A statistical, parsimonious, empirical framework for regional flow duration curve shape prediction in high permeability Mediterranean region

作者：Longobardi Antonia^*; Villani Paolo

来源：Journal of Hydrology, 2013, 507: 174-185.

DOI：10.1016/j.jhydrol.2013.10.019

• Flow duration curve
• BFI
• Low flow indices
• Regionalization methods
• High permeability areas

The flow duration curve (FDC) can provide information about the integral catchment response to rainfall events that span from low volume events to events of flood magnitude, and the FDC is particularly useful for low flow regime characterization. The focus of this study was to introduce a statistical, parsimonious approach with a conceptually based parameterization that can lead to simple and practical tools for FDC predictions that can be applied to contexts, such as the Mediterranean climate, that involve scarce data and regional geological and hydro-geological features that strongly affect low-flow hydrological regimes. At-site, dimensionless, empirical FDCs were represented with three-parameter log normal distributions, the variations in the corresponding parameters versus the base flow index (BFI) were explored, and the conceptual relationship of these parameters is further discussed. In cases of ungauged catchments for which the BFI is not known, a priori estimates of such indices can be derived from permeability indices, as BFIs are strongly related to permeability indices in the studied region (Longobardi and Villani, 2008). For moderate to large permeability catchments, which represent the largest fraction of the investigated catchments, prediction errors associated with the proposed regional method of FDC assessment, which is particularly suited for regions for which only scarce or poor data are available, averaged approximately 18%.

• 出版日期2013-12-12