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001-es BibID:	BIBFORM063090
Első szerző:	Centeri Csaba
Cím:	Soil erodibility calculations based on different particle size distribution measurements / Csaba Centeri, Zoltán Szalai, Gergely Jakab, Károly Barta, Andrea Farsang, Szilárd Szabó, Zsolt Bíró
Dátum:	2015
ISSN:	2064-5031 2064-5147
Megjegyzések:	In this study we focused on the factors affecting final outputs of the USLE (Universal Soil Loss Equation) model. In doing so, we conducted soil particle size measurements in different institutions (University of Debrecen, University of Szeged and Geographical Institute, Research Centre for Astronomy and Earth Sciences of the Hungarian Academy of Sciences) with a variety of methodologies (laser, aerometer and pipette methods) onvarious soil materials (sandy, loamy and clay). Statistical analyses of the eight examined soil samples have been shown some signifi cant and some non-signifi cant differences among the particle size measurements. This paper is aimed at i) to ascertain whether these signifi cant differences in particle size measurements cause signifi cant differences in soil erodibility calculations; and ii) to assess the amount of soil loss calculated by these K factors. The results suggest that regardless of the relatively small percentage between the smallest and the greatest K factor values, the amount of soil loss can be fairly high, especially when erosion occurs ona longer or steeper slope. In the present case, when we compare simulations results, the amount of soil loss is more important than the difference in percentage between the minimum and maximum values. Because the percentage of the difference can remain the same between the simulations, while the amount of soil lossincreases way beyond soil loss tolerance limits.
Tárgyszavak:	Természettudományok Földtudományok idegen nyelvű folyóiratközlemény hazai lapban methods of particle size measurement soil erodibility USLE
Megjelenés:	Hungarian Geographical Bulletin. - 64 : 1 (2015), p. 17-23. -
További szerzők:	Szalai Zoltán Jakab Gergely Barta Károly Farsang Andrea (1967-2022) (geográfus) Szabó Szilárd (1974-) (geográfus) Bíró Zsolt
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001-es BibID:	BIBFORM058734
Első szerző:	Centeri Csaba
Cím:	Comparison of particle-size analyzing laboratory methods / Centeri Csaba, Jakab Gergely, Szabó Szilárd, Farsang Andrea, Barta Károly, Szalai Zoltán, Bíró Zsolt
Dátum:	2015
ISSN:	1582-9596 1843-3707
Megjegyzések:	Particle size distribution is one of the most influential factors of most soil physical and even some soil chemical characteristics. As modern measurement techniques are being introduced, the need for comparing new methods with older methodologies arises because comparability means data continuity. Here, three institutes conducted a comparison of particle size measurement among the laser, areometer and pipette techniques. The purpose of the comparison was to a) discover any differences among operators, laboratories, and techniques; b) identify if there were any differences and if they could be linked to soil type (e.g. high clay, loam, or sand content) or particle size range; and c) understand if the laser diffraction method gave results that were significantlylarger than the other methods of any size fraction. There was no statistically proven difference between the two operators examined based on the pipette method's result. The comparison of two of the institutes' pipette methods showed statistically significant differences for three of the eight samples tested. However, these differences only seemed to appear in the 0.01 mm to 0.02 mm particle size range. A technical comparison among all three methods resulted in significantdifferences in all cases except for one sample that had very high sand content and very low clay content. Finally, the laser diffraction method was analyzed to see if it measured a larger amount of the clay fraction, however, it instead overestimated the silt and the finesand (0.01 mm to 0.02 mm) fraction, not the clay fraction. Therefore, we conclude that different methodologies can providesignificant difference in particle-size measurement. Based on the results, we recommend creating a widely accepted patent for sample preparation (disaggregation,the use of peroxide or other agents, using ultrasonic or other methods) and for measuring techniques (a set of refractive and sorption indexes, using ultrasonic during the measurement, pump speed etc.).
Tárgyszavak:	Természettudományok Földtudományok idegen nyelvű folyóiratközlemény külföldi lapban areometer laser diffractometry pipette method soil fractions
Megjelenés:	Environmental Engineering and Management Journal. - 14 : 5 (2015), p. 1125-1135. -
További szerzők:	Jakab Gergely Szabó Szilárd (1974-) (geográfus) Farsang Andrea (1967-2022) (geográfus) Barta Károly Szalai Zoltán Bíró Zsolt
Internet cím:	Szerző által megadott URL Intézményi repozitóriumban (DEA) tárolt változat
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001-es BibID:	BIBFORM082566
Első szerző:	Jakab Gergely
Cím:	Spatial analysis of changes and anomalies of intense rainfalls in Hungary / Gergely Jakab, Tibor Bíró, Zoltán Kovács, Ádám Papp, Ninsawat Sarawut, Zoltán Szalai, Balázs Madarász, Szilárd Szabó
Dátum:	2019
ISSN:	2064-5031 2064-5147
Megjegyzések:	Extreme precipitation events can trigger flash flood, mass movements, pluvial flood and accelerated soil erosion. As soil structures are highly degraded due to intensive improper cultivation water infiltration can considerably decrease during the vegetation period. Additional changes in canopy coverage on the soil surface cause relevant variability in infiltration and hence vulnerability against runoff related disasters. Most researchers agree that the frequency of extreme precipitations increases, however, in the Carpathian Basin the uncertainties are quite high. This study aims to compare daily maximum mean precipitation amounts (MMPA) predicted by the Goda-method for June and August as the most probable months of extremities. We used the CarpatClim database as input and predicted MMPAs for two periods, 1960?1985 and 1986?2010. The Goda-method uses monthly data and calculates daily results on given probability. A general increase was found between the first and second half of the period regarding daily maximum precipitation amount in both investigated months. For August the 1-day precipitation amount increased from 56.1 mm to 61.8 mm, whereas 6-days amount from 93.8 mm to 103.2 mm at 1 per cent probability (r = 0.53; p < 0.001). Beyond this change, relevant spatial differences were found. Comparing the macro regions plains had lower increase compared to the mountains, whereas the highest increase was at the. The most endangered location is the southern part of the Transdanubian Hills where parallel with the intensive increase in MMPA both in June and August the environmental conditions such as loose parent material and the high percentage of crop fields also emphasize the potential hazard.
Tárgyszavak:	Természettudományok Földtudományok idegen nyelvű folyóiratközlemény hazai lapban folyóiratcikk extreme precipitation climate change soil erosion flash flood pluvial flood
Megjelenés:	Hungarian Geographical Bulletin. - 68 : 3 (2019), p. 241-253. -
További szerzők:	Bíró Tibor Kovács Zoltán (1988-) (geográfus) Papp Ádám Sarawut, Ninsawat Szalai Zoltán Madarász Balázs Szabó Szilárd (1974-) (geográfus)
Pályázati támogatás:	NKFIH 108755 Egyéb
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001-es BibID:	BIBFORM018826
Első szerző:	Kertész Ádám
Cím:	Biological geotextiles as a tool for soil moisture conservation / Kertész Ádám, Szalai Zoltán, Jakab Gergely, Tóth Adrienn, Szabó Szilárd, Madarász Balázs, Jankauskas Benediktas, Guerra Antonio, Bezerra Fernando, Panomtaranichagul Mattiga, Chau, Dao, Yi Zheng
Dátum:	2011
Megjegyzések:	Geotextiles have an important influence on soil moisture conditions. It is well known that the application of geotextiles increases soil moisture content of the soil, but there is a lack of information on how the different mats keep the soil moisture. The objective of this paper is to present the effect of biological geotextiles on soil moisture dynamics of the topsoil and to compare the effectiveness of various geotextiles in conserving soil moisture as well as comparing their role in soil moisture dynamics in the different climatic zones. Soil moisture measurements were carried out in the framework of the BORASSUS project at six study sites in Brazil, China, Hungary, Lithuania, Thailand, Vietnam. Soil moisture was measured by gravimetric method. All together six different kinds of biological geotextiles (Borassus, Buriti, Bamboo, Jute, Maize and Rice) and one synthetic geotextile were used. To study soil moisture dynamics of the geotextiles applied in Hungary 1000 cm3 soil monoliths were covered by Jute, Buriti and Borassus mats. The effects of natural rainfall events on soils and geotextiles were examined in detail. According to the results of this paper there is not much difference concerning the effect of biological geotextiles made from various materials on soil moisture conservation. There are, however, remarkable differences in conserving soil moisture according to the geographical location of the study sites. The favorable effect of geotextiles on soil moisture conservation could be statistically justified if annual precipitation amount is over 700 mm and the annual temperature range is below 28 °C.
Tárgyszavak:	Természettudományok Földtudományok idegen nyelvű folyóiratközlemény külföldi lapban Biological geotextile Soil moisture BORASSUS Project Soil hydrology
Megjelenés:	Land Degradation & Development. - 22 : 5 (2011), p. 472-479. -
További szerzők:	Szalai Zoltán Jakab Gergely Tóth Adrienn Szabó Szilárd (1974-) (geográfus) Madarász Balázs Jankauskas, Benediktas Guerra, Antonio Bezerra, Fernando Panomtaranichagul, Mattiga Chau, Dao Yi, Zheng
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