scholarly journals Glacial lake change risk and management on the Chinese Nyainqentanglha in the past 40 years

2016 ◽  
Author(s):  
Wang Shijin
Keyword(s):  
Lake Area ◽  
Glacial Lakes ◽  
Analytic Hierarchy ◽  
Adaptation Capacity ◽  
Comprehensive Method ◽  
Outburst Floods ◽  
Integrated Risk ◽  
Lake Change ◽  
Hierarchy Process ◽  
County Scale

Abstract. The paper analyzed synthetically spatial distribution and evolution status of moraine-dammed lakes in the Nyainqentanglha Mountain, revealed risk degree of county-based potential dangerous glacial lakes (PDGLs) outburst floods disaster by combining PDGLs outburst hazard, regional exposure, vulnerability of exposed elements and adaptation capability and using the Analytic Hierarchy Process and Weighted Comprehensive Method. The results indicate that 132 moraine-dammed lakes (> 0.02 km2) with a total area of 38.235 km2 were detected in the Nyainqentanglha in the 2010s, the lake number decreased only by 5 %, whereas total lake area expanded by 22.72 %, in which 54 lakes with a total area of 17.53 km2 are identified as PDGLs and total area increased by 144.31 %, higher significantly than 4.06 % of non-PDGLs. The zones at very high and high integrated risk of glacial lakes outburst floods (GLOFs) disaster are concentrated in the eastern Nyainqentanglha, whereas low and very low integrated risk zones are located mainly in the western Nyainqentanglha. On the county scale, Nagque and Nyingchi have the lowest hazard risk, Banbar has the highest hazard and vulnerability risk, Sog and Lhorong have the highest exposure risk. In contrast, Biru and Jiali have the highest vulnerability risk, while Gongbo'gyamda and Damxung have lowest adaptation capacity. The regionalization results for GLOF disaster risk in the study are consistent with the distribution of historical disaster sites across the Nyainqentanglha.

scholarly journals Moraine-dammed lake distribution and outburst flood risk in the Chinese Himalaya

2015 ◽  
Vol 61 (225) ◽  
pp. 115-126 ◽  
Author(s):  
Wang Shijin ◽  
Qin Dahe ◽  
Xiao Cunde
Keyword(s):  
Remote Sensing Data ◽  
Disaster Risk ◽  
Eastern Himalaya ◽  
Analytic Hierarchy ◽  
Adaptation Capacity ◽  
Comprehensive Method ◽  
Outburst Floods ◽  
Glacial Lake Outburst Floods ◽  
Hierarchy Process ◽  
County Scale

AbstractTo better understand the risk of disasters due to glacial lake outburst floods (GLOFs), we synthetically analyze the spatial distribution and evolution of moraine-dammed lakes and potentially dangerous glacial lakes (PDGLs) in the Chinese Himalaya. Our county-based assessment of GLOF disaster risk combines PDGL outburst hazard, regional exposure, vulnerability of exposed elements and adaptation capability (risk management) using the analytic hierarchy process. We synthetically analyze the disaster risk using the weighted comprehensive method. Remote-sensing data show there are 329 moraine-dammed lakes (>0.02 km2; total area 125.43 km2) in the Chinese Himalaya, of which 116 (total area 49.49 km2) are identified as PDGLs. The zones at highest risk of GLOF disaster are mainly located in Nyalam, Tingri, Dinggyê, Lhozhag, Kangmar and Zhongba, in the mid-eastern Himalaya. Lowest-risk zones are located in the eastern Himalaya. On the county scale, Lhozhag and Lhunze have the highest hazard degrees and exposure, while Zhongba and Zando have the highest degree of vulnerability and lowest adaptation capacity. Our regionalization results for GLOF disaster risk are consistent with the distribution of historical disaster sites across the Chinese Himalaya.

scholarly journals An Improving the Occupational Risk Assessment in Industrial Enterprises

2021 ◽  
Vol 3 (1) ◽  
pp. 260-267
Author(s):  
Dominika Siwiec ◽  
Artur Woźny ◽  
Andrzej Pacana
Keyword(s):  
Risk Assessment ◽  
Assessment Method ◽  
Occupational Risk ◽  
Analytic Hierarchy ◽  
Industrial Enterprises ◽  
Integrated Risk Assessment ◽  
Risk Assessment Method ◽  
Integrated Risk ◽  
Triangular Number ◽  
Hierarchy Process

Abstract An occupational risk assessment is one of the main processes to assure a safe and healthy workplace. It was shown, that this process is particularly important in the cause of industrial enterprises, in which the number of accidents is the largest. In these enterprises, one of the most often practiced methods is the PN-N-18002 method. However, it was concluded this method has some limitations. They concern the way of assessing the risks in the traditional number scale, which is less precise than the fuzzy triangular number (using in FAHP). Therefore, the aim is to improve the process of assessment in industrial enterprises by integrated the PN-N-18002 method with the FAHP method (Fuzzy Analytic Hierarchy Process). The test of the proposed method was made for three machine operator positions used to aggregate extraction in one of the Podkarpacie enterprises. These positions were: loader operator (Ł-34), digger operator (CAT 323), dredge operator (300/250 KREBS 10/8). The concept of the method was to identify in a precise way what is the greatest extent danger to the operators of these workplaces. It was shown, that it is the work at height. It was concluded, that this method can be practice to risk assessment of other workplaces, among others from industrial enterprises. The originality is the integrated risk assessment method (PN-N-18002) with the fuzzy multicriteria decision method (FAHP) as part of achieving the precise results of risk assessment.

scholarly journals Future glacial lakes in High Mountain Asia: an inventory and assessment of hazard potential from surrounding slopes

2021 ◽  
pp. 1-18
Author(s):  
Wilhelm Furian ◽  
David Loibl ◽  
Christoph Schneider
Keyword(s):  
Mass Movement ◽  
High Mountain ◽  
Lake Area ◽  
Glacial Lakes ◽  
Mountain Areas ◽  
Glacial Retreat ◽  
Proglacial Lakes ◽  
Outburst Floods ◽  
Glacial Lake Outburst Floods ◽  
Triggering Events

Abstract Bedrock overdeepenings exposed by continued glacial retreat can store precipitation and meltwater, potentially leading to the formation of new proglacial lakes. These lakes may pose threats of glacial lake outburst floods (GLOFs) in high mountain areas, particularly if new lakes form in geomorphological setups prone to triggering events such as landslides or moraine collapses. We present the first complete inventory for future glacial lakes in High Mountain Asia by computing the subglacial bedrock for ~100 000 glaciers and estimating overdeepening area, volume and impact hazard for the larger potential lakes. We detect 25 285 overdeepenings larger than 104 m2 with a volume of 99.1 ± 28.6 km3 covering an area of 2683 ± 773.8 km2. For the 2700 overdeepenings larger than 105 m2, we assess the lake predisposition for mass-movement impacts that could trigger a GLOF by estimating the hazard of material detaching from surrounding slopes. Our findings indicate a shift in lake area, volume and GLOF hazard from the southwestern Himalayan region toward the Karakoram. The results of this study can be used for anticipating emerging threats and potentials connected to glacial lakes and as a basis for further studies at suspected GLOF hazard hotspots.

Study on Applicability of Weighted Method for Indexes to Evaluate the Base-System of Water in Naolihe Catchment

2014 ◽  
Vol 1030-1032 ◽  
pp. 609-615
Author(s):  
Zhen Xiang Xing ◽  
Jing Li ◽  
Shu Hua Dong ◽  
Dan Lou ◽  
Qiang Fu ◽  
...  
Keyword(s):  
Analytic Hierarchy Process ◽  
Evaluation Method ◽  
Base System ◽  
Analytic Hierarchy ◽  
Comprehensive Method ◽  
The Analytic Hierarchy Process ◽  
Entropy Weighted ◽  
Hierarchy Process ◽  
Coefficient Method ◽  
Better Than

In order to study the applicability of different weighted methods for indexes to evaluate the health status of basin. The base-system of water theory was introduced, which was used to evaluate the health status of Naolihe catchment. The analytic hierarchy process, entropy weighted method and the variation coefficient method were adopted to calculate the weight of indexes in the base-system of water. The analytic hierarchy process belongs to subjective evaluation method and the other two methods belong to objective evaluation method. Two of the three methods above were joined together, which was called a comprehensive method. In this paper, the three single methods and two comprehensive methods were adopted to calculate indexes’ weights of the base-system of water. The case study results showed that the single analytic hierarchy process was better than the other two single methods and the two comprehensive methods were better than the three single methods. In addition, the comprehensive method 1 (the analytic hierarchy process + entropy weighted method) was better than the comprehensive method 2 (the analytic hierarchy process + the variation coefficient method).

scholarly journals Inventory and classification of the post Little Ice Age glacial lakes in Svalbard

2022 ◽  
Author(s):  
Iwo Wieczorek ◽  
Mateusz Czesław Strzelecki ◽  
Łukasz Stachnik ◽  
Jacob Clement Yde ◽  
Jakub Małecki
Keyword(s):  
Little Ice Age ◽  
High Arctic ◽  
Ice Age ◽  
Aerial Photographs ◽  
Glacial Lake ◽  
High Mountain ◽  
Lake Area ◽  
Glacial Lakes ◽  
Mountain Areas ◽  
Outburst Floods

Abstract. Rapid changes of glacial lakes are among the most visible indicators of global warming in glacierized areas around the world. The general trend is that the area and number of glacial lakes increase significantly in high mountain areas and polar latitudes. However, there is a lack of knowledge about the current state of glacial lakes in the High Arctic. This study aims to address this issue by providing the first glacial lake inventory from Svalbard, with focus on the genesis and evolution of glacial lakes since the end of the Little Ice Age. We use aerial photographs and topographic data from 1936 to 2012 and satellite imagery from 2013 to 2020. The inventory includes the development of 566 glacial lakes (total area of 145.91 km2) that were in direct contact with glaciers in 2008–2012. From the 1990s to the end of the 2000s, the total glacial lake area increased by nearly a factor of six. A decrease in the number of lakes between 2012 and 2020 is related to two main processes: the drainage of 197 lakes and the merger of smaller reservoirs into larger ones. The changes of glacial lakes show how climate change in the High Arctic affect proglacial geomorphology by enhanced formation of glacial lakes, leading to higher risks associated with glacier lake outburst floods in Svalbard.

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