NHK weather report just said that the coast line, north and south of the damaged Fukushima Daiichi nuclear power plant, will experience high tides. A high tide advisory in effect.
The double whammy is that the land has sunk due to the 9.0 quake, and there is now huge amounts of cesium-137 in the water.
That means when the high tides hit, they’ll go further inland, and take cesium-137 inland as well. The land, along the coast, is already getting hit with airborne radiation, now it’ll be flooded with radioactive water.