Biochemical modeling of the Nhue River (Hanoi, Vietnam): Practical identifiability analysis and parameters estimation

Trinh, Anh Duc; Bonnet, Marie‐Paule; Vachaud, G.; Minh, Châu Văn; Prieur, Nicolas; Duc, Loi Vu; Anh, Le Lan

doi:10.1016/j.ecolmodel.2005.08.029

Cited by 38 publications

(19 citation statements)

References 31 publications

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“…The model also imitates changes with a user-opted time step inside of an hour within the daily cycle. In addition to being widely applied for the environmental management of relatively large rivers [12,18,19], the framework model also has several new features that make it applicable to shallow, upland and other rivers.…”

Section: Methodsmentioning

confidence: 99%

“…Some successful examples of QUAL2K have also been published in recent years [18,19,20,21,22], for instance, Fang et al [23] applied the QUAL2K model to evaluate the spatial distribution of BOD in the Qiantang River, Zhang et al [24] selected the optimal water quality improvement program via simulation of various hypothetical scenarios using the QUAL2K model, so the QUAL2K model was chosen for the present study due to its popularity and ease of application. Trial and error [25,26] is a method of reaching a correct solution or satisfactory result by trying out various means or theories until errors are sufficiently reduced or eliminated.…”

Section: Introductionmentioning

confidence: 99%

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Simulation of Water Environmental Capacity and Pollution Load Reduction Using QUAL2K for Water Environmental Management

Zhang

Qian

Yuan

et al. 2012

IJERPH

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In recent years, water quality degradation associated with rapid socio-economic development in the Taihu Lake Basin, China, has attracted increasing attention from both the public and the Chinese government. The primary sources of pollution in Taihu Lake are its inflow rivers and their tributaries. Effective water environmental management strategies need to be implemented in these rivers to improve the water quality of Taihu Lake, and to ensure sustainable development in the region. The aim of this study was to provide a basis for water environmental management decision-making. In this study, the QUAL2K model for river and stream water quality was applied to predict the water quality and environmental capacity of the Hongqi River, which is a polluted tributary in the Taihu Lake Basin. The model parameters were calibrated by trial and error until the simulated results agreed well with the observed data. The calibrated QUAL2K model was used to calculate the water environmental capacity of the Hongqi River, and the water environmental capacities of CODCr NH3-N, TN, and TP were 17.51 t, 1.52 t, 2.74 t and 0.37 t, respectively. The results showed that the NH3-N, TN, and TP pollution loads of the studied river need to be reduced by 50.96%, 44.11%, and 22.92%, respectively to satisfy the water quality objectives. Thus, additional water pollution control measures are needed to control and reduce the pollution loads in the Hongqi River watershed. The method applied in this study should provide a basis for water environmental management decision-making.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Simulation of Water Environmental Capacity and Pollution Load Reduction Using QUAL2K for Water Environmental Management

Zhang

Qian

Yuan

et al. 2012

IJERPH

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“…Previously, a 1-D numerical model was applied for calculation of longitudinal variation of water quality to the whole Nhue River 5) . However, attempts in calculation precisely water state around the confluence, such as back water effect in To Lich River or lateral stratification of water quality after mixing of two water masses was unsatisfactory because of limits of 1-D model.…”

Section: Simulation and Discussionmentioning

confidence: 99%

“…However, due to data deficiency, only one settling rate was selected for calculation. A value of 3.9 m/d was extracted from the work of Trinh et al 5) and applied for this model as settling rate of inorganic SS. The particulate organic detritus was formulated as a part of BOD.…”

Section: A) Transport Of Suspended Sedimentmentioning

confidence: 99%

Application of a 2-D Numerical Model for Computing Suspended Sediment and Nutrients Transports to Nhue River (Hanoi, Vietnam)

Trinh¹,

Akamatsu

Ikeda

et al. 2006

PROCEEDINGS OF HYDRAULIC ENGINEERING

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Since suspended sediment and organic matter loads were extremely high in Nhue River (Hanoi, Vietnam), a 2-D depth-average model was constructed to simulate hydrodynamic state, suspended sediment transport and environmental change around the confluence between Nhue River and its tributary, To Lich River. The biochemical conversions were constructed based on the QUAL2E conceptual scheme 1) . The model is capable of backwater simulation that was frequently seen there. The simulation results indicated a strong suspended sediment deposition. A clear deterioration of environment was simulated. Within few hundred meters from the confluence two water masses were incompletely mixed in normal discharge condition.

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“…Different applications in literature are available, for example in river water quality modelling (Chen & Deng 2006;Trinh Anh et al 2006;Arhonditsis et al 2008;Berber et al 2009), modelling of wastewater treatment plants Ferrero et al 2006;Ruano et al 2007;Sin & Vanrolleghem 2007) or modelling of biofilms (Brockmann et al 2006;Brockmann et al 2008). However, identifiabiiity issues in rainfall runoff modelling have received relatively little attention in the urban drainage community with only a few studies available (Freni et al 2009, 2on).…”

Section: Introductionmentioning

confidence: 98%

Identifiability analysis in conceptual sewer modelling

Kleidorfer

Leonhardt

Rauch

2012

Water Science and Technology

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For a sufficient calibration of an environmental model not only parameter sensitivity but also parameter identifiability is an important issue. In identifiability analysis it is possible to analyse whether changes in one parameter can be compensated by appropriate changes of the other ones within a given uncertainty range. Parameter identifiability is conditional to the information content of the calibration data and consequently conditional to a certain measurement layout (i.e. types of measurements, number and location of measurement sites, temporal resolution of measurements etc.). Hence the influence of number and location of measurement sites on the number of identifiable parameters can be investigated. In the present study identifiability analysis is applied to a conceptual model of a combined sewer system aiming to predict the combined sewer overflow emissions. Different measurement layouts are tested and it can be shown that only 13 of the most sensitive catchment areas (represented by the model parameter 'effective impervious area') can be identified when overflow measurements of the 20 highest overflows and the runoff to the waste water treatment plant are used for calibration. The main advantage of this method is very low computational costs as the number of required model runs equals the total number of model parameters. Hence, this method is a valuable tool when analysing large models with a long runtime and many parameters.

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Biochemical modeling of the Nhue River (Hanoi, Vietnam): Practical identifiability analysis and parameters estimation

Cited by 38 publications

References 31 publications

Simulation of Water Environmental Capacity and Pollution Load Reduction Using QUAL2K for Water Environmental Management

Simulation of Water Environmental Capacity and Pollution Load Reduction Using QUAL2K for Water Environmental Management

Application of a 2-D Numerical Model for Computing Suspended Sediment and Nutrients Transports to Nhue River (Hanoi, Vietnam)

Identifiability analysis in conceptual sewer modelling

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