Effect of Urbanization on the River Network Structure in Zhengzhou City, China

Wang, Hongxiang; Huang, Lintong; Hu, J. L.; Yang, Huan; Guo, Wenjuan

doi:10.3390/ijerph19042464

Cited by 15 publications

(10 citation statements)

References 23 publications

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“…The amount of dispersion of an indicator was calculated using the entropy value. When an indicator's information entropy value is low, it means that the distribution is significant and has a large impact on the evaluation as a whole [55]. The formulas are as follows:…”

Section: The Entropy Methodsmentioning

confidence: 99%

“…Although the AHP's operation is rather straightforward, it is arbitrary and subjective [19]. The entropy technique can account for the impact of the indicator's current value on the evaluation outcomes, which is more in accordance with objective reality [55]. In this study, weights were determined using the AHP and entropy methods, and total weighting values were then determined using the weighted average concept.…”

Section: Constructing the Weight Vectormentioning

confidence: 99%

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Assessment of a Multifunctional River Using Fuzzy Comprehensive Evaluation Model in Xiaoqing River, Eastern China

Liu

et al. 2022

IJERPH

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Rivers are beneficial to humans due to their multiple functions. However, human meddling substantially degrades the functions of rivers and constitutes a threat to river health. Therefore, it is vital to assess and maintain river function. This study used the Xiaoqing River in Shandong Province, China, as a case study and established a multilayered multifunctional river evaluation indicator system consisting of environmental function, ecological function, social function, and economic function. The weights of indicators were calculated using the analytic hierarchy process (AHP) and the entropy method. Furthermore, a fuzzy comprehensive evaluation model based on the Cauchy distribution function was developed to assess the operation status of each function in each river segment. The results of the indicator and criterion layers in different river sections varied. The multifunctionality of the river decreased from upstream to downstream. The Jinan section was the most multifunctional, followed by the Binzhou, Zibo, and Dongying sections, and finally the Weifang section. Through additional analysis, this study determined the constraint indicators and functions of each river section. Overall, the results reveal that the idea of a “multifunctional river” can advance the theoretical understanding of a river’s function, and the fuzzy comprehensive evaluation model is demonstrated to provide fresh perspectives for evaluating river function.

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Section: The Entropy Methodsmentioning

confidence: 99%

Section: Constructing the Weight Vectormentioning

confidence: 99%

Assessment of a Multifunctional River Using Fuzzy Comprehensive Evaluation Model in Xiaoqing River, Eastern China

Liu

et al. 2022

IJERPH

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“…These evaluation methods include the problem of incorrect indicator selection, which can lead to inaccurate evaluation results. Nevertheless, this kind of comprehensive and systematic approach to establishing indicators has played a significant role in the assessment of urban rivers that are currently heavily affected by human activities [11]. Overall, river health is primarily based on the construction of indicator systems from four aspects: hydrology, water quality, habitat, and biology [12,13].…”

Section: Introductionmentioning

confidence: 99%

Ecological Health Assessment of an Urban River: The Case Study of Zhengzhou City, China

2023

Self Cite

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Urban river ecological health assessment is an effective means to manage urban rivers, and combining principles of landscape ecology can provide new help for the ecological restoration of urban rivers and improving their ecosystem service value. From the perspective of important functions of ecosystems, based on typical sample site investigations of different river sections, questionnaire surveys, and remote sensing technology, a fuzzy comprehensive evaluation model based on the factor analysis method was used to construct an indicator system that can quantitatively reflect the ecological health of urban rivers. This comprehensive evaluation index system includes five major functions: social function, habitat and corridor function, water ecological function, water landscape function, and spatial enclosure function. The study identified key areas, key rivers, key river sections, and main indicator projects for the ecological restoration of the urban river landscape corridors in Zhengzhou. The study results also showed that the urban river landscape corridors in Zhengzhou have prominent problems in social function, water ecological function, and habitat and corridor function, and 62.1% of the river sections are currently in a sub-healthy state. The flood control function, eutrophication of water body, naturalization rate of revetment, and five other indicators in the old city district are significantly lower than those in the new city district, and the old city district should be the focus of the ecological restoration of urban river corridors. From the evaluation of the ecological health status of typical river sections, the Jinshui River and Xionger River have a larger number of river sections that urgently need restoration. This study provides a reference for the ecological restoration of urban rivers in Zhengzhou, a rapidly urbanizing region, and has reference significance for the construction of water landscapes in small and medium-sized cities with low levels of urbanization.

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“…There have been many studies on the response of the river network system structure to urbanization [10][11][12][13][14] or the effects of land cover change on river morphology and chemical elements [15][16][17]. These studies have been conducted in the past.…”

Section: Introductionmentioning

confidence: 99%

Study on the Evolution and Adaptability of the River Network System under Rapid Urbanization in the Xiangjiang River Basin, China

Yang,

Li,

Feng

et al. 2023

Water

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The research focuses on the difficult problem of quantifying the adaptation state of river network system development under rapid urbanization. Based on the river network system data and remote sensing image data of the past 30 years, this study discusses the evolution of the river network system and its adaptability. The geographically and temporally weighted regression (GTWR) model was used to reveal the response of the river network system in the Xiangjiang River Basin to urbanization. The results suggest that the Xiangjiang River Basin has experienced a significant increase in urban land due to the strong disturbance by human activities in the last 25 years. The number indicators of river network system such as overall water surface rate and river network density have decreased by 10.04% and 13.99%, respectively. Drainage structure indicators such as tributary development coefficient and structural stability decreased by 6.89% and 4.40%, respectively. The influence of three-dimensional urbanization on the intensity of river network density change is spatiotemporal heterogeneity during 1995–2020. It shows that population factors have a significant negative impact on the upstream area. The regression coefficient between river network density and per capita GDP in the basin is positive. The regression coefficient of urban land is negative, indicating that urban expansion has a significant negative effect on river network density in Xiangjiang River basin. The analysis of the relationship between urbanization and river network system evolution by using the coordination degree model shows that: in the early stage, the level of urbanization is low, the adjustment capacity and carrying capacity of river network are strong, and the coordination degree of urbanization and river network system is small. The level of urbanization has reached a new height, especially in the upstream central cities such as Chang-Zhu-Tan from 2015 to 2020. At this time, the increase of coordination degree is characterized by the mutual promotion of urbanization and river network development, and the improvement of their adaptive development requirements. This study quantitatively reveals the changing characteristics and influencing factors of the adaptability of river network systems and urban spatial development, which can provide scientific support for regional human–water harmony, flood prevention and mitigation, and green urbanization development.

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Effect of Urbanization on the River Network Structure in Zhengzhou City, China

Cited by 15 publications

References 23 publications

Assessment of a Multifunctional River Using Fuzzy Comprehensive Evaluation Model in Xiaoqing River, Eastern China

Assessment of a Multifunctional River Using Fuzzy Comprehensive Evaluation Model in Xiaoqing River, Eastern China

Ecological Health Assessment of an Urban River: The Case Study of Zhengzhou City, China

Study on the Evolution and Adaptability of the River Network System under Rapid Urbanization in the Xiangjiang River Basin, China

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