Analysis on Water Quality Change Trend of the Municipal Sewer Network Based on the Mann-Kendall method

Zhenhua, Peng; Zhang, H F; Guo, Yafei; Lang, C; Wang, C Y; Dong, Jianwei; Gao, K; Song, Xi-juan; Yang, YS

doi:10.1088/1755-1315/186/3/012069

Cited by 1 publication

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“…The Mann-Kendal test is a non-parametric test and, according to Peng et al [19], the original hypothesis H0 is the time series data, which are independent, and the alternative hypothesis H1 is a two-sided test. p value > 0.05 indicates no trend, away from monotonic trend.…”

Section: Ecosystemmentioning

confidence: 99%

“…Mann-Kendall test evaluates whether y values tend to increase or decrease over time through what is essentially a nonparametric form of monotonic trend regression analysis [20]. The Mann-Kendall test was applied in studies [1,19,[21][22][23] to detect the trends in water quality time series data. The Mann-Kendall test is applied in this article to support the connectivity evaluation to identify the correlation between water security threats development and the impacts in downstream areas during the last years.…”

Section: Ecosystemmentioning

confidence: 99%

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Operationalizing Water Security Concept in Water Investment Planning: Case Study of São Francisco River Basin

Teixeira

Bhaduri

Bunn

et al. 2021

Water

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Despite advances in water resources management and planning, the São Francisco River Basin in Brazil has suffered from systematic drought problems in recent years, leading to severe human and environmental water security threats. This paper aims to track the water security for different periods and its relations with the changes in physical and natural asset conditions. The paper explores how investment planning to mitigate the water security threats and explore opportunities to increase the value of investments. The paper finds that grey infrastructure has regulated threats from increasing in the downstream of the river basin, however, continuous increase in water security threats in the upstream of the basin threatens water security downstream. This is evident from the spatial connectivity and unidirection externalities. As the capacity to further increase in grey investment is reaching its limit in the downstream, the increases in green infrastructure investment upstream, especially in the Grande River basin, could be one the way to reduce the externalities and minimise the water security risks.

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Section: Ecosystemmentioning

confidence: 99%