Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

A coupled numerical hydrodynamic water quality model of the river environment

10.06.2013
Because of the combination of environmental change and economic and social development, there are new pressures on the development and use of water resources.

After 5 years of innovative research, Professor WANG Jianhua and his group, from the State Key Laboratory of Simulation and Regulation of the Water Cycle in River Basins of the China Institute of Water Resources and Hydropower Research, have developed a new coupled numerical hydrodynamic water quality model of the river environment.

The model has been applied in the Luan River Basin where the model parameters were calibrated and validated. Their work, entitled "Integrated Simulation and Assessment of Water Quantity and Quality for a River Under Changing Environmental Conditions", has been published in the Chinese Science Bulletin (In Chinese, 2013, No.12).

Because of the increasing cumulative effects of the environment on water quality, many aquatic systems cannot meet the demands for water resource development and use. In general terms, water quantity and quality simulation and assessment methods have several shortcomings, for example, water quantity and quality are assessed separately, they are assessed at limited spatial and temporal scales, assessment is static rather than dynamic and objects are evaluated individually.

To address these problems, and to help us understand the interactions between water quantity and quality in different water bodies, we need to develop a comprehensive assessment method using current available information on water resources, and on pollutants that are generated by hydrological processes, such as runoff generation, conflux, and drainage. In short, we urgently need to establish dynamic methods for integrated simulation and assessment of river water quantity and quality.

The river hydrodynamic model was validated by comparing water level and flow data collected at the Guojiatun and Sandaohezi stations on the main stem of the Luan River in 2006. Water level and flow were simulated at these sites, and compared with actual data (Figure 1). The results showed that the difference between the simulated and observed flow was less than 10% for 85% and 82% of the flow data from the Guojiatun and Sandaohezi stations, while 90% of the differences between simulated and observed water level were less than 10%, all of which fully satisfied the accuracy requirements for the model application.

The area of the Panjiakou Reservoir fits into a maximum of 64 grid cells in the horizontal direction and 69 grid cells in the vertical direction. This means that, when the horizontal computing unit is 1 km and the vertical computing unit is1m, there are 2246 calculated grid cells. The measured TN and TP concentrations were used to validate the water quality characteristics of the reservoir. Validation results are shown in Figure 2. Comparison of the monitored and simulated values showed that the average error for each sampling site was 12% for TP and 9% for TN. Although some sites had relatively large errors, overall, the model satisfied the application requirements.

Under constantly changing environmental conditions, it is clear that dynamic changes in river water quantity and quality are closely related, so we need to develop new scientific methods for integrated simulation and assessment of these two characteristics of water. In this study, we constructed and validated an integrated model to simulate river system hydrodynamics and water quality. The validation indicated that the error between the simulated and monitored values was comparatively small, demonstrating that (1) the model satisfied the demands for its application and (2) it was possible to simulate integrated dynamic changes in water quantity and quality.

The water environment in the Luan River Basin has been dramatically altered because of global climatic change and highly insensitive human activities. Results of the integrated dynamic assessment model for water quantity and quality show that the water in the upper reaches of the Luan River Basin were classified from type I to type V as follows: 11.9% (type I), 16.9%, 32.3%, 14.2%, 19.4% and 5.3% (type V). In addition, the water quality of the main water body of the Panjiakou Reservoir was classified as type IV.

We need integrated water quality and quantity simulation and assessment for effective water resource management. Although we have achieved integrated simulation and assessment of river systems, we still need to improve statistical analyses of inflows of both point and diffuse source pollutants. In addition, the current hydrology and water quality monitoring data series are relatively short, so the conclusions from integrated simulation and assessment cannot show either the impacts of anthropogenic activities or climate change. Therefore, there is a need for further research on the integrated simulation and assessment of water quantity and quality under changing environmental conditions.

See the article: Wang J H, Xiao W H, Wang H, et al. Integrated simulation and assessment of water quantity and quality for a river under changing environmental conditions. Chin Sci Bull, 2013, 58(12): 1101-1108 doi: 10.1007/s11434-012-5622-0

http://csb.scichina.com:8080/kxtb/CN/abstract/abstract510189.shtml#
Science China Press Co., Ltd. (SCP) is a scientific journal publishing company of the Chinese Academy of Sciences (CAS). For 50 years, SCP takes its mission to present to the world the best achievements by Chinese scientists on various fields of natural sciences researches.

WANG Jianhua | EurekAlert!
Further information:
http://www.zh.scichina.com/english/

More articles from Ecology, The Environment and Conservation:

nachricht Upcycling 'fast fashion' to reduce waste and pollution
03.04.2017 | American Chemical Society

nachricht Litter is present throughout the world’s oceans: 1,220 species affected
27.03.2017 | Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung

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: Making lightweight construction suitable for series production

More and more automobile companies are focusing on body parts made of carbon fiber reinforced plastics (CFRP). However, manufacturing and repair costs must be further reduced in order to make CFRP more economical in use. Together with the Volkswagen AG and five other partners in the project HolQueSt 3D, the Laser Zentrum Hannover e.V. (LZH) has developed laser processes for the automatic trimming, drilling and repair of three-dimensional components.

Automated manufacturing processes are the basis for ultimately establishing the series production of CFRP components. In the project HolQueSt 3D, the LZH has...

Im Focus: Wonder material? Novel nanotube structure strengthens thin films for flexible electronics

Reflecting the structure of composites found in nature and the ancient world, researchers at the University of Illinois at Urbana-Champaign have synthesized thin carbon nanotube (CNT) textiles that exhibit both high electrical conductivity and a level of toughness that is about fifty times higher than copper films, currently used in electronics.

"The structural robustness of thin metal films has significant importance for the reliable operation of smart skin and flexible electronics including...

Im Focus: Deep inside Galaxy M87

The nearby, giant radio galaxy M87 hosts a supermassive black hole (BH) and is well-known for its bright jet dominating the spectrum over ten orders of magnitude in frequency. Due to its proximity, jet prominence, and the large black hole mass, M87 is the best laboratory for investigating the formation, acceleration, and collimation of relativistic jets. A research team led by Silke Britzen from the Max Planck Institute for Radio Astronomy in Bonn, Germany, has found strong indication for turbulent processes connecting the accretion disk and the jet of that galaxy providing insights into the longstanding problem of the origin of astrophysical jets.

Supermassive black holes form some of the most enigmatic phenomena in astrophysics. Their enormous energy output is supposed to be generated by the...

Im Focus: A Quantum Low Pass for Photons

Physicists in Garching observe novel quantum effect that limits the number of emitted photons.

The probability to find a certain number of photons inside a laser pulse usually corresponds to a classical distribution of independent events, the so-called...

Im Focus: Microprocessors based on a layer of just three atoms

Microprocessors based on atomically thin materials hold the promise of the evolution of traditional processors as well as new applications in the field of flexible electronics. Now, a TU Wien research team led by Thomas Müller has made a breakthrough in this field as part of an ongoing research project.

Two-dimensional materials, or 2D materials for short, are extremely versatile, although – or often more precisely because – they are made up of just one or a...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Expert meeting “Health Business Connect” will connect international medical technology companies

20.04.2017 | Event News

Wenn der Computer das Gehirn austrickst

18.04.2017 | Event News

7th International Conference on Crystalline Silicon Photovoltaics in Freiburg on April 3-5, 2017

03.04.2017 | Event News

 
Latest News

Bare bones: Making bones transparent

27.04.2017 | Life Sciences

Study offers new theoretical approach to describing non-equilibrium phase transitions

27.04.2017 | Physics and Astronomy

From volcano's slope, NASA instrument looks sky high and to the future

27.04.2017 | Earth Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>