Spatial effect of port service coordination of Yangtze River Delta in China based on fuzzy clustering and gravitational model

2021 ◽  
pp. 1-9
Author(s):  
Leng Zhaohua
Keyword(s):  
Fuzzy Clustering ◽  
Yangtze River ◽  
Yangtze River Delta ◽  
River Delta ◽  
Three Dimensions ◽  
Spatial Effects ◽  
Regional Coordination ◽  
Gravitational Model ◽  
Port System ◽  
Service Gap

With the prevalence of international trade protectionism and transformation and upgrading of domestic market structure, the contradiction between demand and competitive development port market of the Yangtze River Delta in China has become increasingly prominent. Nineteen major ports of Yangtze River Delta in China were selected, using the methods of factor analysis, fuzzy clustering, gravitational model, the spatial effects in the hinterland were calculated from three dimensions: central potential, spatial gravity and distribution convenience, and the regional coordination of port services was analyzed. The results show that the potential of Shanghai Port and Ningbo-Zhoushan Port in China is stronger, and the distribution difference is quite obvious. The spatial gravity of each port city superimposes to form an obvious dense semi-circular zone, and the participation ability of the marginal ports is weak. The distribution convenience in hinterland changes from location-dependent to traffic-dependent. The service gap in the hinterland of the port system is more significant, but the expansions of spatial effects make regional coordination gradually improve.

scholarly journals Evolution and container traffic prediction of Yangtze River Delta multi-port system (2001-2017)

2021 ◽  
Vol 13 (1/2) ◽  
pp. 44
Author(s):  
Hongxiang Feng ◽  
Manel Grifoll ◽  
Pengjun Zheng ◽  
Agustí Martin Mallofre ◽  
Frank Murphy ◽  
...  
Keyword(s):  
Yangtze River ◽  
Yangtze River Delta ◽  
River Delta ◽  
Traffic Prediction ◽  
Port System

scholarly journals Current Status and Temporal Trend of Potentially Toxic Elements Pollution in Agricultural Soil in the Yangtze River Delta Region: A Meta-Analysis

2021 ◽  
Vol 18 (3) ◽  
pp. 1033
Author(s):  
Shufeng She ◽  
Bifeng Hu ◽  
Xianglin Zhang ◽  
Shuai Shao ◽  
Yefeng Jiang ◽  
...  
Keyword(s):  
Yangtze River ◽  
Agricultural Soil ◽  
Toxic Elements ◽  
Temporal Trend ◽  
Meta Analysis ◽  
Yangtze River Delta ◽  
Potentially Toxic Elements ◽  
River Delta ◽  
The Yangtze River ◽  
The Yangtze River Delta

Potentially toxic elements (PTEs) pollution in the agricultural soil of China, especially in developed regions such as the Yangtze River Delta (YRD) in eastern China, has received increasing attention. However, there are few studies on the long-term assessment of soil pollution by PTEs over large regions. Therefore, in this study, a meta-analysis was conducted to evaluate the current state and temporal trend of PTEs pollution in the agricultural land of the Yangtze River Delta. Based on a review of 118 studies published between 1993 and 2020, the average concentrations of Cd, Hg, As, Pb, Cr, Cu, Zn, and Ni were found to be 0.25 mg kg−1, 0.14 mg kg−1, 8.14 mg kg−1, 32.32 mg kg−1, 68.84 mg kg−1, 32.58 mg kg−1, 92.35 mg kg−1, and 29.30 mg kg−1, respectively. Among these elements, only Cd and Hg showed significant accumulation compared with their background values. The eastern Yangtze River Delta showed a relatively high ecological risk due to intensive industrial activities. The contents of Cd, Pb, and Zn in soil showed an increasing trend from 1993 to 2000 and then showed a decreasing trend. The results obtained from this study will provide guidance for the prevention and control of soil pollution in the Yangtze River Delta.

scholarly journals The Evolution of the Interactive Relationship between Urbanization and Land-Use Transition: A Case Study of the Yangtze River Delta

Land ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 804
Author(s):  
Bo Niu ◽  
Dazhuan Ge ◽  
Rui Yan ◽  
Yingyi Ma ◽  
Dongqi Sun ◽  
...  
Keyword(s):  
Land Use ◽  
Land Use Change ◽  
Yangtze River ◽  
Yangtze River Delta ◽  
River Delta ◽  
Socioeconomic Factor ◽  
The Yangtze River ◽  
Land Use Transition ◽  
The Yangtze River Delta ◽  
Interaction Relationship

In recent years, the impact of land-use systems on global climate change has become increasingly significant, and land-use change has become a hot issue of concern to academics, both within China and abroad. Urbanization, as an important socioeconomic factor, plays a vital role in promoting land-use transition, which also shows a significant spatial dependence on urbanization. This paper constructs a theoretical framework for the interaction relationship between urbanization and land-use transition, taking the Yangtze River Delta as an example, and measures the level of urbanization from the perspective of population urbanization, economic urbanization and social urbanization, while also evaluating the level of land-use morphologies from the perspective of dominant and recessive morphologies of land-use. We construct a PVAR model and coupled coordination model based on the calculated indexes for empirical analysis. The results show that the relationship between urbanization and land-use transition is not a simple linear relationship, but tends to be complex with the process of urbanization, and reasonable urbanization and land-use morphologies will promote further benign coupling in the system. By analyzing the interaction relationship between urbanization and land-use transition, this study enriches the study of land-use change and provides new pathways for thinking about how to promote high-quality urbanization.

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