Low-flow estimates in regions of extrapolation of the regionalization equations: a new concept

Pruski, Fernando Falco; Rodríguez, Ricardo A.; Nunes, Aline de Araújo; Pruski, Pedro Lopes; Singh, Vijay P.

doi:10.1590/1809-4430-eng.agric.v35n5p808-816/2015

Cited by 13 publications

(9 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Similar results were found for low flows in RODRIGUEZ (2008), PRUSKI et al (2012) and PRUSKI et al (2015). Although the qlt and C values tend to increase toward the headwaters, there is no guarantee that this trend of growth is as pronounced as that represented in the graphs of C versus drainage area (Figure 2) and in the qlt variation rate expressed by equation 6.…”

Section: Resultssupporting

confidence: 76%

See 1 more Smart Citation

Extrapolation of regionalization equations for long-term average flow

et al. 2016

Self Cite

View full text Add to dashboard Cite

Knowledge about long-term average flow is essential for planning and managing water resources because it represents the potential water availability. One technique used to determine streamflow is regionalization, but because most gauge stations normally are associated with large drainage areas, the extrapolation of regionalization equations does not accurately represent the water availability; therefore, this method is not recommended. The main objective of the present paper is to propose a new method of estimating water availability that minimizes the risks of extrapolating regionalization equations for long-term average flow. The method is based on the use of a threshold value of the runoff coefficient to obtain the long-term average flow at the positions of the basin where the runoff coefficient estimated by the regionalization equation exceeds the threshold value. It was found that values of the runoff coefficient estimated average flows greater than twice those of the threshold values. The use of this method allows a reliable estimation for long-term average flows in regions of extrapolation without compromising the security of the available water supply.KEY WORDS: water availability, planning and management of water resources, water safety.

show abstract

Section: Resultssupporting

confidence: 76%

“…Although there are no similar studies available for the long-term average flow, equivalent results were observed by PRUSKI et al (2015) when analyzing the performance for low flows. These authors showed that it was necessary to adjust 88% of the total Urucuia basin (a sub-basin of São Francisco basin) area using a threshold value.…”

Section: Resultsmentioning

confidence: 62%

Extrapolation of regionalization equations for long-term average flow

et al. 2016

Self Cite

View full text Add to dashboard Cite

show abstract

“…This technique is a downscale of discharge for drainage areas smaller than the available measurements, using empirical equations based on independent variables like area upstream or average precipitation upstream. These authors tested several empirical relationships, and the best skill low streamflow regionalization was obtained by basin-specific regression equations of Q 90 against the upstream long-term annual rainfall minus an initial abstraction of 750 mm (P eq750 = P − 750) as independent variable [29]. Figure 11 plots 80% of long-term Q 90 (the maximum discharge that could be granted for all human use, including irrigation).…”

Section: Regionmentioning

confidence: 99%

Climate Change and Intense Irrigation Growth in Western Bahia, Brazil: The Urgent Need for Hydroclimatic Monitoring

Pousa

Costa

Pimenta

et al. 2019

Water

View full text Add to dashboard Cite

In Western Bahia, one of the most active agricultural frontiers of the world, cropland area and irrigated area are increasing at fast rates, and water conflicts have been happening at least since 2010. This study makes a hydroclimatic analysis of the water resources in Western Bahia, from both supply and demand viewpoints. Time series of precipitation for the period 1980–2015 and river discharge for the period 1978–2015 are analyzed, indicating a significant reduction of up to 12% in rainfall since the 1980s, and a reduction in river discharge in all stations studied, in both the rainy season and the dry season. Combined with that, irrigated area has increased over 150-fold in 30 years, and in the most irrigated regions, has increased by 90% in the last eight years only. Seven regions in Western Bahia have been identified where the potential for water use conflicts is critical. Moreover, the combination of reduced availability and increased demand of water resources indicates that, if current trends are maintained, conflicts over water may become more frequent in the next years or decades. A short-term alternative to avoid such conflicts is to largely avoid irrigation during the months with low discharge. However, a monitoring system in which the availability and demand of water resources for irrigation are actually measured and monitored, is the safest path to provide water security to this region.

show abstract

“…Whereas there exist sites under long-term observation (so that low flow characteristics can be estimated with the use of direct -statistical methods) still, in many cases streamflow information is not available or is insufficient in terms of quality and quantity (Pruski et al, 2015;Arai et al, 2012). A lot of effort was made to establish low flow procedures and to evaluate methods for the estimation of low flow parameters at ungauged sites (Schreiber and Demuth, 1997).…”

Section: Introductionmentioning

confidence: 99%

Regionalization Methods for Low Flow Estimation in Ungauged Catchments – A Review

Cupak¹

2020

Acta Sci. Pol., Formatio Circumiectus

View full text Add to dashboard Cite

Aim of the study The purpose of the paper is to look at the topic of estimation of the low flow characteristics at ungauged catchments in a balanced and systematic way, to provide a recent documentation of the subject and trace the most recent trends in low flow regionalization. The review focuses on methods, which are based on diverse methods that is the statistical, seasonal approach which are commonly used for the estimation of low flow characteristics in ungauged sites and which can be adopted in Polish conditions. Material and methods The paper examines the variety of literature sources published primarily during the last two decades. The most popular approaches to regionalization of watersheds are described: methods of residuals pattern approach, multivariate statistics such as cluster analysis, Classification and Regression Tree (CART) models or seasonality of low flows. Results and conclusions The described regional regression approach for low flow estimation in ungauged catchments, which correlates low flow indices and catchment characteristics, is the most widely used method. The methods were chosen because they differ in terms of methodological approach to using statistical methods. Also, the methods described in the article are "universal", which means that they can be adopted for different regions, countries, including Poland; they are interdisciplinary, and can be adopted for low flow calculation as well as average or flood flows.

show abstract

Low-flow estimates in regions of extrapolation of the regionalization equations: a new concept

Cited by 13 publications

References 14 publications

Extrapolation of regionalization equations for long-term average flow

Extrapolation of regionalization equations for long-term average flow

Climate Change and Intense Irrigation Growth in Western Bahia, Brazil: The Urgent Need for Hydroclimatic Monitoring

Regionalization Methods for Low Flow Estimation in Ungauged Catchments – A Review

Contact Info

Product

Resources

About