Calculation of ecological water requirements of urban rivers using a hydrological model: A case study of Beiyun River

Cheng, Zhang; Wan, Zhongyu; Jing, Zhu; Zhang, Shanghong; Zhao, Yong

doi:10.1016/j.jclepro.2020.121368

Cited by 19 publications

(7 citation statements)

References 16 publications

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“…The annual average rainfall is 642.5 mm, with most rainfall concentrated in June to August. The mainstream of the North Canal has a total length of 260 km, a total area of 6166 km 2 , and an average annual runoff of 572 million m 3 [19]. As the main drainage channel of Beijing, the North Canal flows through densely populated and highly industrialized areas, resulting in 93% of the water source in the upper reaches of the North Canal belonging to wastewater discharged from sewage treatment plants and 4% to untreated wastewater, while the middle and lower reaches of the North Canal are affected by pesticides, fertilizers, and domestic sewage [20].…”

Section: Study Areamentioning

confidence: 99%

Distribution and Ecological Risk Assessment of Pharmaceuticals and Personal Care Products in Sediments of North Canal, China

Pei¹,

Wang³

et al. 2022

Water

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The pollution of water bodies by pharmaceuticals and personal care products (PPCPs) has attracted widespread concern due to their widespread use and pseudo-persistence, but their effects on sediments are less known. In this study, solid-phase extraction-high performance liquid chromatography–tandem mass spectrometry (SPE-LC/MSMS) was used to investigate the occurrence and ecological risks of five typical pharmaceuticals and personal care products (PPCPs) in thirteen key reservoirs, sluices, dams, and estuaries in the Haihe River Basin. At the same time, the PPCP exchanges of surface water, groundwater, and sediments in three typical sections were studied. Finally, the PPCP’s environmental risk is evaluated through the environmental risk quotient. The results showed that the five PPCPs were tri-methoprazine (TMP), sinolamine (SMX), ibuprofen (IBU), triclosan (TCS), and caffeine (CAF). The average concentration of these PPCPs ranged from 0 to 481.19 μg/kg, with relatively high concentrations of TCS and CAF. The relationship between PPCPs in the surface sediments was analyzed to reveal correlations between SMX and TMP, CAF and IBU, CAF and TCS. The risk quotients (RQ) method was used to evaluate the ecological risk of the five detected PPCPs. The major contributors of potential environmental risks were IBU, TCS and CAF, among which all the potential environmental risks at the TCS samples were high risk. This study supplemented the research on the ecological risk of PPCPs in sediments of important reaches of the North Canal to reveal the importance of PPCP control in the North Canal and provided a scientific basis for pollution control and risk prevention of PPCPs.

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Section: Study Areamentioning

confidence: 99%

Distribution and Ecological Risk Assessment of Pharmaceuticals and Personal Care Products in Sediments of North Canal, China

Pei¹,

Wang³

et al. 2022

Water

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“…This denitrification might occur in submerged subsoil due to the rains in September, and in the riparian or hyporheic zone in the tributaries (Yi et al, 2017). In addition, the Beiyun river mainly received effluent from wastewater treatment plants (Zhang et al, 2020a), and the inflow of external sewage masked the signal of biochemical processes. Overall, a majority of the nitrate in Beiyun River originated from manure & sewage especially sewage.…”

Section: Spatiotemporal Variations Of Nitratementioning

confidence: 99%

“…The Beiyun riverine is a complex watershed linked to Beijing, Tianjin, and Hebei Province, characterized by multiple land-use types and incorporated with various economic structures. Nitrate pollution inevitably rose due to the development of urbanization in the watershed and might be harmful to the inhabitants (Zhang et al, 2020a). Although tracing the nitrate source is necessary, the complex watershed factors make the entire process challenging, because most of the water in the Beiyun riverine watershed comes from the WWTPs, and the land-use type and human social activities around the river are complex (Zhang et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Contribution of Nitrogen Sources to Streams in Mixed-use Watershed Varies Seasonally in a Temperate Region

Lin

Liu

Xiao

et al. 2021

Preprint

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The Beiyun river flows through a hot spot region of Beijing-Tianjin-Hebei in China that serves a majority of occupants. However, the region experiences severe nitrate pollution, posing a threat to human health due to inadequate self-purification capacity. In that context, there is an urgent need to assess nitrate levels in this region. Herein, we used δ15N-NO3, δ18O-NO3 isotopes analysis, and stable isotope analysis model to evaluate the nitrate source apportionment in the Beiyun river. A meta-analysis was then used to compare the potential similarity of nitrate sources among the Beiyun riverine watershed and other watersheds. Results of nitrate source apportionment revealed that nitrate originated from the manure & sewage (contribution rate: 89.6%), soil nitrogen (5.9%), and nitrogen fertilizer (3.9%) in the wet season. While in the dry season, nitrate mainly originated from manure & sewage (91.6%). Further, different land-use types exhibited distinct nitrate compositions. Nitrate in urban and suburban areas mostly was traced from manure & sewage (90.5% and 78.8%, respectively). Notably, the different nitrate contribution in the rural-urban fringe and plant-covered areas were manure & sewage (44.3% and 32.8%), soil nitrogen (26.9% and 35.7%), nitrogen fertilizer (23.5% and 29.4%), and atmospheric deposition (5.3% and 2.0%). Through a meta-analysis, we found nitrogen fertilizer, soil nitrogen, and manure & sewage as the main nitrate sources in the Beiyun riverine watershed or the other similar complex watersheds in the temperate. Thus, this study provides a scientific basis for nitrate source apportionment and nitrate preventive management in watersheds with complex land-use types in temperate regions.

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“…Given these shortcomings of hydrological methods, many scholars proposed improvement strategies from three aspects: characteristic flow, calculation period, and percentage coefficient. Examples include using the annual flow of a typical year or monthly average flow instead of multi-year average flow [ 26 ], revising the division of periods based on the seasonal characteristics of the river ecosystem and the activity cycle of the biological population [ 27 ], calibrating the relationship between river flow and ecological health based on actual local conditions [ 28 ], and so on.…”

Section: Introductionmentioning

confidence: 99%

A Practical Approach for Environmental Flow Calculation to Support Ecosystem Management in Wujiang River, China

Dong

Xie

et al. 2022

IJERPH

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To promote ecosystem protection in the Wujiang River, this paper proposes a practical approach for calculating the environmental flow. The proposed approach combines the idea of the “guarantee rate” of the flow duration curve (FDC) method and the grading idea of the Tennant method. A daily flow series of the Wujiang River was compiled from 1956 to 2019 and used to compare the effect of the proposed approach versus the traditional approaches in four selected sections along the river. The results show that the environmental flow of the Wujiang River can be divided into five levels by the T-FDC method, with a level-by-level disparity, and all levels can capture the temporal and spatial variability of river flow. Additionally, the calculated basic environmental flow process ranges between the historical minimum and second minimum monthly average flow, and the threshold width of the optimal flow is more reasonable than the Tennant method. The T-FDC method can provide technical support for Wujiang River ecosystem management and sustainable development.

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Calculation of ecological water requirements of urban rivers using a hydrological model: A case study of Beiyun River

Cited by 19 publications

References 16 publications

Distribution and Ecological Risk Assessment of Pharmaceuticals and Personal Care Products in Sediments of North Canal, China

Distribution and Ecological Risk Assessment of Pharmaceuticals and Personal Care Products in Sediments of North Canal, China

Contribution of Nitrogen Sources to Streams in Mixed-use Watershed Varies Seasonally in a Temperate Region

A Practical Approach for Environmental Flow Calculation to Support Ecosystem Management in Wujiang River, China

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