Assessing Climate Change Impacts on River Flows in the Tonle Sap Lake Basin, Cambodia

Type of content
Journal Article
Thesis discipline
Degree name
Publisher
MDPI AG
Journal Title
Journal ISSN
Volume Title
Language
English
Date
2019
Authors
Oeurng C
Cochrane T
Chung S
Kondolf M
Piman T
Arias M
Abstract

The Tonle Sap is the most fertile and diverse freshwater ecosystem in Southeast Asia, receiving nurturing water flows from the Mekong and its immediate basin. In addition to rapid development in the Tonle Sap basin, climate change may threaten natural flow patterns that sustain its diversity. The impacts of climate change on river flows in 11 sub-basins contributing to the Tonle Sap Lake were assessed using the Soil and Water Assessment Tool (SWAT) model to quantify the potential magnitude of future hydrological alterations. Projected river flows from three General Circulation Models (GFDL-CM3, GISS-E2-R-CC and IPSL-CM5A-MR) for three time horizons (2030s, 2060s and 2090s) indicate a likely decrease in both the wet and dry season flows. The mean annual projected flow reductions range from 9 to 29%, 10 to 35% and 7 to 41% for the 2030s, 2060s and 2090s projections, respectively. Moreover, a decrease in extreme river flows (Q5 and Q95) was also found, which implies there could be a decline in flood magnitudes and an increase in drought occurrences throughout the basin. The results of this study provide insight for water resources planning and adaptation strategies for the river ecosystems during the dry season, when water flows are projected to decrease.

Description
Citation
Oeurng C, Cochrane T, Chung S, Kondolf M, Piman T, Arias M Assessing Climate Change Impacts on River Flows in the Tonle Sap Lake Basin, Cambodia. Water. 11(3). 618-618.
Keywords
climate change, river flow, Tonle Sap, SWAT model, Lower Mekong
Ngā upoko tukutuku/Māori subject headings
ANZSRC fields of research
Field of Research::05 - Environmental Sciences::0501 - Ecological Applications::050101 - Ecological Impacts of Climate Change
Fields of Research::31 - Biological sciences::3103 - Ecology::310304 - Freshwater ecology
Rights
© 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).