Igor Lescesen - Academia.edu (original) (raw)
Papers by Igor Lescesen
Zbornik radova Departmana za geografiju, turizam i hotelijerstvo, 2017
Evaluative function of the final exam provides insight into the educational achievements of stude... more Evaluative function of the final exam provides insight into the educational achievements of students and assessment of the degree of achievement of general and specific standards of achievement. When analyzing the results of students per school year
Journal of the Geographical Institute Jovan Cvijic, SASA
Drought is a natural phenomenon that occurs when the availability of water is significantly below... more Drought is a natural phenomenon that occurs when the availability of water is significantly below the normal levels during a shorter or longer period of time and cannot meet the necessary demand. This study focused on hydrological drought assessment of the Tisza River on four gauging stations: Vásárosnamény, Szolnok, Szeged, and Senta for the period 1964-2018. An effective Streamflow Drought Index (SDI) has been recently proposed and widely used for determining hydrological droughts. Both long-and short-term droughts have very severe impacts on the investigated locations. Two drought periods can be singled out: the first period was from 1983 to 1993, with the exceptions in 1985 and 1987. This period is characterized by higher absolute SDI values on Vásárosnamény (-0.84) and Szolnok (-0.87) than on Szeged (-0.29) and Senta (-0.40) stations. The second period was more severe and lasted from 2011 to 2015, with an average SDI value of-1.32 on Vásárosnamény,-1.08 on Szolnok,-0.53 on Szeged, and-0.57 on Senta station. The Mann-Kendall test results indicate that there is no trend indicating transition from humid towards more arid condition over the investigated period.
Journal of the Geographical Institute Jovan Cvijic, SASA, 2019
Droughts are natural hazards that endanger the safety of population, their property and can creat... more Droughts are natural hazards that endanger the safety of population, their property and can create serious agricultural and ecological problems over the affected region. An analysis of the Standardized Precipitation Index (SPI) was performed by using the database of sixty years (1956-2016) of the monthly precipitation for the nine meteorological stations in Vojvodina region (Serbia). The SPI has been used for drought determination. The present study investigates the application of k-means clustering methods on the SPI at the 12-month timescale values to detect distinct drought clusters. For the purpose of determining the optimal number of clusters, the Gap Statistics was used. The results show that the total of four clusters (regions) can be identified in Vojvodina: three stations are listed in region 1 (Sombor, Palić, and Novi Sad), two stations in region 2 (Bač and Sremska Mitrovica), region 3 is a single-station region (Bela Crkva), while in region 4, three stations are grouped (Kikinda, Zrenjanin, and Vršac). The Mann-Kendall test has shown that only in region 1 there is a trend in SPI values ranging from arid towards more humid conditions in the 1956-2016 period. In other regions no trend was observed in the data series. These results could contribute to water resources and agricultural planning and management in Vojvodina region and also confirm the usefulness of clustering methods for drought regionalization.
Geographica Pannonica, 2016
Spatial and temporal analysis of hydrological droughts, defined by two variables: deficit and dur... more Spatial and temporal analysis of hydrological droughts, defined by two variables: deficit and duration of drought, is presented in this paper. Time series of deficits and drought durations are derived using threshold level method for 15 hydrological stations in basin of Južna Morava (Serbia). Since Q90 was used as threshold level for drought definition, these time series are ready for frequency analysis of extreme droughts. The longest average duration of drought is observed on Visočica River at Braćevci, then on Vlasina River at Vlasotince, and shortest droughts on upstream stations of Južna Morava, Vladičin Han and Grdelica. There is a direct relationship between absolute values of drought deficits and catchment area or mean annual water discharge, while standardize deficits have similar spatial distribution as drought duration. Regional deficit index (RDI) was calculated, which enabled insight in spatial-temporal drought characteristics in defined regions, like seasons when droughts most often occur, and derivation of largest droughts, both in terms of their duration, and covered area.
Geographica Pannonica, 2013
Geographica Pannonica, 2013
the ecosystem , impact of a geographic area and temporal duration of an impact (Dalmacija, 2004).... more the ecosystem , impact of a geographic area and temporal duration of an impact (Dalmacija, 2004). Surface water quality is governed by complex anthropogenic activities and natural factors (Bhaduri et al., 2001; Ren et al., 2003; Xian et al., 2007), and it depends on several main effects: basin lithology, atmospheric impacts, climate conditions and anthropogenic effects (Shrestha, Kazama, 2007). Temperature is one of the factors that may affect the water quality. The increase of water temperature results with the increased biological activity and reduced dissolved oxygen concentration (Sa´nchez, 2007). Due to this, the water quality is usually poorer during the warmer period of the year, namely during spring and summer compared to autumn and winter. Many researchers have confirmed such a trend
Geographica Pannonica, 2012
Geographica Pannonica, 2014
The WQI method is most frequently used in expert and scientific research and basically it provide... more The WQI method is most frequently used in expert and scientific research and basically it provides a mechanism for cumulative representation, numeric expression and defining a certain level of water quality. This paper aims to assess water quality of the Tisa River in Vojvodina (North Serbia) for the 2003-2012 period. Serbian Water Quality Index (SWQI) was used for assessment of the river water quality. WQI is expressed as a single value ranging from 0 to 100 (best quality) derived from numerous physical, chemical, biological and microbiological parameters. The results of SWQI for the Tisa River were mainly rated as good. Also, in this study it is noticed a clear decrease in water quality during warmer period of the year. Also, this study shows that water quality along the Tisa River decreases slightly but steadily downstream, from Martonoš to Titel station and all along the length of the river provides values that according to SWQI descriptive quality indicator has been defined as good (72-83). The main problem of SWQI used in this paper is that it does not involve parameters of heavy metals concentration.
Thermal Science, 2015
The rivers Danube, Sava and Tisa belong to the Black Sea river basin and they flow through many E... more The rivers Danube, Sava and Tisa belong to the Black Sea river basin and they flow through many European countries, while in Serbia they flow through the Pannonian flatland. The water quality of these rivers, which is affected by complex anthropogenic activities and natural factors, is one of important factors that are taken into account in the evaluation of development sustainability of this region. Using the correlation analysis in this paper we tested the impact of air temperature as a natural factor on certain parameters indicating the water quality. A significant correlation was found between air temperature and total nitrogen oxides in the Danube of up to-0.744, namely of-0.740 on the Tisa, and-0.299 on the Sava. A significant correlation was found in electrical conductivity-up to-0.793 on the Danube,-0.226 on the Tisa, and 0.380 on the Sava. Correlation links were found between air temperature and oxygen, Biochemical oxygen demand, as well as suspended matters saturation percentage, but their correlation values are significantly lower. Based on the results of the research it was concluded that air temperature had low effect on changes in water quality during the year and that anthropogenic impact was far more dominant.
Journal of the Geographical Institute Jovan Cvijic, SASA, 2021
The main aim of the research was to determine teachers? opinion on the importance of teaching equ... more The main aim of the research was to determine teachers? opinion on the importance of teaching equipment in geography classroom. The research was conducted during the school year 2020/2021. A total of 134 geography teachers from different districts in Serbia took part in the survey. In general, 57.5% of the participants stated that their school buildings have a specialized and separate geography classroom, while in other schools a classroom is shared between related subjects. It is interesting that 84.3% of the participants stated that in their classrooms they have internet at their disposal. Further, it was concluded that there is no statistically significant correlation between the availability of internet connection and the location of school (rural and urban). On the other hand, one of the biggest problems that 38.8% of the participants highlighted is that maps, which are essential for geography teaching, are approximately 20 years old. On average, the best grade for equipment is...
Polish Journal of Environmental Studies, 2015
Rational and preservation utilization of water resources represents one of the main problems of t... more Rational and preservation utilization of water resources represents one of the main problems of the 21 st century. Water as a resource is a valued quantity, quality, and by location, where the quality is a condition of the water system, expressed through physical-chemical, chemical, and biological indicators. The important aspects taken into consideration when examining the top-priority problems of water quality are economic influence, the influence on human health, influence on the ecosystem, and influence of the geographic area, as well as duration of the influence [1]. Changes in the physico-chemical characteristics of water quality are influenced not only by anthropogenic factors, but also by combined interactive natural processes such as hydrological conditions, topography and lithology, climate, precipitation inputs, catchment area, tectonic and edaphic factors, erosion, weathering of crustal materials and bedrock geology, in combination with environmental influence [2]. It should be also taken into account that the Republic of Serbia is striving toward membership within the EU, and reaching good water quality represents an important challenge [3]. The most important legal framework within the European Union (EU), which regulates water policies, is the Water Framework Directive (WFD) [4]. River systems play an important role in the sustainable development of the whole environment, especially when
Assessment of water quality of the Tisa river (Vojvodina, North Serbia) for ten year period using... more Assessment of water quality of the Tisa river (Vojvodina, North Serbia) for ten year period using Serbian Water Quality Index (SWQI) A Association of young researches "Branislav Bukurov" Faculty
Rational and preservation utilization of water resources represents one of the main problems of t... more Rational and preservation utilization of water resources represents one of the main problems of the 21 st century. Water as a resource is a valued quantity, quality, and by location, where the quality is a condition of the water system, expressed through physical-chemical, chemical, and biological indicators. The important aspects taken into consideration when examining the top-priority problems of water quality are economic influence, the influence on human health, influence on the ecosystem, and influence of the geographic area, as well as duration of the influence . Changes in the physico-chemical characteristics of water quality are influenced not only by anthropogenic factors, but also by combined interactive natural processes such as hydrological conditions, topography and lithology, climate, precipitation inputs, catchment area, tectonic and edaphic factors, erosion, weathering of crustal materials and bedrock geology, in combination with environmental influence . It should be also taken into account that the Republic of Serbia is striving toward membership within the EU, and reaching good water quality represents an important challenge . The most important legal framework within the European Union (EU), which regulates water policies, is the Water Framework Directive (WFD) [4].
Zbornik radova Departmana za geografiju, turizam i hotelijerstvo, 2017
Evaluative function of the final exam provides insight into the educational achievements of stude... more Evaluative function of the final exam provides insight into the educational achievements of students and assessment of the degree of achievement of general and specific standards of achievement. When analyzing the results of students per school year
Journal of the Geographical Institute Jovan Cvijic, SASA
Drought is a natural phenomenon that occurs when the availability of water is significantly below... more Drought is a natural phenomenon that occurs when the availability of water is significantly below the normal levels during a shorter or longer period of time and cannot meet the necessary demand. This study focused on hydrological drought assessment of the Tisza River on four gauging stations: Vásárosnamény, Szolnok, Szeged, and Senta for the period 1964-2018. An effective Streamflow Drought Index (SDI) has been recently proposed and widely used for determining hydrological droughts. Both long-and short-term droughts have very severe impacts on the investigated locations. Two drought periods can be singled out: the first period was from 1983 to 1993, with the exceptions in 1985 and 1987. This period is characterized by higher absolute SDI values on Vásárosnamény (-0.84) and Szolnok (-0.87) than on Szeged (-0.29) and Senta (-0.40) stations. The second period was more severe and lasted from 2011 to 2015, with an average SDI value of-1.32 on Vásárosnamény,-1.08 on Szolnok,-0.53 on Szeged, and-0.57 on Senta station. The Mann-Kendall test results indicate that there is no trend indicating transition from humid towards more arid condition over the investigated period.
Journal of the Geographical Institute Jovan Cvijic, SASA, 2019
Droughts are natural hazards that endanger the safety of population, their property and can creat... more Droughts are natural hazards that endanger the safety of population, their property and can create serious agricultural and ecological problems over the affected region. An analysis of the Standardized Precipitation Index (SPI) was performed by using the database of sixty years (1956-2016) of the monthly precipitation for the nine meteorological stations in Vojvodina region (Serbia). The SPI has been used for drought determination. The present study investigates the application of k-means clustering methods on the SPI at the 12-month timescale values to detect distinct drought clusters. For the purpose of determining the optimal number of clusters, the Gap Statistics was used. The results show that the total of four clusters (regions) can be identified in Vojvodina: three stations are listed in region 1 (Sombor, Palić, and Novi Sad), two stations in region 2 (Bač and Sremska Mitrovica), region 3 is a single-station region (Bela Crkva), while in region 4, three stations are grouped (Kikinda, Zrenjanin, and Vršac). The Mann-Kendall test has shown that only in region 1 there is a trend in SPI values ranging from arid towards more humid conditions in the 1956-2016 period. In other regions no trend was observed in the data series. These results could contribute to water resources and agricultural planning and management in Vojvodina region and also confirm the usefulness of clustering methods for drought regionalization.
Geographica Pannonica, 2016
Spatial and temporal analysis of hydrological droughts, defined by two variables: deficit and dur... more Spatial and temporal analysis of hydrological droughts, defined by two variables: deficit and duration of drought, is presented in this paper. Time series of deficits and drought durations are derived using threshold level method for 15 hydrological stations in basin of Južna Morava (Serbia). Since Q90 was used as threshold level for drought definition, these time series are ready for frequency analysis of extreme droughts. The longest average duration of drought is observed on Visočica River at Braćevci, then on Vlasina River at Vlasotince, and shortest droughts on upstream stations of Južna Morava, Vladičin Han and Grdelica. There is a direct relationship between absolute values of drought deficits and catchment area or mean annual water discharge, while standardize deficits have similar spatial distribution as drought duration. Regional deficit index (RDI) was calculated, which enabled insight in spatial-temporal drought characteristics in defined regions, like seasons when droughts most often occur, and derivation of largest droughts, both in terms of their duration, and covered area.
Geographica Pannonica, 2013
Geographica Pannonica, 2013
the ecosystem , impact of a geographic area and temporal duration of an impact (Dalmacija, 2004).... more the ecosystem , impact of a geographic area and temporal duration of an impact (Dalmacija, 2004). Surface water quality is governed by complex anthropogenic activities and natural factors (Bhaduri et al., 2001; Ren et al., 2003; Xian et al., 2007), and it depends on several main effects: basin lithology, atmospheric impacts, climate conditions and anthropogenic effects (Shrestha, Kazama, 2007). Temperature is one of the factors that may affect the water quality. The increase of water temperature results with the increased biological activity and reduced dissolved oxygen concentration (Sa´nchez, 2007). Due to this, the water quality is usually poorer during the warmer period of the year, namely during spring and summer compared to autumn and winter. Many researchers have confirmed such a trend
Geographica Pannonica, 2012
Geographica Pannonica, 2014
The WQI method is most frequently used in expert and scientific research and basically it provide... more The WQI method is most frequently used in expert and scientific research and basically it provides a mechanism for cumulative representation, numeric expression and defining a certain level of water quality. This paper aims to assess water quality of the Tisa River in Vojvodina (North Serbia) for the 2003-2012 period. Serbian Water Quality Index (SWQI) was used for assessment of the river water quality. WQI is expressed as a single value ranging from 0 to 100 (best quality) derived from numerous physical, chemical, biological and microbiological parameters. The results of SWQI for the Tisa River were mainly rated as good. Also, in this study it is noticed a clear decrease in water quality during warmer period of the year. Also, this study shows that water quality along the Tisa River decreases slightly but steadily downstream, from Martonoš to Titel station and all along the length of the river provides values that according to SWQI descriptive quality indicator has been defined as good (72-83). The main problem of SWQI used in this paper is that it does not involve parameters of heavy metals concentration.
Thermal Science, 2015
The rivers Danube, Sava and Tisa belong to the Black Sea river basin and they flow through many E... more The rivers Danube, Sava and Tisa belong to the Black Sea river basin and they flow through many European countries, while in Serbia they flow through the Pannonian flatland. The water quality of these rivers, which is affected by complex anthropogenic activities and natural factors, is one of important factors that are taken into account in the evaluation of development sustainability of this region. Using the correlation analysis in this paper we tested the impact of air temperature as a natural factor on certain parameters indicating the water quality. A significant correlation was found between air temperature and total nitrogen oxides in the Danube of up to-0.744, namely of-0.740 on the Tisa, and-0.299 on the Sava. A significant correlation was found in electrical conductivity-up to-0.793 on the Danube,-0.226 on the Tisa, and 0.380 on the Sava. Correlation links were found between air temperature and oxygen, Biochemical oxygen demand, as well as suspended matters saturation percentage, but their correlation values are significantly lower. Based on the results of the research it was concluded that air temperature had low effect on changes in water quality during the year and that anthropogenic impact was far more dominant.
Journal of the Geographical Institute Jovan Cvijic, SASA, 2021
The main aim of the research was to determine teachers? opinion on the importance of teaching equ... more The main aim of the research was to determine teachers? opinion on the importance of teaching equipment in geography classroom. The research was conducted during the school year 2020/2021. A total of 134 geography teachers from different districts in Serbia took part in the survey. In general, 57.5% of the participants stated that their school buildings have a specialized and separate geography classroom, while in other schools a classroom is shared between related subjects. It is interesting that 84.3% of the participants stated that in their classrooms they have internet at their disposal. Further, it was concluded that there is no statistically significant correlation between the availability of internet connection and the location of school (rural and urban). On the other hand, one of the biggest problems that 38.8% of the participants highlighted is that maps, which are essential for geography teaching, are approximately 20 years old. On average, the best grade for equipment is...
Polish Journal of Environmental Studies, 2015
Rational and preservation utilization of water resources represents one of the main problems of t... more Rational and preservation utilization of water resources represents one of the main problems of the 21 st century. Water as a resource is a valued quantity, quality, and by location, where the quality is a condition of the water system, expressed through physical-chemical, chemical, and biological indicators. The important aspects taken into consideration when examining the top-priority problems of water quality are economic influence, the influence on human health, influence on the ecosystem, and influence of the geographic area, as well as duration of the influence [1]. Changes in the physico-chemical characteristics of water quality are influenced not only by anthropogenic factors, but also by combined interactive natural processes such as hydrological conditions, topography and lithology, climate, precipitation inputs, catchment area, tectonic and edaphic factors, erosion, weathering of crustal materials and bedrock geology, in combination with environmental influence [2]. It should be also taken into account that the Republic of Serbia is striving toward membership within the EU, and reaching good water quality represents an important challenge [3]. The most important legal framework within the European Union (EU), which regulates water policies, is the Water Framework Directive (WFD) [4]. River systems play an important role in the sustainable development of the whole environment, especially when
Assessment of water quality of the Tisa river (Vojvodina, North Serbia) for ten year period using... more Assessment of water quality of the Tisa river (Vojvodina, North Serbia) for ten year period using Serbian Water Quality Index (SWQI) A Association of young researches "Branislav Bukurov" Faculty
Rational and preservation utilization of water resources represents one of the main problems of t... more Rational and preservation utilization of water resources represents one of the main problems of the 21 st century. Water as a resource is a valued quantity, quality, and by location, where the quality is a condition of the water system, expressed through physical-chemical, chemical, and biological indicators. The important aspects taken into consideration when examining the top-priority problems of water quality are economic influence, the influence on human health, influence on the ecosystem, and influence of the geographic area, as well as duration of the influence . Changes in the physico-chemical characteristics of water quality are influenced not only by anthropogenic factors, but also by combined interactive natural processes such as hydrological conditions, topography and lithology, climate, precipitation inputs, catchment area, tectonic and edaphic factors, erosion, weathering of crustal materials and bedrock geology, in combination with environmental influence . It should be also taken into account that the Republic of Serbia is striving toward membership within the EU, and reaching good water quality represents an important challenge . The most important legal framework within the European Union (EU), which regulates water policies, is the Water Framework Directive (WFD) [4].