Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

New evaporation model for water management

25.04.2002


"Formulas from 1948 were being used."

Monthly evaporation models, important for water management, can be improved by studying the dispersion of rain for each month. This is one of the conclusions in the research project of Marieke de Groen. She will defend her thesis on Monday the 29th of April. De Groen: “The subject was neglected for a long time. The monthly models contained formulas from 1948.”

Our main source of food – the agriculture sector – is very dependant on the weather. To determine whether it is wiser to build a dam, irrigate, or make better use of rainwater, monthly models are made. Evaporation plays an important part in these models. De Groen: “If you have 100 mm of rainfall in one month, it could al have fallen on one day, or maybe during 10 days. This is quite important for plants; after all, you don’t water your own plants only once a month.”



In her research, De Groen made a distinction between transpiration and interception. Transpiration is when water is absorbed by the plant through the roots and then evaporates through the leaves. Interception is when part of the rain-water doesn’t reach the ground, but lands on plant leaves and evaporates from there. “Transpiration causes plants to grow, interception doesn’t. That is why the distinction is important,” says De Groen. “This is also important in climate models. The classical models fall short on two points: they don’t take the dispersion of the rainfall over the month into account and they don’t deal with the difference between transpiration and interception.”

De Groen worked at the international hydraulics institute IHE in Delft, which does research in Zimbabwe. During her research period in Zimbabwe, she realised that the occurrence of ‘rain days’ takes place along the lines of the so-called Markov-theory. This means that the probability for rain on a certain day is only dependant on the amount of rain the day before. The theory helped De Groen to create simple monthly models for transpiration and interception. “The classical models simplistically assume that all the rain fell at the beginning of the month and they drastically simplify the relationship between the amount of water in the ground and the amount used by plants,” says De Groen, “I will show that you can make better models by using different assumptions, and they apply world-wide.”

The method developed by De Groen is especially valuable for water managers and hydrologists that depend on a limited amount of data in a limited time frame to be able to make strategic management decisions.



Maarten van der Sanden | alphagalileo
Further information:
http://www.tudelft.nl

More articles from Agricultural and Forestry Science:

nachricht New technique reveals details of forest fire recovery
17.05.2018 | DOE/Brookhaven National Laboratory

nachricht Mixed forests: ecologically and economically superior
09.05.2018 | Technische Universität München

All articles from Agricultural and Forestry Science >>>

The most recent press releases about innovation >>>

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

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...

Im Focus: Computer-Designed Customized Regenerative Heart Valves

Cardiovascular tissue engineering aims to treat heart disease with prostheses that grow and regenerate. Now, researchers from the University of Zurich, the Technical University Eindhoven and the Charité Berlin have successfully implanted regenerative heart valves, designed with the aid of computer simulations, into sheep for the first time.

Producing living tissue or organs based on human cells is one of the main research fields in regenerative medicine. Tissue engineering, which involves growing...

Im Focus: Light-induced superconductivity under high pressure

A team of scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg investigated optically-induced superconductivity in the alkali-doped fulleride K3C60under high external pressures. This study allowed, on one hand, to uniquely assess the nature of the transient state as a superconducting phase. In addition, it unveiled the possibility to induce superconductivity in K3C60 at temperatures far above the -170 degrees Celsius hypothesized previously, and rather all the way to room temperature. The paper by Cantaluppi et al has been published in Nature Physics.

Unlike ordinary metals, superconductors have the unique capability of transporting electrical currents without any loss. Nowadays, their technological...

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

Supersonic waves may help electronics beat the heat

18.05.2018 | Power and Electrical Engineering

Keeping a Close Eye on Ice Loss

18.05.2018 | Information Technology

CrowdWater: An App for Flood Research

18.05.2018 | Information Technology

VideoLinks
Science & Research
Overview of more VideoLinks >>>