Analysis of trends in rainfall and dry/wet years over a century in the Eastern Ganga Canal command

Krishan, Radha; Nikam, Bhaskar R.; Pingale, Santosh Murlidhar; Chandrakar, Ayush; Khare, Deepak

doi:10.1002/met.1721

Cited by 11 publications

(3 citation statements)

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“…The average annual rainfall of the Yuqiao Reservoir Watershed is 709.2 mm. To separate the dry, wet, and normal years, deviation (≥25%) from the mean annual rainfall was used to create them, meaning that a negative deviation can be defined as dry years and a positive deviation is termed as wet years [ 45 ]. Therefore, three continuous years—2019 (−31.5%), 2020 (4.7%), and 2021 (34.7%)—were selected for further analysis as the representatives of dry, normal, and wet years, respectively, which may minimize the potential effect from the land use change compared to a large time interval.…”

Section: Methodsmentioning

confidence: 99%

The Effect of Rainfall on Aquatic Nitrogen and Phosphorus in a Semi-Humid Area Catchment, Northern China

Shou

Tian

Zeng

et al. 2022

IJERPH

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The impact of rainfall on water quality may be more important in semi-arid regions, where rainfall is concentrated over a couple of months. To explore the impact of rainfall changes on water quality, e.g., nitrogen (TN) and phosphorous (TP), the diversion from Luan River to Tianjin Watershed in the northern semi-humid area was selected as the study area. TN and TP concentrations in rivers and the Yuqiao Reservoir during the three-year high-flow season (2019–2021) were analyzed. The response relationship and influencing factors among the watershed’s biogeochemical process, rainfall, and water quality were clarified. The results showed that rainfall in the high flow season mainly controlled the river flow. The concentration of TN and TP in the inflow rivers is regulated by rainfall/flow, while the concentration of TN and TP in the water diversion river has different variation characteristics in the water diversion period and other periods. The lowest annual concentrations of TN and TP were observed in the normal year, while the highest annual concentration was observed in the wet year, indicating that the hydrological process drove the nutrient transport in the watershed. For the tributaries, the Li River catchment contributed a large amount of N and P to the aquatic environment. For the reservoir, the extreme TN concentrations were the same as the tributaries, while the extremes of TP concentrations decreased from the dry year to wet year, which was in contrast to the tributaries. The spatial variation of TN and TP concentrations in the reservoir showed that the concentration decreased following the flow direction from the river estuary to the reservoir outlet. Considering climate change, with the increase of rainfall in North China in the future, the TN and TP transport fluxes in the watershed may continue to increase, leading to the nitrogen and phosphorus load of the downstream reservoir. To ensure the impact of the increase of potential N and P output fluxes in the watershed on the water quality of the reservoir area, it is necessary to strengthen the effective prevention and control of non-point source pollution in the watershed.

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Section: Methodsmentioning

confidence: 99%

The Effect of Rainfall on Aquatic Nitrogen and Phosphorus in a Semi-Humid Area Catchment, Northern China

Shou

Tian

Zeng

et al. 2022

IJERPH

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“…During the winter, summer, monsoon, and postmonsoon seasons, the magnitudes of rainfall trends with a corresponding value of Sen's estimator are 0.5, 2.137, 6.901, and −2.276 mmÁyear −1 , F I G U R E 1 (a) Location of Andhra Pradesh State (shaded area in the red square) in India (b) the elevation (m) map of southern peninsular India (SRTM DEM, 3 arcsec) and the pink "*" represents the geographical location of the measurement site respectively, with a 90% of the significance level. The variability in rainfall affects water supply at different stages of crop development to meet the crop water demand (Krishan et al, 2018).…”

Section: Temporal Trends Of Temperature and Rainfallmentioning

confidence: 99%

Long‐term (2001–2020) trend analysis of temperature and rainfall and drought characteristics by in situ measurements at a tropical semi‐arid station from southern peninsular India

Thotli

Gugamsetty

Kalluri

et al. 2022

Intl Journal of Climatology

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With the effects of climate change prevailing worldwide, it is essential to understand the long-term rainfall and temperature trends at regional scales to plan for adaptation strategies. Investigating the temporal dynamics of meteorological variables in climate-induced changes, particularly in rain-fed agriculture countries such as India, is needful. The present study focused on the temporal variation of rainfall and temperature trends to analyse the drought characteristics over the past 20 years (2001-2020) using ground-based Automatic Weather Station (AWS) data at a semi-arid station Anantapur in southern peninsular India. The seasonal maximum mean temperature (T mean ) was observed in summer (32.20 ± 1.36 C), followed by the monsoon (29.08 ± 1.02 C), postmonsoon (26.45 ± 2.44 C), and winter (25.45 ± 1.01 C) during the study period. The Mann-Kendall trend test result showed the decreasing trend in seasonal mean temperature during the drying period (winter [−0.069 CÁyear −1 ] and summer [−0.081 CÁyear −1 ]) and increasing trend in the wetting period (monsoon [0.012 CÁyear −1 ] and postmonsoon [0.034 CÁyear −1 ]). On the other hand, the seasonal rainfall decreases in the postmonsoon (−2.276 mmÁyear −1 ) while increasing in winter (0.5 mmÁyear −1 ), summer (2.137 mmÁyear −1 ), and monsoon (6.901 mmÁyear −1 ) seasons. The annual trends of minimum, maximum, and mean monthly temperatures decrease at the rate of −0.121, −0.123, and −0.022 CÁyear −1 , respectively, while the rainfall increases at the rate of 8.979 mmÁyear −1 . Furthermore, the temporal evolution of meteorological drought characteristics was estimated with the help of the standardized precipitation index (SPI) and standardized precipitation evapotranspiration index (SPEI) on multiple timescales ranging from 1 to 24 months on a monthly basis during the study period. The 24-month SPI values showed that 1 "severely dry" and the 29 "moderately dry" long-term

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“…(2014) conducted change detection study on climatic parameter over Raipur district of India and found significant rising trend in summer temperature with rising evaporation process attributed to increased wind speed and temperature. Krishan et al (2017) analysed the trends in rainfall and dry/wet years over a canal command area of Northern India. Study found a significant decreasing trend in annual and monsoon rainfall.…”

Section: Introductionmentioning

confidence: 99%

Pan evaporative changes in transboundary Godavari River basin, India

Jhajharia

Gupta

Mirabbasi

et al. 2021

Theor Appl Climatol

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Pan evaporative changes are one of the key components of water resources management of a basin under changing climate and anthropogenic-induced warming. This study was undertaken for trans-boundary Godavari River (India) to identify trends through the Mann-Kendall (MK) test after removing the effect of significant lag-1 serial correlation from the climatic time-series by pre-whitening in pan evaporation (Epan) and in the probable causative meteorological parameters responsible for evaporative climatic changes in a large basin. Further, the Pettitt's test was applied on Epan time series for estimating the change point year of Epan to find out the effective year when the change in pattern started reflecting in the time-series. At seasonal (monthly) time scales, statistically significant decreasing trends in Epan were witnessed in pre-monsoon season (in the months of March, April and May) over all the seven sites of the Godavari basin. Four sites witnessed statistically significant increasing trends in Tmin (Tmax) in July (December) and in monsoon (post monsoon) season in the basin. Statistically significant decreasing (increasing) trends in wind speed (relative humidity) in pre-monsoon and in month of March at these seven sites support the observed decline in the evaporative demand in the basin leading to possible enhancement in the total yield of the basin. Results of stepwise regression analysis showed that wind speed followed by relative humidity was found to be two main causative parameters of the observed decline in the Epan under the warmer environments in the basin. Pettitt's test shows year 1991-1992 to be the probable year of change in the Epan in the Godavari river basin.

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Analysis of trends in rainfall and dry/wet years over a century in the Eastern Ganga Canal command

Cited by 11 publications

References 50 publications

The Effect of Rainfall on Aquatic Nitrogen and Phosphorus in a Semi-Humid Area Catchment, Northern China

The Effect of Rainfall on Aquatic Nitrogen and Phosphorus in a Semi-Humid Area Catchment, Northern China

Long‐term (2001–2020) trend analysis of temperature and rainfall and drought characteristics by in situ measurements at a tropical semi‐arid station from southern peninsular India

Pan evaporative changes in transboundary Godavari River basin, India

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