Abstract
Uncontrolled exploitation of groundwater in many parts of the world has led to a sharp drop in groundwater levels. In this study, changes in Ardabil plain groundwater level were studied using geographic information system (GIS). For this purpose, the interpolation table method was used, the intrinsic data as table data of piezo metric wells was used. In order to implement the model, the Majol Geoestatical in geographic information system software was used. The data entered as regions into the geographic information system, and then done for the entire zoning area, due to zoning 8 models, the IDW, GPI, RBF, LPI, KO, KS, KU and EBK in geostatical extension were evaluated. The ordinary kriging method (KO) with the lowest RMSE, was determined as the most accurate one, and finally, as the ultimate method for zoning and map providing for the changes in groundwater levels drop of the region. The results of classification showed that the biggest drop of about 40 meters was in the areas close to the southeastern parts of the study region and in other areas, little changes were observed, this rate of the change and decline in some parts of the desert like southern regions is very tangible and specified .
Highlights
The provided statistics by the world resources illustrate a dilemma in the trend of annual drop in the ground water
Akbari et al (1388) conducted research to assess the groundwater levels drop of Mashhad plain, the statistics of 70 observed wells during 2 periods of 10 years (76 in 1366 and 87 in 1377) examined, and the results showed that during 20 years, the rate of 1.12 m, and it means that averagely every year 60 cm water level has been reduced
Irregular and incorrect exploitations of groundwater caused a drop in groundwater levels and in some cases, caused the groundwater aquifers to be dried in some parts of the country
Summary
The provided statistics by the world resources illustrate a dilemma in the trend of annual drop in the ground water. Within the recent years in Ardabil desert uncontrolled exploitation has caused a significant drop in groundwater resources that land subsidence in some areas of the plain especially in southern parts is one of its reasons [2]. Shafi’I Motlagh (1388) stated that the risk of water resources crisis, which is caused by a sharp decline in precipitation and wrong methods of irrigation and uncontrolled exploitation of groundwater resources draws a troubling future ahead of us. Akbari et al (1388) conducted research to assess the groundwater levels drop of Mashhad plain, the statistics of 70 observed wells during 2 periods of 10 years (76 in 1366 and 87 in 1377) examined, and the results showed that during 20 years, the rate of 1.12 m, and it means that averagely every year 60 cm water level has been reduced
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