DOI: 10.5194/hess-20-4881-2016
Scopus记录号: 2-s2.0-85006507437
论文题名: Sediment and nutrient budgets are inherently dynamic: Evidence from a long-term study of two subtropical reservoirs
作者: O'Brien K ; R ; , Weber T ; R ; , Leigh C ; , Burford M ; A
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2016
卷: 20, 期: 12 起始页码: 4881
结束页码: 4894
语种: 英语
Scopus关键词: Budget control
; Catchments
; Floods
; Nutrients
; Runoff
; Sediments
; Suspended sediments
; Accurate quantifications
; Catchment modeling
; Intermittent flows
; Long term study
; Nutrient budgets
; Total phosphorus
; Total suspended solids
; Uncertainty and variability
; Reservoirs (water)
; catchment
; flux measurement
; hydrological regime
; long-term change
; nitrogen
; nutrient budget
; phosphorus
; reservoir
; reservoir flooding
; sediment budget
; spatiotemporal analysis
; subtropical region
; suspended load
; Australia
; England
; Lake Wivenhoe
; Queensland
; Somerset
; United Kingdom
英文摘要: Accurate reservoir budgets are important for understanding regional fluxes of sediment and nutrients. Here we present a comprehensive budget of sediment (based on total suspended solids, TSS), total nitrogen (TN) and total phosphorus (TP) for two subtropical reservoirs on rivers with highly intermittent flow regimes. The budget is completed from July 1997 to June 2011 on the Somerset and Wivenhoe reservoirs in southeast Queensland, Australia, using a combination of monitoring data and catchment model predictions. A major flood in January 2011 accounted for more than half of the water entering and leaving both reservoirs in that year, and approximately 30ĝ€% of water delivered to and released from Wivenhoe over the 14-year study period. The flood accounted for an even larger proportion of total TSS and nutrient loads: in Wivenhoe more than one-third of TSS inputs and two-thirds of TSS outputs between 1997 and 2011 occurred during January 2011. During non-flood years, mean historical concentrations provided reasonable estimates of TSS and nutrient loads leaving the reservoirs. Calculating loads from historical mean TSS and TP concentrations during January 2011, however, would have substantially underestimated outputs over the entire study period, by up to a factor of 10. The results have important implications for sediment and nutrient budgets in catchments with highly episodic flow. First, quantifying inputs and outputs during major floods is essential for producing reliable long-term budgets. Second, sediment and nutrient budgets are dynamic, not static. Characterizing uncertainty and variability is therefore just as important for meaningful reservoir budgets as accurate quantification of loads. © Author(s) 2016. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78669
Appears in Collections: 气候变化事实与影响
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作者单位: School of Chemical Engineering, University of Queensland, St Lucia, QLD, Australia; Integrated Catchment Assessment and Management Unit, ANU College of Medicine, Biology and Environment, Australian National University, Canberra, ACT, Australia; Australian Rivers Institute, Griffith University, Nathan, QLD, Australia; Griffith School of Environment, Griffith University, Nathan, QLD, Australia; IRSTEA, UR-MALY, 5 rue de la Doua, Villeurbanne, Cedex, France
Recommended Citation:
O'Brien K,R,, Weber T,et al. Sediment and nutrient budgets are inherently dynamic: Evidence from a long-term study of two subtropical reservoirs[J]. Hydrology and Earth System Sciences,2016-01-01,20(12)