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 Successful calculation of human and natural influence on cloud formation
04.11.2016 | Goethe-Universität Frankfurt am Main

nachricht Invasive Insects Cost the World Billions Per Year
04.10.2016 | University of Adelaide

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: Novel silicon etching technique crafts 3-D gradient refractive index micro-optics

A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.

Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...

Im Focus: Quantum Particles Form Droplets

In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.

“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...

Im Focus: MADMAX: Max Planck Institute for Physics takes up axion research

The Max Planck Institute for Physics (MPP) is opening up a new research field. A workshop from November 21 - 22, 2016 will mark the start of activities for an innovative axion experiment. Axions are still only purely hypothetical particles. Their detection could solve two fundamental problems in particle physics: What dark matter consists of and why it has not yet been possible to directly observe a CP violation for the strong interaction.

The “MADMAX” project is the MPP’s commitment to axion research. Axions are so far only a theoretical prediction and are difficult to detect: on the one hand,...

Im Focus: Molecules change shape when wet

Broadband rotational spectroscopy unravels structural reshaping of isolated molecules in the gas phase to accommodate water

In two recent publications in the Journal of Chemical Physics and in the Journal of Physical Chemistry Letters, researchers around Melanie Schnell from the Max...

Im Focus: Fraunhofer ISE Develops Highly Compact, High Frequency DC/DC Converter for Aviation

The efficiency of power electronic systems is not solely dependent on electrical efficiency but also on weight, for example, in mobile systems. When the weight of relevant components and devices in airplanes, for instance, is reduced, fuel savings can be achieved and correspondingly greenhouse gas emissions decreased. New materials and components based on gallium nitride (GaN) can help to reduce weight and increase the efficiency. With these new materials, power electronic switches can be operated at higher switching frequency, resulting in higher power density and lower material costs.

Researchers at the Fraunhofer Institute for Solar Energy Systems ISE together with partners have investigated how these materials can be used to make power...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

ICTM Conference 2017: Production technology for turbomachine manufacturing of the future

16.11.2016 | Event News

Innovation Day Laser Technology – Laser Additive Manufacturing

01.11.2016 | Event News

#IC2S2: When Social Science meets Computer Science - GESIS will host the IC2S2 conference 2017

14.10.2016 | Event News

 
Latest News

UTSA study describes new minimally invasive device to treat cancer and other illnesses

02.12.2016 | Medical Engineering

Plasma-zapping process could yield trans fat-free soybean oil product

02.12.2016 | Agricultural and Forestry Science

What do Netflix, Google and planetary systems have in common?

02.12.2016 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>