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Impact of climate variability and streamflow alteration on groundwater contribution to the base flow of the Lower Zab River (Iran and Iraq)

Mohammed, Ruqayah and Scholz, Miklas LU (2016) In Environmental Earth Sciences 75(21).
Abstract

Overall water resources evaluations including groundwater contributions to river flow are critical for assessing climate change and drought impacts on basin hydrological responses. By utilising precipitation, daily stream flow and simulated river discharge alteration data, this study introduces a simple but comprehensive methodology to better understand the potential impact of river regulation coupled with climate variability and drought on groundwater involvement. The Lower Zab River basin in northern Iraq has been selected as a representative case study to demonstrate the new methodology. Three of the most commonly used base flow separation methods were assessed: Eckhardt algorithm, flow duration curve and Chapman filtering algorithm.... (More)

Overall water resources evaluations including groundwater contributions to river flow are critical for assessing climate change and drought impacts on basin hydrological responses. By utilising precipitation, daily stream flow and simulated river discharge alteration data, this study introduces a simple but comprehensive methodology to better understand the potential impact of river regulation coupled with climate variability and drought on groundwater involvement. The Lower Zab River basin in northern Iraq has been selected as a representative case study to demonstrate the new methodology. Three of the most commonly used base flow separation methods were assessed: Eckhardt algorithm, flow duration curve and Chapman filtering algorithm. In addition, the indicators of hydrologic alteration method and the reconnaissance drought index have been applied. The results demonstrated that some of the underground water responds to precipitation events. A noticeable increase in groundwater contribution has been observed during the hydrological years between 1998–2001 and 2006–2008 as a result of a sharp decline in the average precipitation. However, the opposite has been observed during the hydrological year 1987, which impacted negatively on the basin water resources availability. The reservoir release through the dry periods causes the observed variations in base flow index (BFI) values between the pre- and post-river damming time periods. Considering the BFI long-term seasonal variation, index values started to rise in April and reached their maximum by the end of June. A steady decline has been recorded between August and September.

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author
organization
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type
Contribution to journal
publication status
published
subject
keywords
Climatology, Environmental assessment, Groundwater contamination and vulnerability, Hydrogeology, Surface water, Water management
in
Environmental Earth Sciences
volume
75
issue
21
publisher
Springer
external identifiers
  • scopus:84992623568
  • wos:000388600900001
ISSN
1866-6280
DOI
10.1007/s12665-016-6205-1
language
English
LU publication?
yes
id
52db2a41-f0fa-47b6-ac3f-c3eb7658c51e
date added to LUP
2016-11-14 10:15:27
date last changed
2017-09-18 11:30:06
@article{52db2a41-f0fa-47b6-ac3f-c3eb7658c51e,
  abstract     = {<p>Overall water resources evaluations including groundwater contributions to river flow are critical for assessing climate change and drought impacts on basin hydrological responses. By utilising precipitation, daily stream flow and simulated river discharge alteration data, this study introduces a simple but comprehensive methodology to better understand the potential impact of river regulation coupled with climate variability and drought on groundwater involvement. The Lower Zab River basin in northern Iraq has been selected as a representative case study to demonstrate the new methodology. Three of the most commonly used base flow separation methods were assessed: Eckhardt algorithm, flow duration curve and Chapman filtering algorithm. In addition, the indicators of hydrologic alteration method and the reconnaissance drought index have been applied. The results demonstrated that some of the underground water responds to precipitation events. A noticeable increase in groundwater contribution has been observed during the hydrological years between 1998–2001 and 2006–2008 as a result of a sharp decline in the average precipitation. However, the opposite has been observed during the hydrological year 1987, which impacted negatively on the basin water resources availability. The reservoir release through the dry periods causes the observed variations in base flow index (BFI) values between the pre- and post-river damming time periods. Considering the BFI long-term seasonal variation, index values started to rise in April and reached their maximum by the end of June. A steady decline has been recorded between August and September.</p>},
  articleno    = {1392},
  author       = {Mohammed, Ruqayah and Scholz, Miklas},
  issn         = {1866-6280},
  keyword      = {Climatology,Environmental assessment,Groundwater contamination and vulnerability,Hydrogeology,Surface water,Water management},
  language     = {eng},
  month        = {11},
  number       = {21},
  publisher    = {Springer},
  series       = {Environmental Earth Sciences},
  title        = {Impact of climate variability and streamflow alteration on groundwater contribution to the base flow of the Lower Zab River (Iran and Iraq)},
  url          = {http://dx.doi.org/10.1007/s12665-016-6205-1},
  volume       = {75},
  year         = {2016},
}