Please use this identifier to cite or link to this item: https://doi.org/10.5194/hess-26-609-2022
DC FieldValue
dc.titleDrastic decline of flood pulse in the Cambodian floodplains (Mekong River and Tonle Sap system)
dc.contributor.authorChua, SDX
dc.contributor.authorLu, XX
dc.contributor.authorOeurng, C
dc.contributor.authorSok, T
dc.contributor.authorGrundy-Warr, C
dc.date.accessioned2022-07-12T09:07:06Z
dc.date.available2022-07-12T09:07:06Z
dc.date.issued2022-02-07
dc.identifier.citationChua, SDX, Lu, XX, Oeurng, C, Sok, T, Grundy-Warr, C (2022-02-07). Drastic decline of flood pulse in the Cambodian floodplains (Mekong River and Tonle Sap system). Hydrology and Earth System Sciences 26 (3) : 609-625. ScholarBank@NUS Repository. https://doi.org/10.5194/hess-26-609-2022
dc.identifier.issn10275606
dc.identifier.issn16077938
dc.identifier.urihttps://scholarbank.nus.edu.sg/handle/10635/228315
dc.description.abstractThe Cambodian floodplains experience a yearly flood pulse that is essential to sustain fisheries and the agricultural calendar. Sixty years of data, from 1960-2019, are used to track the changes to the flood pulse there. We find that minimum water levels over 2010-2019 increased by up to 1.55m at Kratie and maximum water levels decreased by up to 0.79m at Prek Kdam when compared to 1960-1991 levels, causing a reduction of the annual flood extent. Concurrently, the duration of the flooding season has decreased by about 26d (Kampong Cham) and 40d (Chaktomuk), with the season starting later and ending much earlier. Along the Tonle Sap River, the average annual reverse flow from the Mekong to the Tonle Sap Lake has decreased by 56.5%, from 48.7km3 in 1962-1972 to 31.7km3 in 2010-2018. As a result, wet-season water levels at Tonle Sap Lake dropped by 1.05m in 2010-2019 compared to 1996-2009, corresponding to a 20.6% shrinkage of the lake area. We found that upstream contributors such as current hydropower dams cannot fully account for the observed decline in flood pulse. Instead, local anthropogenic causes such as irrigation and channel incision are important drivers. We estimate that water withdrawal in the Cambodian floodplains is occurring at a rate of (2.1 0.3)km3yr-1. Sediment decline and ongoing sand-mining operations have also caused channel erosion. As the flood pulse is essential for the ecological habitats, fisheries and livelihoods of the region, its reduction will have major implications throughout the basin, from the Tonle Sap system to the Vietnamese Mekong Delta downstream.
dc.publisherCopernicus GmbH
dc.sourceElements
dc.typeArticle
dc.date.updated2022-07-10T08:15:15Z
dc.contributor.departmentDEPT OF GEOGRAPHY
dc.description.doi10.5194/hess-26-609-2022
dc.description.sourcetitleHydrology and Earth System Sciences
dc.description.volume26
dc.description.issue3
dc.description.page609-625
dc.published.statePublished
Appears in Collections:Staff Publications
Elements

Show simple item record
Files in This Item:
File Description SizeFormatAccess SettingsVersion 
hess-26-609-2022.pdfAccepted version5.79 MBAdobe PDF

CLOSED

Published

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.