Rainfall variability over the Indus, Ganga, and Brahmaputra river basins: A spatio-temporal characterisation

Patel, Akansha; Goswami, Ajanta; Dharpure, Jaydeo K.; Thamban, Meloth

doi:10.1016/j.quaint.2020.06.010

Cited by 27 publications

(16 citation statements)

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“…Similarly, the largest wetlandscape area for the study period and the revival of the linear wet belt in 2008 are attributed to a good monsoonal rainfall in that year (Patel et al, 2021). However, after 2008, the total wet area in the wetlandscape exhibited a continuously decreasing trend (Figure 5) irrespective of the monsoonal rainfall (Patel et al, 2021). Also, the northern linear wet belt was also fragmented after 2008 greatly and eventually disappeared by 2019.…”

Section: Results and Analysismentioning

confidence: 95%

“…The total wet area in the Haiderpur wetland reduced from 1283.5 ha in 1993 to 862.7 ha in 2002 which is also recorded as the minimum rainfall in the last 20 years. A sharp rise in the wet area in 2008 (1937 ha) is attributed to good monsoonal rainfall in that year (Patel et al, 2021) after which a continuous decrease is noted irrespective of rainfall trend [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Results and Analysismentioning

confidence: 99%

“…Apart from river dynamics, rainfall variability in this region may have also contributed to the fluctuations in the wetlandscape area. For example, the minimum area in 2002 coincides with the least amount of rainfall in the last 20 years in the Ganga Basin (Patel et al, 2021). Similarly, the largest wetlandscape area for the study period and the revival of the linear wet belt in 2008 are attributed to a good monsoonal rainfall in that year (Patel et al, 2021).…”

Section: Results and Analysismentioning

confidence: 99%

“…For example, the minimum area in 2002 coincides with the least amount of rainfall in the last 20 years in the Ganga Basin (Patel et al, 2021). Similarly, the largest wetlandscape area for the study period and the revival of the linear wet belt in 2008 are attributed to a good monsoonal rainfall in that year (Patel et al, 2021). However, after 2008, the total wet area in the wetlandscape exhibited a continuously decreasing trend (Figure 5) irrespective of the monsoonal rainfall (Patel et al, 2021).…”

Section: Results and Analysismentioning

confidence: 99%

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Wetlandscape (dis)connectivity and fragmentation in a large wetland (Haiderpur) in west Ganga plains, India

Singh

Sinha

Mishra

et al. 2022

Earth Surf Processes Landf

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Wetlands are dynamic ecosystems that require continuous monitoring and assessment of degradation status to design strategies for their sustainable management.While hydrology provides the primary functional control for the wetland ecosystem, the loss of landscape connectivity influences wetland degradation in a major way as it leads to fragmentation. This article aims to integrate hydrogeomorphic and ecological concepts for the assessment of degradation status and its causal factors for a large wetland in the western Ganga plains, India, the Haiderpur, using a wetlandscape approach. We have used a remote-sensing-based approach, which offers a powerful tool for assessing and linking cross-scale structures, functions, and controls in a wetlandscape. The Haiderpur, a Ramsar site since December 2021, is an artificial wetland located on the right bank of the Ganga River wherein the inflows are controlled by a barrage constructed on the Ganga River apart from smaller tributaries flowing in from the north. A novel aspect of this work is the integration of river dynamics and its connectivity to the wetlandscape to understand the spatiotemporal variability in the waterspread area in the wetland. In this work, we have developed an integrated wetlandscape assessment approach by evaluating wetland's geomorphic and hydrological connectivity status for the period 1993-2019 (25 years) across three different spatial scalesregional, catchment, and wetland. We have highlighted the ecological implications of connectivity and patch dynamics for developing sustainable wetland management plans.

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Section: Results and Analysismentioning

confidence: 95%

Section: Results and Analysismentioning

confidence: 99%

Section: Results and Analysismentioning

confidence: 99%

Section: Results and Analysismentioning

confidence: 99%

See 2 more Smart Citations

Wetlandscape (dis)connectivity and fragmentation in a large wetland (Haiderpur) in west Ganga plains, India

Singh

Sinha

Mishra

et al. 2022

Earth Surf Processes Landf

View full text Add to dashboard Cite

show abstract

“…The Sabarmati and upper Ganga‐Brahmaputra basins reeled under compound droughts cumulatively extending over 50 months with a severity score of about 70 in the epoch. The decreasing trend of annual rainfall witnessed in this period (Patel et al ., 2020) could have initiated these concurrent droughts. The tropical basins in the Western coast and southern coast witnessed droughts in the recent decade of 2010–2019.…”

Section: Resultsmentioning

confidence: 99%

Multivariate analysis of concurrent droughts and their effects on Kharif crops—A copula‐based approach

Muthuvel

Mahesha

2021

Intl Journal of Climatology

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Apart from creating an ecological imbalance, drought events could affect an agrarian country's economy and food security by reducing crop yields. The antecedent meteorological droughts could prolong into hydrological and (or) agricultural droughts and may co-exist as concurrent droughts. The current study aims to comprehensively study Indian concurrent droughts, their effects on crop yield, and possible teleconnection with ENSO (El Niño-Southern Oscillation), adopting a copula-based multivariate approach. The copula functions can replicate the correlation among the variables and keep the dependence structure intact. The concurrent drought characteristics are computed using a multivariate standardized drought index that incorporates the three primary drought indices using the Gaussian copula. Some of the severe concurrent drought years such as 2002, 1987, 1972, and 1965 caused considerable yield losses in Kharif season crops of groundnut, millet, and rice. This prompts to construct quad-variate models involving the crop yield and the three drought indices using the vine copulas that perform better than the elliptical and symmetric Archimedean copula. Though the isolated forms of droughts could cause mild yield losses, the probability of concurrent droughts causing high to exceptional losses is more. Further, the ENSO teleconnection with the concurrent monsoon droughts is analysed and mapped. The above-normal warming of the Nino 3.4 region over the tropical Pacific during the months leading up to the monsoon could signal concurrent monsoon droughts in the areas under the Ganga-Brahmaputra basin at a probability of around 45%. These results could be helpful in drought mitigation measures and policymaking.copula, drought, multivariate analysis, vine copula | INTRODUCTIONIn India, 14.5% of people are malnourished, and 37.9% of children under age five are stunted as of 2018 (Priyadarshini and Abhilash, 2020). Sustaining food security in an evergrowing population is one of the challenges posing the developing countries. With the increasing population, urban expansion could sprawl into agricultural farmlands (Abu Hatab et al., 2019). Thus improving the crop yield with advanced farming machinery, pesticides, insecticides, irrigation practices, or sowing high yielding variety seeds become the need of the hour (Sannigrahi et al., 2021). Despite these measures, the inevitable climate extreme events such as extreme precipitation (Alidoost et al., 2019)

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Innovative polygon trend analysis of monthly precipitation (1952–2015) in the Hindukush‐Karakoram‐Himalaya river basins of Pakistan

Ahmed

Lü

Booij

et al. 2022

Intl Journal of Climatology

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The Hindukush-Karakoram-Himalayas (HKH) mountainous range supplies water to 10 river basins serving eight countries. The present study focuses on the river basins located within the HKH region in Pakistan. The modified Soil and Water Assessment Tool (SWAT+) was used to split the research region into 13 subbasins. The Mann-Kendall, Sen's slope, innovative polygon trend analysis (IPTA), and innovative trend analysis (ITA) methods were used for the monthly precipitation time series. The Shyok sub-basin (central Karakoram) experienced rising trends for all seasons, while the southwestern Karakoram (Hunza) showed a rising trend only for the winter. The Hindukush Mountain Range feeds five subbasins (Gilgit, Chitral, Swat, Kabul, and Kurram). The Gilgit and Kurram subbasins observed an upward trend for all seasons. A falling trend in spring and transition from spring (falling) to summer (rising) was observed for the Swat and Kabul sub-basins. The Chitral sub-basin received rising precipitation in spring, summer, and autumn, whereas no trend was observed during winter. In the southern Himalayas (Kanshi and Jhelum), no trend was observed in winter and autumn and a falling trend in spring and summer. The Kunhar sub-basin (southern Himalaya) showed rising trends in winter, spring, and autumn. In contrast, the Soan sub-basin (eastern Himalaya) has no trend in spring, and other seasons show rising trends. The sub-basin Upper Indus experienced a rising trend for autumn, winter, and summer, while a downward trend was observed in spring. The IPTA and ITA approaches are much more sensitive than the Mann-Kendall method in detecting trends. Although the innovative methods are mostly compatible with each other (90%), the IPTA presents additional information about trend transitions between successive parts of the time series. The results presented in this study are an advancement in the investigations made so far in this region and will help to understand the climate and hydrology of this region.

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Rainfall variability over the Indus, Ganga, and Brahmaputra river basins: A spatio-temporal characterisation

Cited by 27 publications

References 99 publications

Wetlandscape (dis)connectivity and fragmentation in a large wetland (Haiderpur) in west Ganga plains, India

Wetlandscape (dis)connectivity and fragmentation in a large wetland (Haiderpur) in west Ganga plains, India

Multivariate analysis of concurrent droughts and their effects on Kharif crops—A copula‐based approach

Innovative polygon trend analysis of monthly precipitation (1952–2015) in the Hindukush‐Karakoram‐Himalaya river basins of Pakistan

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