WL heeft afgelopen jaren een groot aantal vispasage ontwerpen uitgevoerd, waaronder ook de aanpassing van de vispassage te Kerkhove (WL project 16_045). Na ingebruikname van de vispassage te Kerkhove werd in april 2021 een debietmeting uitgevoerd (WL project 21_041). Hiervan is een memo in opmaak. Uit deze metingen volgde dat er meer gegevens nodig zijn (bijv. gelijktijdig gemeten verval over afzonderlijke drempels en instroom) om debietcoefficienten voor breukstenen V-vormige overlaten te kunnen bepalen. Ook zijn stroomsnelheidsmetingen van belang om de passeerbaarheid te kunnen evalueren.
Door middel van dit project wenst WL in september/oktober 2022 een uitgebreide hydraulische validatie uit te voeren van de vispasage te Kerkhove. Concreet zullen bij 3 tot 5 maatgevende opwaartse waterpeilen de volgende metingen worden uitgevoerd:
- het verval over de bekkens en instroom (waterpeilen).
- het debiet door de vispassage.
- het stromingspatroon aan het oppervlak door middel van LSPIV.
- de op- en afwaarts en afwaartse peilen op de Bovenschelde.
(- puntsnelheidsmetingen.)
Het resultaat van deze metingen laat ons toe om meer inzicht op te bouwen over de werking van de vispassage en laat ons toe om het verloop van de debietcoefficient te bepalen voor breukstenen V-vormige overlaten. Dit is een meerwaarde voor zowel toekomstige ontwerpen als voor eventuele (kleine) optimalisatiemaatregelen in de vispassage te Kerkhove zelf.
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