddiau hyn, mae ansawdd d?r Alun yn amrywio, gyda\u2019r rhannau uchaf mewn \u201cstatws da\u201d ond yn gymedrol ymhellach i lawr yr afon. Mae ei ddwy brif lednant, y Terrig a\u2019r Cegidog, yn dda. Y prif bwysau ar ansawdd d?r yw llygredd gwasgaredig o ffermio llaeth a chig eidion, ynghyd ag elifion o weithfeydd trin carthion. Mae'r afon hefyd yn dioddef o erydiad glannau'r afon, addasu sianeli hanesyddol a gorlifdiroedd datgysylltiedig.<\/p>\n

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Mae cywiro'r problemau hyn ar gyfer Afon Alun wedi bod yn ffocws gwaith adfer gan Ymddiriedolaeth Dyfrdwy Cymru sydd wedi cwblhau 3.5 km o adfer cynefinoedd ers 2020 gyda 1.7km arall wedi'i gynllunio i'w gyflawni erbyn diwedd 2023. Maent hefyd wedi gweithio gyda 37 o ffermydd o fewn y dalgylch i leihau llygredd amaethyddol, gan fonitro wyth safle ar gyfer llygredd ffosffad a saith wedi'u monitro ar gyfer infertebratau ddwywaith y flwyddyn gan wyddonwyr dinasyddion er mwyn mesur effaith eu gwaith.<\/p><\/div>\n\t\t\t<\/div>

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Cyfeiriadau:<\/strong><\/p>\n

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\u201cResurrection River, a 4,000-year walk along the river Alun.<\/em>\u201c\u009d Pete Evans, 2017.
\u201cThe River Alyn, A Brief Review of Past Present and Future.<\/em>\u201c\u009d Howard Stevens, President Rossett & Gresford Flyfishers, 2019.
\u201cThe Alyn Anglers, A Century of Rossett and Gresford Flyfishers<\/em>\u201c\u009d Paul Leng 2006.<\/p>\n

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Diolch hefyd i Mark Pierce<\/strong>, ymddiriedolwr Ymddiriedolaeth Dyfrdwy Cymru<\/strong> ac aelod o bwyllgor Pysgotwyr Plu Rossett a Gresford<\/strong> am gymorth gyda gwybodaeth a lluniau.<\/p><\/div>\n\t\t\t<\/div>

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Postio:<\/p><\/div>\n\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t\t\t\n\t\t\t\t\n\t\t\t\t\n\t\t\t\t\n\t\t\t<\/div>\n\t\t\t\t\n\t\t\t\t\n\t\t\t<\/div><\/p>\n","protected":false},"excerpt":{"rendered":"

Yn tarddu ar Fryniau Clwyd, Afon Alun yw’r hiraf o lednentydd yr afon Ddyfrdwy. Mae ei henw Cymraeg \u2018Alun\u2019, yn golygu “un crwydrol”.<\/p>\n","protected":false},"author":3,"featured_media":8370,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[58],"tags":[],"class_list":["post-8968","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-afon-y-mis"],"yoast_head":"\nAfon Alun - Afonydd Cymru<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/afonyddcymru.cambrianweb.dev\/alyn\/\" \/>\n<meta property=\"og:locale\" content=\"cy_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Afon Alun - Afonydd Cymru\" \/>\n<meta property=\"og:description\" content=\"Yn tarddu ar Fryniau Clwyd, Afon Alun yw'r hiraf o lednentydd yr afon Ddyfrdwy. 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