Browsing by Author "Ptak, Mariusz"
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Item Charakterystyka wybranych parametrów fizyczno-chemicznych jeziora Gostomie (Puszcza Notecka)(Wydawnictwo Poznańskiego Towarzystwa Przyjaciół Nauk, 2017) Ptak, Mariusz; Nowak, BogumiłThe paper presents results of observations from the period 2012–2013 concerning selected physical and chemical water parameters in Lake Gostomie (Noteć Forest, western Poland). They covered: surface water temperature, water temperature in the depth profile, dissolved oxygen concentration in the depth profile, electrolytic conductivity and water transparency. In spite of a short observation period, their detailed record constitutes a reference for comparative research in the future. Collecting similar information over the upcoming years will permit the assessment of the scale and rate of transformations of Lake Gostomie.Item Charakterystyka zlodzenia jezior Wielkopolskiego Parku Narodowego i jego otuliny(Wydawnictwo Poznańskiego Towarzystwa Przyjaciół Nauk, 2013) Choiński, Adam; Ławniczak, Agnieszka; Ptak, MariuszThis study presents the characteristics of ice phenomena occurring on selected lakes in the Wielkopolski National Park based on long-term observations of Góreckie Lake (1971–1992) and fieldwork performed in February 2012 on six other water bodies. The investigation revealed the advancement of ice phenomena appearance within the space of twenty years, as well as the advancement of their disappearance. Such a situation also concerned the ice cover. In turn, the analysis of maximum ice thickness showed an incre- asing trend, while the number of days with compact ice cover decreased. No direct relationship was observed between the rise in average annual water temperature and the delay in the appearance of ice phenomena in a subsequent year. Variation in ice cover thickness measured on the six lakes studied in February 2012 was low and amounted to only 5.5 cm. The thickest (35 cm) and the thinnest (29.5 cm) ice was recorded on the same water body. Fieldwork showed that ice cover thickness was mostly determined by climatic conditions and not influenced by the individual features of the consecutive lakes.Item Effect of the North Atlantic Oscillation on ice phenomena on selected lakes in Poland over the years 1961–2010(Wydział Nauk Geograficznych i Geologicznych Uniwersytetu im. Adama Mickiewicza, 2013) Wrzesiński, Dariusz; Ptak, Mariusz; Baczyńska, AlicjaAn analysis is presented of changes in the parameters of ice phenomena on selected Polish lakes over the years 1961–2010 against the background of variations in the intensity of the North Atlantic Oscillation. The following features were analysed: the start and end of ice phenomena and ice cover, their duration, and the stability of ice cover at observation sites of the Institute of Meteorology and Water Management on lakes located in various physical-geographic regions. Multi-year tendencies of change in the ice parameters under study were identified. The most statistically significant negative trends were observed for the ending dates of ice phenomena and their duration. Changes in the ice characteristics in the different NAODJFM stages were determined on the basis of their deviations: between years with high (> 1.7) and low (< –1.09) values of the winter NAO index, and from average values from the years 1961–2010. Changes in the intensity of the North Atlantic Oscillation affect all the parameters of ice phenomena except their starting dates. In a negative NAODJFM stage, ice phenomena and ice cover end later and last longer; also, the maximum thickness of ice cover is greater, its forms later and is more stable than in a positive stage and in average conditions.Item Evaluation of Methods for Estimating Lake Surface Water Temperature Using Landsat 8(2022-08-08) Dyba, Krzysztof; Ermida, Sofia; Ptak, Mariusz; Piekarczyk, Jan; Sojka, MariuszChanges in lake water temperature, observed with the greatest intensity during the last two decades, may significantly affect the functioning of these unique ecosystems. Currently, in situ studies in Poland are conducted only for 38 lakes using the single-point method. The aim of this study was to develop a method for remote sensing monitoring of lake water temperature in a spatio-temporal context based on Landsat 8 imagery. For this purpose, using data obtained for 28 lakes from the period 2013–2020, linear regression (LM) and random forest (RF) models were developed to estimate surface water temperature. In addition, analysis of Landsat Level-2 Surface Temperature Science Product (LST-L2) data provided by United States Geological Survey (USGS) and the National Aeronautics and Space Administration (NASA) was performed. The remaining 10 lakes not previously used in the model development stage were used to validate model performance. The results showed that the most accurate estimation is possible using the RF method for which RMSE = 1.83 °C and R^2 = 0.89, while RMSE = 3.68 °C and R^2 = 0.8 for the LST-L2 method. We found that LST-L2 contains a systematic error in the coastal zone, which can be corrected and eventually improve the quality of estimation. The satellite-based method makes it possible to determine water temperature for all lakes in Poland at different times and to understand the influence of climatic factors affecting temperature at the regional scale. On the other hand, spatial presentation of thermics within individual lakes enables understanding the influence of local factors and morphometric conditions.Item Inwentaryzacja obiektów krenologicznych dorzecza Odry(Wydawnictwo Poznańskiego Towarzystwa Przyjaciół Nauk, 2009) Choiński, Adam; Ptak, MariuszOn the basis of analysis of hydrographie maps at a scale of 1 : 50 000 an inventory of crenological objects located in the Odra River basin has been made. Altogether 393 map sheets cover the whole area. The studies objects were found on 159 sheets. The obtained data originate from field works or mappings carried out in the years 1998-2005. In total 2611 objects were recorded; most of them are perennial springs (1309), then seepage areas (568), bog-springs (336), intaked perennial springs (129), groups of springs (111), periodical springs (87), mineral springs (66) and observed springs (5). Basing on the output of individual objects the total discharge has been estimated at 1.645 cubic meters per second, that is comparable with the mean annual discharge of such rivers as Lutynia, Mogilnica and Ołobok. Moreover, two maps have been compiled: the first one presents the number of crenological objects on respective sheets, while the other illustrates the summed up output on these sheets. From the point of view of the number of the objects a clear difference between the mountain areas and lowlands can bee seen, however, the difference is smaller if consider the output of the objects. The most abundant springs reach an output of about 50 dm3 • s"1, while only a dozen exceeds 20 dm3 • s '. The sum of 10 most abundant springs makes as many as 23% of the total output of all studied objects. It has to be noticed that as many as 76% of all objects have very low output, that means less than 0.5 dm3 • s-1. Realized inventory of springs seems to be useful, since it makes possible to record future changes in the number and output of crenological objects on a large area.Item Jeziora Pojezierza Wielkopolsko-Kujawskiego jako baza rekreacyjno-wypoczynkowa(Wydawnictwo Poznańskiego Towarzystwa Przyjaciół Nauk, 2012) Ptak, MariuszThe main advantage of the Wielkopolsko-Kujawskie Lake District for recreation and relaxation are its lakes. They are used mainly by residents of the region, due to their ability to access them quickly and thus the associated low costs of transport. The work on the base of topographic maps in a scale of 1 : 50 000, inventoried the recreation basis located around the district’s lakes. Altogether there are 502 such objects. They are located at over 178 lakes, which constitute only 14.7% of all the lakes in the Lake District. The distribution of leisure and recreation infrastructure is chaotic and random, often with better performances in the lake for recreational purposes (such as large surface area) do not have such a building over its banks and there is a smaller lake, with lower quality water, etc.Item Lake evolution in the Żnin region in the years 1912–1960 (central Poland)(Wydział Nauk Geograficznych i Geologicznych Uniwersytetu im. Adama Mickiewicza, 2013) Ptak, MariuszThe evolution of lakes, which, in the final stage, leads to their disappearance, is mainly based on the analysis of surface area change. However, there is one more, frequently overlooked process, which determines lake disappearance – namely the lake shallowing. The present paper presents the direction and rate of such evolution, taking both these processes into account. It is a comparative analysis of 9 lakes in the Żnin region – which has the greatest water deficit in the whole of Poland. Based on bathymetric plans from two periods (early 20th century and early 60’s of the 20th century), the author was able not only to evaluate the scale of surface area change but also to determine the value of lake basins volume change. Both these values were negative and amounted 9.1% and 14.9% respectively. Assuming that the said processes are invariable, the prospective period of lake functioning is about 500 years when taking into consideration surface area change only, and is 150 years shorter when allowing for aquatic resources change. The presented approach to lake disappearance analysis, which treats this phenomenon as a decline in aquatic resources rather than a simple decrease in surface area, is more reliable and therefore, scientific works in this field should take the results of lake shallowing into consideration.Item Najnowsze sondowania wybranych jezior Pojezierza Wielkopolsko-Kujawskiego(Wydawnictwo Poznańskiego Towarzystwa Przyjaciół Nauk, 2014) Choiński, Adam; Ptak, MariuszThe article presents the results of bathymeter measurements of formerly untested lakes of the Wielkopolskie and Kujawskie Lake districts with areas exceeding 50 ha. It has been established that the volume of water in the six lakes amounts to 22,980 [thou. cubic m.] while their total area amounts to 267.9 [ha]. The research results have enriched the available data on the bathymetric parameters of the region in question. At present, in the Wielkopolskie and Kujawskie Lake districts only one lake (with an area exceeding 50 ha) out of 193 has not been provided with detailed information about the hypsometry of the lake’s bottom. Bathymetric measurements conducted in various parts of Poland (both new and those updating the existing bathymetric plans) should be deemed valuable and necessary. These measurements provide a new source of information which serves, among other things, to evaluate the recent direction and rate of evolution of lake basins and the changes to the water resources stored in lake basins.Item Reżim stanów wody wybranych jezior Pojezierza Wielkopolsko-Kujawskiego(Wydawnictwo Poznańskiego Towarzystwa Przyjaciół Nauk, 2015) Plewa, Katarzyna; Wrzesiński, Dariusz; Ptak, MariuszThis article seeks to determine the regime of water stages of two lakes, Lednica and Powidzkie, located in the Wielkopolskie Lake District. In the research, use was made of their daily water-level figures from 1984–2012. In order to establish the regime features of the lakes, the method hitherto applied in river regime studies was employed: an analysis of the temporal structure and type of lake water stages and their changes in an average annual cycle. As the research has shown, Lake Lednica has a 5-period regime structure, while Lake Powidzkie has no characteristic cycle of change in its water levels, a consequence of which is the 2-period structure of its regime. Because of the similarity of the location of the lakes and the natural conditions of their operation, the causes of their different regimes should be sought in their individual features and in human activity.Item Tereny zalewowe w dorzeczu Prosny(Wydawnictwo Poznańskiego Towarzystwa Przyjaciół Nauk, 2014) Choiński, Adam; Ptak, MariuszBased on the data provided in hydrographic maps of Poland (1:50000), we can present the range and calculate the flood-hazard area in the Prosna river basin. It has been established that the total flood-hazard area amounts to 190.5 sq. km, which represents almost 4% of the river catchment. The largest areas of the type are located directly in the Prosna river valley (127.1 sq. km) and in the Pratwa river catchment (24.5 sq. km). On top of that, historical data on the water levels at the Bogusław station have been juxtaposed (1951-1983). An analysis of the average levels and the extreme annual levels has indicated that in the former case, no trend has been detected, while the extreme levels tend to have been growing. Therefore, a rising trend has been noted with reference to the emergency levels (250 cm) and alarm levels (300 cm). The year 1979 was exceptional in this respect, as the alarm level was recorded fourteen times, and the emergency level was recorded twenty eight times.Item Zmiany jeziorności w środkowym i dolnym dorzeczu Warty od XIX wieku(2010-10-13T07:40:52Z) Ptak, Mariusz; Choiński, Adam. PromotorPraca nawiązuje do głównych problemów limnologii: zmian jeziorności, zmian powierzchni jezior oraz przyczyn tych zmian. Przeprowadzona analiza dotyczy dolnego i środkowego dorzecza Warty, stanowiącego około 10% kraju. Opracowano ją w oparciu o materiał kartograficzny (mapy topograficzne z końca XIX wieku oraz mapy topograficzne z końca XX wieku), w przedziale czasowym wynoszącym 110 lat. Uzyskane wyniki pokazują znaczny spadek zarówno wskaźnika jeziorności (o 10.7%), powierzchni jezior (o 10,8%) oraz liczby jezior (o 15,5%). Na podstawie analizy statystycznej ustalono, że największy związek występuje pomiędzy zanikiem powierzchni jezior a jeziorami najmniejszymi (1-5 ha).Item Zmiany koryta Noteci w jej środkowym odcinku(Wydawnictwo Poznańskiego Towarzystwa Przyjaciół Nauk, 2016) Kaniecki, Alfred; Ptak, MariuszThe paper analyses the changes in middle course of the Noteć River channel i.e. from Nakło to Ujście. The research was carried out by means of the cartographic method surveying environmental changes. Based on the cartographic material from four different periods of time, the occurrence of considerable changes was determined in the period between the second half of the 18th century and the beginning of the 21st century. The observed transformation was attributed mainly to the anthropogenic factors, including any hydrotechnical works related to e.g. the river’s regulation and drainage works in the river valley. Such activities are aimed at a more efficient use of the Noteć River for economic purposes.Item Zmiany powierzchni jezior na Pojezierzu Wielkopolsko-Kujawskim w XX w.(Wydawnictwo Poznańskiego Towarzystwa Przyjaciół Nauk, 2007) Nowacka, Agnieszka; Ptak, MariuszThe study presents the changes of lake surfaces in Wielkopolsko-Kujawskie Lake District in the 20th century. The changes are the result of natural processes (the oscillations of climate, sedimentation) as well as artificial ones – caused by man (the barring of rivers, the drainage of the terrain etc.). The above mentioned area, as one of the most economically developed in the country, was quite early subjected to hydotechnical works. It is stated, based on the calculations, that in the discussed area there are 1212 lakes (of the surface bigger than 1 hectare) whose total surface is 40037,7 hectares and these are much smaller than the ones noted at the beginning of the 20 th century which were surface changes, this area was correlated with natural factors, such as for example the size of precipitation. This analysis, did not bring the clear answer to our question. To provide a detailed answer to this question, one has to carry out a multi-faceted analysis however, this exceeds the scope at the present study. Assuming that present disappearance, that is 19.2%, would remain constants for a hundred years (19.2%/100), we can state that the lakes of Wielkopolsko- Kujawskie Lake District will disappear in about 500 years.Item Zmienność stanów wody rzeki Czerna Wielka w latach 1961-2010(Wydawnictwo Poznańskiego Towarzystwa Przyjaciół Nauk, 2014) Choiński, Adam; Ptak, Mariusz; Łabędzka-Gardy, MariaDaily observations of the levels of water in the Czerna Wielka river have been followed by an analysis of the relevant fluctuations. It has been established that in the Żagań profile (closing the catchment), the course of the water levels show a downward trend. The average water level in the timeframe 1961–2010 amounted to 108.3 cm (42.63 inches). The highest annual level occurred in 1981 (136.8 cm = 53.85 inches) while the lowest level was recorded in 1991 (82.1 cm = 32.32 inches). As for specific seasons, the water levels tend to be clearly highest in the winter months (with peaks in January and March) while the lowest levels are characteristic of the vegetation season (July–August). What is more, an analysis has been carried out of the water levels in two other observation stations located in an upper part of the catchment, where a reverse trend has been recorded (in 1971–1993). This indicates that in the specified time, the water level has tended to rise, unlike in the Żagań station in the same period of analysis. This situation may result from the catchment’s diversity with respect to the natural conditions (lithology) as well as human activity (hydraulic structures).Item Zróżnicowanie grubości pokryw lodowych wybranych jezior Wielkopolski(Wydawnictwo Poznańskiego Towarzystwa Przyjaciół Nauk, 2013) Choiński, Adam; Ptak, MariuszIn this study the thickness of ice cover on six lakes in Wielkopolska was measured. Lakes were selected so that they were located on a north-south axis and the distance between the furthermost water bodies amounted to 105 km. The remaining features of the lakes were random. The investigation revealed that the va- riability in ice cover thickness was rather low, not exceeding 4 cm. In the case of Kórnickie Lake, the number of measurements performed was higher (20 boreholes; 2 boreholes in the remaining lakes) in order to assess the variation in ice cover thickness within one lake. Those analyses revealed that the difference amounted to only 2 cm. The thinnest ice cover was observed in the inflow and outflow areas of the Głuszynka river. Analysis of the relationship between ice cover thickness and latitude showed that it increased to the south. That thesis, however, must be verified by more detailed research which would include more lakes, their individual features and synchronized time series of at least several years.