Three-dimensional numerical modelling of water quality in Dahuofang Reservoir in China

Wang, Jinhua; Shen, Yongming; Hong, Zhen; Feng, Yue; Wang, Zaixing; Yang, Xu

doi:10.1007/s11433-011-4365-2

Cited by 9 publications

(1 citation statement)

References 32 publications

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“…The total phosphorus in the mid-1990s is about 6.5 times that of the early 1990s; with the total nitrogen and the permanganate index is about 1.43 and 1.34 times, respectively. Overall the water quality in recent years decreased gradually from Grade 2 to Grade 3 [11]. As the transport time scale is important related to the water circulation, the quantitative interpretation of water exchange time is necessary for better protecting and utilizing the environmental resources in this area.…”

Section: Introductionmentioning

confidence: 99%

Modeling study of residence time and water age in Dahuofang Reservoir in China

Shen

Wang

Zheng

et al. 2010

Sci. China Phys. Mech. Astron.

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Understanding the dynamics of water renewal in a reservoir is essential when the transport and fate of dissolved substances are evaluated. A three-dimensional hydrodynamic model was implemented to compute average residence time and water age in Dahuofang Reservoir in China. The model was verified for a one-year time period in 2006. A simulation reproduced intra-annual variation of mixing represented by the fall/winter mixing and the spring/summer stratification. The simulated variation of vertical thermal structures also matched observation. The spatially varying average residence times and age distribution were investigated through a series of numerical experiments using a passively dissolved and conservative tracer as a surrogate. Residence time estimations yield a broad range of values depending on the position. The average residence time for a tracer placed at the head of the reservoir under high-, mean-, and low flow conditions was found to be about 125, 236 and 521 days, respectively. The age simulation reveals that the age distribution is a function of the freshwater discharge. In the vertical direction, the age of the surface layers is larger than that of the bottom layers and the age difference between the surface and bottom layers decreases further downstream. The density-induced circulation plays an important role in the circulation in the reservoir, and can generate vertical age distribution in the reservoir. These findings provide useful information for understanding the transport process in Dahuofang Reservoir that can be used to assist the water quality management of the reservoir.Dahuofang reservoir, reservoir, three-dimensional model, residence time, age PACS: 92.40.qf, 92.40.Cy, 92.40.We, 47.85.Dh

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Section: Introductionmentioning

confidence: 99%

Modeling study of residence time and water age in Dahuofang Reservoir in China

Shen

Wang

Zheng

et al. 2010

Sci. China Phys. Mech. Astron.

Self Cite

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Effects of land use types on surface water quality across an anthropogenic disturbance gradient in the upper reach of the Hun River, Northeast China

Wang

et al. 2012

Environ Monit Assess

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Surface water quality is vulnerable to pollution due to human activities. The upper reach of the Hun River is an important water source that supplies 52 % of the storage capacity of the Dahuofang Reservoir, the largest reservoir for drinking water in Northeast China, which is suffering from various human-induced changes in land use, including deforestation, reclamation/farming, urbanization and mine exploitation. To investigate the impacts of land use types on surface water quality across an anthropogenic disturbance gradient at a local scale, 11 physicochemical parameters (pH, dissolved oxygen [DO], turbidity, oxygen redox potential, conductivity, biochemical oxygen demand [BOD5], chemical oxygen demand [COD], total nitrogen [TN], total phosphorus [TP], NO(3)(-)N, and NH(4)(+)-N) of water from 12 sampling sites along the upper reach of the Hun River were monitored monthly during 2009-2010. The sampling sites were classified into four groups (natural, near-natural, more disturbed, and seriously disturbed). The water quality exhibited distinct spatial and temporal characteristics; conductivity, TN, and NO(3)(-)-N were identified as key parameters indicating the water quality variance. The forest and farmland cover types played significant roles in determining the surface water quality during the low-flow, high-flow, and mean-flow periods based on the results of a stepwise linear regression. These results may provide incentive for the local government to consider sustainable land use practices for water conservation.

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Utilizing water characteristics and sediment nitrogen isotopic features to identify non-point nitrogen pollution sources at watershed scale in Liaoning Province, China

Chen

Huang

et al. 2014

Environ Sci Pollut Res

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Identifying nitrogen (N) pollution sources is the fundamental work of non-point source pollution load reduction from watersheds, but is hard due to complex N transport and transformation within spatially heterogenized huge areas. During September 2011, we measured water characteristics and sediment N stable isotope in four tributaries of the upper reach of the Hun River, an important water source of the Dahuofang Reservoir, a large drinking water source in Northeast China. Results showed that spatial changes in SO4 (2-) and Cl(-) contents in the tributaries were consisted with the changes in density of the population living along the tributaries. Sediment δ(15)N from all tributaries showed a downstream increasing trend in line with the land use change, which is characterized as more farmlands and more people around the outlet area of each tributary. Principal component analysis indicated the population density had a strong impact on N in these tributaries in the low-flow period. Tributaries and villages close to the Dahuofang Reservoir should be the major N load control objects in reduction of non-point source nitrogen load from the upper reach of the Hun River.

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Three-dimensional numerical modelling of water quality in Dahuofang Reservoir in China

Cited by 9 publications

References 32 publications

Modeling study of residence time and water age in Dahuofang Reservoir in China

Modeling study of residence time and water age in Dahuofang Reservoir in China

Effects of land use types on surface water quality across an anthropogenic disturbance gradient in the upper reach of the Hun River, Northeast China

Utilizing water characteristics and sediment nitrogen isotopic features to identify non-point nitrogen pollution sources at watershed scale in Liaoning Province, China

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