Regional flow duration curve estimation in small ungauged catchments using instantaneous flow measurements and a censored data approach

Niadas, Ioannis A.

doi:10.1016/j.jhydrol.2005.03.009

Cited by 32 publications

(27 citation statements)

References 15 publications

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“…More reliable synthetic FDCs may be attainable if a larger sample of study catchments could be identified. Alternative approaches should also be investigated where regression equations are used to derive parameters of mathematical or probabilistic FDC models (e.g., Niadas, 2005;Castellarin et al, 2007). …”

Section: Resultsmentioning

confidence: 99%

“…A common regionalisation methodology describes the FDC in terms of a mathematical model and then relates the parameters of the model to catchment morphological and/or climatic variables using regression analysis (Niadas, 2005;Viola et al, 2011). Probabilistic models can be used to describe the FDC and regression models developed to estimate the parameters of the distribution (Castellarin et al, 2007) Assumptions regarding models that describe the form of FDCs can be avoided by developing regional regression equations to predict the selected percentile flows (e.g., flows for exceedance percentages 5%, 10%, 20%, ...95%).…”

Section: Introductionmentioning

confidence: 99%

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Synthetic monthly flow duration curves for the Cape Floristic Region, South Africa

Hope

Bart

2012

WSA

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A flow duration curve (FDC) provides a valuable planning and management tool since it describes the entire flow regime of a river. Water resource planning in South Africa is often based on monthly river flow data and synthetic FDCs are required for applications in ungauged catchments. The objective of this study was to derive 11 monthly FDC percentile flows and the mean annual flow (MAQ) for catchments in the Cape Floristic Region of South Africa using regression equations with readily measureable catchment variables, including vegetation indices from Moderate Resolution Imaging Spectrometer (MODIS) satellite imagery. An 'all-models' approach with 10-fold validation was adopted to identify the 'best' regression models. Predictions of percentile flows above the median flow and MAQ were generally good but poor for low flows. Overall predictive uncertainty had a tendency to be larger in drier catchments. The most important predictive variables were catchment mean annual precipitation, physiography and soils. MODIS vegetation indices were significant predictors in equations for 6 percentile flows and MAQ, and predictive uncertainty increased if the MODIS indices were excluded from model development. The regression approach implemented in this study may be appropriate for other regionalisation studies that are based on a small sample of gauged catchments.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthetic monthly flow duration curves for the Cape Floristic Region, South Africa

Hope

Bart

2012

WSA

View full text Add to dashboard Cite

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“…In this context, one approach has been to cluster catchments into classes with similar physiographic and climatic characteristics, and then to estimate dimensionless (non-parametric) FDCs for gauged basins which in turn are then applied to ungauged basins (Niadas, 2005;Ganora et al, 2009). One such example is the work of Pugliese et al (2014) who applied top-kriging to predict the empirical FDC in ungauged catchments.…”

Section: Introductionmentioning

confidence: 99%

The soil water characteristic as new class of closed-form parametric expressions for the flow duration curve

Sadegh

Vrugt

Gupta

et al. 2016

Journal of Hydrology

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Keywords:Closed-form expression for FDC Soil water characteristic Regionalization of FDC s u m m a r yThe flow duration curve is a signature catchment characteristic that depicts graphically the relationship between the exceedance probability of streamflow and its magnitude. This curve is relatively easy to create and interpret, and is used widely for hydrologic analysis, water quality management, and the design of hydroelectric power plants (among others). Several mathematical expressions have been proposed to mimic the FDC. Yet, these efforts have not been particularly successful, in large part because available functions are not flexible enough to portray accurately the functional shape of the FDC for a large range of catchments and contrasting hydrologic behaviors. Here, we extend the work of Vrugt and Sadegh (2013) and introduce several commonly used models of the soil water characteristic as new class of closed-form parametric expressions for the flow duration curve. These soil water retention functions are relatively simple to use, contain between two to three parameters, and mimic closely the empirical FDCs of 430 catchments of the MOPEX data set. We then relate the calibrated parameter values of these models to physical and climatological characteristics of the watershed using multivariate linear regression analysis, and evaluate the regionalization potential of our proposed models against those of the literature. If quality of fit is of main importance then the 3-parameter van Genuchten model is preferred, whereas the 2-parameter lognormal, 3-parameter GEV and generalized Pareto models show greater promise for regionalization.

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“…Often these studies regard large catchments with perennial streamflows, as Canada (Leboutillier and Waylen, 1993), India (Singh et al, 2001), Italy (Castellarin et al, 2007Castellarin et al, 2004;Franchini and Suppo, 1996;Iacobellis, 2008;Ganora et al, 2009), Greece (Niadas, 2005), Taiwan (Yu et al, 2002), Philippines (Quimpo et al, 1983), South Africa (Smakhtin et al, 1997) and United States (Fennessey and Vogel, 1990). It is important to point out that analysis of FDC for small catchments with ephemeral streamflows, as in Portugal (Croker et al, 2003) are less frequent than studies for perennial streamflows.…”

Section: Introductionmentioning

confidence: 99%

Regional flow duration curves for ungauged sites in Sicily

Viola

Noto

Cannarozzo

et al. 2011

Hydrol. Earth Syst. Sci.

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Abstract. Flow duration curves are simple and powerful tools to deal with many hydrological and environmental problems related to water quality assessment, water-use assessment and water allocation. Unfortunately the scarcity of streamflow data enables the use of these instruments only for gauged basins. A regional model is developed here for estimating flow duration curves at ungauged basins in Sicily, Italy. Due to the complex ephemeral behavior of the examined region, this study distinguishes dry periods, when flows are zero, from wet periods using a three parameters power law to describe the frequency distribution of flows. A large dataset of streamflows has been analyzed and the parameters of flow duration curves have been derived for about fifty basins. Regional regression equations have been developed to derive flow duration curves starting from morphological basin characteristics.

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Regional flow duration curve estimation in small ungauged catchments using instantaneous flow measurements and a censored data approach

Cited by 32 publications

References 15 publications

Synthetic monthly flow duration curves for the Cape Floristic Region, South Africa

Synthetic monthly flow duration curves for the Cape Floristic Region, South Africa

The soil water characteristic as new class of closed-form parametric expressions for the flow duration curve

Regional flow duration curves for ungauged sites in Sicily

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