Total phosphorus accident pollution and emergency response study based on geographic information system in Three Gorges Reservoir area

doi:10.1007/s11783-020-1223-3

Front. Environ. Sci. Eng.

2020, Vol. 14

Issue (3) : 46 https://doi.org/10.1007/s11783-020-1223-3

RESEARCH ARTICLE

Total phosphorus accident pollution and emergency response study based on geographic information system in Three Gorges Reservoir area

Aifeng Zhai¹, Xiaowen Ding¹(

), Lin Liu¹, Quan Zhu¹, Guohe Huang^1,²

¹. MOE Key Laboratory of Resources and Environmental System Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, China
². Institute for Energy, Environment and Sustainable Communities, University of Regina, S4S 7H9, Regina, Canada

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Abstract

• A new algorithm of two-dimensional water quantity and the quality model was built.

• The migration and diffusion of TP was simulated.

• The emergency measures for sudden water pollution accidents was proposed.

In recent years, sudden water pollution accidents in China’s rivers have become more frequent, resulting in considerable effects on environmental safety. Therefore, it is necessary to simulate and predict pollution accidents. Simulation and prediction provide strong support for emergency disposal and disaster reduction. This paper describes a new two-dimensional water quantity and the quality model that incorporates a digital elevation model into the geographic information system. The model is used to simulate sudden water pollution accidents in the main stream of the Yangtze River and Jialing River in the Chongqing section of the Three Gorges Reservoir area. The sectional velocity distribution and concentration change of total phosphorus are then analyzed under four hydrological situations. The results show that the proposed model accurately simulates and predicts the concentration change and migration process of total phosphorus under sudden water pollution accidents. The speed of migration and diffusion of pollutants is found to be greatest in the flood season, followed by the water storage period, drawdown season, and dry season, in that order. The selection of an appropriate water scheduling scheme can reduce the peak concentration of river pollutants. This study enables the impact of pollutants on the ecological environment of river water to be alleviated, and provides a scientific basis for the emergency response to sudden water pollution accidents in the Three Gorges Reservoir area.

Keywords Sudden water pollution accident Total phosphorus Predictive model Contaminant simulation Water scheduling Measure

Corresponding Author(s): Xiaowen Ding

Issue Date: 09 March 2020

Cite this article:

Aifeng Zhai,Xiaowen Ding,Lin Liu, et al. Total phosphorus accident pollution and emergency response study based on geographic information system in Three Gorges Reservoir area[J]. Front. Environ. Sci. Eng., 2020, 14(3): 46.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-020-1223-3
https://academic.hep.com.cn/fese/EN/Y2020/V14/I3/46

Parameter	Continuity equation	Momentum equation	Water quality equation
$ϕ$	$Z'$	uv	c
$a p$	$a E + a W + a N + a S$	$(a E + a W + a N + a S + a P 0 − S P Δ x Δ y) / a$
$a E$	$d ‾ e h e Δ y$	$D e A (\| P e \|) + ? − F e, 0 ?$
$a w$	$d ‾ w h w Δ y$	$D w A (\| P w \|) + ? − F w, 0 ?$
$a N$	$d ‾ n h n Δ x$	$D n A (\| P n \|) + ? − F n, 0 ?$
$a S$	$d ‾ s h s Δ x$	$D S A (\| P S \|) + ? F S, 0 ?$
$b$	$u e * h e Δ y + u w * h w Δ y − v n * h n Δ x + v s * h s Δ x$ $+ (h P 0 − h P *) Δ x Δ y / Δ t + q Δ x Δ y$	$S c Δ x Δ y + ϕ P 0 a P 0 + (1 − a) / a a P u P *$
$a p 0$	—	$h p 0 Δ x Δ y / Δ t$
$D e$	—	$(ε x h) e Δ y / Δ x$
$P e$	—	$F e / D e$
$S P$	—	$− g n 2 u 2 + v 2 / h 1 / 3 − q$		$− K H$
$S c$	—	$− g h (Z e − Z w) / Δ x$		$c 0 H$
$u E *$	$((Σ a n b u n b + b) / a P) e + (g h Δ y / a P) e (Z P − Z E)$	-		-
$d ‾ e$	$(Δ y / a P) P (δ x) e / (δ x) e + + (Δ y / a P) E (δ x) e − / (δ x) e$	-		-

Tab.1 The discrete parameter list of equations

Fig.1 The comparison between the predicted TP concentration and the measured TP concentration.

Fig.2 The diagram of the main stream of the Yangtze River and Jialing River in Chongqing section of the Three Gorges Reservoir area.

Fig.3 The velocity simulation of S_HJD section in four hydrological situations.

Fig.4 Migration and diffusion diagram of TP concentration after pollution accident happened in the flood season.

Fig.5 Migration and diffusion diagram of TP concentration after pollution accident happened in the water storage period.

Fig.6 Migration and diffusion diagram of TP concentration after pollution accident happened in the drawdown season.

Fig.7 Migration and diffusion diagram of TP concentration after pollution accident happened in the dry season.

Fig.8 The variation diagram of intake concentration of water source area under three different scheduling schemes.

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