• Älvkarleby

Ansök senast: 2023-01-23

Design of sustainable spawning area for migrating fish, Thesis

Publicerad 2022-11-24

Om tjänsten

Power Climate Smarter living - that’s our purpose. We are looking for the brightest students to make this happen. Together you will contribute to a fossil free future. You will have a unique position to contribute to our purpose. All we ask from you is to use your Superpowers and share your energy to help us achieve our goal. 


About the thesis

Using your modelling skills, in this master’s thesis you will contribute to the work towards sustainable hydropower production. Sustainable hydropower includes a rich aquatic life where biodiversity plays a natural role in the operation of the powerplant and its dams.

To comply with the EU Water Frame Directive, which aims to achieve a “good” ecological status/potential of all rivers, the national ongoing hydropower relicensing process (NAP) in Sweden works towards mitigating the environmental impacts of hydropower production on the aquatic ecosystem.

Identifying potential restoration measures in terms of flow regulation and habitat availability will be important parts of the implementation of the directive.  

Commonly, habitat suitability is assessed by considering flow velocity and depth as well as bottom substrate. While the hydraulic parameters for habitat restoration are commonly calculated using 2D hydraulic models, ecological models are established to assess life-stage dependent habitat use by combining species-specific, hydraulic, and habitat knowledge. Parallel, potential habitat restoration measures should also evaluate hydro-morphological processes.

Bottom substrate is a key parameter when assessing potential spawning habitat. Understanding hydro-morphological processes can help identify spawning areas with a risk of scouring, deposition, and/or siltation.

Using 2D hydraulic modeling for sediment transport (preferably Hec-Ras), the task will be to assess areas that may be affected by sediment deposition under a range of flow scenarios. The student is expected to propose guidelines for the formation of sustainable, resilient spawning habitats. The student will play a vital role in improving river biodiversity and contribute to the mitigation of the environmental impact of hydropower plants as part of the NAP.

The assignment is suitable for one student.

Din bakgrund

We are looking for a student to join our journey towards a fossil free future. You are soon to be graduated from your academic studies. You also identify yourself with our principles: active, open, positive and safe.

  • The applicant has a background in environmental and/or hydraulic engineering (or similar), and should, preferably, have general knowledge about sediment transport, ecohydraulics, and hydraulic modeling (ideally Hec-Ras).
  • Scope 30hp
  • Required language skill is English but the thesis can be written in Swedish if preferred.

Mer information

  • Start of assignment: 2023-01-23 or by agreement
  • Location: Älvkarleby, but a hybrid solution can be discussed
  • Application – a combined document with your CV and cover letter, and grades are to be submitted in the application.
  • Deadline for application is 2022-12-11.
  • Contact person and supervisor at Vattenfall is: and


​​​​​​​Diversity & inclusion - in everything we do

At Vattenfall we build on the fact that diverse teams can outperform homogeneous teams. But we can only unleash and leverage the power of diversity, if we make everybody feel included. Read more about our important work on diversity & inclusion

Om oss

We have been electrifying industries, powering homes and transforming life through innovation and collaboration for more than 100 years. Empowered by our goal, we are determined to enable fossil free living within one generation. To succeed we, as one of Europe's leading energy companies, must be fossil-free ourselves.

But that’s not enough. That’s why we are looking beyond our own industry, to see where we can really make a difference.

Join us in our journey towards a fossil-free life within one generation.

Want to learn more about what we do? Visit

Since Vattenfall is a part of the Swedish critical infrastructure, many of our services are security classed. If this position is security classed the final candidates might be subjected to a security vetting process, according to the Swedish legislation.

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