DOI: 10.1016/j.jhydrol.2020.124714
论文题名: Long-term surface water trends and relationship with open water evaporation losses in the Namoi catchment, Australia
作者: Fuentes I. ; van Ogtrop F. ; Vervoort R.W.
刊名: Journal of Hydrology
ISSN: 221694
出版年: 2020
卷: 584 语种: 英语
英文关键词: Climatic trends
; Evaporation losses
; Surface water
Scopus关键词: Catchments
; Climate change
; Evaporation
; Runoff
; Surface water resources
; Surface waters
; Agricultural catchments
; Climate variables
; Climatic trends
; Economic pressures
; Evaporation loss
; Hydrologic cycles
; Reference evapotranspiration
; Supervised classification
; Evapotranspiration
; catchment
; climate change
; data set
; evaporation
; hydrological cycle
; Landsat
; long-term change
; natural resource
; open water
; Penman-Monteith equation
; satellite imagery
; supervised classification
; surface water
; trend analysis
; Australia
; Namoi Basin
; New South Wales
英文摘要: Economic pressures on natural resources have led to a modification of natural surface water patterns. This has affected the hydrologic cycle at a global scale with multiple environmental and socioeconomic implications. This study evaluates long-term trends in surface water occurrence and related climate variables in a large agricultural catchment of Australia to understand trends in evaporative water losses from open water bodies. Surface water detection was based on a supervised classification of Landsat images between 1988 and 2018 to obtain inundation and surface water frequencies across the catchment, which were compared with other surface water products. Climate trends were based on monthly SILO gridded datasets. Open water evaporation was estimated using the FAO56 methodology and compared with the Penman-Monteith-Leuning Evapotranspiration V2 (PML_V2) product. Evaporation trends were analysed using the Mann Kendall (MK) test and the Sen's slope (SS). Generally, open water frequencies showed significant negative trends, though these varied spatially. The number of dams, on the other hand, had an increasing trend. Temperatures are increasing in the catchment, while rainfall and relative humidity are decreasing, resulting in an overall positive trend for reference evapotranspiration (ETr) across 90% of the catchment. Even though ETr and evaporation per unit area of water show positive trends, lumped open water evaporation showed a negative trend, possibly associated with an average decrease in surface water frequencies. Annual evaporative losses averaged 201.9 GL, exceeding annual total account usage of surface water in the catchment. All the studied changes imply a loss of blue and green water in the catchment, and provide evidence of an overall intensification of the hydrologic cycle as predicted under climate change. © 2020 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/158290
Appears in Collections: 气候变化与战略
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作者单位: Sydney Institute of Agriculture, School of Life and Environmental Sciences, The University of Sydney, Sydney, 2006, Australia
Recommended Citation:
Fuentes I.,van Ogtrop F.,Vervoort R.W.. Long-term surface water trends and relationship with open water evaporation losses in the Namoi catchment, Australia[J]. Journal of Hydrology,2020-01-01,584