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Impact of Evapotranspiration Formulations at Various Elevations on the Reconnaissance Drought Index

Mohammed, Ruqayah and Scholz, Miklas LU (2017) In Water Resources Management 31(1). p.531-548
Abstract

Numerous drought indices with various intricacy have been utilised in several climatic regions. Presently, the reconnaissance drought index (RDI), which is considered as a powerful index of meteorological drought, is acquisitioning approval primarily in semi-arid and arid climatologic areas. Because RDI is based on precipitation (P) and evapotranspiration (ET), it assesses the ET estimation effects on the characterisation of drought severity computed by RDI. The current study sheds light on the impact of the ET methods, and the elevation and climate conditions on the RDI annual results, (particularly, the alpha form of the index (RDIα12)), using three of the most widespread experimental ET estimates with low data... (More)

Numerous drought indices with various intricacy have been utilised in several climatic regions. Presently, the reconnaissance drought index (RDI), which is considered as a powerful index of meteorological drought, is acquisitioning approval primarily in semi-arid and arid climatologic areas. Because RDI is based on precipitation (P) and evapotranspiration (ET), it assesses the ET estimation effects on the characterisation of drought severity computed by RDI. The current study sheds light on the impact of the ET methods, and the elevation and climate conditions on the RDI annual results, (particularly, the alpha form of the index (RDIα12)), using three of the most widespread experimental ET estimates with low data requirements. These techniques are known as Thornthwaite, Hargreaves, and Blaney-Criddle, and are utilised in addition to the Food and Agriculture Organization Penman-Monteith reference technique. Data from 24 stations for the period from 1979 to 2014 cover different elevations and climatic conditions. No significant (P > 0.05) impacts on both the standardised (RDIst) and normalised (RDIn) forms of the RDI were detected by applying the considered ET methods at various elevations for various climatic conditions. However, the RDIα12 is directly influenced with a significant (P < 0.05) deviation that has been observed by various ET methods at different elevations and climate conditions. Accordingly, consideration should be paid to the ET estimation methodologies, in particular at high elevations. The use of various approaches may lead to flaws in availability of water resources and water quality forecasts.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Agriculture, Aridity evaluation, Elevation indicator, Irrigation, Penman-Monteith, Water resources management
in
Water Resources Management
volume
31
issue
1
pages
18 pages
publisher
Springer
external identifiers
  • scopus:84996523788
  • wos:000393777100033
ISSN
0920-4741
DOI
10.1007/s11269-016-1546-9
language
English
LU publication?
yes
id
e1ec6ad7-8a0d-4b75-b699-0b0c02afb9d9
date added to LUP
2016-12-12 08:19:46
date last changed
2018-02-18 04:54:53
@article{e1ec6ad7-8a0d-4b75-b699-0b0c02afb9d9,
  abstract     = {<p>Numerous drought indices with various intricacy have been utilised in several climatic regions. Presently, the reconnaissance drought index (RDI), which is considered as a powerful index of meteorological drought, is acquisitioning approval primarily in semi-arid and arid climatologic areas. Because RDI is based on precipitation (P) and evapotranspiration (ET), it assesses the ET estimation effects on the characterisation of drought severity computed by RDI. The current study sheds light on the impact of the ET methods, and the elevation and climate conditions on the RDI annual results, (particularly, the alpha form of the index (RDI<sub>α12</sub>)), using three of the most widespread experimental ET estimates with low data requirements. These techniques are known as Thornthwaite, Hargreaves, and Blaney-Criddle, and are utilised in addition to the Food and Agriculture Organization Penman-Monteith reference technique. Data from 24 stations for the period from 1979 to 2014 cover different elevations and climatic conditions. No significant (P &gt; 0.05) impacts on both the standardised (RDI<sub>st</sub>) and normalised (RDI<sub>n</sub>) forms of the RDI were detected by applying the considered ET methods at various elevations for various climatic conditions. However, the RDI<sub>α12</sub> is directly influenced with a significant (P &lt; 0.05) deviation that has been observed by various ET methods at different elevations and climate conditions. Accordingly, consideration should be paid to the ET estimation methodologies, in particular at high elevations. The use of various approaches may lead to flaws in availability of water resources and water quality forecasts.</p>},
  author       = {Mohammed, Ruqayah and Scholz, Miklas},
  issn         = {0920-4741},
  keyword      = {Agriculture,Aridity evaluation,Elevation indicator,Irrigation,Penman-Monteith,Water resources management},
  language     = {eng},
  number       = {1},
  pages        = {531--548},
  publisher    = {Springer},
  series       = {Water Resources Management},
  title        = {Impact of Evapotranspiration Formulations at Various Elevations on the Reconnaissance Drought Index},
  url          = {http://dx.doi.org/10.1007/s11269-016-1546-9},
  volume       = {31},
  year         = {2017},
}