For 25 years, MIKE Powered by DHI’s software products have been used in water environments all over the world. Thousands of professionals choose MIKE software to solve tough and complex challenges in areas such as oceans and coastlines, rivers and reservoirs, ecology, groundwater, water distribution, wastewater and many more.
Our data management, decision support and operational forecasting software suite traverses all our areas of applications, complementing existing MIKE technologies in the work we do for you.
MIKE Powered by DHI is a range of software products that enable you to accurately analyse, model and simulate any type of challenge in water environments.
Whether you need access for a single user, small businesses, large corporations or universities, we have the pricing option that fits your budget and modelling needs.
We offer Subscription Packages which provide the freedom to enjoy multiple applications with greatly enhanced scalability, Perpetual Licenses if you prefer to build your own software portfolio, Academic Licenses for academic staff and students, as well as access through Azure Marketplace (bring your own license) and MIKE Software as a Service (no separate license necessary). With a wide variety of user access options available, there is sure to be one that is right for your projects.
News & Resources
Get the latest insights into the water industry
See what we’re up to, explore the blog, browse our case stories, download an eBook, listen to a podcast and discover our training courses.
Designing twin training walls for the dynamic Opotiki Harbour Entrance
Opotiki is a township with a strong vision of increasing the social and economic well-being of its community. Researched initiatives have shown that Opotiki is perfectly positioned for a large-scale aquaculture venture—a success that can only be brought alive through a transformation of the harbour entrance. Once a well-used trading route, local authorities are looking to make the harbour easier to navigate by constructing two parallel river training walls at the entrance. We provided design expertise and also assessed many significant factors which could impact the components of the ambitious project.
A dynamic coastal environmentThe coastal township of Opotiki sits on New Zealand’s eastern coast, in the North Island’s Bay of Plenty. Prior to the mid 1960’s, the Opotiki harbour entrance had a long history of use by coastal shipping vessels which visited the township primarily as a trading port. Since then, the ability to navigate through the entrance has been adversely affected as waves routinely transporting sediments into the entrance formed an unreliable and often unsafe passage between the river and the sea. The confluence of the Waioeka and Otara rivers, approximately 1.5 kilometres above the harbour entrance, adds further complexity to the dynamic nature of the unique coastal environment.
The most serious incident to date was when the entrance was closed for 64 days in 2007. Regular users of the route found it challenging and dangerous to navigate the passage five days out of 30 in a month on average. The Opotiki District Council (ODC) rallied central and local government, iwi and community groups, and commissioned a series of investigations to improve access to the harbour. We were engaged to find a solution by providing a conceptual design for the river training works while assessing environmental impacts at the same time. After considering many alternatives, our findings concluded that twin training walls at the entrance would provide the most appropriate stabilisation. One of the most important elements involved determining whether the large scale infrastructure project would adversely affect flood levels on the township.
Understanding the options and the impactsDifferent training wall configurations were assessed for a range of river flows and coastal conditions. We studied many aspects of the walls, including their ability to maintain anavigable entrance, the expected navigation conditions and possible scour in their vicinity. We also assessed the impacts on salinity within the harbour, sedimentation elements, and backwater effects. On mitigating flood impacts, our experts recommended a confluence realignment as a feasible solution.
Our solution was to construct two short straight breakwater training walls with a new entrance to the east of the existing one. The walls, approximately 500 metres long and 120metres apart, will also have scour protection elements included, without which the walls could be undermined during a large flood when deep scour may occur in between. Theconstruction costs were calculated and outlined in the project report which we presented to ODC in 2007.
Large scale infrastructure projectWe needed to ensure long term viability in order to continually support Opotiki’s aquaculture vision. To undertake such a large-scale project, there were critical elements to consider. Risk factors, flooding impacts and design issues were considerable challenges for our experts.
Ensuring the safe navigation of the harbour entrance while avoiding upstream flooding was principal within the project, as was understanding the many various coastal morphological impacts at play.
With the application of one-dimensional (1D) and twodimensional (2D) models utilising MIKE 21 HD, MIKE 21 SW, LITPACK, MIKE 21 ST and MIKE 3, our team successfully developed a robust solution for ODC.
From our modelling, we established that a re-engineered harbour entrance could alleviate the vessel access issues, allowing for more stable and improved entrance conditions. Although long term morphological impacts for flooding mitigation required further investigation, a realignment channel would somewhat reduce flooding impacts. The project, when undertaken, will greatly open up opportunities for the coastal settlement of Opotiki, creating potential aquaculture ventures and raising the wellbeing of the local community on manylevels.
Opotiki District Council (ODC)
MIKE 21 Hydrodynamics (HD)MIKE 21 Spectral Waves (SW)LITPACKMIKE 21 Sand Transport (ST)MIKE 3
Do you have challenges? Then get in touch with our experts right here!