Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Dynamic bed causes irregular course of river

20.12.2005


How can you manage and design rivers such that no floods occur, whilst still ensuring navigation for shipping and a continuation of the agricultural, ecological and recreational functions? Dutch researcher Saskia van Vuren discovered that uncertainties in the behaviour of the riverbed play an important role in predicting the effects of design measures, such as lowering floodplains.



In view of future large-scale projects, such as river improvement measures in the project ’Ruimte voor de rivier’ [Room for the River], the societal relevance of responsible river management is increasing. The large-scale spatial redesigning of the Rhine Branches could result in greater dynamics in the riverbed, which could give rise to more problems for shipping. That might lead to increasing costs for maintenance dredging. Moreover an increase in the riverbed dynamics might also affect the high-water levels. Saskia van Vuren investigated the uncertainty in riverbed dynamics.

Changes in the riverbed elevation can give rise to high-water problems and flooding, drought problems which hinder shipping, problems with respect to the discharge distribution at bifurcation points, and erosion problems. Fluctuations in the groundwater level caused by these so-called morphological changes can exert an influence on the local ecology and agriculture. In her thesis, Van Vuren uses examples to illustrate how insights into the uncertain behaviour of the riverbed can support managers in the design, management and maintenance of the river.


A closer look at the Rhine

The researcher evaluated the effect of various river improvement measures along the Rhine on the riverbed, such as lowering floodplains, constructing secondary channels, and setting back dikes. Some locations were found to be more sensitive to management measures than others. This comes to light in the average changes, the variability and the seasonal dependency of the shape of the riverbed.

At present, the hydraulic models used by river managers for high-water level predictions often assume a fixed bed elevation. Van Vuren discovered that mid-term variations in the bed elevation and bed activity around bifurcation points influence high-water levels. This being the case the researcher argues that in future, high-water level predictions must take morphological dynamics (how the riverbed changes in response to altered circumstances) into account.

Saskia van Vuren’s research was funded by Technology Foundation STW.

Saskia van Vuren M.Sc. | alfa
Further information:
http://www.nwo.nl/nwohome.nsf/pages/NWOA_6JSKGN_Eng

More articles from Ecology, The Environment and Conservation:

nachricht Dispersal of Fish Eggs by Water Birds – Just a Myth?
19.02.2018 | Universität Basel

nachricht Removing fossil fuel subsidies will not reduce CO2 emissions as much as hoped
08.02.2018 | International Institute for Applied Systems Analysis (IIASA)

All articles from Ecology, The Environment and Conservation >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: LZH showcases laser material processing of tomorrow at the LASYS 2018

At the LASYS 2018, from June 5th to 7th, the Laser Zentrum Hannover e.V. (LZH) will be showcasing processes for the laser material processing of tomorrow in hall 4 at stand 4E75. With blown bomb shells the LZH will present first results of a research project on civil security.

At this year's LASYS, the LZH will exhibit light-based processes such as cutting, welding, ablation and structuring as well as additive manufacturing for...

Im Focus: Self-illuminating pixels for a new display generation

There are videos on the internet that can make one marvel at technology. For example, a smartphone is casually bent around the arm or a thin-film display is rolled in all directions and with almost every diameter. From the user's point of view, this looks fantastic. From a professional point of view, however, the question arises: Is that already possible?

At Display Week 2018, scientists from the Fraunhofer Institute for Applied Polymer Research IAP will be demonstrating today’s technological possibilities and...

Im Focus: Explanation for puzzling quantum oscillations has been found

So-called quantum many-body scars allow quantum systems to stay out of equilibrium much longer, explaining experiment | Study published in Nature Physics

Recently, researchers from Harvard and MIT succeeded in trapping a record 53 atoms and individually controlling their quantum state, realizing what is called a...

Im Focus: Dozens of binaries from Milky Way's globular clusters could be detectable by LISA

Next-generation gravitational wave detector in space will complement LIGO on Earth

The historic first detection of gravitational waves from colliding black holes far outside our galaxy opened a new window to understanding the universe. A...

Im Focus: Entangled atoms shine in unison

A team led by Austrian experimental physicist Rainer Blatt has succeeded in characterizing the quantum entanglement of two spatially separated atoms by observing their light emission. This fundamental demonstration could lead to the development of highly sensitive optical gradiometers for the precise measurement of the gravitational field or the earth's magnetic field.

The age of quantum technology has long been heralded. Decades of research into the quantum world have led to the development of methods that make it possible...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Save the date: Forum European Neuroscience – 07-11 July 2018 in Berlin, Germany

02.05.2018 | Event News

Invitation to the upcoming "Current Topics in Bioinformatics: Big Data in Genomics and Medicine"

13.04.2018 | Event News

Unique scope of UV LED technologies and applications presented in Berlin: ICULTA-2018

12.04.2018 | Event News

 
Latest News

Designer cells: artificial enzyme can activate a gene switch

22.05.2018 | Life Sciences

PR of MCC: Carbon removal from atmosphere unavoidable for 1.5 degree target

22.05.2018 | Earth Sciences

Achema 2018: New camera system monitors distillation and helps save energy

22.05.2018 | Trade Fair News

VideoLinks
Science & Research
Overview of more VideoLinks >>>