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Initial standard-profile with measuring tape

by Matthias Schaber last modified Jul 01, 2008 11:25

On the 15th June 2008 we conducted a standard-profile dive for TaMOs using a measuring tape for the first time. This method is a very exact one and facilitates later analyses of the records. Nevertheless, this method is incompatible with the features of a "normal" dive. The measuring tape is fixed on the shoreline and then uncoiled completely.

Initial standard-profile with measuring tape

The TaMOs team is always interested in practical tests of different survey techniques. Here we referred to the swedish phytobenthos-monitoring. Two 50m measuring tapes were obained quickly and anchoring the tape on the beach also proved to be no problem. Instantly people promenading on the beach were attracted and asked what we were doing. The introduction to TaMOs had to be a short one as intense sunlight and the complete scubadiving gear are not necessarily compatible.

We got into the water and slowly uncoiled the measuring tapes straightly. After the second tape had been unrolled, we beared the direction and descended.

This method has some clear advantages for a profile-dive, but also some essential disadvantages (listed below).

Tha TaMOs team tested the feasibility of this method for the monitoring. Two 50m tapes had been used allowing a transect of 100m length from the shoreline in Strande to ca. 30m from the mole.

Right now, we consider providing interested scubadivers with the measuring equipment and thus record so called "standard-profiles" for each diving site. If you have questions or opinions on that method don´t hesitate to contact us.

 

 Advantages and disadvantages of recording observations using a measuring tape:

Advantages Disadvantages
  • Keeping the right direction/bearing is easy, as it is only necessary to follow the tape on the seafloor. This enhances full attention for everything that can be seen.
  • The order of records refers exactely to the order of species etc. observed.
  • All records are very exact, easily comprehensible and good to correlate with the dive-profile from a scubadiving computer.
 
  • The course of the profile-dive is directed from sea to land - there is no space for alternatives.
  • The scaling of centimeters on the tape could in a rush of scientific eagerness lead to a too detailed record of everything (e.g. "12.345m")
  • The ability to measure distances highly detailed sometimes leads to complete oblivion of everything left or right from the transect. (So there is a complete record of algae available after the dive but not a single fish has been observed...)
 
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