scholarly journals Spatiotemporal Changes of Ecosystem Service Value Determined by National Land Space Pattern Change: A Case Study of Fengdu County in The Three Gorges Reservoir Area, China

2021 ◽  
Vol 18 (9) ◽  
pp. 5007
Author(s):  
Haozhe Zhang ◽  
Qingyuan Yang ◽  
Zhongxun Zhang ◽  
Dan Lu ◽  
Huiming Zhang
Keyword(s):  
Urban Space ◽  
Yangtze River ◽  
Three Gorges Reservoir Area ◽  
The Yangtze River ◽  
Spatiotemporal Change ◽  
The Three Gorges ◽  
Change Characteristics ◽  
Space Pattern ◽  
Land Space

Exploring the spatiotemporal change characteristics of ecosystem service value (ESV) under the influence of national land space pattern (NLSP) changes is of great significance for promoting the rational use of land resources and the optimization of ecosystems. In this study, Fengdu County in the Three Gorges Reservoir Area was selected as a case study. We analyzed the changes in NLSP using land use data from 1990, 2000, 2010 and 2018. Then, we used the equivalent factor method and exploratory spatial data analysis method to explore the spatiotemporal change characteristics of the ESV of Fengdu County. The results show that: (1) From 1990 to 2018, the changes in NLSP in Fengdu County generally manifested in the transformation of agricultural space into urban space and ecological space; (2) The spatiotemporal change of ESV is a process that positively responds to the increase in ecological space and negatively responds to the expansion of urban space. From 1990 to 2018, the total ESV of Fengdu County showed a trend of continuous growth, with a total increase of CNY 11.10 × 108, and the change rate was 9.33%. The ESV gain area is mainly located along the Yangtze River and the southernmost part of the county, and the loss area is mainly located near the south bank of the Yangtze River; (3) ESV and its changes in Fengdu County have a significant positive spatial autocorrelation. The cold and hot spots of ESV change are mainly distributed along the Yangtze River and to the south of the Yangtze River. Therefore, it is suggested to integrate ESV as an important indicator into the decision-making of national land space planning. At the same time, it is necessary to strengthen the intensive use of urban space and protect the important ecological space from decreasing. Our study results provide useful insights for the development of regional NLS management and environmental protection policies. However, it is worth noting that the results of this paper are more applicable to areas where the terrain is dominated by mountains.

scholarly journals Simulating landslide-induced tsunamis in the Yangtze River at the Three Gorges in China

2021 ◽  
Author(s):  
Jinge Wang ◽  
Shun Wang ◽  
Aijun Su ◽  
Wei Xiang ◽  
Chengren Xiong ◽  
...  
Keyword(s):  
Yangtze River ◽  
Three Gorges Reservoir ◽  
Early Warning Systems ◽  
Numerical Approach ◽  
Three Gorges Reservoir Area ◽  
Catastrophic Failure ◽  
Three Gorges ◽  
The Yangtze River ◽  
The Three Gorges Reservoir ◽  
The Three Gorges

AbstractLandslide-induced tsunamis may cause fatalities, damages and financial losses. In the Three Gorges Reservoir Area of China, several large landslides are still unstable and persistently creeping toward the Yangtze River. In this paper, we investigate the impacts of landslide-induced tsunamis in the Three Gorges Reservoir by using a hybrid numerical approach. One of the largest unstable mass in this area, the Huangtupo landslide, is chosen as the study object. First, the landslide deformation and initiating velocities are obtained by using the finite-discrete element method. The landslide-induced tsunamis and their impacts on shipping on the Yangtze River are then investigated through smooth particle hydrodynamics modelling. Our results reveal that an approximately 80% reduction in shear strength of the tip in the landslide will lead to catastrophic failure of the landslide, with sliding velocities of up to 8 m/s. Subsequently, such a collapse may initiate a river tsunami, propagating up to 9 m on the nearby reservoir banks within 3 km. The impacts on surrounding floating objects, such as surges and sways, heaves and rolls, are up to 110 m, 8 m and 6°, respectively. The simulations indicate that although the likelihood of a catastrophic failure of the whole landslide is low, the partial sliding still poses severe threat to the nearby reservoir banks and shipping on the Yangtze River. Thus, we recommend continuous monitoring as well as landslide early warning systems at this and also other hazardous sites in this area.

Photocatalytic Degradation Research of p-Xylene Using Doped TiO2 Under Different Conditions

2015 ◽  
Vol 14 (01n02) ◽  
pp. 1460022
Author(s):  
Chen Liu ◽  
Jun-Feng Chen ◽  
Rong-Chang Chen ◽  
Jia-Wei Chen ◽  
Xi Cao
Keyword(s):  
Yangtze River ◽  
Three Gorges Reservoir ◽  
Degradation Rate ◽  
Three Gorges Reservoir Area ◽  
Three Gorges ◽  
The Yangtze River ◽  
Photo Catalyst ◽  
Inland River ◽  
The Three Gorges ◽  
Made In

As the development of the "golden waterway" for the Yangtze River and the formation of the Three Gorges Reservoir area, the inland river shipping of chemical is increasing in China. At the same time, the risk of chemical leak accident is on the rising. Recent years, photo-catalyst has attracted great interest in environmental pollution treating for its unique properties. In order to improve its ability in pollution degradation, different kinds of doped TiO 2 are made in this work. Since the toxicity and transportation quantity, p-Xylene is researched as the aim chemical in this research. The influence of different catalyst, lighting time and reaction temperature to p-Xylene degradation rate are studied respectively in detail.

scholarly journals Identification and Optimization of Production-Living-Ecological Space in an Ecological Foundation Area in the Upper Reaches of the Yangtze River: A Case Study of Jiangjin District of Chongqing, China

Land ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 863
Author(s):  
Hongji Chen ◽  
Qingyuan Yang ◽  
Kangchuan Su ◽  
Haozhe Zhang ◽  
Dan Lu ◽  
...  
Keyword(s):  
Production Function ◽  
Yangtze River ◽  
Ecological Function ◽  
Three Gorges Reservoir Area ◽  
Main Body ◽  
The Yangtze River ◽  
Coordinated Development ◽  
Basic Work ◽  
Main Production

The identification of regional production-living-ecological space (PLES) is the basic work for the optimization of territorial space, which can point to the direction for the protection, utilization and restoration of regional territorial space. Identification and optimization of PLES in an ecological foundation area in the upper reaches of the Yangtze River is of great significance for ensuring national ecological security and promoting sustainable social development. In this study, Jiangjin District, located at the tail of the Three Gorges Reservoir area, was selected as a case study. Moreover, based on the land use data of the study area in 2018, the coordination among production, living and ecological functions are analyzed, and the PLES is identified by using the evaluation method of land production-living-ecological function (PLEF) and the coupling coordination degree model. Then, we formulated an optimized zoning scheme of the PLES according to the principles of ecological priority, area advantage and coordinated development. The results show that (1) The living function and production function presented obvious spatial consistency in the study area, while the spatial distribution of ecological function and production function presented significant spatial complementarity. (2) Four categories of spatial combinations can be identified in the study area. Overall, the study area presented a national spatial pattern with production-living-ecological balanced space (PLEBS) and ecological space (ES) as the main body. (3) The PLES in the study area can be divided into four categories. The ecological function should be determined by the ecological conservation area as the primary responsibility, and the comprehensive improvement zone should further improve the coupling and coordination relationship among the PLEF. Moreover, the main production-living and ecological improvement zone and the main production-ecological and living improvement zone should realize the coordinated development of the PLES on the basis of strengthening the leading function.

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