scholarly journals Non-point source pollution and long-term effects of best management measures simulated in the Qifeng River Basin in the Karst Area of Southwest China

2020 ◽  
Author(s):  
Liang Liying ◽  
Qin Litang ◽  
Peng Guangsheng ◽  
Zeng Honghu ◽  
Liu Zheng ◽  
...  
Keyword(s):  
Point Source ◽  
Agricultural Watershed ◽  
Karst Area ◽  
Long Term Effects ◽  
Point Source Pollution ◽  
Best Management ◽  
Nps Pollution ◽  
Management Measures ◽  
Non Point Source Pollution

Abstract Non-point source (NPS) pollution has caused serious threats to water quality on a global scale. However, the investigation using a single measure with multi-scenarios for the long-term simulation in karst agricultural watershed is still lacking. In this study, the Annualized Agricultural Non-Point Source Pollution (AnnAGNPS) model was developed to verify the applicability in a karst agricultural watershed. Then, the model was used to determine the best management measures (BMPs) and the reduction rate characteristics under long-term effects (about 10 years) in the watershed. The AnnAGNPS model perform well in simulating in NPS pollution with R2 (0.95 for runoff, 0.93 for TN, and 0.93 for TP, respectively) and NSE (0.95 for runoff, 0.53 for TN, and 0.57 for TP, respectively). The output of total nitrogen (TN) and total phosphorous (TP) primarily occurred in the rainy season (up to 80%). The loss of mass of TN and TP were mainly observed in orchards and woodlands in the upstream of each sub-basin. The results from AnnAGNPS model demonstrated that different BMPs had significant impacts on the reduction of NPS pollution. Furthermore, a same BMPs measure showed it was closely related to land use in the watershed. In the Qifeng River watershed, stubble tillage (ST) showed to be useful with relatively good reduction rates (16.64% for sediment, 17.85% for TN, and 17.80% for TP, respectively). The simulation results indicated that AnnAGNPS was a valuable tool after validation for the planning and management of the watershed in karst areas.

scholarly journals Long-Term Effects of Anthropogenic Factors on Nonpoint Source Pollution in the Upper Reaches of the Yangtze River

2019 ◽  
Vol 11 (8) ◽  
pp. 2246 ◽  
Author(s):  
Xiaowen Ding ◽  
Lin Liu
Keyword(s):  
Point Source ◽  
Pollution Control ◽  
Yangtze River ◽  
Agricultural Land ◽  
Anthropogenic Factors ◽  
The Yangtze River ◽  
Long Term Effects ◽  
Point Source Pollution ◽  
Non Point Source Pollution

With the continuous enhancement of point source pollution control, non-point source (NPS) pollution has become an important factor in the deterioration of surface water quality. Meanwhile, due to the soaring global population, long-term effects of anthropogenic factors on non-point source pollution in large river basins have increasingly attracted worldwide attention. The Yangtze river is the largest river basin of China, and protecting its ecological environment has great significance on protecting the lifeline of the entire Yangtze river. In this study, the improved output coefficient and nutrient losses empirical model were used to conduct space–time simulations of non-point source pollution in the upper reaches of the Yangtze river (URYR) based on GIS during 1960–2003. This method reveals the anthropogenic effects of non-point source pollution in the upper reaches of the Yangtze river. The results indicate that the impacts of anthropogenic factors on dissolved pollutants increased significantly, while those on sediment and adsorbed pollutants increased first and then decreased during the simulation year. Agricultural land use and atmospheric deposition, as well as rural life, were the main sources of dissolved pollutants. In addition, dry land and paddy fields were the major sources of sediment and adsorbed pollutants. For the load intensities, the long-term effects of anthropogenic factors on dissolved pollutants increased rapidly, and those on the load intensity of sediment and adsorbed pollutants increased first and then decreased. Therefore, the study would propose some corresponding environmental management measures to strengthen environmental protection and non-point source pollution control in the upper reaches of the Yangtze river.

Research on the Pattern of Comprehensive Improvement of Small Watershed Pollution in Guangxi Province

2014 ◽  
Vol 535 ◽  
pp. 394-398
Author(s):  
Hong Chen ◽  
Chun Yi Duan
Keyword(s):  
Point Source ◽  
Industrial Pollution ◽  
Control Measures ◽  
Small Watershed ◽  
Guangxi Province ◽  
Point Source Pollution ◽  
Pollution Remediation ◽  
Non Point Source Pollution

This paper concern the difficulties of comprehensive improvement of small watershed pollution. There were some patterns of comprehensive improvement of small watershed pollution, which include industrial pollution, domestic pollution, non-point source polluting, and rural non-point source pollution in small watershed. We put out control measures of these pollution and long-term mechanism of mall basin pollution remediation

scholarly journals Optimum Detailed Standards to Control Non-Point Source Pollution Priority Management Areas: Centered on Highland Agriculture Watershed

2021 ◽  
Vol 13 (17) ◽  
pp. 9842
Author(s):  
Jinsun Kim ◽  
Baekyung Park ◽  
Jiyeon Choi ◽  
Minji Park ◽  
Jong Mun Lee ◽  
...  
Keyword(s):  
Point Source ◽  
Suspended Solids ◽  
Natural Ecosystem ◽  
Geologic Structure ◽  
Point Source Pollution ◽  
Legal Provisions ◽  
Nps Pollution ◽  
Management Area ◽  
Field Area ◽  
Non Point Source Pollution

The Ministry of Environment in Korea aims to reduce non-point source (NPS) pollution and improve soil water management by expanding NPS priority management areas. Six NPS priority management areas to reduce suspended solids (SS) according to soil loss were chosen as they either constitute serious hazards to the natural ecosystem due to NPS pollutants or they are areas with unusual geologic structure or strata. Although more comprehensive standards are required for effective NPS management, however, no detailed consideration factors and standards are available in the legal provisions. Therefore, in this study, based on the existing six priority NPS management areas and using results from previous studies, we present detailed legal designation standards. We found that the higher the altitude, slope, and field area ratio, the higher the effect of SS on water quality during rainfall. Additionally, there is a high correlation as R2 0.9813 between SS and the habitat and riparian index. These results are useful for establishing detailed standards for areas requiring an NPS management system, future expansion of the NPS priority management area designation, and policymaking and research for reducing NPS pollution in Korea.

scholarly journals Framework to prioritize watersheds for diffuse pollution management in the Republic of Korea: application of multi-criteria analysis using the Delphi method

2019 ◽  
Vol 19 (12) ◽  
pp. 2767-2779 ◽  
Author(s):  
Gyumin Lee ◽  
Kyung Soo Jun ◽  
Minji Kang
Keyword(s):  
Decision Making ◽  
Point Source ◽  
Best Management Practices ◽  
Delphi Technique ◽  
Management Practices ◽  
Point Sources ◽  
Republic Of Korea ◽  
Point Source Pollution ◽  
Best Management ◽  
Non Point Source Pollution

Abstract. This study aimed to develop a risk-based approach for determining control areas to manage non-point source pollution, developing a framework to prioritize catchments by considering the characteristics of polluted runoff from non-point sources. The best management, decision-making, and scientific approaches, such as the technique for order of preference by similarity to ideal solution (TOPSIS) and the Delphi technique, are required for the designation of control areas and the application of the best management practices to the control areas. Multi-criteria decision-making (MCDM) methods can handle the diversity and complexity of non-point source pollution. The Delphi technique was employed for selecting the assessment criteria/sub-criteria and determining their weights. Sub-criteria for each catchment unit were scored with either a quantitative or qualitative scale. All non-point pollution sources in mainland Republic of Korea were included, with the exception of a few islands, with catchment prioritization and pollution vulnerability evaluations shown as thematic maps. This study contributes to the field by developing a new risk-based approach for ranking and prioritizing catchments; this provides valuable information for the Ministry of Environment to use to identify control areas and manage non-point source pollution.

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