scholarly journals MATHEMATICAL MODELLING OF WATER-QUALITY FOR LONG TIME PERIODS

1984 ◽  
Vol 1 (19) ◽  
pp. 207
Author(s):  
P. Huizinga
Keyword(s):  
Water Quality ◽  
Mathematical Modelling ◽  
Test Cases ◽  
Quality Model ◽  
One Dimensional ◽  
Long Time ◽  
Time Periods ◽  
Theoretical Test ◽  
Modelling Of Water Quality

This paper presents a one-dimensional dynamic water-quality model suitable for long-term application to estuaries. The computation techniques used in the model are very simple, but very good results have been obtained both for theoretical test cases and from applications to estuaries when compared with prototype measurements.

scholarly journals A Universal Law of Estuarine Mixing

2020 ◽  
Vol 50 (1) ◽  
pp. 81-93 ◽  
Author(s):  
Hans Burchard
Keyword(s):  
River Runoff ◽  
Numerical Test ◽  
Test Cases ◽  
Exchange Flow ◽  
One Dimensional ◽  
Estuarine Mixing ◽  
Flow Mixing ◽  
Universal Law ◽  
Total Exchange

AbstractA universal law of estuarine mixing is derived here, combining the approaches of salinity coordinates, Knudsen relations, total exchange flow, mixing definition as salinity variance loss, and the mixing–exchange flow relation. As a result, the long-term average mixing within an estuarine volume bounded by the isohaline of salinity S amounts to M(S) = S2Qr, where Qr is the average river runoff into the estuary. Consequently, the mixing per salinity class is m(S) = ∂SM(S) = 2SQr, which can also be expressed as the product of the isohaline volume and the mixing averaged over the isohaline. The major differences between the new mixing law and the recently developed mixing relation based on the Knudsen relations are threefold: (i) it does not depend on internal dynamics of the estuary determining inflow and outflow salinities (universality), (ii) it is exactly derived from conservation laws (accuracy), and (iii) it calculates mixing per salinity class (locality). The universal mixing law is demonstrated by means of analytical stationary and one-dimensional and two-dimensional numerical test cases. Some possible consequences for the salinity distribution in real estuaries are briefly discussed. Since the mixing per salinity class only depends on the river runoff and the chosen salinity, and not on local processes at the isohaline, low-mixing estuaries must have large isohaline volumes and vice versa.

Autonomous Acoustic Recording Packages (ARPs) for Long-Term Monitoring of Whale Sounds

2003 ◽  
Vol 37 (2) ◽  
pp. 13-22 ◽  
Author(s):  
Sean Wiggins
Keyword(s):  
Weather Conditions ◽  
High Data ◽  
West Antarctic ◽  
Data Capacity ◽  
Long Time ◽  
Long Term Monitoring ◽  
Time Periods ◽  
Acoustic Recording ◽  
Term Monitoring

Advancements in low-power and high-data capacity computer technology during the past decade have been adapted to autonomously record acoustic data from vocalizing whales over long time periods. Acoustic monitoring of whales has advantages over traditional visual surveys including greater detection ranges, continuous long-term monitoring in remote locations and in various weather conditions, and lower cost. An autonomous acoustic recording package (ARP) is described that uses a tethered hydrophone above a seafloor-mounted instrument frame. ARPs have been deployed to record baleen whale sounds in the Bering Sea, off the coast of southern California, near the West Antarctic Peninsula, and near Hawaii. ARP data have provided new information on the seasonal presence, abundance, call character, and patterns of vocalizing whales. Current development is underway for a broader-band, higher-data capacity system capable of recording odontocete whales, dolphins, and porpoises for long time periods.

scholarly journals One-Dimensional Water Quality Model for Water Management in Tidal Rivers.

1997 ◽  
Vol 25 ◽  
pp. 421-429
Author(s):  
P. SUDJONO ◽  
K. KOGA ◽  
H. ARAKI ◽  
K. WATANABE
Keyword(s):  
Water Management ◽  
Water Quality ◽  
Water Quality Model ◽  
Quality Model ◽  
One Dimensional ◽  
Tidal Rivers

Mousetrap: modelling of water quality processes and the interaction of sediments and pollutants in sewers

1995 ◽  
Vol 31 (7) ◽  
pp. 33-41 ◽  
Author(s):  
Henrik Garsdal ◽  
Ole Mark ◽  
Jesper Dørge ◽  
Svend-Erik Jepsen
Keyword(s):  
Water Quality ◽  
Water Quality Model ◽  
Quality Model ◽  
Aerobic Conditions ◽  
Sewer Systems ◽  
Gravity Sewer ◽  
Modelling Of Water Quality ◽  
Modelling Approach

A water quality model has been developed with the objective of describing the water quality processes in sewer systems. The model has the capability of simulating both dissolved and sediment attached pollutants. This paper describes the modelling approach for the water quality processes and it demonstrates a small application of the water quality model to a gravity sewer operating under aerobic conditions. The application shows that the transport of dissolved substances in sewers can be accurately described and that the water quality processes are simulated with acceptable results.

Calculation and Analysis of Water Quality Improvement Caused by Water Diversion in Nanjing Qinhuai River

2012 ◽  
Vol 256-259 ◽  
pp. 2528-2532
Author(s):  
Chao Feng Tong ◽  
Li Rui Lv ◽  
Yu Yang Shao ◽  
Jia Ling Hao
Keyword(s):  
Water Quality ◽  
Nutrient Loading ◽  
Water System ◽  
Water Diversion ◽  
Middle Reach ◽  
Quality Model ◽  
One Dimensional ◽  
The Impact ◽  
Qinhuai River

To explore the impact of changes in water quality of the Nanjing Inner Qinhuai River water system in different water diversion way and to assess the transfer effect, an one-dimensional hydrodynamic and water quality model for Inner Qinhuai River was established to simulate and analysis the responds of water quality on the different nutrient loading and different diverted water. Four different water discharges diverted from Xuanwu Lake and Exterior Qinhuai River and two loads including the present load and 50% reduction were considered. The result shows the water quality can be improved significantly only as enough water is diverted and the sewage is intercept in the Middle Reach of the Inner Qinhuai River.

scholarly journals Asymptotic Solution for a Water Quality Model in a Uniform Stream

2013 ◽  
Vol 2013 ◽  
pp. 1-4 ◽  
Author(s):  
Fazle Mabood ◽  
Nopparat Pochai
Keyword(s):  
Mathematical Modeling ◽  
Water Quality ◽  
Diffusion Reaction ◽  
Order Method ◽  
Quality Model ◽  
Reaction Equation ◽  
One Dimensional ◽  
Advection Diffusion ◽  
Optimal Homotopy Asymptotic Method ◽  
Uniform Stream

We employ approximate analytical method, namely, Optimal Homotopy Asymptotic Method (OHAM), to investigate a one-dimensional steady advection-diffusion-reaction equation with variable inputs arises in the mathematical modeling of dispersion of pollutants in water is proposed. Numerical values are obtained via Runge-Kutta-Fehlberg fourth-fifth order method for comparison purpose. It was found that OHAM solution agrees well with the numerical solution. An example is included to demonstrate the efficiency, accuracy, and simplicity of the proposed method.

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