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.
In November 2021, to coincide with Release 2022, our MIKE software prices will increase (for the first time in 3 years) by 3%. This will affect new purchases of Perpetual Licenses, Subscription Packages and Academic Licenses, and also the price of Essential SMA. SMA on Professional and University licenses is not affected by the price increase. In future, with each new major Release (normally scheduled in November), DHI will index all prices by global inflation, including SMA on Professional and University licenses.
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.
Using detailed coastal analysis to determine riverbank and coastal erosion
Protected from the Indian Ocean by the Macaneta Peninsula, the Lower Incomati Estuary in Mozambique is home to fishing and agriculture industries. Riverbank erosion in recent years has caused concern that the river could break through a narrow isthmus (a narrow strip of land that connects two larger areas of land), threatening these industries. Our detailed coastal analysis provided in-depth information on the state of the erosion. This enabled the Mozambican government to carefully weigh their options and decide whether protection measures were needed.
Erosion threat to local industries
Separated from the Indian Ocean by the Macaneta Peninsula, the Lower Incomati Estuary in southern Mozambique supports subsistence and commercial fishing and farming industries. Over the years, the local population has observed the rapid erosion of the riverbank in the valley.
This has led to fears that the Incomati River could permanently break through a narrow, 60 m wide isthmus that connects the Macaneta Peninsula to the mainland. If that were to occur, the main outflow of the river would shift upstream by 10 km. This could have severe environmental and socioeconomic consequences for the area. If the river finds a shorter path out to sea, salt intrusion will affect the river further upstream, impacting both the farming and fishing industries.
To determine the appropriate course of action, the Government of Mozambique needed to know:
Severe riverbank erosion
To help Mozambique obtain more in-depth information, we worked with NIRAS to perform a detailed coastal erosion study of the Macaneta Peninsula. First, we performed a site visit to examine the current state of erosion, analyse the state of the beach and the local geology, and collect sediment samples.
Next, we talked to the local population to gather anecdotal information to obtain a better idea of how the site looked in the past, as well as the frequency of overwash events – when high sea levels and large waves caused waves to wash over the isthmus and into the river.
We then compared current aerial images with aerial images from 1989 to determine historical erosion over the last 25 years. We found that severe erosion has occurred along certain stretches of the riverbank. The curved portion of the riverbank in the northern part of the isthmus is eroding at a rate of one metre per year. This is typical for meandering (bending) rivers like the Incomati. As water flows through a meandering river, the maximum flow speeds occur close to the outside banks of the curves. The riverbank in the southern part of the isthmus is eroding at a much slower rate.
A state of equilibrium
Despite the riverbank erosion, the isthmus has maintained its shape over the last 25 years. We found that overwash events transported sediment from the beach to the riverbank, compensating for the erosion. Although one might expect beach erosion due to this loss of sediment, our analysis of the aerial images indicates that this was not the case.
Using MIKE 21 Spectral Waves (SW), we assessed nearshore wave conditions along the Macaneta Peninsula. We ran the model for an eight-year period (2005-2013) corresponding to the period for which wave data was available. We found that waves approach the Macaneta Peninsula at a right angle due to the presence of Inhaca Island and a 35 km long shallow area off the coast.
Utilising the LITDRIFT module of LITPACK, we analysed sediment samples and calculated littoral drift (the transportation of sediments along a coast at an angle to the shoreline). We evaluated the direction of the sediment transport. We also determined the equilibrium orientation of the coast – when the beach faces straight towards the mean wave direction, resulting in zero net yearly sediment transport. We found that the Macaneta coast is stable as it is aligned with the equilibrium orientation determined from the wave conditions.Based on our analysis, the dynamics of the river and the sea seem to have reached a balanced state that maintains the isthmus. This means that the river is unlikely to break through the isthmus. If a breakthrough were to occur, it would likely be due to an extreme wave and water level event, such as a storm with surges and large waves. With this information, Mozambique now has a better understanding of the:
This will enable them to weigh and prioritise protection efforts in the future.
Improved clarity on the state of erosion
Clearer understanding of the river and coastal processes driving the erosion
Enabling the Mozambican government to determine the necessity of erosion protection measures
NIRAS, with the support of Danish International Development Agency (DANIDA)
MIKE 21 Spectra Waves (SW)LITPACK
Do you have challenges? Then get in touch with our experts right here!