Rayleigh wave group velocity distribution in Ningxia

Li, Hongyi; Liu, Xin; Li, Xinfu; Sheng, Juqin; Cai, Xinhua; Wang, Tongli

doi:10.1007/s12583-011-0162-0

Cited by 21 publications

(10 citation statements)

References 23 publications

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“…Considering the diversity of species and complexity of factors affecting migration resistance, we assign resistance values to different types of land use of the whole study area in two steps. In the first step, we took Yu, K.J and other scholars’ resistance values in similar studies and set the resistance values of water body and construction land to 1 and 500 respectively [41,42,43,44]. Many studies on ecological security patterns suggest that water bodies are the easiest areas and built-up areas are the most difficult areas for species migration.…”

Section: Discussionmentioning

confidence: 99%

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The Construction and Optimization of Ecological Security Pattern in the Harbin-Changchun Urban Agglomeration, China

Guo

Liu

et al. 2019

IJERPH

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Urban agglomerations have become a new geographical unit in China, breaking the administrative fortresses between cities, which means that the population and economic activities between cities will become more intensive in the future. Constructing and optimizing the ecological security pattern of urban agglomerations is important for promoting harmonious social-economic development and ecological protection. Using the Harbin-Changchun urban agglomeration as a case study, we have identified ecological sources based on the evaluation of ecosystem functions. Based on the resistance surface modified by nighttime light (NTL) data, the potential ecological corridors were identified using the least-cost path method, and key ecological corridors were extracted using the gravity model. By combining 15 ecological sources, 119 corridors, 3 buffer zones, and 77 ecological nodes, the ecological security pattern (ESP) was constructed. The main land-use types composed of ecological sources and corridors are forest land, cultivated land, grassland, and water areas. Some ecological sources are occupied by construction, while unused land has the potential for ecological development. The ecological corridors in the central region are distributed circularly and extend to southeast side in the form of tree branches with the Songhua River as the central axis. Finally, this study proposes an optimizing pattern with "four belts, four zones, one axis, nine corridors, ten clusters and multi-centers" to provide decision makers with spatial strategies with respect to the conflicts between urban development and ecological protection during rapid urbanization.

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Section: Discussionmentioning

confidence: 99%

“…Based on the similar research of Yu, K.J. and other scholars, water body and construction land are assigned to minimum and maximum resistance values, which are 1 and 500 respectively [41,42,43,44]. The resistance values of other land types are obtained by normalization result of NPP data.…”

Section: Methodologiesmentioning

confidence: 99%

The Construction and Optimization of Ecological Security Pattern in the Harbin-Changchun Urban Agglomeration, China

Guo

Liu

et al. 2019

IJERPH

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“…The climate in the lake area is mild and dry. The average temperature in July is [15][16][17][18][19][20][21][22][23][24][25] • C, and the average temperature in January is −6 • C. The Lake Issyk-Kul drainage basin occupies a surface area of 22,080 km 2 , and there are 118 large and small rivers with a surface runoff of about 36.7 × 10 8 m 3 [62]. The main river flows are Chong-Koi-Suu, Cholpon-Ata, Chong-Ak-Suu, Ak-Suu, Chong-Uryukty, Pzhergalan, Ak-sai, Tossor, Ton, Dzhuuku, Tamga, Karakol, and Chong-Kyzyl-Su [63].…”

Section: Study Area and Data 21 Study Areamentioning

confidence: 99%

Trend Analysis of Annual and Seasonal River Runoff by Using Innovative Trend Analysis with Significant Test

Alifujiang

Abuduwaili

2021

Water

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This study investigated the temporal patterns of annual and seasonal river runoff data at 13 hydrological stations in the Lake Issyk-Kul basin, Central Asia. The temporal trends were analyzed using the innovative trend analysis (ITA) method with significance testing. The ITA method results were compared with the Mann-Kendall (MK) trend test at a 95% confidence level. The comparison results revealed that the ITA method could effectively identify the trends detected by the MK trend test. Specifically, the MK test found that the time series percentage decreased from 46.15% in the north to 25.64% in the south, while the ITA method revealed a similar rate of decrease, from 39.2% to 29.4%. According to the temporal distribution of the MK test, significantly increasing (decreasing) trends were observed in 5 (0), 6 (2), 4 (3), 8 (0), and 8 (1) time series in annual, spring, summer, autumn, and winter river runoff data. At the same time, the ITA method detected significant trends in 7 (1), 9 (3), 6(3), 9 (3), and 8 (2) time series in the study area. As for the ITA method, the “peak” values of 24 time series (26.97%) exhibited increasing patterns, 25 time series (28.09%) displayed increasing patterns for “low” values, and 40 time series (44.94%) showed increasing patterns for “medium” values. According to the “low”, “medium”, and “peak” values, five time series (33.33%), seven time series (46.67%), and three time series (20%) manifested decreasing trends, respectively. These results detailed the patterns of annual and seasonal river runoff data series by evaluating “low”, “medium”, and “peak” values.

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“…According to recent statistics [32,33], the economic losses caused by global climate change and related extreme climate events have increased by an average of 10 times in the past 40 years. Meteorological disasters have accounted for more than 70% of all natural disasters in China [34].…”

Section: Introductionmentioning

confidence: 99%

Regional Temporal and Spatial Trends in Drought and Flood Disasters in China and Assessment of Economic Losses in Recent Years

et al. 2018

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Understanding the temporal and spatial distribution in disasters plays an important role in disaster risk management. The present study aims to explore the long-term trends in drought and floods over China and estimate the economic losses they cause. A peak-over-threshold approach is used to identify flood peaks, and the relationship between the disasters and climate indices is investigated using Poisson regression. The major results are as follows: (1) the northeastern part of China was severely affected by drought disasters (average damaged area was 6.44 million hectares); (2) the northern part of East China and Central China upstream of the Yangtze River were severely affected by flood disasters (average damaged area was 3.97 million hectares); (3) in the Yangtze River Basin, there are increasing trends in terms of drought and extreme precipitation, especially upstream of the Yangtze River, accompanied by severe disaster losses; and (4) by combining the trends in drought and extreme precipitation days with the spatial distribution of damaged areas, the study indicates that the increasing trend in droughts has shifted gradually from north to south, and the increasing trend in extreme precipitation gradually has shifted from south to north.

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Rayleigh wave group velocity distribution in Ningxia

Cited by 21 publications

References 23 publications

The Construction and Optimization of Ecological Security Pattern in the Harbin-Changchun Urban Agglomeration, China

The Construction and Optimization of Ecological Security Pattern in the Harbin-Changchun Urban Agglomeration, China

Trend Analysis of Annual and Seasonal River Runoff by Using Innovative Trend Analysis with Significant Test

Regional Temporal and Spatial Trends in Drought and Flood Disasters in China and Assessment of Economic Losses in Recent Years

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