Trend analysis in reference evapotranspiration using Mann-Kendall and Spearman's Rho tests in semi arid region of North Gujarat

Makwana, Jaydip J.; Deora, B. S.; Parmar, B.; Patel, C. A.

doi:10.5958/2455-7145.2020.00023.5

Cited by 4 publications

(3 citation statements)

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“…There is a significant trend at the α significance level in the time series examined according to the H 1 hypothesis. If the Z MK (or S) value is negative, it indicates the presence of a decreasing trend, and if it is positive, it indicates the presence of an increasing trend (Mianabadi et al 2022;Makwana et al 2020).…”

Section: Mann-kendall (Mk) Testmentioning

confidence: 99%

“…For this purpose, various trend methods are used, both parametric and nonparametric, as well as providing statistical and graphical evaluation. For the past few decades, methods such as Mann-Kendall (MK), sequential Mann-Kendall (SMK), Spearman's rho (SRho), Sen's t, Sen's slope, linear regression (LR) and cumulative sum (CS) have been common in determining trends in hydrometeorological time series (Makwana et al 2020;Koycegiz and Buyukyildiz 2021;Patakamuri et al 2020;Shahid 2011;Yenigun et al 2008;Yue et al 2002). Rahman et al (2017) examined the annual, monthly and dry season precipitation trends of Bangladesh and found no significant trend in annual mean precipitation and dry season precipitation for the whole country, while increasing and decreasing trends were obtained in long-term monthly precipitation.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of annual total precipitation in the transboundary Euphrates–Tigris River Basin of Türkiye using innovative graphical and statistical trend approaches

Büyükyıldız

2022

Appl Water Sci

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The Euphrates–Tigris River Basin (ETRB), one of the largest river basins in the Middle East, is also among the most risky transboundary basins in the world. ETRB has a critical importance for the region both politically and economically due to its location. Evaluating the increasing regional impacts of climate change is even more important for the sustainable management of water and soil resources, especially in transboundary basins such as ETRB. Türkiye is one of the most important riparian countries of the ETRB and the Türkiye part of ETRB constitutes the headwater of the basin. In this study, the temporal variability of the annual total precipitation data for the period 1965–2020 of eighteen stations located in the Türkiye part of the ETRB was investigated. Classical Mann–Kendall (MK) test was used to statistically determine the monotonic trend of precipitation. In addition to the MK method, analyses were carried out with three innovative trend methods, which have the ability to interpret trends both statistically and graphically. These innovative trend methods are Şen innovative trend analysis (Şen-ITA), Onyutha trend test (OTT) and trend analysis with combination of Wilcoxon test and scatter diagram (CWTSD). The results obtained show that there is a decreasing trend in annual total precipitation in ETRB according to all trend methods generally used for the examined period. In addition, the results obtained from the relatively new OTT and CWTSD methods show strong consistency with the results of the other two methods. The advantages such as performing numerical and visual trend analysis with innovative OTT and CWTSD methods, identifying trends in low–medium–high value data and detecting sub-trends have shown that these methods can be used as an alternative to the widely used MK and Şen-ITA.

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Section: Mann-kendall (Mk) Testmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evaluation of annual total precipitation in the transboundary Euphrates–Tigris River Basin of Türkiye using innovative graphical and statistical trend approaches

Büyükyıldız

2022

Appl Water Sci

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“…These methods have also been used in many studies (Caloiero 2018;Nissansala et al 2020;Bora et al 2022;Achite et al 2021;Ahmed et al 2022;Umar et al 2022). The hydrometeorological parameters determining the trends such as precipitation (Chaouche et al 2010;Li et al 2011), temperature (Dawood 2017;Gavrilov et al 2018), evaporation (Tabari et al 2011;Makwana et al 2020) and relative humidity (Salami et al 2016;Fallah et al 2022) plays an important role in climate change and in the planning, construction and management of water resources. Saplıoğlu (2015) proposed a new method based on the graphic method developed by Şen in his study.…”

Section: Introductionmentioning

confidence: 99%

WITHDRAWN: The evaluation of monthly precipitation and average temperature by using innovative graphical and statistical trend approaches: Palu station example

Acar

2023

Preprint

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Climate change occurring worldwide due to global warming affects rainfall, flow, humidity and temperature, etc. in many regions. It has begun to significantly change the regimes of hydro-meteorological parameters. It is extremely important to analyze the future changes of these parameters, which significantly affect the management of water resources, ecosystems and agricultural activities. In this study, the temporal variability of monthly total precipitation (1965–2012) and monthly average temperature (1965–2020) data of Palu station located within the borders of Elazığ province in Turkey was investigated. Mann-Kendall (MK) and Spearman's Rho (SR) test statistics were used to statistically determine the trends of temperature and precipitation data. In addition to these methods, analyzes were carried out with three innovative trend methods that are capable of interpreting trends both statistically and visually. These innovative trend methods are Innovative Polygon Trend Analysis (IPTA), Innovative Şen Test (Şen-ITA) and trend analysis with the combination of Wilcoxon test and scatter diagram (CWTSD). In addition, precipitation and temperature data were subjected to regression analysis separately and sets of equations were obtained and the decrease-increase amounts were determined in mm and ⸰C. In particular, the IPTA method was applied separately for the arithmetic mean and standard deviation, and the transitions between the increasing and decreasing regions of the trends on a monthly basis were determined and the slopes and lengths of the trends resulting from these transitions were calculated. With the application of the IPTA method, an increasing trend in some months and a decreasing trend in other months were detected for the two parameters. In addition, when the results of precipitation and temperature data were examined, it was seen that there was no single or regular polygon in the IPTA graphs, so both parameters varied over the years and did not exhibit a homogeneous behavior. In the MK test, SR test, Wilcoxon test statistics, Şen-ITA and NO-ITA methods, apart from some months in which increasing and decreasing trends were detected, months in which no trend could be detected, that is, there was no trend, were also observed. When the results obtained from the analysis of two parameters from the relatively new CWTSD method are examined, they show strong consistency with the results of the MK test, SR test and Şen-ITA methods. Advantages such as performing numerical and visual trend analysis with the CWTSD method and determining the trends of data with low-medium-high values have shown that this method can be used as an alternative to the MK test, SR test and Şen-ITA methods that are widely used in the literature. Finally, the IPTA method was evaluated to be more sensitive in determining trends on a monthly basis compared to other methods used in the study..

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WITHDRAWN: The evaluation of monthly precipitation and average temperature by using innovative graphical and statistical trend approaches: Palu station example

2023

Preprint

View full text Add to dashboard Cite

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Trend analysis in reference evapotranspiration using Mann-Kendall and Spearman's Rho tests in semi arid region of North Gujarat

Cited by 4 publications

References 0 publications

Evaluation of annual total precipitation in the transboundary Euphrates–Tigris River Basin of Türkiye using innovative graphical and statistical trend approaches

Evaluation of annual total precipitation in the transboundary Euphrates–Tigris River Basin of Türkiye using innovative graphical and statistical trend approaches

WITHDRAWN: The evaluation of monthly precipitation and average temperature by using innovative graphical and statistical trend approaches: Palu station example

WITHDRAWN: The evaluation of monthly precipitation and average temperature by using innovative graphical and statistical trend approaches: Palu station example

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