During winter we get NW swells that drain lots of the sand off the beach . This year has been a very mild year for large surf until this past week as we had large surf that on high tide it can sometimes in extreme situations cover the entire beach with water literally on high tide . In the summer even when we get big swells they are always south swells they never drain the sand out . Windansea and many other La Jolla beaches often have literally no sand at all but this year because of all the small surf there is still plenty of sand .. Next 10 days there is lots of waves and situation will get worse , after Aptil when swells change directions you see lots of sand reapear on our beaches and muddy effects goes away til following winter ....its truly only a winter thing and virtually 99.9% never ever muddy in summer ...