Selection of the optimal type of fish pass using the Rembrandt method

Abstract

Aim of the study Aim of the paper was to use the Rembrandt multi-criteria decision support method to select the best type of fish pass for the analysed barrage, depending on the priorities adopted. Material and methods Hydraulic structures interrupt the continuity of morphological and biological watercourse, divide it into sections, which cannot be crossed by fish and other aquatic organisms. It is particularly disadvantageous, because motion up- and downstream is indispensable for them to live. For this reason fish passes are built on barrages to facilitate their migration. The article presents hydraulic calculations run for three types of fish passes. Also, a hierarchical tree was prepared in accordance with the Rembrandt method. This tree has been applied three times: for the owner’s preferences, for aquatic organisms, and without imposing a second level of calculation. Results and conclusions Results of calculations using Rembrandt’s multi-criteria decision support method indicated that according to the investor’s priorities the best fish pass was slot pass, for aquatic organisms - bypass channel, and calculations which assumed equal values for second level factors also point to slot pass.

Keywords

• fish pass
• barrage
• Rembrandt method