Protect China’s karst cave habitats

Science ◽  
2021 ◽  
Vol 374 (6568) ◽  
pp. 699-699
Author(s):  
Yi-Fan Duan ◽  
Meng Li ◽  
Ke-Wang Xu ◽  
Liang Zhang ◽  
Li-Bing Zhang
Keyword(s):  
Karst Cave

The Role of Seismic Data in the Exploration and Development of Carbonate Karst Cave Reservoir

2014 ◽  
Author(s):  
Zhenzhong Cai ◽  
Chunduan Zhao ◽  
Xingliang Deng ◽  
Yanming Tong ◽  
Yangyong Pan ◽  
...  
Keyword(s):  
Seismic Data ◽  
Karst Cave ◽  
Exploration And Development

Stability Analysis of Dam Foundation with Karst Cave

2011 ◽  
Vol 90-93 ◽  
pp. 2640-2643
Author(s):  
Wei Ma ◽  
Chong Shi ◽  
Wei Jing Pan
Keyword(s):  
Stability Analysis ◽  
Work Conditions ◽  
Karst Cave ◽  
Dam Foundation ◽  
Safety Coefficient ◽  
Karst Caves ◽  
Load Analysis ◽  
Dip Angle ◽  
The Stability ◽  
Structure Plane

Stability of dam foundation with Karst caves is analyzed in the presented work.Conceptual model is established according to load analysis such as dam gravity and water press. The curve of point safety coefficient on the structure plane is draw out by using stress checking method.With the comparison of curves under different work conditions, it shows that the most dangerous position of Karst cave is at the dam toe area,with the increasing of dip angle of the structure plane,the safety coefficient declines.Then the possible damage zones,mechanism and failure mode of the dam foundation with Karst caves are analyzed. The result can be used in evaluating the stability of dam foundation with Karst cave.

scholarly journals A new representative of the genus Bryocyclops Kiefer, 1927 from a karst cave in north-eastern Thailand (Copepoda, Cyclopoida, Cyclopidae) and comments on the generic affinities

2021 ◽  
Vol 97 (1) ◽  
pp. 97-109
Author(s):  
Santi Watiroyram
Keyword(s):  
New Species ◽  
Posterior Margin ◽  
Present Knowledge ◽  
Knowledge Gap ◽  
Karst Cave ◽  
North Eastern ◽  
Generic Affinity ◽  
Copepoda Cyclopoida

The seventh Thai species of Bryocyclops Kiefer, 1927 – Bryocyclops jayabhumisp. nov. – was found in a karst cave in the Chaiyaphum Province of north-eastern Thailand. The new species differs from all previously-known species by the absence of an inner seta on the proximal endopod of the first four swimming legs. Bryocyclops jayabhumisp. nov. is most similar to B. maholarnensis Watiroyram, Brancelj & Sanoamuang, 2015 – the monotypic species of Group VII, which was previously described from Thailand. However, the new species differs from B. maholarnensis by having the following characteristics: i) posterior margin of urosomites serrated; ii) anal operculum triangular with acute-tip; iii) P1–P4Enp-1 without an inner seta; iv) armature on the female P2–P3Enp-2 and P4Enp; v) a transformed spine on the male P3Enp-2. In this study, the generic affinity of the genus Bryocyclops Kiefer, 1927 is discussed and redefined, based on the available literature concerning its principle morphology to fill the present knowledge gap about the characteristics of the genus.

Effects of Karst Cave Shape on the Stability and Minimum Safety Thickness of Tunnel Surrounding Rock

2021 ◽  
Vol 21 (9) ◽  
pp. 04021150
Author(s):  
L. W. Zhang ◽  
H. Fu ◽  
J. Wu ◽  
X. Y. Zhang ◽  
D. K. Zhao
Keyword(s):  
Surrounding Rock ◽  
Karst Cave ◽  
The Stability ◽  
Safety Thickness

The bearing capacity analysis of limestone strata roof containing a shallow-buried cylinder Karst cave

2021 ◽  
pp. 1-8
Author(s):  
Peng Xie ◽  
Haijia Wen ◽  
Shaokun Ma ◽  
Zurun Yue ◽  
Liangyong Li ◽  
...  
Keyword(s):  
Bearing Capacity ◽  
Capacity Analysis ◽  
Karst Cave

Research of plastic ice, mineral formations and air of multi-frozen karst cave Heetey in Transbaikalia

2020 ◽  
Vol 26 (7) ◽  
pp. 33-43
Author(s):  
I. Zheleznyak ◽  
◽  
S. Tsyrenzhapov ◽  
А. Gurulev ◽  
◽  
...  
Keyword(s):  
Radon Concentration ◽  
Maximum Level ◽  
Natural Environments ◽  
Geochemical Background ◽  
Karst Cave ◽  
Ice Volume ◽  
Internal Cavities ◽  
The Subject ◽  
Microwave Radiometers ◽  
Physical And Chemical

Heetey caves (“cold” and “warm”) which are located in the southern part of the permafrost in the Transbaikal Region have been chosen as the object of the research in the article. The subject is the physical and chemical parameters of the object. The results of the research in the “cold” Heetey cave are given in more detail. The following methods of this object research were chosen: study of the chemical composition of cave air using a chromatograph; radar survey of the cave grotto in the centimeter range; measurement of its own radio-thermal radiation using microwave radiometers. As a result of the research, the following results were obtained. The article provides information on the natural conditions that determine the dependence of the state of natural environments in the Heetey karst caves. The characteristics of occurrence and composition conditions of the natural environments of a karst cave (geological, cryogenic, atmospheric, groundwater) are given, taking into account the cryogenesis of their formation, transformation and influence on the cave air composition. A description of a rare low-temperature mineral, aragonite, which was first discovered in the cave and which is transformed into calcite over time is described. It is shown that the ice cover at the bottom of the cave has a layered structure, which is due to the seasonal ingress of surface water into the cave. The results of measurements of the surface air composition above the rocks’ surface and in caves, namely the content of oxygen, nitrogen, carbon dioxide, explosive gases – methane and hydrogen, mercury vapors are presented. A previously unknown fact of an increased geochemical background of radon concentration has been established. The most probable reasons for the formation and increased background of radon concentration are indicated. Microwave radiometric measurements have shown that there has been warming inside the cave over the past decade. This fact is associated with a general warming of the climate in Transbaikalia, as well as with an increase in the number of visits to caves by unorganized tourists. With the use of a 10 GHz nanosecond radar, hidden internal cavities were discovered in the roof of the cave, which can further lead to its destruction. The prints on the walls of the cave (in its lower part) show that the level of the ice sheet in 2015 is lower than its maximum level (1990) by 10 cm, which corresponds to a loss of ice volume of 12...15 m3 per year

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