scholarly journals Dynamic simulation of sediment resuspension and its effect on water quality in Lake Taihu, China

2017 ◽  
Vol 17 (5) ◽  
pp. 1335-1346 ◽  
Author(s):  
Jianjian Wang ◽  
Qiaohua Zhao ◽  
Yong Pang ◽  
Yiping Li ◽  
Zhiguo Yu ◽  
...  
Keyword(s):  
Water Quality ◽  
Wind Speed ◽  
Spatial Variation ◽  
Central Region ◽  
Release Rate ◽  
Pollution Control ◽  
Lake Taihu ◽  
Sediment Resuspension ◽  
Water Safety ◽  
Sediment Release

Quantitative studies on sediment release fluxes and their impact on water quality are important for water pollution control, ecological restoration, water safety, and human health. In this study, we conducted high-frequency, synchronous field observations of meteorology, hydrology, and water quality to determine the relationship between sediment release rate and wind speed in the central region of Lake Taihu. We combined these results with our previous findings from other regions to establish the temporal–spatial variation in sediment release patterns for this lake. We then calculated the annual total nitrogen (TN) and total phosphorus (TP) release fluxes. We constructed an environmental fluid dynamics code (EFDC) model; we then loaded the temporal–spatial variation parameters and simulated the effects on different TN and TP concentrations. Overall, the following results were observed: (1) the critical wind speed at which sediment was first suspended in the central region of the lake was 4 m/s, and the fitted curve of the sediment release rate and wind speed was r = 144.7x−100 (R2 = 0.851); and (2) the annual TN and TP release fluxes of Lake Taihu were approximately 3,086 and 740 tons, respectively. This research would provide a basis for decision-making regarding pollution control in this region.

The regularity of wind-induced sediment resuspension in Meiliang Bay of Lake Taihu

2014 ◽  
Vol 70 (1) ◽  
pp. 167-174 ◽  
Author(s):  
Jianjian Wang ◽  
Yong Pang ◽  
Yiping Li ◽  
Yawen Huang ◽  
Junjie Jia ◽  
...  
Keyword(s):  
Wind Speed ◽  
Release Rate ◽  
Lake Taihu ◽  
Sediment Resuspension ◽  
Quantitative Relationship ◽  
Phosphorus Release ◽  
Hydrodynamic Conditions ◽  
Wind Speeds ◽  
Resuspension Rate ◽  
Meiliang Bay

Contaminants released by wind-induced sediment resuspension could influence the water quality in shallow lakes. This study aims to reveal the quantitative relationship between wind speed (v) and sediment resuspension rate (r) in Meiliang Bay of Lake Taihu. The study was conducted in three steps. First, the in situ wind speed and current velocity were measured over a period of 2 days in Meiliang Bay to establish the relationship between wind and hydrodynamic conditions; second, an indoor experiment was conducted in a cylindrical simulator with sediment from the study area to determine sediment resuspension rates under different hydrodynamic conditions; and third, linkages between sediment resuspension and wind were determined. The average sediment resuspension rate was highly correlated with the wind speed (R2 = 0.99), and was expressed by r = 20.72v2.034 at wind speeds in the range of 0–14 m/s. The critical wind speed for sediment resuspension is about 7 m/s. Under these conditions, the average resuspension rate could reach 1,000 g/(m2d), with a total phosphorus release rate of 1.1 g/(m2d) and a total nitrogen release rate of 18.1 g/(m2d).

Simulation study on water quality based on sediment release flume experiment in Lake Taihu, China

2011 ◽  
Vol 37 (4) ◽  
pp. 607-615 ◽  
Author(s):  
Kaiming Hu ◽  
Yong Pang ◽  
Hua Wang ◽  
Xianmin Wang ◽  
Xinwei Wu ◽  
...  
Keyword(s):  
Water Quality ◽  
Simulation Study ◽  
Lake Taihu ◽  
Flume Experiment ◽  
Sediment Release

scholarly journals Spatiotemporal Patterns and Threshold of Chlorophyll-a in Lake Taihu Based on Microcystins

2021 ◽  
Author(s):  
xuemei fu ◽  
Mingxia Zheng ◽  
Jing Su ◽  
Beidou Xi ◽  
Daichun Wu ◽  
...  
Keyword(s):  
Water Quality ◽  
Drinking Water ◽  
Chlorophyll A ◽  
Lake Taihu ◽  
Water Quality Management ◽  
Water Security ◽  
Water Safety ◽  
Chl A ◽  
Guideline Value ◽  
Guideline Values

Abstract Chlorophyll-a (Chl- a ) is considered an indicator of phytoplankton biomass dynamically reflecting the growth of algae. Therefore, determination of Chl- a threshold is of vital importance to the health of aquatic ecosystems and drinking water security. This research is aimed to investigate the spatial and temporal distributions of Chl- a and microcystin (MC) concentrations using Geographic Information System (GIS) and identify the Chl- a threshold in Lake Taihu based on available guideline values of MCs. Nearly the same characteristics of spatiotemporal variation of Chl- a and MCs were observed in Lake Taihu. Overall, the lakewide distributions of Chl- a and MCs were highly variable over time and space. The Chl- a concentration in the winter and spring was relatively low, and gradually increasing in summer and autumn, with the maximum concentration observed in August. But the maximum MCs concentration appeared in October, two months lagging behind the Chl- a . The highest annual average Chl- a and MCs concentrations were observed in Zhushan Bay, Meiliang Bay, Gonghu Bay in northwest of Lake Taihu, following by West Zone and Center Zone. Dongtaihu Bay, East Zone and South Zone always present good water quality. Referring to the guideline value of MCs, the Chl- a threshold was determined as 10-15 mg·m -3 based on the linear regression correlation between Chl- a and MCs. The establishment of Chl- a threshold is useful for eutrophication control, water quality management and drinking water utilities in developing water safety plans.

Water Quality and Health

1991 ◽  
Vol 23 (1-3) ◽  
pp. 201-209 ◽  
Author(s):  
W. Kreisel
Keyword(s):  
Water Quality ◽  
Developing Countries ◽  
Drinking Water ◽  
Water Supply ◽  
Human Health ◽  
Pollution Control ◽  
Wastewater Reuse ◽  
Water Supplies ◽  
Minimum Quality Standards ◽  
Quality Guidelines

Water quality can affect human health in various ways: through breeding of vectors, presence of pathogenic protozoa, helminths, bacteria and viruses, or through inorganic and organic chemicals. While traditional concern has been with pathogens and gastro-intestinal diseases, chemical pollutants in drinking-water supplies have in many instances reached proportions which affect human health, especially in cases of chronic exposure. Treatment of drinking-water, often grossly inadequate in developing countries, is the last barrier of health protection, but control at source is more effective for pollution control. Several WHO programmes of the International Drinking-Water Supply and Sanitation Decade have stimulated awareness of the importance of water quality in public water supplies. Three main streams have been followed during the eighties: guidelines for drinking-water quality, guidelines for wastewater reuse and the monitoring of freshwater quality. Following massive investments in the community water supply sector to provide people with adequate quantities of drinking-water, it becomes more and more important to also guarantee minimum quality standards. This has been recognized by many water and health authorities in developing countries and, as a result, WHO cooperates with many of them in establishing water quality laboratories and pollution control programmes.

Large-scale wetland-restoration of the Ronde Venen, The Netherlands

1995 ◽  
Vol 31 (8) ◽  
pp. 197-205 ◽  
Author(s):  
L. L. Bijlmakers ◽  
E. O. A. M. de Swart
Keyword(s):  
Water Quality ◽  
Wetland Restoration ◽  
Pollution Control ◽  
Large Scale ◽  
Major Elements ◽  
Control Mechanisms ◽  
Important Criterion ◽  
Spatial Strategy ◽  
Hydrological Characteristics ◽  
Spatial Composition

For the area of the Ronde Venen a plan for large-scale wetland-restoration and improvement of the water quality was developed. Major elements of the developed spatial strategy are the optimal use of the specific hydrological and ecological characteristics of the area. Based on regional hydrological characteristics within the study area hydrological sub-units were distinguished by connecting discharge and recharge areas. In this way the intake of polluted surface water from outside the area could be minimized, with an optimal use of specific local differences in water quality. Two scenarios were developed and evaluated using hydrological, hydrochemical and ecological models. The scenarios differed in spatial composition and the way the water level was manipulated. In order to optimize water quality, natural and artificial pollution control mechanisms were implemented as well. An important criterion for the evaluation was the extent to which the scenarios succeeded in optimizing conditions for the realization of the ecological goals. The most promising and acceptable scenario has been worked out in further detail.

Spatio‐temporal dynamics of water quality and eutrophication in Lake Taihu, China

Ecohydrology ◽  
2021 ◽  
Author(s):  
Qiongfang Li ◽  
Yuting Zhu ◽  
Qihui Chen ◽  
Yu Li ◽  
Jing Chen ◽  
...  
Keyword(s):  
Water Quality ◽  
Temporal Dynamics ◽  
Lake Taihu ◽  
Spatio Temporal

Environment Study on Liaohe River Basin Ecological Footprint and Ecological Restoration Measures

2013 ◽  
Vol 830 ◽  
pp. 372-375 ◽  
Author(s):  
Yang Wang ◽  
Yu Min Shi ◽  
Jun Zhao
Keyword(s):  
Water Quality ◽  
Environmental Pollution ◽  
Ecological Restoration ◽  
River Basin ◽  
Pollution Control ◽  
Ecological Footprint ◽  
Liaohe River ◽  
Environment Study ◽  
Liaohe River Basin ◽  
Restoration Measures

Liaohe River is one of seven big river in China, its environmental pollution control is an important task all the time. In this paper, Liaohe River basin ecological footprint was introduced, water quality and ecological restoration measures were analyzed in the period of the 9th Five-Year, the 10th Five-Year and the 11th Five-Year, the development on ecological restoration in the 12th Five-Year was put forward.

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