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Water balance investigations in the Bohinj region
Published in A. Kranjc, Tracer Hydrology 97, 2020
Niko Trišič, Marjan Bat, Janez Polajnar, Janko Pristov
Bohinj with its vicinity is an alpine mountainous area between the Sava Dolinka, the Soča and the Bača rivers, located in the central part of Eastern Julian Alps. The highest mountain peak is Triglav (altitude 2863m), in its vicinity is a number of peaks higher than 2500 metres (Razor, Škrlatica, Špik, Prisojnik, Jalovec, Rjavina). South of Triglav range the mountains are of lower altitude, while at Pršivec and Vogar there is a steep drop to the Bohinj lake to the altitude of 500 metres. Bordering to Bohinj depression there is high Komna plateau to the west (altitude 1500 to 1600 m), while to the south there is mountain range of Bohinj ridge (Vogel, Rodica, Črna prst, Kobla). East of Bohinj lake there is the Sava Bohinjka valley cut between karst plateau of Pokljuka and Bohinj ridge. The river is draining the waters of Bohinj area, and some fifteen kilometres downstream at Radovljica it is joining the Sava Dolinka to form the Sava proper. (Fig. 1)
Sinkhole distribution in Winona County, Minnesota revisited
Published in Barry F. Beck, Felicity M. Pearson, Karst Geohazards, 2018
Suzanne Magdalene, E. Calvin Alexander
A set of random sinkhole locations was generated to compare against the observed sinkhole locations in Data Set C. Random number sets were generated that ranged between the minimum and maximum Universal Transverse Mercator (UTM) coordinates for Winona County. The point locations covered a rectangular area. The Prairie du Chien boundary was applied as a cookie cutter to eliminate the parts of the rectangular area where sinkholes are known to not occur. The result was random sinkhole locations on the Prairie du Chien plateau. Random number sets were successively generated until the “cookie-cutter” gave approximately 608 random sinkhole locations. A random number set of n=1250 resulted in 605 random sinkhole locations on the karst plateau. The random sinkhole locations were compared visually and statistically against the observed locations.
Practical examples of applications and interpretations
Published in Werner Käss, Tracing Technique in Geohydrology, 2018
Relative to the drainage of a high alpine karst plateau, these results clearly differ from earlier tests in neighbouring karst massifs. Based on the results of older numerous spore drift tracing tests in the neighbouring Dachstein plateau, as well as in the Toten Mountains farther east (Bauer et al. 1959, Maurin & Zötl 1959, 1964, Zötl 1961), it had been assumed that radial flow would take place in the whole plateau surface and not just in the central part (Fig. 90). These investigation assumptions were based mostly on the older spore drift tracing tests, which were carried out on the one hand with undyed spores, on the other hand, at that time the technical possibilities for sampling and taking spore counts were not as refined as they are today in avoiding and prohibiting contamination.
Efficiency of local minima and GLM techniques in sinkhole extraction from a LiDAR-based terrain model
Published in International Journal of Digital Earth, 2019
Péter Enyedi, Melinda Pap, Zoltán Kovács, László Takács-Szilágyi, Szilárd Szabó
The study area is located in the Jósvafő-plateau and is a good representation of the landscape elements of the Aggtelek Karst, which is a continuous karst territory on the border of Slovakia and Hungary (Figure 1). The Aggtelek Karst lies on the middle and upper Triassic karstifiable bedrock formed by Wetterstein Limestone and Dolomite. The surface has developed through intensive karstification, is rich in sinkholes (see an example in Figure 2) and fragmented by erosional valleys, plateaus and caves. Dolines can be found all over the hilly area between 400 and 600 m a.s.l. The study area is mostly a genuine karst plateau with the typical forms of autogenous karstification. Although the area was a pediment during the Pliocene (as there are lot of dry valleys, which inherited from a previous covered karst period); nowadays, it can be considered as autogenous karst with only a thin soil layer (Telbisz 2011). The sinkholes of the study area were developed by suffusion or solution, collapsed forms are not present. The study area is covered by dense oak hornbeam forests, thermophilus oak forests and scrub woodlands (Bárány-Kevei 2011; Zámbó 1998).
Performance evaluation of the CHIRPS precipitation dataset and its utility in drought monitoring over Yunnan Province, China
Published in Geomatics, Natural Hazards and Risk, 2019
Wenqi Wu, Yungang Li, Xian Luo, Yueyuan Zhang, Xuan Ji, Xue Li
Yunnan Province is located in the plateau region of southwestern China (21°08′–29°15′N, 97°31′–106°11′E; Figure 1). The northwest of Yunnan Province extends to the Qinghai–Tibet Plateau and it borders Myanmar, Laos, and Vietnam to the west and south. The terrain of Yunnan Province can be divided into eastern and western regions, with a karst plateau landscape in the east and high mountains and deep valleys in the west (Li et al. 2015). The plateau region is dissected by the major Nujiang, Lancang, Red, Yangtze, and Pearl Rivers. Affected by both the Indian and East Asian monsoons, the climate is characterized by distinct wet and dry seasons (Li et al. 2015). Annual rainfall is around 1100 mm, approximately 85% of which falls during the wet season (May–October); less than 15% of the annual rainfall is observed during the dry season (November–April). Yunnan Province has frequently been affected by drought disasters throughout history because of its highly variable precipitation. For instance, the large-scale drought disaster that persisted from November 2009 to March 2010 is a recent example (Zhang et al. 2015).
Impoundment-induced nitrogen–phosphorus imbalance in cascade reservoirs alleviated by input of anthropogenic nutrients
Published in Inland Waters, 2018
Dan Yang, Shilu Wang, Weiqi Lu, Peng Xiang, Yuxue Yang, Di Tan, Mingwei Guo, Kevin M. Yeager
The Wujiang River basin (25°56′–30°01′N, 105°09′–109°2′E) is located in the Guizhou karst plateau of southwestern China (Fig. 1). The catchment is about 700 km long, 120 km wide, and runs from southwest to northeast at an elevation of 700–2400 m a.s.l. Permian and Triassic age limestones and dolomites dominate the bedrock. The catchment is characterized by well-developed karst landforms, steep-sloped valleys and gorges, and is sparsely vegetated (mainly with shrubs and limited broadleaf and coniferous forests). A subtropical, monsoon climate prevails, with a mean annual temperature of 14 °C and a mean annual precipitation of 1195 mm in the basin.