Document Type : Research Paper
Authors
- Mohammad hossein Nassajian Zavareh 1
- Hossein Malekinezhad 2
- Mohammad reza Ekhtesasi 3
- Mohammad Zare 4
1 PhD student, Faculty of Natural Resources and Desert Studies,,Yazd University, Iran
2 Associate Professor,Faculty of Natural Resources and Desert Studies,,Yazd University, Iran
3 Professor,Faculty of Natural Resources and Desert Studies,,Yazd University, Iran
4 Assistant Professor,,Faculty of Natural Resources and Desert Studies,,Yazd University, Iran
Abstract
The increasing exploitation of groundwater reserves and consequently the drop in the water level and reduction of the reserves have seriously caught the attention of officials and planners to the integrated management of groundwater and surface water resources. The evaluation and management of water resources are considered as one of the key factors in comprehensive development. Boein Aquifer in Isfahan Province located in the Gavkhooni Basin is studied in this study. The Standard Precipitation Index (SPI), Reclamation Drought Index (RDI) and Groundwater Standard Index (GRI) in the time scales of three, six, 12, 24 and 48 months and Cultivated Land Index (CLI) in annual time scale are calculated. Results showed that the highest correlation between the SPI and GRI is in 18 and 24 months' time scale, and there is a delay of 1.5 to 2 years between these two droughts. Contrary to the results of some references, the correlation between meteorological drought index and GRI does not always increase with increasing the time scale. A synchronic study of the SPI, GRI and CLI shows a large difference between the SRI and the other two indicators in 2004-2008 periods that may be related to the poor management of the region. However, more close values obtained for these three indices in the recent years mainly due to the better management of water consumption by relevant organizations. To determine homogeneous drought regions, different combinations of temporal and spatial scales were used by creating 39 different scenarios and running 390,000 simulations. None of the heterogeneity measures were met in 90% of cases. This indicated that the linear moment technique is not a suitable method for determining homogeneous arid regions of groundwater probably due to the non-random data. Therefore, the linear moment technique will be more useful if the data is random.
Keywords
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