scholarly journals EFFECT OF DESIGN PARAMETERS ON ENERGY MITIGATION BY A DEBRIS FLOW BARRIER

2017 ◽  
Author(s):  
MIN-SEOP KIM ◽  
SEUNG-RAE LEE ◽  
NIKHIL NEDUMPALLILE VASU ◽  
JUN-SEO JEON
Keyword(s):  
Debris Flow ◽  
Design Parameters

The clogging and outbreak processes of debris flow with large wood in Jiuzhaigou Valley, China

2020 ◽  
Author(s):  
Xiaoqing Chen ◽  
Jiangang Chen ◽  
Wanyu Zhao
Keyword(s):  
Debris Flow ◽  
Debris Flows ◽  
World Heritage ◽  
Design Parameters ◽  
Amplification Coefficient ◽  
Large Wood ◽  
World Heritage Sites ◽  
Heritage Sites ◽  
Geological Disasters ◽  
Jiuzhaigou Valley

<p>UNESCO designated 1121 properties with outstanding universal value, including 869 cultural sites, 213 natural sites and 39 mixed sites, from 167 states parties as world heritage sites at the end of 2019. Some of them are threatened by geological disasters, especially, the landslides and debris flows become the most frequent hazard type at world heritage sites. Until 2019, China has 55 world heritage sites and ranks first in the world, with 24 places under threat from different types of geological disasters and these disasters directly or indirectly threaten the security of heritage points. The forest coverage rate in Jiuzhaigou valley is more than 80%, and the collapse, rock fall, landslide and other disasters induced by the Jiuzhaigou earthquake on August 8, 2017 have caused extensive forest destruction. We found that there are a lot of large wood (LW) in Jiuzhaigou valley that can be transported. According to previous study results, the process of blocking-outburst in gullies will appear with a large number of LW when transported along with debris flows. Compared with the discharge amplification effect of the debris flow in natural gully, the blocking-outburst effect of LW also intensifies the damage. The process of blockage and outburst with LW movement causes the discharge amplification of debris flow, while the discharge amplification coefficient determines the accuracy of discharge calculation, in further it affects the accuracy of engineering design parameters. Moreover, the LW carried in the debris flow may cause strong impact damage to check dams and other engineering measures. Therefore, we take the debris flow occurred in the Jiuzhaigou valley as an example to investigate the characteristics of the magnitude amplification ratio.</p>

Exploration of design parameters for a dewatering structure for debris flow mitigation

2016 ◽  
Vol 208 ◽  
pp. 81-92 ◽  
Author(s):  
Holly Brunkal ◽  
Paul Santi
Keyword(s):  
Debris Flow ◽  
Design Parameters

Key Problems on Debris Flow Control Engineering after Wenchuan Earthquake in China

2020 ◽  
Author(s):  
Yanchao Gao ◽  
Songjiang Zhao ◽  
Jiazhu Wang ◽  
Wei Xu
Keyword(s):  
Debris Flow ◽  
Wenchuan Earthquake ◽  
Debris Flows ◽  
Large Scale ◽  
Control Measures ◽  
Western China ◽  
Design Parameters ◽  
Disaster Prevention ◽  
Check Dam ◽  
Control Engineering

<p>Strong earthquakes often induce a substantial rise in secondary geohazards. This problem has been studied more after the Great Kanto Earthquake in Japan and the Chichi Earthquake in Taiwan. In western China, after the 2008 M<sub>w</sub>7.9 Wenchuan earthquake, large-scale regional debris flows occurred in 2008, 2009, 2010, 2011, 2013, 2014, and 2019 in the strong earthquake zone. Many control projects have been constructed, including more than 1,000 check dams. Part of the projects were damaged in the subsequent large debris flows. Debris flow after the earthquake is characterized by many loose sources, high frequency and large magnitude. Traditional design parameters and control engineering cannot meet disaster prevention requirements. In the 11 years after the Wenchuan earthquake, our research team continued to investigate the formation of the debris flow in the earthquake area, and summarized the reasons for the failure of the control projects, such as the low estimate of the loose sources and the insufficient design capacity of the check dam. In response to the above problems, we have proposed corresponding solutions, including the optimal combination of different control measures, the design of the dam site and storage capacity, and the structural form of the check dam. This optimization concept has been applied in debris flow prevention such as Qipan gully and Shaofang gully and has achieved good control results. The research provides a reference for subsequent disaster prevention and mitigation in similar earthquake areas.</p>

The influence of confocal microscope design on imaging performance

1993 ◽  
Vol 51 ◽  
pp. 144-145
Author(s):  
C J R Sheppard
Keyword(s):  
Image Quality ◽  
Fluorescence Imaging ◽  
Confocal Microscope ◽  
Industrial Applications ◽  
Three Dimensions ◽  
Design Parameters ◽  
Weak Signals ◽  
Size And Shape ◽  
Imaging Performance ◽  
Fundamental Limitation

The confocal microscope is now widely used in both biomedical and industrial applications for imaging, in three dimensions, objects with appreciable depth. There are now a range of different microscopes on the market, which have adopted a variety of different designs. The aim of this paper is to explore the effects on imaging performance of design parameters including the method of scanning, the type of detector, and the size and shape of the confocal aperture.It is becoming apparent that there is no such thing as an ideal confocal microscope: all systems have limitations and the best compromise depends on what the microscope is used for and how it is used. The most important compromise at present is between image quality and speed of scanning, which is particularly apparent when imaging with very weak signals. If great speed is not of importance, then the fundamental limitation for fluorescence imaging is the detection of sufficient numbers of photons before the fluorochrome bleaches.

Influence of the main design parameters of valve pairs on the efficiency of sucker-rod well pumps operation

2020 ◽  
pp. 7-16
Author(s):  
A.A. Sabirov ◽  
◽  
T.R. Dolov ◽  
V.N. Ivanovskiy ◽  
E.A. Orlova ◽  
...  
Keyword(s):  
Design Parameters ◽  
Main Design ◽  
Sucker Rod

Design Parameters Of A Comfortable Living Environment In The Normative Documentation

2020 ◽  
pp. 51-56
Keyword(s):  
Russian Federation ◽  
Living Environment ◽  
National Standards ◽  
Design Parameters ◽  
Internal Space ◽  
Environment Quality ◽  
Indoor Environment Quality ◽  
Community Information ◽  
Normative Documentation ◽  
The Russian Federation

Currently, the professional construction community information field is largely filled with the topic of creating a comfortable living environment. However, architectural and engineering design that corresponds to the concept of sustainable development is currently hindered due to the lack of a formed conceptual framework that reveals the meaning of the term "comfort", as well as a criteria list that determines the indoor environment quality in the Russian Federation regulatory and technical framework. The article offers some components of a comfortable living environment, within which the parameters of designing the internal environment of premises are highlighted. A comparative analysis of the national standards of the Russian Federation regulating the design of the internal space of residential and public buildings, with international "green" standards for a number of parameters was carried out. It is concluded that it is necessary to update the Russian regulatory and technical base taking into account the international experience of "green" standards.

Effiecency criterion for selection of design parameters of aerospace system

2016 ◽  
Vol 22 (2(99)) ◽  
pp. 48-51
Author(s):  
D.S. Kalynychenko ◽  
◽  
Ye.Yu. Baranov ◽  
M.V. Poluian ◽  
◽  
...  
Keyword(s):  
Design Parameters ◽  
Selection Of

The Development of Structural Design and the Selection of Design Parameters of Aerodynamic Systems for De-orbiting Upper-stage Rocket Launcher

2017 ◽  
Vol 13 (4) ◽  
pp. 29-39 ◽  
Author(s):  
A.P. Alpatov ◽  
◽  
O.S. Palii ◽  
О.D. Skorik ◽  
◽  
...  
Keyword(s):  
Structural Design ◽  
Design Parameters ◽  
Upper Stage ◽  
Selection Of
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