Question: what is the difference between diurnal semidiurnal and mixed tidal patterns?
Answer: In general, most areas have two high tides and two low tides each day. When the two highs and the two lows are about the same height, the pattern is called a semi-daily or semidiurnal tide. If the high and low tides differ in height, the pattern is called a mixed semidiurnal tide. ... This is called a diurnal tide.