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1.
Navigational regime issues on the Soča river compared to the Douro river in Portugal: Challenges of tourism and environmental protection
Matevž Poklukar, 2025, master's thesis

Abstract: This thesis examines the economic, environmental and governance challenges of river tourism, focusing on the Soča river in Slovenia and the Douro river in Portugal. The study aims to analyse how sustainable tourism management strategies can be optimised to balance environmental conservation and economic benefits in river-based tourism. To achieve this, we employ a comparative case study approach, combining survey data from local stakeholders in the Soča Valley and extensive literature of tourism policies and environmental regulations. Findings reveal that the Douro river benefits from a structured governance model, effectively integrating tourism with conservation and agriculture. On the other hand, the Soča river faces fragmented policies, environmental degradation, and seasonal overcrowding, leading to economic volatility and stakeholder dissatisfaction. The study identifies key areas for policy improvement, including the introduction of a unified navigation authority, increased reinvestment in conservation, a tiered permit system differentiating between kayaking and rafting and infrastructure improvements. Additionally, case studies on the Zambezi river and Little Yampa Canyon demonstrate the benefits of controlled permit systems and reinvestment models. The research concludes that effective governance is crucial for achieving sustainable river tourism. By adopting structured management strategies, the Soča Valley could enhance economic resilience while mitigating environmental risks. The findings offer practical recommendations for tourism operators, local stakeholders and policymakers, providing a framework for balancing long-term sustainability with tourism growth.
Keywords: Sustainable tourism, river management, environmental conservation, economic impact, governance strategies
Published in DKUM: 27.06.2025; Views: 0; Downloads: 7
.pdf Full text (2,59 MB)

2.
Fuel conservation for launch vehicles: Falcon Heavy case study
Primož Jozič, Aleksander Zidanšek, Robert Repnik, 2020, original scientific article

Abstract: Space exploration has recently been growing at an increasing pace and has caused a significant burden to the environment, in particular, during the launch of rockets, when a large amount of fuel is burned and the exhaust gases are released in the air. For this case study, we selected the SpaceX Falcon Heavy reusable heavy-lift launch vehicle, which is one of the most promising rockets for the low-cost lifting of heavy payloads into orbit and beyond. We evaluated several strategies for optimisation of fuel consumption and for minimisation of environmental impact during launch through the atmosphere for the case of its first launch on February 6, 2018, when the rocket carried a red Tesla Roadster with a "Starman" in the direction toward Mars. In addition to the flight plan and Newtonian equations of motion, we have taken into account the thermodynamic properties of the rocket engines. Results are similar but slightly different if one minimises the total fuel consumption for the desired flight plan or if one minimises the environmental pollution during the initial stage of the launch through the atmosphere. The same methodology can be extended for launches in other directions including the Earth orbit and the Moon.
Keywords: fuel conservation, heavy-lift launch vehicles, environmental impact
Published in DKUM: 24.01.2025; Views: 0; Downloads: 9
.pdf Full text (1,61 MB)
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