Crop evapotranspiration dynamics in the Ganges and Mekong deltas

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cg.contributor.affiliationInternational Water Management Instituteen_US
cg.contributor.donorCGIAR Trust Funden_US
cg.contributor.initiativeAsian Mega-Deltasen_US
cg.coverage.regionSouthern Asiaen_US
cg.coverage.regionSouth-eastern Asiaen_US
cg.creator.identifierkarthikeyan matheswaran: 0000-0001-7377-0629en_US
cg.creator.identifierMahesh Jampani: 0000-0002-8925-719Xen_US
cg.creator.identifierD R SENA: 0000-0003-4683-4687en_US
cg.identifier.iwmilibraryH053409en_US
cg.identifier.projectIWMI - C-0019en_US
cg.identifier.urlhttps://agu.confex.com/agu/agu24/meetingapp.cgi/Paper/1610484en_US
cg.reviewStatusPeer Reviewen_US
dc.contributor.authorMatheswaran, Karthikeyanen_US
dc.contributor.authorPuvanenthirarajah, Suvasthighaen_US
dc.contributor.authorJampani, Maheshen_US
dc.contributor.authorSena, Dipaka Ranjanen_US
dc.date.accessioned2025-01-14T06:07:08Zen_US
dc.date.available2025-01-14T06:07:08Zen_US
dc.identifier.urihttps://hdl.handle.net/10568/168946en_US
dc.titleCrop evapotranspiration dynamics in the Ganges and Mekong deltasen_US
dcterms.abstractAsian Mega Deltas (AMD) are food baskets providing livelihoods for farmers and food security for millions. In recent years, many countries have been facing significant pressures to balance sustainable resource use and confront climate change impacts and increasing demands from population growth. In the Ganges and Mekong Deltas, these imminent challenges and anthropogenic pressures are more severe due to increasing pressure to enhance the productive use of land and water resources. The growing variability in water availability is caused by climate change and decreased freshwater flows from upstream. Continuous estimates of evapotranspiration (ET) are essential for evaluating the productivity of agriculture areas in these deltas, but these estimates are often not readily available. In this study, we derived monthly ET in the Ganges and Mekong deltas using remote sensing-based data and an energy balance model to assess its trends. We used the Google Earth Engine (GEE) version of the Surface Energy Balance Algorithm for Land (SEBAL) model with inputs from ERA5 Land meteorological data and LANDSAT 8 and 9 satellite images covering the period from 2014 to 2024. Due to heavy cloud cover during the monsoon season, a gap-filling process was used to produce seamless monthly ET estimates for these two deltas. The ET estimates were aggregated based on land cover types to determine trends in agricultural water use during both the monsoon and non-monsoon seasons. In areas where information about the crop types is available, like in the Mekong Delta, the ET estimates were further aggregated for specific main crop types. Initial results showed an increasing trend in ET at the regional level, indicating intensified agricultural activities within the two assessed deltas. The ET estimates produced from our study will serve as a basis for evaluating the land and water productivity of the deltas, demonstrating the scalability of remote sensing data and energy-based models in estimating ET fluxes at various scales and assessing their trends in different land cover areas.en_US
dcterms.accessRightsOpen Accessen_US
dcterms.bibliographicCitationMatheswaran, Karthikeyan; Puvanenthirarajah, Suvasthigha; Jampani, Mahesh; Sena, Dipaka Ranjan. 2024. Crop evapotranspiration dynamics in the Ganges and Mekong deltas [Abstract only]. Paper presented at the American Geophysical Union Annual Meeting 2024 (AGU24) on What’s Next for Science, Washington, DC, USA, 9-13 December 2024. 1p.en_US
dcterms.extent1p.en_US
dcterms.issued2024-12-09en_US
dcterms.languageenen_US
dcterms.licenseCopyrighted; all rights reserveden_US
dcterms.subjectcropsen_US
dcterms.subjectevapotranspirationen_US
dcterms.subjectdeltasen_US
dcterms.typeAbstracten_US

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