engleski

Experimental investigation of flow field in a physical fishway model

This paper describes the detailed testing of the characteristic velocity fields on the physical model of pool-type and vertical slot fishway. For the physical model setup, a 18m long, 0.9m wide and 0.9m high hydraulic flume with rectangular cross-section was used. Each type of fishway was tested by a physical model in geometric scale 1:3 for the different gradient (12.5%, 10% and 7.5%), the pool length (45cm, 60cm and 90cm) and orifices or slots geometry. Raster of the measuring points is defined longitudinally, transversely and by the flow depth so that it includes all relevant positions that are of interest to estimate the hydraulic efficiency of the fishways. The results of experimental measurements were analysed by comparing the velocity field in pools for both types of fishways and all configurations within them. Flume experiments have shown that local variability of the flow field heavily influences the measurement quality and consequently the results.

pool-type fishway, vertical slot fishway, physical model, ADV, recirculation zone, slot zone

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