Advancing understanding of development policy impacts on transboundary river basins: Integrated watershed modelling of the Lower Mekong Basin.

dc.contributor.advisor Metternicht, Graciela
dc.contributor.advisor Marshall, Lucy Ly, Kongmeng 2022-01-11T06:17:31Z 2022-01-11T06:17:31Z 2021
dc.description.abstract The management of transboundary river basins across developing countries, such as the Lower Mekong River Basin (LMB), is frequently challenging given the development and conservation divergences of the basin countries. Driven by needs to sustain economic performance and reduce poverty, the LMB countries are embarking on significant land use changes in the form hydropower dams, to fulfill their energy requirements. This pathway could lead to irreversible changes to the ecosystem of the Mekong River, if not properly managed. This thesis aims to explore the potential effects of changes in land use —with a focus on current and projected hydropower operations— on the Lower Mekong River network streamflow and instream water quality. To achieve this aim, this thesis first examined the relationships between the basin land use/land cover attributes, and streamflow and instream water quality dynamics of the Mekong River, using total suspended solids and nitrate as proxies for water quality. Findings from this allowed framing challenges of integrated water management of transboundary river basins. These were used as criteria for selecting eWater’s Source modelling framework as a management tool that can support decision-making in the socio-ecological context of the LMB. Against a combination of predictive performance metrics and hydrologic signatures, the model’s application in the LMB was found to robustly simulate streamflow, TSS and nitrate time series. The model was then used for analysing four plausible future hydropower development scenarios, under extreme climate conditions and operational alternatives. This revealed that hydropower operations on either tributary or mainstream could result in annual and wet season flow reduction while increasing dry season flows compared to a baseline scenario. Conversely, hydropower operation on both tributary and mainstream could result in dry season flow reduction. Both instream TSS and nitrate loads were predicted to reduce under all three scenarios compared to the baseline. These effects were found to magnify under extreme climate conditions, but were less severe under improved operational alternatives. In the LMB where hydropower development is inevitable, findings from this thesis provide an enhanced understanding on the importance of operational alternatives as an effective transboundary cooperation and management pathway for balancing electricity generation and protection of riverine ecology, water and food security, and people livelihoods.
dc.language English
dc.language.iso en
dc.publisher UNSW, Sydney
dc.rights CC BY 4.0
dc.subject.other Transboundary river basin management
dc.subject.other Lower Mekong River Basin
dc.subject.other Mekong River
dc.subject.other Lao PDR
dc.subject.other Viet Nam
dc.subject.other Cambodia
dc.subject.other Thailand
dc.subject.other Mekong River Commission
dc.subject.other Hydrological simulation
dc.subject.other Watershed models
dc.subject.other nutrients
dc.subject.other total suspended solids
dc.subject.other eWater's Source Model
dc.subject.other Hydropoower Development Scenario
dc.subject.other Transboundary water governance
dc.title Advancing understanding of development policy impacts on transboundary river basins: Integrated watershed modelling of the Lower Mekong Basin.
dc.type Thesis
dcterms.accessRights open access
dcterms.rightsHolder Ly, Kongmeng
dspace.entity.type Publication
unsw.relation.faculty Science
unsw.relation.faculty Engineering School of Biological, Earth & Environmental Sciences School of Civil and Environmental Engineering School of Biological, Earth & Environmental Sciences
unsw.subject.fieldofresearchcode 4104 Environmental management
unsw.subject.fieldofresearchcode 37 EARTH SCIENCES
unsw.subject.fieldofresearchcode 41 ENVIRONMENTAL SCIENCES
unsw.thesis.degreetype PhD Doctorate
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