جغرافیا و آمایش شهری منطقهای (Sep 2012)
Study the qualitative and quantitative condition of the groundwater resources (Case Study: Jovain Plain, Khorasan Razavi Province)
Abstract
Water shortage is one of the most important environmental challenges in arid and semiarid regions. Unfortunately, today, due to low precipitation and over pumping of groundwater resources in recent years and also lack of attention to aquifer and artificial feeding; therefore more attention to ground water resources is an inevitable and important issue. The review of quantitative and qualitative situation of the underground water tables is of such issues which shall be considered. In this study, the qualitative and quantitative variations of the groundwater water tables have been investigated for feeding and discharge in some pizometers of Jovain prolific plains in south Khorasan province. Firstly, the data statistics of hydro static levels at 50 pizometers as quantitative and at sixty pizometers as qualitative were prepared as selected pizometers and sufficiency and homogenous tests of the data were performed. Then the imperfect data were reconstructed and finally the data were extracted and analyzed in 12 years common statistics base of 1995-2007. The aim of this paper is to determine the qualitative and quantitative maps of underground waters based on the variables of hydrostatic levels through inverse distance interpolation method (ID) by the use of GIS system (Geographical Information System). So that, based on the results of mapping Annual Groundwater Unit Hydrograph (AGUH) of Jovain province, on average the water ground level from years of 1995 to 1999 up to aqueous year 2006-2007 shows a drop of 10 m. Also the Annual Groundwater Unit Hydrograph (AGUH) of Jovain plain and three periods of diverse drop of hydrostatic level from years 1995 up to 1998 from 53.07 to 54.09m shows approximately a normal drop status. But from statistical year 1998 on ward up to year 2003, the drop has reached from 53.07 to 54.09 m, that is 4.5 m of drop during four aqueous years. With respect to the obtained results of analysis of quantitative and qualitative results by Inverse Distance Interpolation Method (ID) and mapping qualitative and iso- drop maps , the interpolated qualitative parameters are critical in some areas and show a drastic decrease of quality of this aquifer.
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