The impact of synoptic circulation and long-term circulation change on air quality and pollution-related human health in the Yangtze River Delta region

2021 ◽  
pp. 135-161
Author(s):  
Zhiheng Liao ◽  
Meng Gao ◽  
Jiaren Sun ◽  
Shaojia Fan
Keyword(s):  
Air Quality ◽  
Yangtze River ◽  
Yangtze River Delta ◽  
The Yangtze River ◽  
Yangtze River Delta Region ◽  
Circulation Change ◽  
The Impact ◽  
Synoptic Circulation ◽  
The Yangtze River Delta

scholarly journals Market Integration and Regional Innovation in China: Evidence from the Yangtze River Delta Region

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Xiaohong Liu ◽  
Ching-Ter Chang
Keyword(s):  
Yangtze River ◽  
Market Integration ◽  
Positive Impact ◽  
Yangtze River Delta ◽  
The Yangtze River ◽  
Delta Region ◽  
Regional Innovation ◽  
Yangtze River Delta Region ◽  
The Impact ◽  
The Yangtze River Delta

Market integration is an important tool for China’s regionally coordinated economic development. At the same time, China is implementing an innovation-driven development strategy. Therefore, the way the market integration affects regional innovation is of great significance to analyze this problem. The panel data of 27 cities in the Yangtze River Delta region in China with the highest degree of economic integration from 2009 to 2018 are used to investigate the impact of market integration (MI) on regional innovation (RI). The main findings are as follows: the first-order lag term of RI is significantly positive, and RI has certain path dependence. In this regard, MI has a positive impact on RI and promotes RI. The estimated coefficient of MI is significantly positive and has a positive impact on RI and promotes RI. This provides a reference for promoting RI through MI. The contributions of the paper are threefold: (1) This paper examines the impact of MI on RI to provide policy implications for the coordinated development of innovation between regions. (2) The relative price method is adopted to measure the MI, which covers 16 kinds of commodities, covering a wider range than does the traditional method. (3) This paper uses the generalized method of moments (GMM) to test the effect of MI on RI for the first time.

Observed long-term differential settlement of metro structures built on soft deposits in the Yangtze River Delta region of China

2020 ◽  
Vol 57 (6) ◽  
pp. 840-850
Author(s):  
Honggui Di ◽  
Shunhua Zhou ◽  
Peijun Guo ◽  
Chao He ◽  
Xiaohui Zhang ◽  
...  
Keyword(s):  
Yangtze River ◽  
Yangtze River Delta ◽  
Differential Settlement ◽  
Bridge Piers ◽  
The Yangtze River ◽  
Yangtze River Delta Region ◽  
Adjacent Structures ◽  
Elevated Structure ◽  
The Yangtze River Delta

In this study, the measured differential settlements of five metro lines built on soft deposits were analyzed. The different structural combinations at various characteristic locations in the metro lines were examined, including at 67 joints of stations and tunnels, 55 connecting passage locations, 4 wind well locations, and at 3 joints of U-shaped grooves and adjacent structures. Moreover, the differential settlement between the track slabs and the bridge piers of a 16.57 km long elevated structure was analyzed. The results showed that the settlements of ∼85% of the stations were less than those of adjacent shield tunnels, and the settlements at the connecting passages of ∼73% of the tunnels were greater than those on either sides of the tunnel. The wind well exhibited lower settlement than its adjacent tunnels. The settlement of the U-shaped groove was greater than that of its adjacent elevated structure, but was less than those of the cut-and-cover and shield tunnels. Approximately 86% of the track slabs exhibited arch deformation, and the settlements of the bridge piers were greater than those of the track slabs. The stiffness transition between the different structures should be considered in the design of metro structures on soft deposits.

scholarly journals The influence of spatiality on shipping emissions, air quality and potential human exposure in the Yangtze River Delta/Shanghai, China

2019 ◽  
Vol 19 (9) ◽  
pp. 6167-6183 ◽  
Author(s):  
Junlan Feng ◽  
Yan Zhang ◽  
Shanshan Li ◽  
Jingbo Mao ◽  
Allison P. Patton ◽  
...  
Keyword(s):  
Air Quality ◽  
Yangtze River ◽  
Human Exposure ◽  
Yangtze River Delta ◽  
River Delta ◽  
The Yangtze River ◽  
Inland Water ◽  
The Yrd ◽  
The Impact ◽  
The Yangtze River Delta

Abstract. The Yangtze River Delta (YRD) and the megacity of Shanghai are host to one of the busiest port clusters in the world; the region also suffers from high levels of air pollution. The goal of this study was to estimate the contributions of shipping to regional emissions, air quality, and population exposure and to characterize the importance of the geographic spatiality of shipping lanes and different types of ship-related sources for the baseline year of 2015, which was prior to the implementation of China's Domestic Emission Control Areas (DECAs) in 2016. The WRF-CMAQ model, which combines the Weather Research and Forecasting model (WRF) and the Community Multi-scale Air Quality (CMAQ) model, was used to simulate the influence of coastal and inland-water shipping, port emissions and ship-related cargo transport on air quality and on the population-weighted concentrations (which is a measure of human exposure). Our results showed that the impact of shipping on air quality in the YRD was primarily attributable to shipping emissions within 12 NM (nautical miles) of shore, but emissions coming from the coastal area between 24 and 96 NM still contributed substantially to ship-related PM2.5 concentrations in the YRD. The overall contribution of ships to the PM2.5 concentration in the YRD could reach 4.62 µg m−3 in summer when monsoon winds transport shipping emissions onshore. In Shanghai city, inland-water going ships were major contributors (40 %–80 %) to the shipping impact on urban air quality. Given the proximity of inland-water ships to the urban populations of Shanghai, the emissions of inland-water ships contributed more to population-weighted concentrations. These research results provide scientific evidence to inform policies for controlling future shipping emissions; in particular, in the YRD region, expanding the boundary of 12 NM from shore in China's current DECA policy to around 100 NM from shore would include most of shipping emissions affecting air pollutant exposure, and stricter fuel standards could be considered for the ships on inland rivers and other waterways close to residential regions.

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