scholarly journals New Insight into the Coupled Grain–Disaster–Economy System Based on a Multilayer Network: An Empirical Study in China

2022 ◽  
Vol 11 (1) ◽  
pp. 59
Author(s):  
Hongjiao Qu ◽  
Junli Li ◽  
Weiyin Wang ◽  
Wenwen Xin ◽  
Cheng Zhou ◽  
...  
Keyword(s):  
Single Layer ◽  
Yangtze River Delta ◽  
River Delta ◽  
Economic Losses ◽  
Spatial Correlations ◽  
Multilayer Network ◽  
Local Conditions ◽  
Level Of Economic Development ◽  
New Perspective ◽  
High Level

Natural disasters occur frequently causing huge economic losses and reduced grain production. Therefore, it is important to thoroughly explore the spatial correlations between grain, disaster, and the economy. Based on inter-provincial panel data in China in 2019, this study integrates complex network and co-occurrence theory into a coupled grain–disaster–economy (GDE) multilayer network, which provides a new perspective to further explore the spatial correlation between these three systems. We identify the spatial coupled characteristics of the GDE multilayer network using three aspects: degree, centrality, and community detection. The research results show the following: (1) Provinces in the major grain-producing regions have a stronger role in allocating and controlling grain resources, and the correlation between grain and disasters in these provinces is stronger and more prone to disasters. Whereas provinces in the Beijing–Tianjin–Hebei economic zone, and the Yangtze River Delta and Pearl River Delta economic zones, such as Beijing, Tianjin, Jiangsu, Shanghai, and Zhejiang, have a high level of economic development, thereby a stronger ability to allocate economic resources. (2) The economic subsystem assumes a more important, central role compared with the grain and disaster subsystems in the formation and development of the coupled GDE multilayer network, with a stronger coordination for the co-development between the complex grain, disaster, and economy systems in the nodal provinces of the network. (3) The community modularity of the coupled GDE multilayer network is significantly higher than that of the three single-layer networks, indicating a more reasonable community division after coupling the three subsystems. The identification of the spatial characteristics of GDE using multilayer network analysis offers a new perspective on taking various measures to improve the joint sustainable development of grain, disaster, and the economy in different regions of China according to local conditions.

Simulation of Downstream Effects of Urbanization on Cloud and Precipitation with WRF Model in Yangtze River Delta, China

2020 ◽  
Author(s):  
Xiaomen Han ◽  
Jianning Sun
Keyword(s):  
Yangtze River ◽  
Vertical Mixing ◽  
Wrf Model ◽  
Single Layer ◽  
Urban Canopy ◽  
Yangtze River Delta ◽  
River Delta ◽  
Dominant Factor ◽  
Urbanization Effect ◽  
Downstream Effects

<p>Urbanization, one of the extreme cases of land-use change, plays an important role in modifying precipitation and urban hydrology. In this study, urbanization effect on cloud and precipitation in the Yangtze River Delta of China is simulated using Weather Research and Forecasting (WRF) model coupled with a single-layer Urban Canopy Model(SLUCM). Based on the 4-summer simulation results from 2011 to 2014, we find that the influence of cities on clouds and precipitation is obviously affected by wind field. During the day, more cloud on higher level and precipitation occurs in urban area and downwind region of urban, induced by more unstable urban air transported downstream, which enhances vertical mixing and updraft moisture transport. At night, the urban dry island become the dominant factor, resulting in the decrease of cloud occurrence in the urban and downstream areas. The downstream effects of urbanization on cloud and precipitation turn out to be strongly related to the moisture and convective conditions.</p><p> </p>

scholarly journals Does the Direct Settlement Policy of Trans-Provincial Outpatient Expenses Aggravate the Siphoning Effect? An Empirical Study on Yangtze River Delta, China

2021 ◽  
Vol 18 (19) ◽  
pp. 10001
Author(s):  
Li Li ◽  
Qingyu Zhou ◽  
Ting Yin ◽  
Zisheng Ji ◽  
Lufa Zhang
Keyword(s):  
Medical Treatment ◽  
Yangtze River ◽  
Yangtze River Delta ◽  
River Delta ◽  
Spatial Accessibility ◽  
Outpatient Visits ◽  
Yangtze River Delta Region ◽  
First Choice ◽  
Regional Medical ◽  
High Level

To solve the problem of reimbursing trans-regional medical expenses, using only cross-regional manual reimbursement but not direct medical insurance card settlement, China implemented a pilot policy of direct settlement of trans-provincial outpatient expenses (DSTOE) in the Yangtze River Delta region. Due to the differences in inter-regional medical development, patients often migrate from areas with low-level medical resources to the high-level areas, a phenomenon that we define as the “siphoning” of trans-regional patients, which can cause a variety of problems. To study whether DSTOE aggravates the siphoning effect, we analyzed the changes in the volume of trans-provincial outpatient visits and conducted a questionnaire survey and factor analysis on the willingness of trans-provincial medical treatment under DSTOE. Results showed that manual reimbursement was gradually replaced by direct settlement, while the total volume was not increased significantly, and the ratio of outpatient visits flowing into and out from Shanghai decreased. The majority of questionnaire respondents confessed that their willingness toward trans-regional medical treatment increased, while their first choice of medical location was still mainly local, with only a few indicating that they would directly choose a cross-regional, higher-level medical institution. Spatial accessibility significantly restricted the seeking of trans-regional medical treatment, whereas age, education level, and policy awareness served as significant protective factors for the choice of medical location. In conclusion, due to space accessibility constraints, insufficient policy coverage, and the rationale for choice of location, DSTOE did not aggravate the siphoning effect of trans-regional patients.

scholarly journals Online Measurement of PM2.5 at an Air Monitoring Supersite in Yangtze River Delta: Temporal Variation and Source Identification

Atmosphere ◽  
2020 ◽  
Vol 11 (8) ◽  
pp. 789 ◽  
Author(s):  
Lian Duan ◽  
Lei Yan ◽  
Guangli Xiu
Keyword(s):  
Yangtze River ◽  
Chemical Species ◽  
Inorganic Ions ◽  
Ambient Air ◽  
Yangtze River Delta ◽  
River Delta ◽  
Water Soluble ◽  
Dianshan Lake ◽  
Haze Pollution ◽  
High Level

To comprehensively explore the transport of air pollutants, one-year continuous online observation of PM2.5 was conducted from 1 April 2015 to 31 March 2016 at Dianshan Lake, a suburban junction at the central of Yangtze River Delta. The chemical species of PM2.5 samples mainly focused on Organic carbon (OC), Elemental carbon (EC) and Water-Soluble Inorganic Ions (WSIIs). The annual average of PM2.5 concentration was 59.8 ± 31.7 µg·m−3, 1.7 times higher than the Chinese National Ambient Air Quality Standards (CNAAQS) (35 µg·m−3). SNA (SO42−, NO3− and NH4+) was the most dominated species of PM2.5 total WSIIs, accounting for 51% of PM2.5. PM2.5 and all of its chemical species shared the same seasonal variations with higher concentration in winter and spring, lower in autumn and summer. The higher NO3−/EC and NOR occurred in winter suggested that intensive secondary formation of nitrate contributed to the higher levels of PM2.5. Cluster analysis based on 72-h backward air trajectory showed that the air mass cluster from nearby inland cities, including Zhejiang, Anhui and Jiangxi Provinces contributed mostly to the total trajectories. Furtherly, potential source contribution function (PSCF) analysis revealed that local sources, namely the emissions in the Yangtze River, were the primary sources. During haze pollution, NO3− was the most important fraction of PM2.5 and the heterogeneous formation of nitrate became conspicuous. All the results suggested that the anthropogenic emissions (such as traffic exhaust) was responsible for the relatively high level of PM2.5 at this monitoring station.

scholarly journals Delta-shaped openness: Visualizing the foreign capital in mainland China

2019 ◽  
Vol 52 (1) ◽  
pp. 3-5
Author(s):  
Ze Zhang ◽  
Tong Cai
Keyword(s):  
Mainland China ◽  
Yangtze River Delta ◽  
River Delta ◽  
The World ◽  
Cooperative Relationship ◽  
The Pearl River ◽  
High Level ◽  
The Yangtze River Delta ◽  
East West

Opening to the world is considered to be an important reason for China's rapid rise in recent decades. Due to China's unique geographical pattern, the eastern coastal areas have always been the window of China's interaction with the world. Although China's east-west openness gap has been widely recognized, mapping the huge gap is valuable in terms of recognizing mainland China. Foreign direct investment (FDI) reflects the long-term cooperative relationship between China and overseas, and FDI is deemed to show a high level of openness to the outside world. Based on the actual utilized amount of FDI capital of the prefecture-level cities in mainland China in 2016, this study developed an equal FDI capital map. The Yangtze River Delta (YRD) and the Pearl River Delta (PRD) are transformed into two much larger deltas, while non-delta-shaped regional units, including Beijing–Tianjin–Hebei (BTH), Fujian, Shandong, and Liaoning are also transformed into deltas of different scales. In addition, the distribution of FDI growth rates indicates that delta-shaped openness is being further strengthened in mainland China.

scholarly journals An Index-Based Assessment of Perceived Climate Risk and Vulnerability for the Urban Cluster in the Yangtze River Delta Region of China

2019 ◽  
Vol 11 (7) ◽  
pp. 2099 ◽  
Author(s):  
Landong Sun ◽  
Zhan Tian ◽  
Huan Zou ◽  
Lanzhu Shao ◽  
Laixiang Sun ◽  
...  
Keyword(s):  
Yangtze River ◽  
Assessment Tool ◽  
Yangtze River Delta ◽  
River Delta ◽  
Climate Risk ◽  
The Yangtze River ◽  
Delta Region ◽  
Yangtze River Delta Region ◽  
High Level ◽  
The Yangtze River Delta

This paper proposes an index-based assessment tool to consolidate diverse opinions of various stakeholders on their assessments of sector-specific risks posed by climate change, and to aggregate these opinions into intuitive and comparable graphs. This tool enables cities to measure and monitor the multiple factors that contribute to their resilience towards climate risk and hazard in the long term. We applied this tool to five key infrastructure sectors in six representative cities in the Yangtze River Delta region. The graphs generated provide for the first time first-hand insights into the aggregative understanding of various stakeholders with regard to the current and future climate risk in their concerned sectors and cities. Our results indicate that a high level of exposure is not automatically associated with a high level of vulnerability across our selected cities. While all cities need to make efforts to reduce their vulnerability towards climate hazards, those characterized by “lower level of exposure but higher level of vulnerability” need to make more urgent and much greater efforts.

On the Structural Features of Scientific and Technological Innovation Network in China’s Urban System: Based on the Analysis of Cooperation Network of High-Level Papers

2016 ◽  
Vol 04 (04) ◽  
pp. 1650033
Author(s):  
Zhongfan JIN ◽  
Guang ZHANG
Keyword(s):  
Urban System ◽  
Structural Features ◽  
Yangtze River Delta ◽  
River Delta ◽  
Practical Significance ◽  
Innovation Network ◽  
Evolutionary Trend ◽  
Urban Agglomerations ◽  
Scientific Papers ◽  
High Level

The cooperation among cities to promote scientific and technological (sci-tech) innovation is of practical significance to regional coordinated development. Therefore, it is necessary to explore the features of sci-tech cooperation and innovation network in China’s urban system. Based on the recognition that high-level scientific papers are important achievements of sci-tech innovation, the author investigates the status quo of the cooperation on high-level scientific papers among cities, establishes a matrix on sci-tech innovation network in China’s urban system and analyzes its structural features and evolutionary trend during 2000–2010. The results show that: urban sci-tech innovation network is developing rapidly, but the development level remains low; network dominant city pairs are distributed across regions; network connection keys, concentrating in the eastern cities, present clear regional differences in distribution; the structure of network dominant cities is relatively stable, but the first network node city (Beijing) is underdeveloped; cohesive subgroups start to develop, but neither the national nor the regional high-level cohesive subgroups are fully developed; the largest subgroup consists of only 25 cities; and none of the three major urban agglomerations (Beijing–Tianjin–Hebei, Yangtze River Delta, and Pearl River Delta urban agglomerations) forms a complete cohesive subgroup.

The Impact of High-Speed Rail on the Spatial Structure of Chinese Urban Agglomerations

2020 ◽  
Vol 46 (3) ◽  
pp. 379-397
Author(s):  
Chunyang Wang
Keyword(s):  
High Speed ◽  
River Delta ◽  
City Size ◽  
High Speed Rail ◽  
Local Conditions ◽  
Urban Agglomerations ◽  
Large Cities ◽  
Spatial Systems ◽  
Economic Concentration ◽  
The Impact

This paper measures the spatial evolution of urban agglomerations to understand be er the impact of high-speed rail (HSR) construction, based on panel data from fi ve major urban agglomerations in China for the period 2004–2015. It is found that there are signi ficant regional diff erences of HSR impacts. The construction of HSR has promoted population and economic diff usion in two advanced urban agglomerations, namely the Yang e River Delta and Pearl River Delta, while promoting population and economic concentration in two relatively less advanced urban agglomerations, e.g. the middle reaches of the Yang e River and Chengdu–Chongqing. In terms of city size, HSR promotes the economic proliferation of large cities and the economic concentration of small and medium-sized cities along its routes. HSR networking has provided a new impetus for restructuring urban spatial systems. Every region should optimize the industrial division with strategic functions of urban agglomeration according to local conditions and accelerate the construction of inter-city intra-regional transport network to maximize the eff ects of high-speed rail across a large regional territory.

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