基于负荷历时曲线法的流域污染负荷特征解析与纳污能力研究——以沙河流域为例

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Abstract The Load Duration Curve (LDC) method was used to investigate the characteristics of pollution load export under different hydrological conditions in Shahe watershed located in Tianjin city, northern China. In addition, the influence of point source and non-point source pollution on water quality and load capacities and reductions for total phosphorus (TP), total nitrogen (TN) and chemical oxygen demand (COD) was also estimated based on LDC. In this study, the water quality target of water pollution prevention and control (surface water environmental quality Ⅲ) and the hydrological and water quality data of Shaheqiao monitoring section from 2006 to 2018 were used for the LDC method. The results showed that the average maximum daily loads of TP, TN and COD in flood season of Shaheqiao section are larger than those in non-flood season, indicating a stronger assimilative capacity. The concentrations of TP and TN in each month exceeded class Ⅲ for surface water quality standard, while the concentrations of COD were within the class Ⅲ standard. Under the objective of class Ⅲ water quality standard, the TP load of shaheqiao section didn't exceed load capacity in low flows, but exceeded the capacity in other flow conditions and the load reductions were 0.086, 0.011, 0.014 and 0.001 t/d, respectively for high flow, medium high flow, medium flow and medium low flow conditions. The TN loads in each flow condition exceeded the load capacities, and the load reduction amounts were 11.811, 4.386, 2.327, 0.466, 0.008t/d, respectively for different flow conditions. The COD load was not required for load reduction since it didn't not exceed the load capacity for all flow conditions. The water quality is mainly affected by point source load when the flow guarantee rate is greater than 75% during the low flow conditions. The pollution loads of Shaheqiao section were within the load capacity for low flow condition, indicating that the influence of point source in Shahe watershed was not significant. Non-point source pollution mainly affects the river water quality during medium and high flow conditions when the flow guarantee rate is less than 75%. For medium and high flow conditions, the current TN and TP loads all exceeded the load capacities and need to be reduced to meet the water quality target, which indicated that nitrogen and phosphorus non-point source pollution has an obvious impact on the water quality of Shahe watershed. This study can provide useful reference for investigating pollution load characteristics based on observed hydrological and water quality data and estimating assimilative capacity of pollutants in different hydrological conditions.

Key words： load duration curve method Shahe watershed water environment capacity estimation

Received: 04 August 2022

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	LIU Xiao-rong
	DU Xin-zhong
	HAN Yu-guo
	LI Ze-li
	LEI Qiu-liang
	LIU Hong-bin

Cite this article:

LIU Xiao-rong,DU Xin-zhong,HAN Yu-guo等. Analysis of pollution load characteristics and assimilative capacity in Shahe watershed based on Load Duration Curve Method[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(3): 1216-1224.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I3/1216

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