One dAy i wrote her nAme upon the strAnd, but cAme the wAves and wAshed it awAy: agAin I wrote it with a second hAnd, but cAme the tide, and mAde my pAins his prEy.
This sound reinforces the emotions that the poet wants to put into his sonnet. The "a"-sound creates associations with hope, with faith. It gives the sonnet notes of positive.
Analyzing Shakespeare's sonnet the sound that appears most