Mae’n 06:30 ar fore braf yn Ynys y Barri, ac mae cannoedd o athletwyr yn paratoi i gymryd rhan mewn triathlon sbrint.
Ond eleni mae pethau ychydig yn wahanol, gyda rhai o’r cystadleuwyr yn cael eu tynnu i un ochr a theclynnau bach maint darn 50 ceiniog yn cael eu gosod ar gefn eu gwisgoedd nofio.
Dyma’r samplwyr newydd, sy’n cael eu defnyddio fel rhan o brosiect rhwng mudiadau chwaraeon fel Triathlon Cymru a Nofio Cymru, a phrifysgolion Bangor ac Imperial yn Llundain.
Fel arfer byddai trefnwyr y ras yn profi’r dŵr i weld a yw’n ddiogel i nofio ynddo, ond mae cyfyngiadau i’r math yma o samplu, gan ei fod yn cael ei gasglu mewn un neu ddau o fannau ychydig cyn y ras, ac felly nid yw’n rhoi darlun cwbl fanwl.
Mae’r samplwyr newydd yn dilyn union lwybr y nofwyr ar yr adeg maen nhw yn y dŵr, ac felly’n darparu data mwy cywir.
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