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Bank Structuring in Urban Environments through Micro Groins

Andreas Müller – Hector Fellow Franz Nestmann

Instream River Training ist eine Form des Flussbaus, bei der die Strömung durch die Induzierung einer oder mehrerer Sekundärströmungen so modifiziert wird, dass Ufer- und Sohlerosion verhindert werden. Die hierbei verwendeten Lenkbuhnen bieten Uferschutz, Kosteneinsparungen und ökologische Vorteile gegenüber klassischem Längsverbau. In diesem Promotionsprojekt wird die entstehende Gewässerstrukturierung untersucht, um die Eignung von Lenkbuhnen als Maßnahme zur gezielten Schaffung abwechslungsreicher Lebensräume in urbanen Fließgewässern nachzuweisen.

The European Water Framework Directive requires that all waterbodies achieve a good ecological status until 2027. In urban environments the restricted spatial conditions and different interests cause problems in river restoration. The present highly regulated rivers only offer uniform and monotonous habitats for fauna and flora. In contrast to that, natural watercourses are characterized by flow diversity and thus a large variety of hydraulic depths and river widths.

Instream River Training is a method of river engineering, in which the current is seen as the cause for bank erosion and bed erosion. Consequently, it is modified by inducing secondary flow. In order to achieve this, micro groins (submerged vanes) are installed in the river bed.

In this PhD project, the changes of the bed structures are to be examined by laboratory experiments and field observations in order to quantify the suitability of micro groins as a mean to create diversely structured habitats in urban environments. The fluid mechanic principles will be developed in cooperation with a project in Vietnam funded by the Federal Ministry of Education and Research.

The aim of this PhD project is to give specific recommendations concerning the design of micro groins and their measurements in order to maximize the ecological benefits of this construction method. The appropriate bank protection and economical criteria will be considered as well. The project is supervised by Hector Fellow Franz Nestmann.

 

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