scholarly journals A Spatiotemporal Statistical Method of Ship Domain in the Inland Waters Driven by Trajectory Data

2021 ◽  
Vol 9 (4) ◽  
pp. 410
Author(s):  
Fan Zhang ◽  
Xin Peng ◽  
Liang Huang ◽  
Man Zhu ◽  
Yuanqiao Wen ◽  
...  
Keyword(s):  
Statistical Method ◽  
Yangtze River ◽  
Domain Size ◽  
Inland Waters ◽  
The Yangtze River ◽  
Trajectory Data ◽  
Different Types ◽  
Dry Seasons ◽  
Ship Collision ◽  
Shape And Size

In this study, a method for dynamically establishing ship domain in inland waters is proposed to help make decisions about ship collision avoidance. The surrounding waters of the target ship are divided to grids and then calculating the grid densities of ships in each moment to determine the shape and size of ship domain of different types of ships. At last, based on the spatiotemporal statistical method, the characteristics of ship domains of different types of ship in different navigational environments were analyzed. The proposed method is applied to establish ship domains of different types of ship in Wuhan section of the Yangtze River in January, February, July, and August in 2014. The results show that the size of ship domain increases as the ship size increases in each month. The domain size is significantly influenced by the water level, and the ship domain size in dry seasons is larger than in the wet seasons of inland waters.

Freight Distribution Analysis and Modelling of Inland Waterway Transport along the Yangtze River Economic Belt using Big Data

2022 ◽  
pp. 1-36
Author(s):  
Guihua Deng ◽  
Ming Zhong ◽  
Mo Lei ◽  
John Douglas Hunt ◽  
Wanle Wang ◽  
...  
Keyword(s):  
Yangtze River ◽  
Length Distribution ◽  
Water Levels ◽  
Automatic Identification ◽  
Identification System ◽  
Distribution Analysis ◽  
The Yangtze River ◽  
Distribution Models ◽  
Inland Waterway ◽  
Different Types

The Yangtze River Economic Belt (YREB) serves as the main east-west axis of China to promote economic development and environmental protection along the Yangtze River. This paper analyses the factors that affect the freight distribution of major types of cargo transported through the Yangtze River, using data from the automatic identification system (AIS) and ship visa data. First, a set of freight impedance functions are developed for different types of links of the waterway network, by considering a number of factors such as cargo types, delays at ship locks, water levels and flows at different waterway segments and upstream and downstream shipping speeds. Both the distance- and time-based impedance matrices of different types of cargo are computed, respectively. After that, gravity model (GM) and intervening opportunity model (IOM) are estimated to simulate the distribution of different types of cargo based on the computed impedance matrices. Meanwhile, a trip length distribution (TLD) method is applied to validate the estimated distribution models. The results indicate that GM with a power term outperforms other models, and the time-based models are superior to the distance-based ones for the prediction of freight distributions over large geographies like the YREB. This work offers an in-depth understanding of the freight characteristics of inland waterways and therefore it should be helpful for relevant authorities in formulating their port and inland waterway plans and policies.

scholarly journals Study on the Interaction of Urban Land Price and Land Use Efficiency in the Yangtze River Economic Belt, China

2021 ◽  
Author(s):  
Wei He ◽  
Jiao Yang ◽  
ZhongQing Xiong
Keyword(s):  
Land Use ◽  
Yangtze River ◽  
Urban Land ◽  
Urban Land Use ◽  
Panel Var ◽  
The Yangtze River ◽  
Land Price ◽  
Land Use Efficiency ◽  
Different Types ◽  
Use Efficiency

Abstract Taking 110 prefecture level cities in the Yangtze River economic belt from 2008 to 2017 as samples, uses SBM model, coupling coordination model and panel VAR model to study the interaction between urban land price and urban land use efficiency, in order to reveal the interactive influence differences between urban land price and land use efficiency in the region, so as to provide reference for land use management and mitigation in the region Contradiction provides reference. The results are as follows: (1) there is a two-way causal relationship between urban land price and urban land use efficiency in all types of cities, but there are regional differences in the level of significance; (2) the urban land use efficiency and land price in all types of cities have self enhancement mechanism, but they weaken over time; (3) the land price in all types of cities can be increased to a certain extent urban land use efficiency, but the improvement of different types of urban land use efficiency does not necessarily lead to the rise of land price; and (4) different types of urban land use efficiency and the ability of self-inertia enhancement of land price are different, and the mutual influence intensity between land price and land use efficiency is also different. Conclusion: The interaction between land price and land use efficiency is different in different coupling cities. In order to improve the regional land use efficiency and ease the contradiction of land use, we should make different management strategies based on the interaction between them.

scholarly journals Seasonal changes of sediment fluxes in the Yangtze River: roles of precipitation change, human conservation measures in sub-basins, and large dams

2021 ◽  
Author(s):  
Shitian Xu ◽  
Yuanfang Chai ◽  
Yao Yue ◽  
Xia Yan ◽  
Xiaofeng Zhang
Keyword(s):  
Yangtze River ◽  
Flood Control ◽  
Precipitation Change ◽  
Sediment Flux ◽  
The Yangtze River ◽  
Sediment Yields ◽  
Sediment Fluxes ◽  
Conservation Measures ◽  
Dry Seasons ◽  
Sediment Reduction

Abstract Seasonal sediment flux change is a key issue in riverbed evolution and flood control. This paper analyzed variations in sediment fluxes of the Yangtze River in dry and flood seasons during 1961–2014 and the impacts of precipitation change and human interference. Sediment fluxes in both dry and flood seasons decreased by 6.8–74.6 and 14.6–38.7%, respectively, based on daily sediment observations at six mainstream stations. However, precipitation increased sediment yields in both dry and flood seasons by 0.72–4.22 t/km2 (3.5–17.8%) and 4.95–73.32 t/km2 (1.9–25.5%), respectively, based on the reconstructed sediment series without anthropogenic interference. Therefore, sediment reduction due to human conservation measures and dam construction was up to 0.07–20.74 t/km2 (0.9–64.6%) in dry seasons and 27.47–85.35 t/km2 (6.5–23.7%) in flood seasons during 1980–2002, and further reduced 3.61–41.31 t/km2 (46.0–102.9%) in dry seasons and 175.63–471.52 t/km2 (59.6–126.2%) in flood seasons after the Three Gorges Reservoir (TGR) became operational in 2003. Contributions of human activities in six subregions to the reduction of the seaward sediment fluxes were calculated. Thereinto, the TGR only took up 3.2 and 23.9% in dry and flood seasons, respectively, which is below expectation.

scholarly journals A preliminary study on the navigation capacity improvement of the Yangtze River Waterway based on the joint dispatching optimization of the upstream reservoir group

2018 ◽  
Vol 246 ◽  
pp. 02049
Author(s):  
Yingjian Chen ◽  
Qiaoping Fu ◽  
Fangkai Ma
Keyword(s):  
Yangtze River ◽  
The Yangtze River ◽  
Water Transportation ◽  
Upper Yangtze River ◽  
Policy Suggestions ◽  
Freight Volume ◽  
Upstream Reservoir ◽  
Capacity Improvement ◽  
Dry Seasons ◽  
The Upper Yangtze River

The Yangtze River, which has the largest freight volume in the world, is a golden waterway of most importance in China. But there are still some sections with poor navigation standards that impede the potential of the channel from being fully exploited. This paper aims to investigate the possibility of navigation capacity improvement through the joint dispatching optimization of the controlled reservoir group in the upper Yangtze River. The construction and operation situations of the controlled reservoir group are introduced, and the contribution of the current joint dispatching scheme to the Yangtze River Waterway is then analysed. Based on the growing demand for inland water transportation, the possibility of navigation capacity improvement through the joint dispatching optimization is further investigated. The results show that the channel dimension of Yibin-Chongqing and Yichang-Chenglingji section has improved to a certain degree under the current joint dispatching mode, further promotion is possible through the optimization of joint dispatching for those years when the amount of suppliable water during dry seasons is much greater than the shipping demand. Policy suggestions on joint dispatching are finally proposed.

scholarly journals Infrastructure Investment and Regional Economic Growth: Evidence from Yangtze River Economic Zone

Land ◽  
2021 ◽  
Vol 10 (3) ◽  
pp. 320
Author(s):  
Jinrui Zhang ◽  
Ruilian Zhang ◽  
Junzhuo Xu ◽  
Jie Wang ◽  
Guoqing Shi
Keyword(s):  
Economic Growth ◽  
Capital Stock ◽  
Yangtze River ◽  
Regional Economic Growth ◽  
Infrastructure Investment ◽  
The Yangtze River ◽  
Public Infrastructure ◽  
Regional Economic ◽  
Different Types ◽  
Economic Zone

To better understand the impacts of infrastructure investment on economic growth and, we used Cobb-Douglas production function model to develop the stock of public infrastructure capital into the economic growth model. It applies spatial panel data model effect analysis to statistical data of the Yangtze River Economic Zone with 131 cities from 2003 to 2016 and investigates the relationship between different types of public infrastructure capital stock and regional economic growth in different periods. The empirical results show that (1) the economic growth of the cities in the Yangtze River Economic Zone has characteristics of significant spatial dependence, the degree and significance of spatial dependence are gradually declining, and the spatial agglomeration of the economic growth in the cities in the region is relatively stable. (2) Different types of public infrastructure capital stock have distinct spatial effects on regional economic growth. The capital stock of energy infrastructure significantly promotes global economic growth. The capital stock of transportation infrastructure significantly stimulates the local economic growth and inhibits the economic growth of the adjacent areas. The capital stock of water-related infrastructure restrains local economic growth and promotes economic growth in adjacent areas. These findings indicate that increasing investment in public infrastructure development in the Yangtze River Economic Zone remains an effective measure to promote regional economic growth. Under the premise of limited resources, taking full account of the effects of various types of investment can promote the mutual benefit of the economies in the region and effectively achieve the strategic objectives for the Yangtze River Economic Zone.

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