Calculation of water environmental capacity of large shallow lakes – a case study of Taihu Lake

Hu, Kaiming; Wang, Yunyan; Bao, Feng; Wu, Dan; Tong, Yifan; Zhang, Xiaoqiang

doi:10.2166/wp.2020.076

Cited by 9 publications

(4 citation statements)

References 38 publications

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“…Compared with other domestic waters, the concentrations of nitrogen and phosphorus in Huanglonggou are higher than those in Dianchi Lake and Taihu Lake From the statistical data, the individual point of the concentration of nitrogen and phosphorus in Huanglonggou has exceeded the internationally recognized critical concentration of eutrophication: c (TN) is 0.3 mg L –1 , c (TP) is 0.02 mg L –1 , indicating that the source elements of nitrogen and phosphorus can fully meet the needs of algae growth. Once the flow pattern (velocity, depth, etc.)…”

Section: Resultsmentioning

confidence: 92%

Water Environmental Characteristics and Eutrophication Evaluation of Alpine Karst Mountains in Huanglong, Sichuan, China

Gao

Zhang

Sun³

et al. 2023

ACS Earth Space Chem.

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Travertine deposits are formed after CO2 is degassed from deep karst water at the Huanglong Scenic Area, a World Natural Heritage Site. In recent years, various levels of eutrophication have occurred in travertine waters, resulting in large areas of algal mats that have severely affected the continued deposition of travertine and its appreciable value. The research on hydrochemical types, hydrochemical components, and pollution characteristics of surface water and groundwater in Huanglong National Scenic Area, a World Natural Heritage, is beneficial to the evaluation and management of regional water resources and landscape development. In June 2022, 14 groups of surface water and groundwater samples were collected from Huanglong. Mathematical statistics were used to analyze the water’s chemical characteristics, the Piper three-plot was used to analyze the water’s chemical types, and Gibbs and Gaillardet model were used to discuss the sources and influencing factors of main ions in surface water. The eutrophication degree of regional water was evaluated by the single factor index method. The results show that most of the groundwater in the study area belongs to weakly alkaline water. The cations are mainly Ca2+, the anions are mainly HCO3 –, and the hydrochemical type is HCO3–Ca. The major contribution of TDS comes from Ca2+ and HCO3 –. According to the analysis of water–rock model, the hydrochemical origin of surface water in the study area is mainly controlled by rock weathering, and most ions are influenced by the water–rock interaction of carbonate rocks, with the existence of reverse cation exchange. The spatial and temporal distribution characteristics of nitrogen, phosphorus, and carbon are obvious. Eutrophication evaluation showed that Huanglong was in a medium eutrophication state.

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Section: Resultsmentioning

confidence: 92%

Water Environmental Characteristics and Eutrophication Evaluation of Alpine Karst Mountains in Huanglong, Sichuan, China

Gao

Zhang

Sun³

et al. 2023

ACS Earth Space Chem.

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“…Currently, lakes globally are encountering significant environmental issues related to water such as declining water quality, worsening eutrophication, decreasing biodiversity, and coastal environmental damage. Improving the quality of lake water and preventing and controlling the damage to lake water ecosystems are urgent issues that have attracted the attention of scholars at home and abroad (Song et al, 2014;Hu et al, 2020;Li et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Is water replenishment an effective way to improve lake water quality? Case study in Lake Ulansuhai, China

Liu,

Yang,

Cui

et al. 2024

Front. Environ. Sci.

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Lakes are an important component of the global water cycle and aquatic ecosystem. Lake water quality improvement have always been a hot topic of concern both domestically and internationally. Noncompliant outflow water quality frequently occurs, especially for lakes that rely mainly on irrigation return flow as their water source. External water replenishment to improve the water quality of lakes is gradually being recognized as a promising method, which however, is also a controversial method. Lake managers, in the case of constant controversy, hesitate about the appropriateness of lake water replenishing. Thus, taking Lake Ulansuhai in China as an example, this study aimed to construct a lake hydrodynamic and water quality model, under the constraint of multiple boundary conditions, that has sufficient simulation accuracy, and to simulate and analyze the changes in COD (Chemical Oxygen Demand) and TN (Total Nitrogen) concentrations in the lake area before and after water replenishment, and explore whether water replenishment was an effective method for improving lake water quality. The results showed that when the roughness value of Lake Ulansuhai was 0.02, the TN degradation coefficient K was 0.005/d, and the COD degradation coefficient K was 0.01/d; the simulation and measured values had the best fit, and the built model is reasonable and reliable can be used to simulate lake water quality changes. By external water replenishment lasting 140 days in the water volume of 4.925 × 108 m³, the COD and TN concentrations in Lake Ulansuhai could be stabilized at the Class V water quality requirement, which helped improve the self-purification ability of the lake area. Water replenishment was proved to be an effective method for improving the water quality of the lake, but water replenishment is only an emergency measure. Lake water replenishment is more applicable to areas with abundant water resources. External source control and internal source reduction of lake pollution and protection of lake water ecology are the main ways to improve lake water quality for water-deficient areas under the rigid constraints of water resources. In the future, key technologies for reducing and controlling pollution in irrigation areas, construction of lake digital twin platforms, and active promotion of lake legislation work should be the main research direction for managing the lake water environment.

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“…In order to further protect the water ecological environment, it is necessary to study the water environmental capacity (WEC), which refers to the maximum amount of pollutants that can be contained in a water body while maintaining normal function [6,7], based on hydraulic modeling that can calculate the flow direction, flow volume, and water quality transport [8]. Widely used models include the Streeter-Phelos (S-P) model [9][10][11][12], the MIKE model [13], the Environmental Fluid Dynamics Code (EFDC) model [14], the Water Quality Analysis Simulation Program (WASP) model [15][16][17], the Quality Simulation Along River Systems (QUASAR) model [18], the Soil and Water Assessment Tool (SWAT) model, the Modular Three-dimensional Finite-difference Ground-water Flow Model (MOD-FLOW) [19], and the Stream Water Quality Model (QUAL2K) [20,21].…”

Section: Introductionmentioning

confidence: 99%

Water Environmental Capacity Calculation Based on Control of Contamination Zone for Water Environment Functional Zones in Jiangsu Section of Yangtze River, China

Pang

2021

Water

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In recent years, due to unsustainable production methods and the demands of daily life, the water quality of the Yangtze River has deteriorated. In response to Yangtze River protection policy, and to protect and restore the ecological environment of the river, a two-dimensional model of the Jiangsu section was established to study the water environmental capacity (WEC) of 90 water environment functional zones. The WEC of the river in each city was calculated based on the results of the water environment functional zones. The results indicated that the total WECs of the study area for chemical oxygen demand (COD), ammonia nitrogen (NH3-N), and total phosphorus (TP) were 251,198 t/year, 24,751 t/year, and 3251 t/year, respectively. Among the eight cities studied, Nanjing accounted for the largest proportion (25%) of pollutants discharged into the Yangtze River; Suzhou (11%) and Zhenjiang (12%) followed, and Wuxi contributed the least (0.4%). The results may help the government to control the discharge of pollutants by enterprises and sewage treatment plants, which would improve the water environment and effectively maintain the water ecological function. This research on the WEC of the Yangtze River may serve as a basis for pollution control and water quality management, and exemplifies WEC calculations of the world’s largest rivers.

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Calculation of water environmental capacity of large shallow lakes – a case study of Taihu Lake

Cited by 9 publications

References 38 publications

Water Environmental Characteristics and Eutrophication Evaluation of Alpine Karst Mountains in Huanglong, Sichuan, China

Water Environmental Characteristics and Eutrophication Evaluation of Alpine Karst Mountains in Huanglong, Sichuan, China

Is water replenishment an effective way to improve lake water quality? Case study in Lake Ulansuhai, China

Water Environmental Capacity Calculation Based on Control of Contamination Zone for Water Environment Functional Zones in Jiangsu Section of Yangtze River, China

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