Spatial and Temporal Variations of Water Quality and Trophic Status in Xili Reservoir: a Subtropics Drinking Water Reservoir of Southeast China

1st International Global on Renewable Energy and Development

Yunlong, Song^1 ; Zhang, Jinsong^1 ; Zhu, Jia^2 ; Li, Wang^3 ; Chang, Aimin^3 ; Yi, Tao^4

School of Civil and Environment Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen

518055, China^1

School of Architectural and Environmental Engineering, Shenzhen Polytechnic, Shenzhen

518055, China^2

Shenzhen Water Quality Testing Center, Shenzhen

518055, China^3

Graduate School at Shenzhen, Tsinghua University, Shenzhen

518055, China^4

关键词: Key influencing factors;    Phytoplankton biomass;    Seasonal variation;    Spatial and temporal variation;    Spatial heterogeneity;    Temporal and spatial distribution;    Water quality factor;    Water quality pollution;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/100/1/012183/pdf
DOI  :  10.1088/1755-1315/100/1/012183

来源: IOP

【 摘 要 】

Controlling of water quality pollution and eutrophication of reservoirs has become a very important research topic in urban drinking water field. Xili reservoir is an important water source of drinking water in Shenzhen. And its water quality has played an important role to the city's drinking water security. A fifteen-month's field observation was conducted from April 2013 to June 2014 in Xili reservoir, in order to analyze the temporal and spatial distribution of water quality factors and seasonal variation of trophic states. Xili reservoir was seriously polluted by nitrogen. Judged by TN most of the samples were no better than grade VI. Other water quality factor including WT, SD, pH, DO, COD, TOC, TP, Fe, silicate, turbidity, chlorophyll-A were pretty good. One-way ANOVA showed that significant difference was found in water quality factors on month (p Latter rainy period > High temperature and rain free period > Temperature jump period > Winter drought period. Two-way ANOVA showed that months rather than locations were the key influencing factors of water quality factors succession.TLI (Σ) were about 35∼52, suggesting Xili reservoir was in mycotrophic trophic states. As a result of runoff pollution, water quality at sampling sites 1 and 10 was poor. In the rainy season, near sampling sites 1 and 10, water appeared to be Light-eutrophic. The phytoplankton biomass of Xili reservoir was low. Water temperature was the main driving factor of phytoplankton succession.The 14 water quality factors were divided into five groups by factor analysis. The total interpretation rate was about 70.82%. F1 represents the climatic change represented by water temperature and organic pollution. F2 represents the concentration of nitrogen. F3 represents the phytoplankton biomass. F4 represents the sensory indexes of water body, such as turbidity, transparency.