scholarly journals Impact of Spring Freshet Flooding and Summer Rainfall Flooding on the Water Quality of an Alpine Barrier Lake

2019 ◽  
Author(s):  
Chun-hua LI ◽  
Chun Ye ◽  
Ji-xuan LI ◽  
Wei-wei WEI ◽  
Ye ZHENG ◽  
...  
Keyword(s):  
Water Quality ◽  
Flow Field ◽  
Summer Rainfall ◽  
Lake Area ◽  
Quality Model ◽  
Barrier Lake ◽  
Pollutant Concentrations ◽  
Spring Freshet ◽  
Seasonal Water Quality ◽  
Flooding Period

Abstract Background: Among the many types of lakes, the barrier lake attracts special attention. China’s Lake Jingpo is one of the world’s rare such alpine lakes. Spring freshet flooding and summer rainfall flooding are factors that significantly increase barrier lake instability while also impacting water quality. Results: This study constructed a hydrodynamic water-quality model to simulate the impacts of spring freshet flooding, summer rainfall flooding, and 30-year frequency rainfall flooding on the flow-field and water quality at Lake Jingpo. Results showed that the lake-area flow field was generally weak (mostly lower than 0.015 m/s), but spring freshet flooding in April and summer rainfall flooding in August-September increase flow velocities to 0.045 m/s and above, much higher than in other months. Mudanjiang is the largest river that enters Lake Jingpo. Its flow reaches 4.81×10 8 m 3 , 29.77×10 8 m 3 , and 58.4×10 8 m 3 during the spring freshet flooding, summer rainfall flooding and 30-year frequency rainfall flooding period, respectively. The longest diffusion distances were measured from the lake mouth to the point of impact; these were 16.3 km, 33.1km, and 43.6km for the above periods, respectively. Our research revealed that precipitation played an important role in seasonal water quality at Lake Jingpo, and larger amounts of precipitation, longer diffusion distances, and increased pollutant concentrations. Conclusions: Compared to the effects of the spring freshet flooding period, the summer rainfall flooding and 30-year frequency rainfall flooding period more significantly affected water quality at Lake Jingpo. There was more overall precipitation, longer diffusion distances, and increased pollutant concentrations in the lake area. Alpine barrier lake environments are very fragile, which need greater care efforts and more stringent measures to control pollution sources throughout entire catchment area.

scholarly journals Impact of Spring Freshet Flooding and Summer Rainfall Flooding on the Water Quality of an Alpine Barrier Lake

2020 ◽  
Author(s):  
Chun-hua LI ◽  
Chun Ye ◽  
Ji-xuan LI ◽  
Wei-wei WEI ◽  
Ye ZHENG ◽  
...  
Keyword(s):  
Water Quality ◽  
Summer Rainfall ◽  
Quality Data ◽  
Sudden Increase ◽  
Water Quality Data ◽  
Barrier Lake ◽  
Spring Freshet ◽  
The Impact ◽  
Flooding Period ◽  
Mike 21

Abstract Background: Barrier lakes, formed by river interception, are particularly influenced by the upstream river. As such, spring freshet flooding and summer rainfall flooding due to wet precipitation (e.g. snow and rainfall) may sharply increase the concentrations of nitrogen, phosphorous and carbon compounds in barrier lakes. Too much nutrients will lead to lake eutrophication. In this study, we used Lake Jingpo, the world’s second largest alpine barrier lake, to examine the impact of spring freshet flooding and summer rainfall flooding on its water quality by building a hydrodynamic water-quality model with MIKE 21. Results:The MIKE 21 HD hydrodynamic model and MIKE 21 AD convection and diffusion module were calibrated using meteorological data, hydrological data, and water quality data collected in 2018. All errors were in the acceptable range. According to model simulation results, the flow velocity in Lake Jingpo is generally weak (mostly lower than 0.015 m/s), but it increases to 0.045 m/s and above during spring freshet flooding (April–May) and summer rainfall flooding (August–September), which is much higher than in other months. The flow volume of its largest inflowing river reaches 4.81×108 m3, 29.77×108 m3, and 58.4×108 m3 during spring freshet flooding, summer rainfall flooding, and 30-year frequency rainfall flooding period, respectively. The longest diffusion distances from the lake mouth to the downstream way are 16.3 km, 33.1 km, and 43.6 km during the spring freshet flooding, summer rainfall flooding, and 30-year frequency rainfall flooding period, respectively. A larger amount of precipitation leads to longer diffusion distances and increased concentrations of total nitrogen (TN), total phosphorous (TP), chemical oxygen demand (CODMn), and ammonia-nitrogen (NH4-N) in the lake. Conclusions: The sudden increase in water volume during spring flooding and summer rainfall flooding led to the rapid spread of nutrients and pollutants carried by the water into the barrier lake, resulting in a deterioration of lake water quality. In addition to pollution source control measures, ecological restoration and the construction of a buffer system in the catchment are very important measures to effectively improve the buffer capacity of barrier lakes in light of spring freshet flooding and summer rainfall flooding.

scholarly journals Impact of spring freshet flooding and summer rainfall flooding on the water quality of an alpine barrier lake

2020 ◽  
Vol 32 (1) ◽  
Author(s):  
Chun-hua Li ◽  
Chun Ye ◽  
Ji-xuan Li ◽  
Wei-wei Wei ◽  
Ye Zheng ◽  
...  
Keyword(s):  
Water Quality ◽  
Summer Rainfall ◽  
Barrier Lake ◽  
Spring Freshet

Research on the Pollution Diffusion Regularity near Sewage Outlet Areas in Yuncheng Reach of the Fen River

2011 ◽  
Vol 383-390 ◽  
pp. 2430-2436
Author(s):  
Jian Hua Hou ◽  
Min Quan Feng ◽  
Xiao Peng Xing ◽  
Zhen Hua Hou
Keyword(s):  
Water Quality ◽  
Flow Field ◽  
Water Depth ◽  
Concentration Gradient ◽  
River Flow ◽  
Measured Data ◽  
Quality Model

The purpose of this paper is to find the pollution diffusion regularity near sewage outlet area of Yuncheng reach of the Fen River. A 2-D water hydrodynamic and quality model was used to simulate flow field, the water quality and contamination dispersion. The parameters of the model were calibrated with measured data of the water depth, flow and water quality in Yuncheng reach of the Fen River. According to the simulated result, the total area of pollution belt with 19 sewage outlets is 8.89km2 in normal year. And 3.89% of the reach has a worse water quality than V class in standard. The percentage of V and Ⅳ Class of water is 69.17% and 26.94%.In dry year, the total area of pollution belt with 19 sewage outlets is 8.89km2.The percentage of inferior V, V and Ⅳ Class of water is 27.80%, 69.46% and 2.74%. It was shown by the simulated results that the concentration gradient decreases with increasing distance to the outlets and the dilution and dispersion of pollutants was enhanced by a greater river flow.

Impact of summer rainfall on the seasonal water quality variation (chlorophyll a) in the regulated Nakdong River

2011 ◽  
Vol 15 (6) ◽  
pp. 983-994 ◽  
Author(s):  
Kwang-Seuk Jeong ◽  
Dong-Kyun Kim ◽  
Hyun-Suk Shin ◽  
Ju-Duk Yoon ◽  
Hyun-Woo Kim ◽  
...  
Keyword(s):  
Water Quality ◽  
Chlorophyll A ◽  
Summer Rainfall ◽  
Nakdong River ◽  
Water Quality Variation ◽  
Seasonal Water Quality ◽  
Quality Variation

scholarly journals The hydrodynamic and environmental characteristics of tributary bay influenced by backwater jacking and intrusion of main reservoir

2020 ◽  
Author(s):  
Xintong Li ◽  
Bing Liu ◽  
Yuanming Wang ◽  
Yongan Yang ◽  
Ruifeng Liang ◽  
...  
Keyword(s):  
Water Quality ◽  
Flow Field ◽  
Water Level ◽  
Water Environment ◽  
Quality Model ◽  
Environmental Characteristics ◽  
Concentration Boundary ◽  
The Three Gorges ◽  
Regional Boundary

Abstract. The construction of large reservoirs results in the formation of tributary bays, and tributary bays are inevitably influenced by the backwater jacking and intrusion of the main reservoir. The hydrodynamic conditions and the environmental factors of tributary bays exhibit complex distribution characteristics and eutrophication occur frequently. Thus, exploring the distribution and evolution of the hydrodynamic and water environment characteristics of tributary bays in response to backwater jacking and intrusion is the key to solving eutrophication and other problems relevant to water environment. In this paper, a typical tributary bay (Tangxi River) of the Three Gorges Reservoir (TGR) was selected to study the hydrodynamic and environmental characteristics of the tributary bay influenced by the jacking and intrusion of the main reservoir. The flow field, water temperature and water quality of the Tangxi River were simulated using the hydrodynamic and quality model CE-QUAL-W2, and the eutrophication status of the tributary bay was also evaluated. The results showed that the main reservoir had different effects on its tributary bay in each month. The tributary bay was mainly affected by backwater jacking of the main reservoir when the water level dropped and by intrusion of the main reservoir when the water level rose. An obvious quality concentration boundary existed in the tributary bay, which was basically consistent with the regional boundary in the flow field. The flow field and water quality on both sides of the boundary were quite different. The results of this study can help us figure out how the backwater jacking and intrusion of the main reservoir influence the hydrodynamic and water environment characteristics of the tributary bay and provide guidance for water environment protection in the tributary bays.

scholarly journals Numerical Simulation of a One-Dimensional Water-Quality Model in a Stream Using a Saulyev Technique with Quadratic Interpolated Initial-Boundary Conditions

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Pawarisa Samalerk ◽  
Nopparat Pochai
Keyword(s):  
Numerical Simulation ◽  
Water Quality ◽  
Boundary Condition ◽  
Diffusion Reaction ◽  
Quality Model ◽  
Reaction Equation ◽  
One Dimensional ◽  
Advection Diffusion ◽  
Pollutant Concentrations ◽  
The One

The one-dimensional advection-diffusion-reaction equation is a mathematical model describing transport and diffusion problems such as pollutants and suspended matter in a stream or canal. If the pollutant concentration at the discharge point is not uniform, then numerical methods and data analysis techniques were introduced. In this research, a numerical simulation of the one-dimensional water-quality model in a stream is proposed. The governing equation is advection-diffusion-reaction equation with nonuniform boundary condition functions. The approximated pollutant concentrations are obtained by a Saulyev finite difference technique. The boundary condition functions due to nonuniform pollutant concentrations at the discharge point are defined by the quadratic interpolation technique. The approximated solutions to the model are verified by a comparison with the analytical solution. The proposed numerical technique worked very well to give dependable and accurate solutions to these kinds of several real-world applications.

scholarly journals Hydrodynamic and environmental characteristics of a tributary bay influenced by backwater jacking and intrusions from a main reservoir

2020 ◽  
Vol 24 (11) ◽  
pp. 5057-5076
Author(s):  
Xintong Li ◽  
Bing Liu ◽  
Yuanming Wang ◽  
Yongan Yang ◽  
Ruifeng Liang ◽  
...  
Keyword(s):  
Water Quality ◽  
Flow Field ◽  
Water Level ◽  
Water Environment ◽  
Quality Model ◽  
Environmental Characteristics ◽  
Concentration Boundary ◽  
The Three Gorges ◽  
Regional Boundary

Abstract. The construction of large reservoirs results in the formation of tributary bays, and tributary bays are inevitably influenced by backwater jacking and intrusions from the main reservoir. In this paper, a typical tributary bay (Tangxi River) of the Three Gorges Reservoir (TGR) was selected to study the hydrodynamic and environmental characteristics of a tributary bay influenced by the jacking and intrusions from the main reservoir. The flow field, water temperature, and water quality of Tangxi River were simulated using the hydrodynamic and water quality model CE-QUAL-W2 (thomas and Scott, 2008), and the eutrophication status of the tributary bay was also evaluated. The results showed that the main reservoir had different effects on its tributary bay in each month. The tributary bay was mainly affected by backwater jacking from the main reservoir when the water level of the main reservoir dropped and by intrusions from the main reservoir when the water level of the main reservoir rose. An obvious water quality concentration boundary existed in the tributary bay, which was consistent with the regional boundary in the flow field. The flow field and water quality on both sides of the boundary were quite different. The results of this study can help us figure out how the backwater jacking and intrusions from the main reservoir influence the hydrodynamic and water environment characteristics of the tributary bay and provide guidance for water environment protection in tributary bays.

A parameter identifiability and estimation study in Yesilirmak River

2009 ◽  
Vol 59 (3) ◽  
pp. 515-521 ◽  
Author(s):  
R. Berber ◽  
M. Yuceer ◽  
E. Karadurmus
Keyword(s):  
Water Quality ◽  
River Water ◽  
Effective Means ◽  
River Water Quality ◽  
Quality Data ◽  
Model Parameters ◽  
Quality Model ◽  
Water Quality Data ◽  
Parameter Identifiability ◽  
Pollutant Concentrations

Water quality models have relatively large number of parameters, which need to be estimated against observed data through a non-trivial task that is associated with substantial difficulties. This work involves a systematic model calibration and validation study for river water quality. The model considered was composed of dynamic mass balances for eleven pollution constituents, stemming from QUAL2E water quality model by considering a river segment as a series of continuous stirred-tank reactors (CSTRs). Parameter identifiability was analyzed from the perspective of sensitivity measure and collinearity index, which indicated that 8 parameters would fall within the identifiability range. The model parameters were then estimated by an integration based optimization algorithm coupled with sequential quadratic programming. Dynamic field data consisting of major pollutant concentrations were collected from sampling stations along Yesilirmak River around the city of Amasya in Turkey, and compared with model predictions. The calibrated model responses were in good agreement with the observed river water quality data, and this indicated that the suggested procedure provided an effective means for reliable estimation of model parameters and dynamic simulation for river streams.

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