Examination of rainfall data for 110 years using spectral and wavelet analysis

Csaba, Ilyés; Turai, E.; Szűcs, Péter

doi:10.1556/24.61.2018.01

Cited by 6 publications

(7 citation statements)

References 6 publications

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“…This particular 4 to 5 y periodic signal was commonly found to be significant against the red-noise background from an AR1 process (p = 0.8) in the areal average time series of all the groups but was most significant (p > 0.99) in G2. Periodic signals from the same band have been documented previously in the region, e.g., from precipitation [80], other hydroclimate proxy data archives [81], and SGW levels from the Danube-Tisza Interfluve [82] as well; and the common signal found reinforces the link between the behavior of the SGW wells near the rivers' banks and SPI-24. It must be said, however, that further investigations are required to determine its large-scale driving factors.…”

Section: Correlation Analysis With Meteorological Parameterssupporting

confidence: 80%

Delineation of Hydraulic Flow Regime Areas Based on the Statistical Analysis of Semicentennial Shallow Groundwater Table Time Series

Garamhegyi

Hatvani

Szalai

et al. 2020

Water

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Shallow groundwater acts as an important source of water for the ecosystem, agriculture, drinking water supply, etc.; it is, however, among those water resources most sensitive to climate change, and especially to aridification. In the present study, the delineation of regional recharge and discharge zones of the Danube–Tisza Interfluve (Hungary, 8000 km2) is presented via the combination of multivariate time series and geomathematical methods to explore the subregions most sensitive to dewatering. The shallow groundwater level time series of 190 wells, covering a semicentennial period (1961 to 2010), were grouped into three validated clusters representing characteristically different subregions. Then, the subregions’ means and individual shallow groundwater level time series were investigated for long-term trends and compared with local meteorological variability (precipitation, evapotranspiration, etc.) to determine their regime characteristics. As a result, shallow recharge and discharge zones, a gravity-driven flow system, and the discharge zone of a deeper, overpressured flow system could be discerned with distinctive long-term changes in water levels. The semicentennial trends in shallow groundwater levels were significant (p < 0.05) in the recharge (−0.042 m y−1) and in the overpressured discharge zone (0.009 m y−1), and insignificant in the rest of the area (−0.005 m yr−1). The present results concur with previous findings from the area but provide a statistically sound and reproducible delineation of the regime areas on a much finer scale than before. With the determination of the different climatic processes driving the semicentennial trends prevailing in the shallow groundwater, the high vulnerability of the recharge zone is underlined, while the outlined overpressured flow system seems to act independently from semicentennial precipitation trends. This study provides a more in-depth picture of the long-term changes in shallow groundwater and its drivers in of one of the most important agricultural areas in Hungary. It outlines, in a generally applicable way, the most vulnerable subareas for irrigation relaying on shallow groundwater extraction. In addition, the results can help adaptation-strategy decision makers to initiate a more effective and area-focused intervention in the case of the predicted negative trends for vulnerable recharge areas under various climate change scenarios.

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Section: Correlation Analysis With Meteorological Parameterssupporting

confidence: 80%

Delineation of Hydraulic Flow Regime Areas Based on the Statistical Analysis of Semicentennial Shallow Groundwater Table Time Series

Garamhegyi

Hatvani

Szalai

et al. 2020

Water

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“…These DFT based methods have also been applied to long-term precipitation datasets, which cover the Carpathian-Basin, to examine the behavior of the precipitation and shallow groundwater levels in Central Europe (Ilyés et al 2017(Ilyés et al , 2018. With the use of spectral analysis methods, the study was able to define deterministic cycles in precipitation datasets, which are useful tools for forecasting future precipitation totals.…”

Section: Introductionmentioning

confidence: 99%

Differences and similarities between precipitation patterns of different climates

et al. 2021

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In recent years water-related issues are increasing globally, some researchers even argue that the global hydrological cycle is accelerating, while the number of meteorological extremities is growing. With the help of large number of available measured data, these changes can be examined with advanced mathematical methods. In the outlined research we were able to collect long precipitation datasets from two different climatical regions, one sample area being Ecuador, the other one being Kenya. Using the methodology of spectral analysis based on the discrete Fourier-transformation, several deterministic components were calculated locally in the otherwise stochastic time series, while by the comparison of the results, also with previous calculations from Hungary, several global precipitation cycles were defined in the time interval between 1980 and 2019. The results of these calculations, the described local, regional, and global precipitation cycles can be a helpful tool for groundwater management, as precipitation is the major resource of groundwater recharge, as well as with the help of these deterministic cycles, precipitation forecasts can be delivered for the areas.

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“…In summary, short-term cycles prevail in Europe. According to research by Ilyés et al (2017Ilyés et al ( , 2018, there are sites which record as many as a dozen or so such short-term cycles (16-17 at Hungarian sites). According to these authors, the longest rainfall cycles evolve, i.e., they become shorter and shorter, which, as they believe, may be related to the increasing variability of the weather.…”

Section: Resultsmentioning

confidence: 99%

“…We focus only on annual totals as the primary precipitation characteristic. Studies of the cyclicity of precipitation have been conducted for large parts of Europe [20,22] and smaller areas [18,23,24,[26][27][28][29][30][31], as well as for individual sites [19,21,32]. Therefore, the findings made by the authors mentioned above pertain to different parts of the European continent and are based on different inputs, usually not comparable in terms of the study timespan.…”

Section: Introductionmentioning

confidence: 99%

In Search of Periodicity in the Annual Precipitation in Europe (1881–2020)

Walanus

Twardosz

Cebulska

et al. 2022

Water

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A new method of searching for periodicity has been developed on the basis of extensive spatio-temporal data. The result, however, produces little more than doubts. The standard Fourier analysis indicates some periods, namely 3.7-, 7.0-, 8.8-, and 17.5-year periods, and these periodic signals are distributed relatively consistently over some regions of Europe. However, the expectations that the exact harmonic 8.8 years of 17.5 years, and not so exact 3.7 years of 7.0 years will be present at the same or close stations are not fulfilled.

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Examination of rainfall data for 110 years using spectral and wavelet analysis

Cited by 6 publications

References 6 publications

Delineation of Hydraulic Flow Regime Areas Based on the Statistical Analysis of Semicentennial Shallow Groundwater Table Time Series

Delineation of Hydraulic Flow Regime Areas Based on the Statistical Analysis of Semicentennial Shallow Groundwater Table Time Series

Differences and similarities between precipitation patterns of different climates

In Search of Periodicity in the Annual Precipitation in Europe (1881–2020)

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