Abstract
The Balgzand area is situated in the tidal basin drained by the inlet Marsdiep in the western Dutch Wadden Sea. According to ZIMMERMAN (1976), a representative flushing time scale of the Wadden Sea as a whole is about 14 tidal periods (about 7 days). However, for the waters surrounding the Balgzand tidal flat, being situated more closely to the North Sea, a flushing time of about 5 tidal periods should be expected. Now, in turn, the water mass that can be properly called “Balgzand water” (in accordance with its tidal mean position) is flushed with water from the surrounding deeper tidal channels. In order to interpret various (bio) chemical processes in the Balgzand area the flushing time scale of the renewal of Balgzand water with water from the surrounding channels should be calculated and, if possibble, the mechanism of water exchange should be revealed. An extensive survey of the area, in coorperation with the “Studiedienst Hoorn of Rijkswaterstaat”, was carried out in May 1977. (DE BOER, 1978; MANUELS, 1978). As to the above-mentioned questions the survey revealed that:
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