scholarly journals Trail erosion in the area of the Seven Rila Lakes Cirquе, Rila National Park, Bulgaria

2021 ◽  
Vol 82 (3) ◽  
pp. 256-258
Author(s):  
Radenka Mitova
Keyword(s):  
National Park ◽  
Maximum Depth ◽  
Recovery Processes ◽  
Trail Degradation

The study is of a pilot nature and aims to investigate and document the trail erosion in the Seven Rila Lakes Cirque, Rila National Park, Bulgaria. The width and maximum depth of the trails were measured in 31 randomly selected points on the trail network. The results show that in half of the studied cases there is а trail degradation, but in other cases, recovery processes are observed.

scholarly journals Bathymetric and morphometric surveys of the Montebello Lakes, Chiapas

2016 ◽  
Vol 75 (s1) ◽  
Author(s):  
Javier Alcocer ◽  
Luis A. Oseguera ◽  
Guillermo Sánchez ◽  
Circe G. González ◽  
Joaquín R. Martínez ◽  
...  
Keyword(s):  
Shallow Lakes ◽  
National Park ◽  
Main Axis ◽  
Morphometric Parameters ◽  
Maximum Depth ◽  
Ramsar Convention ◽  
Surface Areas ◽  
Physical Chemical ◽  
Average Maximum ◽  
Karst Lake

This study presents the first bathymetric surveys and descriptions of the morphometric parameters of the major lakes of the national park and Ramsar Convention site <em>Lagunas de Montebello</em>, Chiapas, Mexico and represents the first contribution on these limnologically unknown lakes. The morphology of lacustrine basins has an important influence on the physical, chemical and biological dynamics, and limnological research must consider the bathymetry and the related morphometric parameters of the lakes. Of the more than 50 lakes that make up this karst lake system (including dolines, uvalas and poljes), 18 representative lakes were selected along a NW-SE transect. The lakes have widely varying dimensions and include small and deep, small and shallow, large and deep, and large and shallow lakes. The shapes of the lakes vary from circular to elliptical, and the basin resembles an inverted truncated cone. The orientation of the main axis follows the structural orientations of the karst landscape (i.e., faults, fractures and folds). The maximum lengths range from 0.14 to 3.2 km, the surface areas range from 1.1 ha to 306.6 ha, and the lake volumes range from 0.00004 to 0.08852 km<sup>3</sup>. Six lakes are among the deepest lakes in Mexico and have an average maximum depth of more than 50 m; the deepest lake has a maximum depth of 198 m. These depths favor prolonged stratification, which increases the probability of accumulating pollutants.

scholarly journals Changes in Imja Tsho in the Mount Everest region of Nepal

2014 ◽  
Vol 8 (5) ◽  
pp. 1661-1671 ◽  
Author(s):  
M. A. Somos-Valenzuela ◽  
D. C. McKinney ◽  
D. R. Rounce ◽  
A. C. Byers
Keyword(s):  
Ground Penetrating Radar ◽  
National Park ◽  
Maximum Depth ◽  
Mount Everest ◽  
Bathymetric Survey ◽  
Glacier Terminus ◽  
Ground Penetrating

Abstract. Imja Tsho, located in the Sagarmatha (Everest) National Park of Nepal, is one of the most studied and rapidly growing lakes in the Himalayan range. Compared with previous studies, the results of our sonar bathymetric survey conducted in September of 2012 suggest that its maximum depth has increased from 90.5 to 116.3 ± 5.2 m since 2002, and that its estimated volume has grown from 35.8 ± 0.7 to 61.7 ± 3.7 million m3. Most of the expansion of the lake in recent years has taken place in the glacier terminus–lake interface on the eastern end of the lake, with the glacier receding at about 52 m yr−1 and the lake expanding in area by 0.04 km2 yr−1. A ground penetrating radar survey of the Imja–Lhotse Shar glacier just behind the glacier terminus shows that the ice is over 200 m thick in the center of the glacier. The volume of water that could be released from the lake in the event of a breach in the damming moraine on the western end of the lake has increased to 34.1 ± 1.08 million m3 from the 21 million m3 estimated in 2002.

scholarly journals Changes in Imja Tsho in the Mt. Everest region of Nepal

2014 ◽  
Vol 8 (3) ◽  
pp. 2375-2401 ◽  
Author(s):  
M. A. Somos-Valenzuela ◽  
D. C. McKinney ◽  
D. R. Rounce ◽  
A. C. Byers
Keyword(s):  
Ground Penetrating Radar ◽  
National Park ◽  
Maximum Depth ◽  
Bathymetric Survey ◽  
Glacier Terminus ◽  
Ground Penetrating

Abstract. Imja Tsho, located in the Sagarmatha (Everest) National Park of Nepal, is one of the most studied and rapidly growing lakes in the Himalayan range. Compared with previous studies, the results of our sonar bathymetric survey conducted in September 2012 suggest that the maximum depth has increased from 98 m to 116 ± 0.25 m since 2002, and that its estimated volume has grown from 35.8 ± 0.7 million m3 to 61.6 ± 1.8 million m3. Most of the expansion of the lake in recent years has taken place in the glacier terminus–lake interface on the eastern end of the lake, with the glacier receding at about 52.6 ± 0.3 m yr−1 and the lake expanding in area by 0.039 ± 0.0195 km2 yr−1. A ground penetrating radar survey of the Imja-Lhotse Shar glacier just behind the glacier terminus shows that the ice is over 217 ± 12.71 m thick in the center of the glacier. The volume of water that could be released from the lake in the event of a breach in the damming moraine on the western end of the lake has increased from 21 million m3 in 2002 to 34.8 ± 0.54 million m3 in 2012.

Ultrastructural Localization of Phycocyanin in the Acidophilic, Thermophilic Alga, Cyanidium Caldarium

1973 ◽  
Vol 31 ◽  
pp. 462-463
Author(s):  
M. R. Edwards ◽  
J. D. Mainwaring
Keyword(s):  
Yellowstone National Park ◽  
National Park ◽  
Ultrastructural Localization ◽  
Review Of Literature ◽  
Cyanidium Caldarium ◽  
Taxonomic Rank ◽  
Thin Sections ◽  
Standard Methods ◽  
Laboratory Cultures

Although the general ultrastructure of Cyanidium caldarium, an acidophilic, thermophilic alga of questionable taxonomic rank, has been extensively studied (see review of literature in reference 1), some peculiar ultrastructural features of the chloroplast of this alga have not been noted by other investigators.Cells were collected and prepared for thin sections at the Yellowstone National Park and were also grown in laboratory cultures (45-52°C; pH 2-5). Fixation (glutaraldehyde-osmium), dehydration (ethanol), and embedding (Epon 812) were accomplished by standard methods. Replicas of frozenfracture d- etched cells were obtained in a Balzers apparatus. In addition, cells were examined after disruption in a French Press.

Evaluation of national park soundscapes based on aircraft type

2011 ◽  
Author(s):  
Levi Zitting ◽  
Britton Mace ◽  
Grant Corser
Keyword(s):  
National Park ◽  
Aircraft Type
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