Implications of rainfall variability on groundwater recharge and sustainable management in South Asian capitals: An in-depth analysis using Mann Kendall tests, continuous wavelet coherence, and innovative trend analysis

Fattah, Md. Abdul; Hasan, Md. Mahedi; Dola, Irin Akter; Morshed, Syed Riad; Chakraborty, Tanmoy; Kafy, Abdulla - Al; Alsulamy, Saleh; Khedher, Khaled Mohamed; Shohan, Ahmed Ali A.

doi:10.1016/j.gsd.2023.101060

Cited by 9 publications

(2 citation statements)

References 55 publications

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“…The results showed that as the cathode flow rate decreased, the main frequency of i gradually decreased in the 1-40 kHz range, and since the instability of plasma mode competition and excitation the main frequency of i is oscillates violently in the 100-500 kHz. However, using the Mann-Kendall trend test [39][40][41], at the 95% confidence level, the standardized test statistic value of this set of data is 4.447, that is, there is a significant upward trend in this data.…”

Section: Resultsmentioning

confidence: 84%

Indicator of abnormal cathode electron emission state with gas flow in Hall thrusters

Li,

Zhou,

et al. 2024

J. Phys. D: Appl. Phys.

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The accurate diagnosis of abnormal electron emission state in hollow cathodes is crucial for the stable operation of Hall electric propulsion systems. In this study, a method of reducing the cathode working gas flow rate was used to simulate abnormal working conditions in which the cathode electron emission state (CEES) was deteriorating. By analyzing and comparing the oscillation signals under abnormal and steady-state working conditions, it was found that as the CEES deteriorated, the power content of the breathing oscillation decreased in the 1–40 kHz frequency band, and the main frequency decreased; in contrast, the power content of the transit-time oscillation increased in the 100–500 kHz range, and the main frequency was on the rise. Combined with the current growth rate analysis of breathing and transit-time oscillations, when the cathode gas flow rate decreases, the CEES deteriorates, the coupling voltage drop increases, and the potential drop in the channel decreases. The electron temperature and nonlinear power absorption of the electrons decrease, leading to a decrease in the growth rate of breathing oscillations and the breathing oscillation weakens; however, the time-averaged ion velocity and ion sound velocity in the channel decrease simultaneously, but the ion velocity decreases significantly faster than the ion sound velocity, leading to an increase in the growth rate of the transit-time oscillation, and the transit-time oscillation strengthen. Through comparison of the oscillation signals under different working conditions, such as varied anode flow rate, anode voltage, magnetic induction, it was proven to be a unique feature of CEES deteriorates, and can be used as an indicator of CEES deteriorates during the on-orbit operation of the Hall-effect thrusters.

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Section: Resultsmentioning

confidence: 84%

Indicator of abnormal cathode electron emission state with gas flow in Hall thrusters

Li,

Zhou,

et al. 2024

J. Phys. D: Appl. Phys.

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“…The study of spatiotemporal variations in precipitation has received considerable attention in recent years due to its significance in natural systems and human society [1][2][3][4][5][6][7]. Based on daily precipitation data, numerous studies have revealed a considerable increase in extreme rainfall events and annual maximums globally [7][8][9]. Bangladesh belongs to the Asian monsoon regime, defined by a seasonal reversal of surface winds and a distinct seasonality of precipitation (dry and wet) [10,11].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the onset, withdrawal, and variability of monsoon rainfall in the face of climate change

Shariot-Ullah,

Akhter,

Acharjee

et al. 2024

Discov Atmos

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Climate change is affecting the precipitation system in Bangladesh, particularly in the northwestern hydrological zone. This study analyzed the monsoon rainfall variability from 1991 to 2015, revealing a shifting pattern and past trends. This study used the Mann–Kendall test and Sen’s slope (MAKESENS) statistical model to evaluate the annual total rainfall and monsoon rainfall. Approximately 71–78% of the total rainfall occurred during the monsoon season at all stations, with Rangpur being the rainiest and Rajshahi being the driest. The annual rainfall trend decreased, with highly variable arrival and withdrawal days. The monsoon arrived early by 2 to 39 days and late by 1 to 72 days from the reference day. The withdrawal of monsoon rainfall occurred 1 to 38 days early and 1 to 39 days late. These findings can be used to plan and manage agricultural practices at the local level in northwestern Bangladesh.

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Innovative Technologies for Effective Water Resources Management

Kumar,

Choudhury

2024

Water Crises and Sustainable Management in the Global South

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Implications of rainfall variability on groundwater recharge and sustainable management in South Asian capitals: An in-depth analysis using Mann Kendall tests, continuous wavelet coherence, and innovative trend analysis

Cited by 9 publications

References 55 publications

Indicator of abnormal cathode electron emission state with gas flow in Hall thrusters

Indicator of abnormal cathode electron emission state with gas flow in Hall thrusters

Analysis of the onset, withdrawal, and variability of monsoon rainfall in the face of climate change

Innovative Technologies for Effective Water Resources Management

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