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DHI study reveals how automated calibration enhances reliability of water modelling

Recent research demonstrates how automated calibration techniques are advancing hydrodynamic modelling, delivering faster, more reliable results to support informed decision-making in water management.
 
Hydrodynamic models are essential tools for simulating how water moves through environments such as rivers, estuaries and coastal areas. They are critical for decision-making in areas including flood protection, navigation, coastal development and environmental conservation. However, building reliable models requires inputting a wide range of parameters — many of which are difficult, costly or even impossible to measure directly across time and space.
‘Parameters like bed roughness or turbulence coefficients can vary greatly across landscapes and water bodies’, explains Clemens Cremer, DHI’s GenAI Lead and Expert in Data &amp; Modelling. ‘It is not feasible, be it economically or for technical reasons, to measure all of them, their spatial resolution or temporal variability. Calibration allows us to fine-tune the models by adjusting these parameters in a physically reasonable range until the outputs align with observed data, such as water levels or flow speeds.’
The limits of manual calibrationTraditionally, this calibration has relied on manual trial-and-error by experienced modellers. While effective, it is time-consuming, can be subjective and increasingly impractical as models become more complex. For example, calibrating a model with 11 different roughness zones, as in DHI’s Elbe River case study, means tracking thousands of possible parameter combinations and their interactions.
This is where automatic model calibration is making a breakthrough.
DHI’s study shows that automated calibration techniques can systematically explore vast combinations of parameters, identifying the optimal settings to produce accurate, consistent model predictions. These methods can shift the focus of the modeller from tedious assessment of model results and adjustment of parameters for each model-run to more thorough thought about right metrics (what defines a ‘good’ model for a specific purpose) prior to starting the calibration. As an added benefit, autocalibration might obtain solutions human experts might miss — especially in high-dimensional parameter spaces.
Efficiency, flexibility and smarter insightsClemens adds, ‘The benefits of automated calibration extend beyond just efficiency. Automated calibration can work with diverse data sources, from traditional water level gauges to satellite measurements, making it possible to create accurate models even in regions with limited in-situ monitoring infrastructure. 
‘They can also determine parameter sensitivity and provide insights into tradeoffs when multiple objectives (e.g. optimising for error in space or in time) are pursued. This makes it easier to align model outputs with client goals and regulatory standards. That’s a game changer for decision-makers in water environments.’
 
Join the conversation at IAHR 2025Clemens Cremer will be presenting his research at the IAHR World Congress 2025, where DHI's representatives will be available to share insights, discuss ongoing projects and highlight recent technological developments. Find us at the Singapore EXPO, Hall 2A, Booth C4.
 
Follow DHI’s LinkedIn page for updates and coverage from the event.

DHI at IAHR 2025: Advancing research, development and innovation for a sustainable water future

From 23 to 27 June 2025, DHI will join global experts, researchers and practitioners at the 41st IAHR World Congress in Singapore. Organised by the International Association for Hydro-Environment Engineering and Research, this year’s congress will explore the theme ‘Innovative water engineering for sustainable development’.
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The event will focus on the evolving challenges at the intersection of water resources management and climate change adaptation, including the links between water, energy, food security and nature. As a gold sponsor, DHI will contribute to the discussions through a series of presentations, sessions and high-level panels that reflect the company’s focus on making an impact – by bringing research, development, innovation and technology together to address real-world water and environmental challenges.
Key contributions at IAHRDHI’s contributions at IAHR 2025 will highlight the role of applied research and digital tools in helping cities and industries adapt to climate impacts, protect ecosystems and improve water management practices. Representatives from DHI will present in both technical and strategic forums, contributing perspectives on digital innovation, stakeholder engagement and integrated modelling approaches.
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Presentations include:

Comparing optimisation methodologies for calibration of 2D/3D hydrodynamic models | Speaker: Clemens Cremer, Expert, Data &amp; Modelling and GenAI Lead, Software Products
A flexible subgrid method for fast flood simulations using shallow water equations with enhanced bathymetry resolution | Speaker: Max Bitsch, Ph.D. Student, Software Products
Integrated air and water phase modelling of hydrogen sulphide transport in sewer systems | Speaker: Line Karin Mortensen, Scientific Software Developer, Software Products
Robust sensor data validation with deep learning: performance analysis with synthetic anomalies | Speaker: Rocco Palmitessa, Senior Data &amp; Modelling Engineer, Software Products
Local stakeholder engagement in sustainable management of marine habitats using satellite technology – an example from Malaysia | Speaker: Malinda Auluck, Senior Environmental Consultant, Marine &amp; Coastal
Informing adaptive development in sensitive coastal habitats using environmental data and hydrodynamic modelling | Speaker: Thue Geil, Portfolio Lead, Marine &amp; Coastal
Modelling of sediment clump in open water sediment disposal | Speaker: Jenn Wei Er, Head of Projects, Marine &amp; Coastal&nbsp;

In addition, DHI will contribute to a report on the digital transformation of the water sector and present its findings during a special session at IAHR.&nbsp;Stefan Szylkarski, Executive Vice President for Water in Cities at DHI, will also participate in a high-level panel discussion on flood-resilient cities.
Stefan Szylkarski states:&nbsp;‘DHI focuses on bridging the gap between research into practical solutions that deliver real-world impact. Our work spans sustainable water management, ecosystem protection and climate adaptation, with an emphasis on applying scientific insights where they make the most difference. Flood-resilient cities are one key example, where we integrate modelling, data and technology to help urban areas mitigate and adapt to extreme weather events. IAHR 2025 provides a valuable opportunity to share our approach and exchange knowledge with others addressing similar challenges.’
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Join the conversation at IAHR 2025DHI will be present at Singapore EXPO, Hall 2A, Booth C4 throughout the congress, where representatives will be available to share insights, discuss ongoing projects and highlight recent technological developments. Follow DHI’s LinkedIn page for updates and coverage from the event.

The agreement between DHI and ISA was formalised at the UN Ocean Conference 2025 by DHI’s CEO, Mette Vestergaard, and ISA’s Secretary-General, Leticia Carvalho.

The International Seabed Authority (ISA) and DHI have entered a partnership to jointly promote evidence-based decision-making, regional environmental planning and monitoring and capacity development in support of the protection of the marine environment.&nbsp;
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The International Seabed Authority (ISA) and DHI are pleased to announce the signing of a Letter of Cooperation (LoC) to enhance scientific cooperation and environmental management. The agreement was signed at the 2025 United Nations Ocean Conference held in Nice, France, by Leticia Carvalho, Secretary-General of the ISA, and Mette Vestergaard, Chief Executive Officer of DHI.
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The LoC formalises a strategic partnership that will support the ISA’s mandate under the United Nations Convention on the Law of the Sea to ensure the sustainable and responsible management of mineral resources beyond national jurisdiction. Through this collaboration, ISA and DHI will jointly promote evidence-based decision-making, regional environmental planning and monitoring and capacity development in support of the protection of the marine environment.
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Mette Vestergaard stated, ‘The international seabed area is of vital importance to us all. With this partnership agreement, we are one step further in ensuring that decisions about the seabed are guided by science and based on knowledge about the impact on the environment.’
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Leticia Carvalho welcomed the collaboration, saying, ‘The ISA is constantly seeking to expand both national and international knowledge of the deep sea, our common heritage, through sound data and to expand capacities for both regional environmental planning and global ocean management. Our collaboration with DHI is an important step in these efforts.’
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Under the terms of the LoC, DHI will support the analysis of deep-sea environmental data collected by the ISA over the past three decades. The collaboration will include advisory services and training programmes designed to strengthen the technical and scientific capacity of the ISA’s Member States, particularly developing countries, and to advance regional environmental planning initiatives in the international seabed area.
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Danish ocean expertise in global collaborationDenmark has long been recognised for its leadership in marine research, environmental technology and sustainable water management. As an acknowledged Research and Technology Organisation (RTO), DHI combines advanced modelling, scientific tools and field expertise to transform research into practical solutions, from laboratory to the open ocean.
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The ISA and DHI have already worked together on capacity building, the development of threshold values and regional environmental planning. This new agreement builds on that foundation and creates new opportunities to support ISA’s work in ensuring environmental stewardship and the equitable use of deep-sea resources.
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Shared vision for the ocean’s futureThe ISA was established by the United Nations Convention on the Law of the Sea and is mandated to regulate deep-seabed mineral activities beyond national jurisdiction – an area that covers more than fifty per cent of the Earth’s surface. Its dual responsibility is to ensure that the resources of the deep seabed benefit all of humanity, while protecting the marine environment for future generations.
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The partnership between ISA and DHI reinforces their shared commitment to informed, transparent and responsible ocean governance, grounded in the best available science.

Safeguarding Brunei’s marine environment: DHI co-hosts key workshop on sustainable coastal development

As Brunei Darussalam continues to develop its coastal areas, protecting marine environments remains a national priority. In line with Brunei Vision 2035 and the nation’s Environmental Protection and Management Act, DHI Brunei co-organised a one-day workshop on Sustainable Environmental Planning for Coastal and Marine Development with the Department of Environment, Parks and Recreation (JASTRe).
The workshop brought together around 60 participants from government agencies and the private sector, fostering cross-sector collaboration. It provided valuable insights into best practices, current challenges and innovative strategies for managing Brunei’s marine resources sustainably.
Guest of honour Haji Shaharuddin Khairul bin Haji Anuar, deputy permanent secretary (Infrastructure, Housing and Professional) at Brunei’s Ministry of Development, highlighted the nation’s growing focus on environmental protection. He stressed the need for sustainable planning to safeguard Brunei’s marine resources for future generations, aligning with national goals and addressing global environmental challenges.
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DHI’s expertise at the forefront of coastal planningDHI experts led several key sessions, drawing on their extensive experience from both regional and international coastal and marine projects:
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Liaw Lin Ji, Head of Environmental Solutions for DHI Brunei and Malaysia, delivered the keynote address. She emphasised the role of science-based planning in building climate resilience and achieving Brunei Vision 2035, as well as United Nations Sustainable Development Goals (SDGs), particularly SDG 11, 13 and 14.&nbsp;
Jack Lee Vun Zac, DHI Malaysia country manager and coastal engineer, presented on sustainable shoreline management and coastal morphology in development planning
Dr. Claus Pedersen, regional technical director, spoke on dredging practices and the use of numerical tools to assess impacts at river mouths and along shorelines
Dr. Robert Scott Nichols, senior environmental consultant, shared strategies for responsible marine aquaculture, including monitoring systems that support water quality and regulatory compliance

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Collaborating for resilient coastal developmentThe workshop served as a crucial platform for collaboration among developers, regulators and environmental professionals. Discussions focused on shoreline protection, dredging activities and marine aquaculture – key areas essential to Brunei’s coastal resilience and environmental sustainability.
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‘Brunei’s coastal areas are under increasing pressure from development and climate change’, says Liaw Lin Ji. ‘Addressing these challenges requires integrated, science-based planning to ensure long-term resilience and sustainability.'
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DHI remains committed to supporting Brunei with expert-driven, data-based solutions for sustainable marine and coastal development.

DHI releases MIKE 2025 Update 1 with new features for water modelling

DHI has released MIKE 2025 Update 1, the latest version of its MIKE Powered by DHI software suite for water modelling. This update delivers new features and enhancements across key products, aimed at supporting engineers and water professionals in their work. This update is available at no additional cost for clients with an active Service Maintenance Agreement (SMA) or subscription.
 
What's new in MIKE 2025 Update 1

MIKE+ introduces an updated discharge calculation tool that streamlines the estimation of flows through sections from 1D and 2D results directly within MIKE+. Rivers and Collection System models have a new workflow to associate simulations with various rainfall events, saving time and increasing flexibility. Additionally, a new Water Hammer engine brings faster simulations, Linux support and check valve modelling. 
FEFLOW 10 empowers users to present models with enhanced online 3D terrain visualisation including a new Online Maps toolbar that provides full control over visualisation settings and map types, and introduces new features to search for locations, coordinates and more. Additionally, a new ‘Create surface from Supermesh elements’ tool enables the generation of 3D surfaces from point data—no external geological software needed. Plus, the fully integrated smh3d format supports all legacy 3D functions and offers improved mesh repair capabilities to better handle complex geological intersections.
WEST now comes with a built-in compiler and full 64-bit support, boosting compilation and simulation speed. The full transition to the Modelica language brings greater flexibility for advanced modelling. In addition, automatic mass flow tracking makes it easier to calculate and verify component mass balances across the plant, while improved tools for micropollutant and N₂O modelling enhance support for plant upgrades and optimisation. Lastly, the WEST interface is now also available in French.
MIKE WaterNet Advisor now includes a step-by-step user guide that streamlines onboarding and aligns with digital twin workflows. Smart features like disk space alerts, improved contact time calculations and model-based valve support in shutdown planning make it easier to maintain water quality and network performance.
MIKE OPERATIONS features a new MIKE Modelling Workbench that provides a unified environment to prepare, process and visualise data from folders, GIS or the cloud. MIKE SHE users can now build real-time forecasting tools in just hours, thanks to enhanced input raster processing, adaptors and hotstart support. Updated time series tools streamline data import and model setup, while improved Python integration allows users to leverage their favourite libraries.

Availability and more information
MIKE 2025 Update 1 is now available for download, with key features outlined in the release highlights.
 
DHI will also be hosting a series of webinars offering in-depth insight into the new features:  

12 June - What’s new in MIKE+ and MIKE WaterNet Advisor
12 June - What’s new in FEFLOW
17 June - What’s new in WEST

For assistance or to reactivate an expired SMA, clients are encouraged to contact their local DHI office. 
 

DHI launches advanced Navigation Simulation Centre in Singapore for maritime risk assessment

DHI announces a major leap forward in maritime simulation with the integration of FORCE Technology Singapore’s advanced assets into its Navigation Simulation Centre. This upgrade allows users to experience the future of maritime risk assessment by transforming traditional 2D views into a fully immersive 3D experience — putting them right on the virtual bridge to navigate real-time, lifelike marine environments with unmatched realism.
Modelling marine and coastal environments worldwideStrategically located in Singapore, DHI’s Navigation Simulation Centre is ideally positioned to support the region’s expanding port and maritime infrastructure. Its advanced capabilities, however, extend well beyond the region, enabling support for clients and projects on a global scale.
Through seamless integration with DHI’s MIKE Powered by DHI software, the Centre can simulate marine and coastal environments anywhere in the world, incorporating site-specific wave, current and wind conditions. This global adaptability allows DHI to effectively support port authorities, marine engineers, shipping companies and regulatory agencies in both proactive planning and real-time maritime risk assessment.
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Mamta Jain, DHI’s Vice President for Marine &amp; Coast Asia, highlights the launch of DHI’s Navigation Simulation Centre as a transformative step forward — expanding our ability to deliver integrated, high-value maritime consultancy services worldwide.
‘This Centre is a strategic expansion of our capabilities, combining cutting-edge simulation technology with deep industry expertise. It allows us to provide precise risk assessments for ports, offshore wind farms and oil &amp; gas projects, while also enhancing pilot and tug master training, emergency response planning, cruise navigation and incident reconstruction,' says Mamta.
By strengthening operational resilience and skills development, DHI is empowering clients — including port authorities, energy developers, regulators and insurers — to navigate today’s complex maritime environment with confidence and safety.&nbsp;
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DHI’s Senior Marine Scientist, Theophilus Teo, emphasises the Centre’s unique value in transforming risk management through immersive simulation:
‘The Navigation Simulation Centre provides an unparalleled, real-time insight into navigational challenges, enabling stakeholders to anticipate and mitigate risks in highly dynamic marine environments. This proactive approach not only enhances operational safety but also supports strategic decision-making to optimise efficiency and resilience.’
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The Navigation Centre allows you to:&nbsp;

Validate port layouts and waterway designsManoeuvre simulated ships through new environments to determine their viability and assess risk.&nbsp;
Investigate limiting operating conditionsTest the safety of operational limits by iterating through different combinations of environment, port and ship resources and emergency scenarios.
Optimise multi-vessel operating proceduresRun coupled simulations involving multiple ships and tugs, supported by experienced tug masters, to refine manoeuvring strategies and reduce operational bottlenecks.
Make evidence-based decisions with expert supportLeverage the expertise of master mariners, pilots and simulation engineers to interpret simulation results, refine designs or procedures, and conduct training.
Access accurate and validated ship behaviour modelsUse a comprehensive database of tested ship models and the DEN-Mark1 hydrodynamic model to ensure simulation realism.
Seamless coupling with MIKE suiteSimulate ship behaviour in realistic 2D and 3D environments driven by currents and waves built with MIKE.

In addition, the Centre supports pilot training in realistic scenarios, helping crews build familiarity with new ports, vessels or conditions using full-mission simulators that accurately replicate ship behaviour under a range of environmental effects.
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The launch of the Navigation Simulation Centre marks a step forward in how complex marine operations and navigational risks are assessed. As global maritime activity increases and port environments grow more complex, such simulation technologies are becoming an essential tool for improving planning, safety and operational efficiency across the industry.
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Look out for updates on DHI's LinkedIn page.

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