Modelling Dissolved Oxygen Depression in an Urban River in China

Huang, Jingshui; Yin, Hailong; Chapra, Steven C.; Zhou, Qi

doi:10.3390/w9070520

Cited by 54 publications

(33 citation statements)

References 22 publications

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“…In Figure 9, average DO content of river water in March, May, July, September, and November was 7.99 ± 2.07 mg/L, 5.64 ± 2.79 mg/L,7.90 ± 0.85 mg/L, 6.21 ± 1.66 mg/L, and 3.27 ± 1.41 mg/L, respectively. The saturated oxygen content of water was about 10 mg/L at normal temperature and atmospheric pressure [48,77]. DO content was more than 5 mg/L except the one in November.…”

Section: Redox Condition and Nitrogen Formsmentioning

confidence: 93%

Assessment of Water Quality Using Chemometrics and Multivariate Statistics: A Case Study in Chaobai River Replenished by Reclaimed Water, North China

Song

Zhang

et al. 2020

Water

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Dry rivers could be effectively recovered by reclaimed water in North China, while river water quality would be an important issue. Therefore, it is important to understand the spatiotemporal variation and controlling factors of river water. Water samples were collected during March, May, July, September, and November in the year 2010, then 20 parameters were analyzed. The water environment was oxidizing and alkaline, which was beneficial for nitrification. Nitrate was the main nitrogen form. Depleted and enriched isotopes were found in reclaimed water and river water, respectively. Total nitrogen (TN) and total phosphorus (TP) of reclaimed water exceed the threshold of reclaimed water reuse standard and Class V in the surface water quality criteria. Most river water was at the severe eutrophication level. The sodium adsorption ratio indicated a medium harmful level for irrigation purpose. Significant spatial and temporal variation was explored by cluster analysis. Five months and nine stations were both classified into two distinct clusters. It was found that 6 parameters (chloride: Cl−, sulphate: SO42−, potassium: K+, sodium: Na+, magnesium: Mg2+, and total dissolved solids: TDS) had significant upward temporal variation, and 12 parameters (dissolved oxygen: DO, electric conductivity: EC, bicarbonate: HCO3−, K+, Na+, Ca2+, TDS, nitrite-nitrogen: NO2-N, nitrate nitrogen: NO3-N, TN, TP, and chlorophyll a: Chl.a) and 4 parameters (Mg2+, ammonia nitrogen: NH3-N, and the oxygen-18 and hydron-2 stable isotope: δ18O and δ2H) had a significant downward and upward spatial trend, respectively. The Gibbs plot showed that river water chemistry was mainly controlled by a water–rock interaction. The ionic relationship and principal component analysis showed that river water had undergone the dissolution of carbonate, calcite, and silicate minerals, cation exchange, a process of nitrification, photosynthesis of phytoplankton, and stable isotope enrichment. In addition, gypsum and salt rock have a potential dissolution process.

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Section: Redox Condition and Nitrogen Formsmentioning

confidence: 93%

Assessment of Water Quality Using Chemometrics and Multivariate Statistics: A Case Study in Chaobai River Replenished by Reclaimed Water, North China

Song

Zhang

et al. 2020

Water

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“…Since values lower than 5 mg/L generate an adverse effect on fish and other aquatic organisms, the same applies to them [42,43]. According to Huang et al [44], the dissolved oxygen decrease in urban rivers is rising in developing countries, which causes strong stresses in aquatic ecosystems. This decrease is due to the bacterial decomposition process in the presence of a large number of organic compounds [39,42,45].…”

Section: Discussionmentioning

confidence: 99%

Atoyac River Pollution in the Metropolitan Area of Puebla, México

Castresana

Flores

Reyes

et al. 2018

Water

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Abstract:The Atoyac River crosses the metropolitan area of Puebla-Tlaxcala in Mexico and presents a state of pollution that has been scarcely studied. In 2016, the water quality of the river was evaluated based on physicochemical and bacteriological parameters, under the guidelines established for the Maximum Permissible Limit (MPL) for Aquatic Life Protection (ALP) and Agricultural Irrigation (AI). The sampling sites were the Covadonga Dam, the Echeverría Dam, and an irrigation canal. Water from wells and a spring in the Emilio Portes Gil (EPG) population that uses Atoyac water for agricultural irrigation was also analyzed. The data obtained from the river were compared with the 2011 data published in the declaration of classification of Atoyac and Xochiac or Hueyapan and its tributaries. There was a notable increase in hemical oxygen demand (COD) (49%) and in heavy metals with varying percentages. The anoxic condition of the river (mean 1.47 mg of O 2 /L) with large populations of coliform bacteria was demonstrated, 11 pathogenic members of the Enterobacteriaceae were found, and high organic pollution concentrations were shown, particularly during droughts. Irrigation and well water was contaminated with fecal bacteria (104-549 NMP/100 mL), which included pathogens.

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“…This underlies the selection of DO as the targeted variable in the monitoring design optimization of sampling stations and the number of station in the observed zone. Oxygen solubility is already known as an important water quality variable, which is linked to various biogeochemical cycles, both biotic and abiotic environments (Harris et al, 2015;Huang et al, 2017).…”

Section: Figure 2 Graph Of Principal Component Analysis (A) and Canomentioning

confidence: 99%

Sampling Design for Water Quality Monitoring in Marine Reserve: A Study Case at Banda Sea Conservation Park

Januar

2018

jpsl

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Design of sampling site water quality monitoring at marine reserve is critical, to optimize the effectiveness of periodic assessment. A simple stratified systematic design, that been usually used in most of monitoring analysis, may not maximize the information of spatial data in marine hydrology. The present work applied a multivariate statistical analysis and spatial autocorrelation methods to develop an optimal sampling design for water quality assessment in tropical marine reserve, Banda Sea Conservation Park, Indonesia. Seasonal (west, intermediate, and east monsoon season in Indonesia) and spatial (38 stations) water quality analysis (salinity, dissolved oxygen, pH, and nutrient) in 3 zones of Marine Reserve were conducted. Principal Component Analysis (PCA) showed dissolved oxygen (DO) was the principal variable for the sampling design criterion. Spatial DO Variograms suggested elocation of the sampling stations, to optimize the design of water quality monitoring. Therefore, even the principal variable may vary at other locations, depends on hydrology and other area specific characteristics, the proposed technique could be applied in sampling design concerning water quality monitoring.

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Modelling Dissolved Oxygen Depression in an Urban River in China

Cited by 54 publications

References 22 publications

Assessment of Water Quality Using Chemometrics and Multivariate Statistics: A Case Study in Chaobai River Replenished by Reclaimed Water, North China

Assessment of Water Quality Using Chemometrics and Multivariate Statistics: A Case Study in Chaobai River Replenished by Reclaimed Water, North China

Atoyac River Pollution in the Metropolitan Area of Puebla, México

Sampling Design for Water Quality Monitoring in Marine Reserve: A Study Case at Banda Sea Conservation Park

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