Research on Water Environmental Capacity of Urban River: A Case Study of Tuohe River in Suzhou City, Northern Anhui Province

2011 ◽  
Vol 356-360 ◽  
pp. 867-870 ◽  
Author(s):  
Shu Ling Huang ◽  
Yong Zhang ◽  
Qi Li ◽  
Dong Sheng Xu
Keyword(s):  
Water Quality ◽  
Water Environment ◽  
Design Procedure ◽  
River Pollution ◽  
Pollution Source ◽  
Residual Water ◽  
Environmental Capacity ◽  
Quality Model ◽  
Water Environmental Capacity ◽  
Current Water

Water environmental capacity is an important base for making the river pollution control, weakening the pollution source and realizing the water-function target. Analyses on the present situation of water quality in Suzhou reach of Tuohe River are conducted. The hydrological characteristics, the contamination characteristics and the water environment status were investigated. Combined with the design procedure of the water environment capacity, one-dimensional water quality model was selected to calculate and analyze the water environmental capacity of Tuohe River. The results showed that the water environmental capacity of BOD5 is 1231.16t/a, CODCr is 4289.73t/a and NH3-N is 377.3t/a. The current water quality of Tuohe River was good in general, most of the river’s sections have residual water environmental capacity and it is necessary to carry out total pollution reduction plans (especially for COD) in future with the population growth and socio-economic development.

scholarly journals Water Supply-Water Environmental Capacity Nexus in a Saltwater Intrusion Area under Nonstationary Conditions

Water ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 346
Author(s):  
Dedi Liu ◽  
Yujie Zeng ◽  
Yue Qin ◽  
Youjiang Shen ◽  
Jiayu Zhang
Keyword(s):  
Water Quality ◽  
Water Supply ◽  
Saltwater Intrusion ◽  
Water Environment ◽  
Environmental Capacity ◽  
Freshwater Flow ◽  
Environment Capacity ◽  
Water Environmental Capacity ◽  
Water Environment Capacity ◽  
Supply Water

Due to water supply increase and water quality deterioration, water resources are a critical problem in saltwater intrusion areas. In order to balance the relationship between water supply and water environment requirements, the nexus of water supply-water environment capacity should be well understood. Based on the Saint–Venant system of equations and the convection diffusion equation, the water supply-water environment capacity nexus physical equation is determined. Equivalent reliability is employed to estimate the boundary design water flow, which will then lead to a dynamic nexus. The framework for determining the nexus was then applied to a case study for the Pearl River Delta in China. The results indicate that the water supply-water environment capacity nexus is a declining linear relationship, which is different from the non-salt intrusion and tide-impacted areas. Water supply mainly relies on freshwater flow from upstream, while water environmental capacity is affected by both the design freshwater flow and the water levels at the downstream boundary. Our methods provide a useful framework for the quantification of the physical nexus according to the water quantity and water quality mechanisms, which are useful for freshwater allocation and management in a saltwater intrusion area or the tail area of cascade reservoirs.

Study on the Water Environmental Capacity and the Sewage Control of the Sushui River

2012 ◽  
Vol 433-440 ◽  
pp. 995-1001 ◽  
Author(s):  
Ji Zhong Bai ◽  
Jian Ming Yang ◽  
Min Quan Feng
Keyword(s):  
Water Quality ◽  
Ammonia Nitrogen ◽  
Environmental Capacity ◽  
Quality Model ◽  
Control Factors ◽  
Volatile Phenol ◽  
Water Environmental Capacity ◽  
The Status ◽  
State Water ◽  
Annual Water

In order to know the environmental capacity, improve the continual deterioration of the water quality in Sushui River, and promote the harmonious development of economy and aquatic environment, we did the following research. Based on the 1-D steady-state water quality model, the outfalls are generalized, and then we derived the formula for calculating water environmental capacity of each reach. According to the information of water quality, hydrology data and the discharge distribution of the river, we chose COD, ammonia nitrogen and volatile phenol as the main control factors, and some formulas were used to calculate the water environmental capacity of COD, ammonia nitrogen and volatile phenol. From which we got that annual water environmental capacity of COD, ammonia nitrogen and volatile phenol on the studied reach respectively arrive at 1257.897~1420.928t, 17.873~26.025t and 1.750~2.871t under different design terms. It is serious pollution in the Sushui River, combined with the status quo emissions, we found that under different design terms, the annual quantity of pollutants reduction of COD, ammonia nitrogen and volatile phenol arrive at 30.36×106t, 3.257×106t and 0.1745×106t.

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

Water ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 587
Author(s):  
Qiuxia Ma ◽  
Yong Pang ◽  
Ronghua Mu
Keyword(s):  
Water Quality ◽  
Yangtze River ◽  
Water Quality Management ◽  
Water Environment ◽  
Ammonia Nitrogen ◽  
The Yangtze River ◽  
Environmental Capacity ◽  
Water Environmental Capacity ◽  
Functional Zones ◽  
The Government

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.

Methods for Calculation of Water Environment Capacity of Small and Medium River Channels

2012 ◽  
Vol 610-613 ◽  
pp. 2745-2750 ◽  
Author(s):  
Long Xi Han ◽  
Fen Fen Yan ◽  
Hui Peng ◽  
Jun Jie Gao ◽  
Man Man Pan
Keyword(s):  
Water Quality ◽  
Water Resources ◽  
Water Environment ◽  
Pollution Source ◽  
River Channels ◽  
Quality Model ◽  
Environment Capacity ◽  
Water Resources Protection ◽  
Water Environment Capacity ◽  
Capacity Method

Methods for calculation of water environment capacity can be divided into two types in general, one type is ideal water environment capacity method and the other is pollution source generalization method. This paper proposes another way of generalization, uniform generalization method, assuming that distribution of the amount of pollutants discharged is uniform in the lengthways direction. In consideration of the practical demand for administration of water resources protection, a formula for calculation of water environment capacity for different combinations of environment function regions is presented，based on the water quality targets of function regions, with the numerical or analytical methods of 1-D water quality model. The proposed method provides a simple and effective method for water resources management and planning.

scholarly journals Research on Control Method of Pollutant Total Amount of Water Quality based on Fuzzy Mathematics

2020 ◽  
Vol 24 (2) ◽  
pp. 191-199
Author(s):  
Rui Liu
Keyword(s):  
Water Quality ◽  
Control Method ◽  
Comprehensive Evaluation ◽  
Water Environment ◽  
Pollution Source ◽  
Source Control ◽  
Fuzzy Mathematics ◽  
Quality Model ◽  
Control Framework ◽  
Pollutant Discharge

With the increase of pollutants discharged into the water, it is difficult to control the water environment pollution via reducing part of pollutant discharge. Therefore, the control method of pollutant total amount of water quality based on fuzzy mathematics is proposed. Firstly, a control framework and process of the pollutant total amount was built. The total amount of pollutant discharged into this region was controlled within a certain amount to achieve the predetermined environmental objective. Then, water pollution of different regions was evaluated via water quality model based on the fuzzy mathematics in the region or key protection domain with severe pollution and a concentrated pollution source, which makes the comprehensive evaluation of the water quality pollution more scientific. Finally, the control of pollutant total amount was completed via the optimized combination of point source control and unit control of total amount. Experimental results show that the method is scientific, objective and reasonable during controlling the pollutant discharge. It controls the pollutant total amount excellently.

scholarly journals Calculation of water environmental capacity of Puzhehei Lake

2021 ◽  
Vol 276 ◽  
pp. 01026
Author(s):  
Lei Sun ◽  
Wei Ma ◽  
Jing-ya Ban ◽  
De-xuan Qi
Keyword(s):  
Water Quality ◽  
Rainy Season ◽  
Water Quality Monitoring ◽  
Quality Data ◽  
Lake Basin ◽  
Environmental Capacity ◽  
Quality Model ◽  
Water Quality Data ◽  
Water Environmental Capacity ◽  
And Diffusion

The calculation of water environmental capacity of Puzhehei lake is of great significance for preventing water pollution and protecting water ecological environment of Puzhehei Lake Basin. Based on the lack of hydrological and water quality data in Puzhehei Lake Basin, a large number of basic data were collected through pollution source investigation and water quality monitoring. On this basis, a twodimensional hydrodynamic water quality model of Puzhehei lake was established by using Mike21 model to simulate the migration and diffusion of pollutants into the lake. The current situation of pollution load in Puzhehei lake was analyzed, and the characteristics of water flow, hydrodynamic force and the migration and diffusion law of pollutants in Puzhehei Lake were analyzed. The results show that: ①the annual loads of COD, TN, TP and NH3-N in puzhehai Lake in 2018 are 4090.0t, 401.3t, 34.4t and 122.6t; ②Puzhehei lake is mainly non-point source pollution, and the difference of water environmental capacity between non rainy season and rainy season is very significant.

scholarly journals Assessment of Water Quality Profile Using Numerical Modeling Approach in Major Climate Classes of Asia

2018 ◽  
Vol 15 (10) ◽  
pp. 2258 ◽  
Author(s):  
Muhammad Mazhar Iqbal ◽  
Muhammad Shoaib ◽  
Hafiz Umar Farid ◽  
Jung Lyul Lee
Keyword(s):  
Water Quality ◽  
Water Environment ◽  
Oxygen Demand ◽  
Surface Water Quality ◽  
Water Quality Model ◽  
Oxygen Solubility ◽  
Quality Model ◽  
Spatial Profile ◽  
Climatic Regions ◽  
Model Predictions

A river water quality spatial profile has a diverse pattern of variation over different climatic regions. To comprehend this phenomenon, our study evaluated the spatial scale variation of the Water Quality Index (WQI). The study was carried out over four main climatic classes in Asia based on the Koppen-Geiger climate classification system: tropical, temperate, cold, and arid. The one-dimensional surface water quality model, QUAL2Kw was selected and compared for water quality simulations. Calibration and validation were separately performed for the model predictions over different climate classes. The accuracy of the water quality model was assessed using different statistical analyses. The spatial profile of WQI was calculated using model predictions based on dissolved oxygen (DO), biological oxygen demand (BOD), nitrate (NO3), and pH. The results showed that there is a smaller longitudinal variation of WQI in the cold climatic regions than other regions, which does not change the status of WQI. Streams from arid, temperate, and tropical climatic regions show a decreasing trend of DO with respect to the longitudinal profiles of main river flows. Since this study found that each climate zone has the different impact on DO dynamics such as reaeration rate, reoxygenation, and oxygen solubility. The outcomes obtained in this study are expected to provide the impetus for developing a strategy for the viable improvement of the water environment.

scholarly journals Water Environmental Capacity Calculation and Allocation of the Taihu Lake Basin in Jiangsu Province Based on Control Unit

2019 ◽  
Vol 16 (19) ◽  
pp. 3774 ◽  
Author(s):  
Huang ◽  
Zhang ◽  
Tong
Keyword(s):  
Taihu Lake ◽  
Water Environment ◽  
Control Unit ◽  
Jiangsu Province ◽  
Lake Basin ◽  
Environmental Capacity ◽  
Taihu Lake Basin ◽  
Control Units ◽  
Water Environmental Capacity ◽  
Capacity Calculation

The water quality target management of the control unit is a convenient and direct technology for water environment management and the development direction of water environment management in China, involving control unit division and water environment capacity calculation. Taking the Taihu Lake Basin in Jiangsu Province as an example, we propose herein the basic principle of the division of a regional control unit in a plain river network and the method of analyzing the rationality of the control unit division. On this basis, the Taihu Lake Basin in Jiangsu Province was divided into 70 control units. To calculate the water environmental capacity in the plain river network area, we established a water environmental capacity calculation framework based on multiple targets of lakes and rivers, and proposed the goal of water quality "double compliance" of the water environmental functional zone and the assessment section. For this study, we calculated the regional water environmental capacity using the mathematical model of the Taihu Lake Basin’s water environmental capacity, and the water environmental capacities of the 70 control units were allocated by the weight coefficient method, which established water area and functional division length. The research results described herein were applied to the pollution permit management of the Taihu Lake Basin in Jiangsu Province. It provides important technical support for the establishment of a pollution permit system based on the total capacity to improve environmental quality.

Quantifying the impact of human activities on water quality based on spatialization of social data: a case study of the Pingzhai Reservoir Basin

2020 ◽  
Vol 20 (2) ◽  
pp. 688-699 ◽  
Author(s):  
Yongrong Zhang ◽  
Zhongfa Zhou ◽  
Haotian Zhang ◽  
Yusheng Dan
Keyword(s):  
Water Quality ◽  
River Basin ◽  
Human Activities ◽  
Water Environment ◽  
Oxygen Demand ◽  
Pollution Source ◽  
Pollution Load ◽  
Social Data ◽  
Reservoir Basin ◽  
The Impact

Abstract In water pollution source research, it is difficult to quantify the impact of human activities on water quality. Based on pollution load theory and the concept of spatialization of social data, this study integrates land-use type, slope gradient, and spatial position, and uses the contribution of human activities to quantify the impact of farmland fertilizers, livestock and poultry wastes, and human domestic pollution on water quality in the study area. The results show that livestock manure is the largest source of total phosphorus (TP) and total nitrogen (TN) discharges in the research area, and domestic pollution is the largest source of chemical oxygen demand (COD) discharges. The total equal standard pollution load (as well as the load of each pollution source and its pollutant amount) is the highest in the Nayong River Basin and the lowest in the Baishui River Basin. The contributions of human activities to TP and TN have similar spatial distributions. The impact of human activities on COD discharge is minimal. The quantitative results of this model are basically consistent with the actual conditions in the Pingzhai Reservoir Basin, which suggests that the model reasonably reflects the impact of human activities on the water environment of the basin.

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