ich it came. Since grains are redeposit as the water retreats, the grains are actually deposited further down the beach or down long shore current. The net overall movement of sand is down current. The sediment that has moved down shore is replaced by sediment from further up shore, as long as sediment is available there. If the waves hit the beach from the south, the net movement of sand will be to the north as we saw last week at the Loyola beach. Net beach sediment movement can change back and forth with shifts in wave direction. In spite of this, along any particular shoreline one direction for incoming waves usually dominates resulting in a preferential net movement of sediment. Sand and water work together consistently on the shore. Many years of this procedure of waves movement will result in one side with more sand than the other. The side with less sand, in conclusion, will be replaced with sand poured in by humans. ...
