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Quantifying wave exposure daily and hourly on the intertidal rocky shore of central Chile

To quantify wave exposure on the rocky shore coast of central Chile, maximum water velocity recorders (dynamometers) of three different designs were placed in the intertidal zone and observed for a two week period during february 1995. Maximum velocity is considered as a gauge of exposure. The three devices examined here are both inexpensive and simple to build. Included among the designs was a recorder developed by us to allow velocity readings in the intertidal to be taken from afar. Thus exposure can be measured as the tide rises. A thorough description of each device is included. They recorded comparable quantified measures of wave exposure at sites subjectively designated as: sheltered, semi-exposed and exposed. The maximum water velocity recorded was 8.7 m s at the exposed site.