scholarly journals Analysis of the Water Quality Improvement in Urban Stream Using MIKE 21 FM

2021 ◽  
Vol 11 (19) ◽  
pp. 8890
Author(s):  
Dongwoo Jang
Keyword(s):  
Water Quality ◽  
Quality Improvement ◽  
Reclaimed Water ◽  
Urban Streams ◽  
Base Flow ◽  
Quality Data ◽  
Urban Stream ◽  
Water Quality Improvement ◽  
Before And After ◽  
Mike 21

Domestic urban streams face insufficient base flow and consequently become dry streams in drought season, and vulnerable to water quality deterioration and ecological impairment, due to contaminants introduced from the urban pollutants. Many efforts are being made to improve the natural flow by actively enforcing restoration projects of urban streams. Gulpocheon is a national stream flowing through Incheon-si and Gimpo-si. As of March 2019, the reclaimed wastewater or the ozone-processed Gulpo treated sewage has formed the upper part of Gulpocheon. This study aimed to analyze the improvement in water quality of Gulpocheon before and after supplying the reclaimed water by collecting the water quality data of the target area. Before and after providing the base flow, the water quality was analyzed using the two-dimensional numerical analysis model, i.e., MIKE 21 FM. The water quality one year before and after supplying the reclaimed water was compared, with a focus on DO, BOD, TN, and TP; they are used as water quality standards for stream water. The concentration of DO at all spots of Gulpocheon increased on average. The concentration of BOD, TN, and TP water quality parameters decreased, indicating water quality improvement. In addition, accurate water quality assessment is possible using MIKE 21 FM model simulation for urban stream analysis.

scholarly journals The Hydraulic Driving Mechanisms of Cyanobacteria Accumulation and the Effects of Flow Pattern on Ecological Restoration in Lake Dianchi Caohai

2019 ◽  
Vol 16 (3) ◽  
pp. 361 ◽  
Author(s):  
Peng Zhang ◽  
Rui-Feng Liang ◽  
Peng-Xiao Zhao ◽  
Qing-Yuan Liu ◽  
Yong Li ◽  
...  
Keyword(s):  
Water Quality ◽  
Quality Improvement ◽  
Flow Pattern ◽  
Ecological Restoration ◽  
Quality Data ◽  
Quality Improvements ◽  
Lake Dianchi ◽  
Water Quality Data ◽  
Water Quality Improvement ◽  
Wind Driven Circulation

Due to rapid increases in socioeconomic development and the human population over the past few decades, the shallow lakes in China have suffered from eutrophication and poor water quality. The conditions in Lake Dianchi Caohai, which is in the northern part of Lake Dianchi, are considered the most serious. The ecological restoration of Lake Dianchi Caohai began in the late 1980s. Lake managers and the public have been puzzled by the lack of a significant response of the water quality to the flow pattern despite the tremendous investment in water quality improvements. Therefore, lake managers desperately need to understand the responses of pollutant behaviors to proposed management measures. In this paper, a depth-averaged two-dimensional hydrodynamic and water quality model based on hydrological data, measured lake bed elevation, and water quality data is developed to simulate the flow field and water quality of Lake Dianchi Caohai. This model was validated using water quality data from the Caohaizhongxin site in 2016, and a close agreement was found between the model results and observations. Wind-driven circulation in Lake Dianchi Caohai was observed in the model results, which revealed that the lake flow pattern was dominated by wind-driven circulation, while the inflow/outflow played only a subsidiary role during this period. The formation of the wind-driven current in Lake Dianchi Caohai could be roughly divided into three stages. The hydrodynamic processes connected with the distribution of chlorophyll a are evaluated and discussed to adequately understand the hydraulic mechanisms driving the accumulation of cyanobacteria. Moreover, we designed three scenarios after comparing all possible operation scenarios to analyze the contributions of each different operation scenario to the water quality improvements. The optimal ecological operation scenario which has the best impacts on the water quality, especially the reduction in Chla and NH3-N concentration, is proposed based on our comprehensive analysis. The water quality improvement and management suggestions proposed in this paper are based on lake flow patterns and make up for previous studies that did not consider the effects of hydraulic characteristics on water quality improvement in Lake Dianchi Caohai.

Using Multi-Function Constructed Wetland for Urban Stream Restoration

2011 ◽  
Vol 121-126 ◽  
pp. 3072-3076
Author(s):  
Chun Yi Wu ◽  
Yu Tung Fu ◽  
Zong Han Yang ◽  
Chih Ming Kao ◽  
Yao Ting Tu
Keyword(s):  
Water Quality ◽  
Quality Improvement ◽  
Constructed Wetland ◽  
Stream Water ◽  
Urban Stream ◽  
Natural Ecosystem ◽  
Stream Water Quality ◽  
Water Quality Improvement ◽  
The Mean ◽  
Wetland System

In 2007, a 2.8-ha multi-function constructed wetland was successfully built in Pingtung County, Taiwan to improve the water quality of local stream and ecosystem of the surrounding environment. The mean inflow rate was approximately 1,350 m3/day. The major influents of the wetland come from the local drainage ditches and streams mainly containing returned water from upstream farmlands and secondary wastewater from hog farms located in the upper catchment of the wetland. Thus, the influents contain moderate to high concentrations of organics and nutrients. The mean measured hydraulic loading rate, hydraulic retention time, water depth, and total volume of wetland system were 0.1 m/day, 5.5 days, 0.7 m, and 7,800 m3, respectively. In this study, water, sediment, and plant samples were collected and analyzed quarterly for each wetland basin during the two-year investigation period. Results show that more than 77% of total coliforms (TC), 78% of biochemical oxygen demand (BOD), 88% of total nitrogen (TN), and 96% of ammonia nitrogen were removed via the constructed wetland system. Thus, the wetland system has a significant effect on water quality improvement and is able to remove most of the pollutants from the local stream through natural attenuation mechanisms. Except for stream water quality improvement and rehabilitating the natural ecosystem, this wetland also offers more water assessable eco-ponds and eco-gardens for public. This constructed wetland has become one of the most successful multi-function constructed wetlands in Taiwan.

scholarly journals Are the Water Quality Improvement Measures of China’s South-to-North Water Diversion Project Effective? A Case Study of Xuzhou Section in the East Route

2020 ◽  
Vol 17 (17) ◽  
pp. 6388
Author(s):  
Ye Pan ◽  
Yuan Yuan ◽  
Ting Sun ◽  
Yuxin Wang ◽  
Yujing Xie ◽  
...  
Keyword(s):  
Water Quality ◽  
Quality Improvement ◽  
Influencing Factors ◽  
Quality Parameters ◽  
Water Quality Parameters ◽  
Water Diversion ◽  
Quality Data ◽  
Water Quality Improvement ◽  
North Water ◽  
Improvement Measures

Xuzhou is the hub city of the east route of China’s South-to-North Water Diversion (SNWD) project and implemented dozens of measures to ensure the water quality security of the water transmission line. In order to detect the effectiveness of water quality improvement measures, the monthly water quality data of five water quality parameters from 2005 to 2015 of six state-controlled monitoring sites in Xuzhou section were selected for analysis. The results showed that the water quality improved from 2.95 in 2005 to 2.74 in 2015, as assessed by the comprehensive water quality identification index (CWQII), and basically reached the Class III standards of China’s Environmental Quality Standard for Surface Water (GB3838-2002) from 2011 to 2015. The trend analysis showed that the decline of ammonia nitrogen (NH3-N) was the most obvious among the five water quality parameters. However, the concentrations of phosphorus (TP) showed significant upward trends at three sites. The positive abrupt change of time series of water quality occurred in 2009–2011. The identification of influencing factors of water quality changes by multivariate statistical methods found that the urbanization factor accompanied by a decrease in agricultural nonpoint source pollution emissions and the enhancement of wastewater treatment capacity, the closure of factories with substandard emissions and precipitation were the major influencing factors of most water quality parameters, which confirmed the effectiveness of measures for water quality improvement in Xuzhou.

Abnormal pH elevation in the Chaobai River, a reclaimed water intake area

2017 ◽  
Vol 19 (2) ◽  
pp. 111-122 ◽  
Author(s):  
Bao-nan He ◽  
Jiang-tao He ◽  
Jian Wang ◽  
Jie Li ◽  
Fei Wang
Keyword(s):  
Water Quality ◽  
Quality Improvement ◽  
River Water ◽  
Ecosystem Management ◽  
Water Intake ◽  
Theoretical Basis ◽  
Reclaimed Water ◽  
River Ecosystem ◽  
Water Quality Improvement ◽  
Ph Elevation

Understanding the main reasons causing pH elevation in river water has important implications for river ecosystem management and improvement of water quality and can provide a theoretical basis for the direction of water quality improvement.

Aspects of Water Quality Improvement during Aquifer Storage and Recovery

2001 ◽  
Author(s):  
Simon Toze ◽  
Peter Dillon ◽  
Paul Pavelic ◽  
Brenton Nicholson ◽  
Michel Gibert
Keyword(s):  
Water Quality ◽  
Quality Improvement ◽  
Aquifer Storage And Recovery ◽  
Water Quality Improvement ◽  
Aquifer Storage
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