Marine Spatial Planning (MSP) requires the analysis of the spatial distribution of marine uses and environmental conditions. Such analyzes can be carried out with GIS, but standard GIS programs do not feature a toolbox that combines the most needed functionalities for such analyses. The SPACEA toolbox presented here was created to bundle and adapt existing functionalities in one toolbox. SPACEA consists of several script tools that have been designed to be user-friendly and applicable to different analyzes for MSP. This includes the processing of different input layers with regard to marine uses and environmental conditions. The main functionalities of SPACEA are exemplified in a fictional case study in the Baltic Sea, where the tools are applied to find potentially suitable areas for mussel farming. The tools feature a user-friendly interface and more experienced users may also use the provided sample codes to run it from the python window or as a stand-alone script. As such, the tools can be applied by users with different levels of GIS knowledge and experience.
A new proposed framework to assess sustainability impacts of maritime spatial plans (MSP-SA) utilizes the ecosystem service (ES) concept to address the often-lacking social sustainability of the plans. This study departs from the MSP-SA framework and applies it to the (emerging) sea use of mussel farming. Informed by a literature review and two surveys, it is investigated whether the benefits and impacts of mussel farming can be related to underlying ES and relevant planning questions. The results show that most benefits and impacts of mussel farming can be connected to ES and reveal different user-environment-beneficiary interactions, ranging from conflicts to synergies. The marine planning framework is structured into different planning phases and it is shown that the ES concept can contribute to a normative vision, strategic objectives, and site-specific operational questions. Studying the different user-environment-beneficiary interactions can reveal who benefits and who loses from planning decisions. While the marine planning framework developed in this study is targeted at mussel farming, the approach can be adapted to other uses and planning areas and can contribute to social and equity aspects in MSP by considering the receivers of (dis)benefits.
There is growing evidence that the ecosystem service (ES) concept can provide valuable input to marine spatial planning (MSP), by highlighting which ecosystem goods and services can be produced from a planning area. ES link the underlying ecosystem processes and functions to the benefits humans can receive from ecosystems (the ecosystem cascade). In this study, we argue that the ecosystem cascade can be used to structure the stock-taking and future scenario analysis in MSP. However, indicators, which are needed for measuring ES, have often been applied in various ways to the different steps of the cascade. Here, we apply a consistent approach to sorting indicators into the cascade. The indicators are presented in an indicator pool that can be used to filter them based on the cascade steps, several quality criteria, and themes. The pool consists of 772 indicators, of which 735 were analyzed. In total, 252 analyzed indicators belong to the provisioning services, 314 indicators to the regulating services and 169 to the cultural services. The indicator pool offers a suitable starting point to select indicators for ES assessments within MSP. Using indicators at the different cascade steps allows the assessment of i) the ecosystem components generating the services and ii) the impacts on ES and their beneficiaries when changes occur in the provision of the services due to planning or management decisions.
This article discusses the role of private regulators within the international legal framework of Arctic shipping. The role of private actors has been acknowledged both in legal scholarship and policy papers; but it has not yet been placed in the centre of attention. This article does so by analysing the role of private actors under the Polar Code and three types of private regulation — guidelines of classification societies, requirements of insurance industry and private contracting. It concludes that private actors have an essential role both in developing and effectuation of public international law and thus in achieving sustainable Arctic shipping.
GreenHopper is the first Danish zero-emission ferry developed as a test platform for autonomous waterborne navigation technologies. The paper presents technology development within the innovation project ShippingLab Autonomy, which led to the commissioning of GreenHopper at Limfjorden (DK) in December 2022. The technology research resulted in a holistic system architecture for surface vessel autonomy, based on distribution of functionality and responsibility on software modules, similar to the structure observed in the International Maritime Organization (IMO) Seafarers Training Certification and Watch-keeping (STCW) regulatory framework. The paper shows how this approach results in an architecture that supports safe behaviours of individual modules and of autonomous navigation at a system level. The paper presents the individual modules, specific features and benefits. Elements of the regulatory framework are highlighted to poise technology approval by maritime authorities. The paper reflects on lessons learned, discusses continued technology validation in dedicated operational scenarios.
In the current transition of power industry from conventional sources to renewable energy sources, wind power generation is becoming one of the key sources of electrical energy. Although the development of wind power plants (WPPs) has made a significant contribution to addressing the demand for clean and cheap energy, the integration of large-scale WPPs introduces a series of technical challenges to power system operations. These challenges involved control, protection, and adherence to specified power quality standards. Particularly, power quality plays a vital role in utility systems and industries having direct technical and economic impact on both power consumers and suppliers. To tackle such issues, various grid codes have been initiated by regulation authorities. Moreover, different ancillary devices and control approaches have been adopted to comply with the established grid code. This article aims to review the state-of-the-art research and progress, while considering the main challenges related to dynamic performance and power quality enhancement of emerging grid-forming wind power plants. Various topologies of wind energy conversion systems (WECSs) are examined and compared, and their control strategies are investigated. A comprehensive review on power quality and dynamic response issues caused by large-scale wind power integration is presented. Moreover, the evolving grid code requirements for grid-connected WPPs in most leading countries including Denmark, U.K., Australia, Germany, and the USA are analyzed and compared. Furthermore, the improvement approaches proposed in the literature are investigated and classified on different basis and their pros and cons are discussed. A brief discussion on the solutions and future directions is presented. Finally, some conclusive considerations about the overall study are provided.
Decisions regarding investments in capacity expansion/renewal require taking into account both the operating fitness and the financial performance of the investment. While several operating requirements have been considered in the operations research literature, the corresponding financial aspects have not received as much attention. We introduce a model for the renewal of shipping capacity which maximizes the Average Internal Rate of Return (AIRR). Maximizing the AIRR sets stricter return requirements on money expenditures than classic profit maximization models and may describe more closely shipping investors׳ preferences. The resulting nonlinear model is linearized to ease computation. Based on data from a shipping company we compare a profit maximization model with an AIRR maximization model. Results show that while maximizing profits results in aggressive expansions of the fleet, maximizing the return provides more balanced renewal strategies which may be preferable to most shipping investors.
Highly accurate and precise heave decay tests on a sphere with a diameter of 300 mm were completed in a meticulously designed test setup in the wave basin in the Ocean and Coastal Engineering Laboratory at Aalborg University, Denmark. The tests were dedicated to providing a rigorous benchmark dataset for numerical model validation. The sphere was ballasted to half submergence, thereby floating with the waterline at the equator when at rest in calm water. Heave decay tests were conducted, in which the sphere was held stationary and dropped from three drop heights: a small drop height, which can be considered a linear case, a moderately nonlinear case, and a highly nonlinear case with a drop height from a position where the whole sphere was initially above the water. The precision of the heave decay time series was calculated from random and systematic standard uncertainties. At a 95% confidence level, uncertainties were found to be very low — on average only about 0.3% of the respective drop heights. Physical parameters of the test setup and associated uncertainties were quantified. A test case was formulated that closely represents the physical tests, enabling the reader to do his/her own numerical tests. The paper includes a comparison of the physical test results to the results from several independent numerical models based on linear potential flow, fully nonlinear potential flow, and the Reynolds-averaged Navier–Stokes (RANS) equations. A high correlation between physical and numerical test results is shown. The physical test results are very suitable for numerical model validation and are public as a benchmark dataset.
Entrepreneurship is often understood as an individualistic endeavour. This article investigates how cultural communities shape entrepreneurial activity through the process of envisioning competing imagined futures. By deploying a microhistorical approach, it explores a public debate about the transition from sail to steam in a late nineteenth-century Danish maritime community. In the debate, local actors evaluated and negotiated future entrepreneurial actions as embedded in existing norms, interpretations of the past, and socio-technical systems rather than independent, non-conformist ventures. The article demonstrates the potential role of community when we attempt to understand better how entrepreneurs construct and dispute over imagined futures.
Denne artikel beretter om CO2, NOx og PM2,5 emissioner fra skibe i Københavns Havn for perioden 2015-2019 beregnet i projektet ” ” Kortlægning af udviklingen i luftforurening fra krydstogsskibe og andre skibe i danske havne” udført af DCE - Nationalt Center for Miljø og Energi under Aarhus Universitet, for Miljø- og Fødevareministeriet (MFVM). De største kilder i havnen i alle år er krydstogtskibe, fulgt af tankskibes oliepumpning (losning af olieprodukter), passagerskibe, tankskibe, containerskibe og general cargo. Mindre bidrag beregnes for ro-ro cargo og slæbebåde samt uddybningsfartøjer, bulkskibe, forskningsskibe, offshorefartøjer og flydekraner. Pr. skibstype i 2019 beregnes følgende resultater for energiforbrug, CO2, NOx og PM2.5 (procentandele i parentes) for krydstogtskibe (56 %, 57 %, 50 %, 71 %), tankskibes oliepumpning (14 %, 13 %, 18 %, 8 %), passagerskibe (9 %, 9 %, 7 %, 9 %), tankskibe (6 %, 6 %, 8 %, 4 %), containerskibe (5 %, 5 %, 6 %, 3 %), general cargo (5 %, 5 %, 5 %, 2 %), slæbebåde (2 %, 2 %, 1 %, 1 %), ro-ro cargo (1 %, 1 %, 1 %, 0 %) og øvrige skibe (2 %, 2 %, 3 %, 1 %). Øvrige skibe omfatter uddybningsfartøjer, bulkskibe, forskningsskibe, offshorefartøjer og flydekraner.Udviklingen i CO2 emissionerne følger udviklingen i energiforbruget. De totale CO2 emissioner ændrer sig kun lidt i perioden fra 2015 til 2019, men varierer en del fra år til år for de forskellige skibstyper. Fra 2015 til 2019 stiger de samlede CO2 NOx og PM2.5 emissioner med hhv. 7 %, 5 % og 31 %. De totale emissionsstigninger skyldes især 24 % flere anløb med gradvist større krydstogtskibe i perioden, der i højere grad benytter tung olie og scrubberteknologi. Scrubberen, hvis funktion er at rense røggassen for svovl, er mindre effektiv til at begrænse udledningen af PM2.5. For krydstogtskibe beregnes CO2[NOx, PM2.5] e missionsstigninger på 34 %[26 %, 62 %]. For alle andre skibe og olie pumpning falder CO2[NOx, PM2.5] emissionerne med hhv. 13 %[8 %, 8 %]og 17 %[15 %, 16 %].