trend analysis of groundwater quality using coherence and cross wavelet (case study of khorramabad city)

trend analysis of groundwater quality using coherence and cross wavelet (case study of khorramabad city)

today, monitoring groundwater quality and the trend of its changes for drinking, industrial and agricultural uses is very important for the general health of society. due to changes in groundwater quality that can be due  to  climatic  or  human  factors,  it  is  necessary  to  consider  and  study  these  resources  to  maintain  their quality.

the  purpose  of  this  study  is  to  investigate  the  quality  and  effective  factors  in  groundwater  quality changes in khorramabad from 2005 to 2018 using the global water quality index (wqi) and coherence and cross  wavelet.  to  achieve  this  goal,  first,  the  drought  assessment  of  khorramabad  city  has  been  studied according to precipitation data using the index (spi).

then, using the world water quality index (wqi), the groundwater quality of khorramabad has been studied. the results showed that the quality of groundwater in khorramabad during the  years 2005 to  2018  was  in  standard condition. also, the correlation between the chemical  parameters  of  groundwater  has  been  evaluated.

 the  results  of coherence and  cross  wavelet showed that the relative effect of precipitation  with  a  wavelet coherence coefficient  of 0.5 had  been more compared to other factors in changes in groundwater quality in khorramabad city. therefore, it can be said that the relative impact of climatic factors on changes in groundwater quality in khorramabad has been more than the other factors.

accordingly, appropriate management strategies for groundwater quality resources and mitigation solutions are imperatively needed to ensure the sustainability of the groundwater resource and the protection of public health in khorramabad city.