Regional scale analysis of trends in rainfall using nonparametric methods and wavelet transforms over a semi‐arid region in India

Pal, Lily; Ojha, C. S. P.; Chandniha, Surendra Kumar; Kumar, Amit

doi:10.1002/joc.5985

Cited by 25 publications

(8 citation statements)

References 83 publications

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“…The intrinsic nature of drought has made understanding, monitoring and evaluating adaptation to drought hazards difficult. In addition, identifying the onset of drought conditions is more difficult than with other natural hazards, as it usually occurs due to many factors which become apparent only after a prolonged period of little or no precipitation [9,10]. The difficulties are also experienced while determining the drought onset, extent and fate [11].…”

Section: Introductionmentioning

confidence: 99%

The Occurrence of Drought in Mopani District Municipality, South Africa: Impacts, Vulnerability and Adaptation

Nembilwi

Chikoore

Kori

et al. 2021

Climate

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Mopani District Municipality in the northeast of South Africa is largely semi-arid and frequently affected by meteorological droughts. The recent 2015/16 event had devastating impacts on water levels, crop yields, livestock herds and rural livelihoods. We investigated the nature of the drought hazard; its impacts, including vulnerability of rural communities in Mopani District and adaptation strategies they have employed to cope with drought. A mixed methods approach with both quantitative and qualitative datasets was used. The district was divided into two distinct climatic areas: the drier eastern lowveld and the wetter western bushveld. Questionnaires were administered among community members whilst key informant interviews were conducted among relevant government and municipal officials. Climate data was used to characterize historical drought using a Standardized Precipitation and Evapotranspiration Index whilst vegetation anomaly maps were used to demonstrate impacts. Spatially distinct patterns of drought conditions were evident with harsh and dry conditions towards the east. It was found that nearly half the time there is some form of drought or another in the district mostly linked to the remote El Nino phenomenon. In several areas, rain-fed agriculture is no longer tenable, with a direct impact on rural livelihoods. A Household Vulnerability Index determined variable levels of vulnerability such that different strategies are employed to adapt to drought some of which cause environmental problems. Local government intervention strategies include supply of seeds and fertilisers, providing cheap fodder and supplying water using trucks. The findings of this study contribute to disaster risk reduction efforts in a region that is highly vulnerable to current and future climate-risks.

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Section: Introductionmentioning

confidence: 99%

The Occurrence of Drought in Mopani District Municipality, South Africa: Impacts, Vulnerability and Adaptation

Nembilwi

Chikoore

Kori

et al. 2021

Climate

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“…In various places in India, it was found that the annual and monsoon time series having similar results in trend analysis even the level of significance is also matched (Patra et al 2012;Chandniha et al 2016;Pal et al 2019). The insignificantly decreasing trends in pre-monsoon and post-monsoon rainfall are found in the majority of districts of Odisha during 1901-2013.…”

Section: Discussionmentioning

confidence: 68%

Assessment of regional-level long-term gridded rainfall variability over the Odisha State of India

et al. 2019

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Odisha State is located in eastern part of India which is blessed with sufficient amount of rainfall. Major part of the state is covered by Mahanadi river basin; Mahanadi river basin originated from Sihawa town and disposed out to Bay of Bengal near Sambalpur, Odisha State. The distribution pattern is erratic and uneven due to climate, topography, hydrology and geomorphology of the state. Catchment area of the Mahanadi is vast; therefore, drainage order is also high (about six); due to these features large amount of water has generated, and it will be appeared as flood at downstream through deltaic region to Bay of Bengal. In this connection, water resources planning and management are one of the crucial issues. For any hydrological study, it is necessary to identify the characteristics and climatic variability of the catchment. In the present study, long-term (1901-2013) rainfall time series has been utilized for rainfall variability analysis using nonparametric tests, viz. Mann-Kendall (MK), modified Mann-Kendall (MMK) and Theil-Sen's slope. The average annual rainfall of the Odisha State is to be found as about 1438 mm; out of them, about 78% occurs in the monsoon season. In the present study, it was found that the maximum and minimum rainfalls occurred at Bhadrak and Puri districts, respectively. As per change point detection, it was found to be as 1945 is shift change year. Further, it was noticed that most of the districts are showing positive trends before change point and vice versa. Similar results are estimated in the monsoon season because most of the rainfall has occurred in the monsoon season. Both positive and negative trends have been found in Odisha State; detailed study has been carried out for rainfall behavior identification of the state. The present study is useful for agricultural and water resources planning and mitigation.

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“…Many researchers and authors suggested similar combinations as presented in Table 2 [7,52,80,83,[88][89][90]. These proposed models may not have a central role to play in the decision-making process regarding trend component existence [14,81].…”

Section: Combining Triangular Trend Analysis Methodology With Discret...mentioning

confidence: 98%

An Enhanced Innovative Triangular Trend Analysis of Rainfall Based on a Spectral Approach

Zerouali

Al‐Ansari

Chettih

et al. 2021

Water

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The world is currently witnessing high rainfall variability at the spatiotemporal level. In this paper, data from three representative rain gauges in northern Algeria, from 1920 to 2011, at an annual scale, were used to assess a relatively new hybrid method, which combines the innovative triangular trend analysis (ITTA) with the orthogonal discrete wavelet transform (DWT) for partial trend identification. The analysis revealed that the period from 1950 to 1975 transported the wettest periods, followed by a long-term dry period beginning in 1973. The analysis also revealed a rainfall increase during the latter decade. The combined method (ITTA–DWT) showed a good efficiency for extreme rainfall event detection. In addition, the analysis indicated the inter- to multiannual phenomena that explained the short to medium processes that dominated the high rainfall variability, masking the partial trend components existing in the rainfall time series and making the identification of such trends a challenging task. The results indicate that the approaches—combining ITTA and selected input combination models resulting from the DWT—are auspicious compared to those found using the original rainfall observations. This analysis revealed that the ITTA–DWT method outperformed the ITTA method for partial trend identification, which proved DWT’s efficiency as a coupling method.

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Regional scale analysis of trends in rainfall using nonparametric methods and wavelet transforms over a semi‐arid region in India

Cited by 25 publications

References 83 publications

The Occurrence of Drought in Mopani District Municipality, South Africa: Impacts, Vulnerability and Adaptation

The Occurrence of Drought in Mopani District Municipality, South Africa: Impacts, Vulnerability and Adaptation

Assessment of regional-level long-term gridded rainfall variability over the Odisha State of India

An Enhanced Innovative Triangular Trend Analysis of Rainfall Based on a Spectral Approach

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