Naslov
CAVE EXPLORATIONS AND APPLICATION OF HYDROLOGICAL MODEL IN RAŠPOR CAVE (ISTRIA, CROATIA)

Autori
Rubinić, Andrija ; Kukuljan, Lovel, Glavaš, Ivan, Rubinić, Josip ; Ružić, Igor

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
16th International congress of speleology, Proceedings, volume 2 / Filippi, Michael ; Bosak, Pavel - Brno : Czech Speleological Society and teh SPELEO2013 and in the co-operation with the International Union of Speleology, 2013, 369-374

ISBN
978-80-87857-08-3

Skup
16th International congress of speleology

Mjesto i datum
Brno, Češka Republika, 21.07.2013. - 28.07.2013

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Rašpor Cave; karst hydrology; data mining model

Sažetak
The paper describes explorations conducted in Rašpor Cave (“Jama kod Rašpora”), lying in the immediate vicinity of the village of Rašpor in the north-eastern part of the Istrian Peninsula in Croatia. The cave has during earlier explorations been known under the names of Žankana jama and Abisso Bertarelli. With its depth of 358 m and length of 4996 m, it is the deepest and the longest cave explored in Istria. In over 90 years of exploration, the cave was first made famous by speleologists from Trieste, Italy, in the mid-1920s, when it held the record of being the world’s deepest cave. The explorers of that time had in several large actions reached the then bottom of the cave and had drawn a map, with the bottom according to their measurements lying at 450 m, which was at the time the greatest depth ever reached worldwide. The paper addresses the results of more recent cave explorations carried out during 2008-2012, led by the Speleological Society Spelunka. During that period, many by that time unknown passages were explored and a new map with a 3d model of the cave was prepared. The explored depth of the cave thus extended from the earlier known 1106 m to 4996 m, noting that there was no time to explore and survey many other passages. Since the so called Croatian sump had been a barrier to exploring the cave for a long time, the advantage was taken of very dry hydrological conditions in the year 2011 to go through the cave even without cave diving. On that occasion, data loggers were sited into the passage linked with the said sump, with the purpose of monitoring the water level in the passage and temperature in order to obtain information about oscillations in the level of water in the passage depending on external hydrological conditions – rainfall and air temperatures in the wider impact area. A hydrological model was also prepared using the shell script of the machine learning software Weka, i.e. M5Base classifier (Implements base routines for generating M5 Model trees and rules). Very good results were obtained (with a correlation coefficient of 0, 956), which makes it possible to assess whether passages are passable based on the monitoring of climatological conditions outside the cave, and largely facilitates decision-making about the timing of going down into the cave in order to continue with its exploration through the Croatian sump under dry conditions. The paper shows that when cave explorations are planned, the application of consistent monitoring is very useful, as well as the application of its results in mathematical modelling of hydrological conditions in the underground. This gives not only very valuable information about the characteristics of the functioning of karst aquifers in the underground, but also information based on which speleological activities in a certain period can be planned.

Izvorni jezik
Engleski

Znanstvena područja
Geologija, Građevinarstvo

POVEZANOST RADA