Regionalization Of Hydrologic Information:
Establishment Of Flow Series At
Ungauged Watersheds
Author(s)
M. M. Portela & A. C. Quintela
Abstract
In previous papers the authors have shown that the mean annual flow expressed
as water depth over the watershed—mean annual flow depth, H —provides an
accurate measure of the temporal variability (within the year and throughout the
years) of the natural flow regime in Portuguese rivers and therefore can be
adopted as a regionalization parameter of hydrologic information. The analysis
then presented focused mainly on the annual and monthly flows, the daily flow
temporal variability having been only briefly mentioned. In this paper the flow
series regionalization subject is more deeply developed, not only at the monthly
level—by including a considerably large number of results—but especially by
presenting new results at the daily level. Additional approaches that confirm the
relationship between the characteristics of the daily flow series and H are
presented and procedures that enable the establishing of mean daily flow series at
ungauged watersheds are included.
Keywords: mean annual flow depth, temporal relative variability of flow series,
hydrologic information regionalization, mean daily flow, ungauged watershed.
1 Introduction: previous works of the authors
Portela and Quintela [1], [2] and [3] showed that the mean annual flow expressed
as water depth over the watershed – mean annual flow depth, H – is closely
related with the relative temporal variability (within the year and among the
years) of the flow regime in Portuguese rivers, providing a powerful parameter
that enables flow regionalization and, therefore, the establishment of flow series
at ungauged watersheds.
Keywords
mean annual flow depth, temporal relative variability of flow series,
hydrologic information regionalization, mean daily flow, ungauged watershed.
Related Book
Other papers in this volume
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