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Search Results (2)

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Keywords = Sequential Impoundment Process

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20 pages, 18655 KB  
Article
Urban River Transformation and the Landscape Garden City Movement in China
by Shuhan Shi, G. Mathias Kondolf and Dihua Li
Sustainability 2018, 10(11), 4103; https://doi.org/10.3390/su10114103 - 8 Nov 2018
Cited by 27 | Viewed by 9393
Abstract
The practice of enhancing existing rivers and creating entirely new waterscapes has exploded in China over the past two decades. In our study of 104 randomly selected cities across China, we identified 14 types of river projects based on grey literature reports and [...] Read more.
The practice of enhancing existing rivers and creating entirely new waterscapes has exploded in China over the past two decades. In our study of 104 randomly selected cities across China, we identified 14 types of river projects based on grey literature reports and their appearance on sequential aerial imagery, falling into three categories: ‘engineering’, ‘waterfront spaces’ and ‘ecological’ projects. ‘Waterfront spaces’ is the most common (60.5%), followed by ‘engineering’ (28.7%) and ‘ecological’ (10.8%). Using multiple stepwise regression, we found that the types of projects undertaken were strongly influenced by factors such as climate, social-economic setting, and ‘Landscape Garden City’ designation. Designation as a ‘Landscape Garden City’ was correlated with ‘waterfront spaces’, but not ‘engineering’ and ‘ecological’ projects. We found that cities in drier climates (as measured by ‘precipitation minus evaporation’) constructed more projects and they included many projects that impounded seasonal rivers to create year-round water bodies. Based on our results, we conclude that Chinese cities are still in the process of ‘decorating’ rivers, and that the ‘Landscape Garden City’ designation promoted such ‘decorating’ projects, especially ‘linear greening’ projects and ‘public spaces along rivers’. The results also demonstrate that the new river projects in China are often at odds with the local climate. Full article
(This article belongs to the Special Issue Human–River Interactions in Cities)
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Article
Non-Linear Analysis of Stress and Strain of Concrete-Faced Rockfill Dam for Sequential Impoundment Process
by He Yu, Shouju Li, Yingxi Liu and Jun Zhang
Math. Comput. Appl. 2010, 15(5), 796-801; https://doi.org/10.3390/mca15050796 - 31 Dec 2010
Cited by 4 | Viewed by 1686
Abstract
The rockfill is modeled as nonlinear elastic material, whose stress-dependent tangent modulus is related to the confining pressure. The parameters of constitutive relationship of stress and strain are determined by tri-dimensional compression test in laboratory. The model applied in this study adopts the [...] Read more.
The rockfill is modeled as nonlinear elastic material, whose stress-dependent tangent modulus is related to the confining pressure. The parameters of constitutive relationship of stress and strain are determined by tri-dimensional compression test in laboratory. The model applied in this study adopts the technique of element birth and death to simulate the sequential impoundment process of concrete-faced rockfill dam with time. Nonlinear finite element method is used to simulate the prototype behavior of various components of the dam in sequential nonlinear analysis and some representative results are presented. Full article
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