Quantification of agricultural drought over Indian region: a multivariate phenology-based approach

Das, Prabir Kumar; Das, Rituparna; Das, Dilip Kumar; Midya, S. K.; Bandyopadhyay, Samir Kumar; Raj, Uday

doi:10.1007/s11069-020-03872-6

Cited by 12 publications

(4 citation statements)

References 44 publications

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“…Ideally, the WVCI should be compared with drought impact data to determine its usefulness for monitoring vegetative drought [20,42]. Due to the scarcity of these data, this paper employed Pearson correlation coefficient to test the relationship between the WVCI and the VCI for proving the effectiveness of the WVCI in assessing the drought conditions across the LP.…”

Section: Validation Of the Wvcimentioning

confidence: 99%

“…Surveys such as that conducted by Walz et al [41] showed that the effects of drought on the initial and middle stages of vegetation growth were greater than those at the end of vegetation growth. In India, another study by Das et al [42] pointed out that the impact of drought on agriculture varies depending on when it happens and how long it lasts. Hence, Graw et al [4] developed a weighted linear combination (WLC) method to account for crop growing stages vulnerable to drought, and they concluded that the WLC was more accurate for assessing drought severity than yearly median VCI values over the vegetation growing season in the Eastern Cape Province, South Africa.…”

Section: Introductionmentioning

confidence: 99%

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Drought Assessment on Vegetation in the Loess Plateau Using a Phenology-Based Vegetation Condition Index

Zong

et al. 2022

Remote Sensing

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Frequent droughts induced by climate warming have caused increasing impacts on the vegetation of the Loess Plateau (LP). However, the effects of drought on vegetation are highly dependent on when the drought occurs and how long it lasts during the growing season. Unfortunately, most of the existing drought indices ignore the differences in the drought effects on different vegetation growth stages. In this study, we first established a phenology-based vegetation condition index, namely weighted vegetation condition index (WVCI), which accounts for the differences in vegetation sensitivity to drought by assigning specific weights to different phenological stages of vegetation. Then, we used the WVCI to reveal the temporal and spatial variations in vegetative drought from 2001 to 2019 over the LP from the aspects of drought frequency, trend and relative deviation. The results showed that (1) the LP experienced frequent droughts during the study period, but mainly mild and moderate droughts. The drought frequencies decreased from southeast to northwest, and extreme droughts rarely occurred in mountainous areas and plains. (2) The droughts in most areas of the LP tended to ease, and only a few areas in the Hetao Plain, Ningxia Plain and Fenwei Plain showed an increasing trend of drought. (3) After 2012, the departure percentage of WVCI in most areas of the LP was positive, indicating above-average vegetation conditions. (4) Compared with the well-established vegetation condition index, the WVCI proved to have the ability to monitor and assess vegetative drought on an annual scale in the LP. As a result, our research could help develop and implement drought-resistance and disaster-prevention measures on the LP.

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Section: Validation Of the Wvcimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Drought Assessment on Vegetation in the Loess Plateau Using a Phenology-Based Vegetation Condition Index

Zong

et al. 2022

Remote Sensing

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“…Murthy et al [68] and Guhathakurta et al [69] suggest a high probability of drought in Tamil Nadu, in south India, and Dhiman [70] states that most of the districts in Tamil Nadu are overexploiting groundwater due to monsoonal failure. Similarly, Chandrasekar et al [71], Varadan and Kumar [72], Vaani and Porchelvan [73], Balasundareshwaran et al [74], and Das et al [75] suggested that the Ariyalur district is the most vulnerable, with moderate-to-high agricultural drought.…”

Section: Discussionmentioning

confidence: 96%

Monitoring of Multi-Aspect Drought Severity and Socio-Economic Status in the Semi-Arid Regions of Eastern Tamil Nadu, India

Venkatesh

Kantamaneni

Thilagaraj

et al. 2022

Water

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A framework was set up to monitor drought in the semi-arid regions of eastern Tamil Nadu, southern India, for the period of 2014–2018 CE with the application of the standardized precipitation index (SPI), the scaled drought-condition index (SDCI), and the standardized water-level index (SWI). The results emphasized that this region had a negative precipitation anomaly and vegetative stress, both of which triggered meteorological and agricultural droughts and caused significant losses in the farming sector. The distributions of extreme and high-level hydrological droughts were at their maximum in 2017 CE. The multi-drought severity index (MDSI), implemented to assess the combined impact and highlighting the gradient of affected areas, illustrated that the eastern region (i.e., Jayankondam block) was the most extremely affected, followed by the northern and southern regions (i.e., T.Palur and Andimadam), which were moderately affected by droughts. The extremely affected eastern region has less of an ability to overcome droughts due to its socio-economic vulnerability, with its greater population and household density leading to the over-exploitation of potential resources. Therefore, the focus of this study is on the monitoring of drought severity in micro-administrative units to suggest an appropriate management plan. Hence, the extreme-drought-prone block (Jayankondam) should be given high priority in monitoring and implementing long-term management practices for its conservation and resilience against the effects of severe droughts.

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“…Since drought is often caused by a decrease of precipitation below the normal amount, agricultural productivity is usually the most affected due to its direct dependence on water resources, especially soil moisture. Drought begins when the soil moisture available to plants drops to a level that adversely affects the crop yield and, consequently, agricultural production [6,7]. The decline of agricultural production indirectly causes critical issues such as food insecurity, which may eventually lead to socio-economic consequences.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity of the Evapotranspiration Deficit Index to Its Parameters and Different Temporal Scales

Wambura

2021

Hydrology

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Sound estimates of drought characteristics are very important for planning intervention measures in drought-prone areas. Due to data scarcity, many studies are increasingly using less data-intensive approaches, such as the evapotranspiration deficit index (ETDI), in estimations of agricultural droughts. However, little is known about the sensitivity of this specific ETDI formula to its parameters, and to data at different temporal scales. In this study, a general ETDI formula, homologous to the specific ETDI formula, was introduced and used to test the sensitivity of the ETDI to its parameters and to data at different temporal scales. The tests used time series of remotely sensed evapotranspiration data in the Ruvu River basin in Tanzania. The parameter sensitivity tests revealed that ETDI is sensitive to its parameters, and different parameter combinations resulted in different drought characteristics. The temporal scale sensitivity test showed that drought characteristics, such as the number of drought events and the total drought durations, decreased as the temporal scale increased. Thus, an inappropriate temporal scale may lead to the misrepresentation of drought characteristics. To reduce uncertainty and increase the accuracy of ETDI-based agricultural drought characteristics, ETDI requires parameter calibration and the use of data with small temporal scales, respectively. These findings are useful for improving estimations of ETDI-based agricultural droughts.

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Quantification of agricultural drought over Indian region: a multivariate phenology-based approach

Cited by 12 publications

References 44 publications

Drought Assessment on Vegetation in the Loess Plateau Using a Phenology-Based Vegetation Condition Index

Drought Assessment on Vegetation in the Loess Plateau Using a Phenology-Based Vegetation Condition Index

Monitoring of Multi-Aspect Drought Severity and Socio-Economic Status in the Semi-Arid Regions of Eastern Tamil Nadu, India

Sensitivity of the Evapotranspiration Deficit Index to Its Parameters and Different Temporal Scales

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