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Volume 41, Issue 2 (2026)
GeoRes 2026, 41(2): 1001-1016 |
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Received: 2026/06/16 | Accepted: 2026/09/7 | Published: 2026/09/19
Received: 2026/06/16 | Accepted: 2026/09/7 | Published: 2026/09/19
How to cite this article
Behzadi J, Amiri E, Javadeein S F, Moghimi A. Drought periods and their effects on Lahijan's groundwater resources. GeoRes 2026; 41 (2) :1001-1016
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Abstract (197 Views)
Aims: Among the climate change phenomena that are widespread in the world and have the greatest impact on precipitation, drought, wet and dry periods in short and long periods of time are identified. The severity of drought, frequency of occurrence and date of occurrence, and in terms of space and time, dry periods, especially long periods that affect groundwater, were determined.
Methodology: Lahijan has a special position in terms of agriculture and tourism. 30-year precipitation data from stations in Gilan province were used and its descriptive statistics were estimated. The SPI of the dry period was calculated using the 3 and 36-month methods, which is consistent with climate change in the dry process using the Mankendal method. The results of the short-term and long-term SPI operations and climate change in the GIS environment, interpolation, and the location of the most drought and drought showed that Lahijan is at a critical point.
Conclusion:
Findings: In the 30-year rainfall statistics of Lahijan, it was determined that seasonal fluctuations are less than annual fluctuations. The results obtained in estimating short and long-term periods (SPI) and interpolation in the GIS environment and the produced maps show that the most dry periods occurred in eastern Gilan and also included Lahijan County. In terms of time, the driest year was 1988, and in terms of space, drought and dry periods were more frequent in eastern Gilan than in other parts of Gilan Province.
Conclusion: The climate change map and short and long-term dry periods were almost completely consistent, and eastern Gilan had the highest intensity of drought and dry periods. Short-term dry periods affect agriculture and long-term dry periods affect water resources and groundwater, and appropriate engineering and management measures should be taken regarding water conservation and control.
Methodology: Lahijan has a special position in terms of agriculture and tourism. 30-year precipitation data from stations in Gilan province were used and its descriptive statistics were estimated. The SPI of the dry period was calculated using the 3 and 36-month methods, which is consistent with climate change in the dry process using the Mankendal method. The results of the short-term and long-term SPI operations and climate change in the GIS environment, interpolation, and the location of the most drought and drought showed that Lahijan is at a critical point.
Conclusion:
Findings: In the 30-year rainfall statistics of Lahijan, it was determined that seasonal fluctuations are less than annual fluctuations. The results obtained in estimating short and long-term periods (SPI) and interpolation in the GIS environment and the produced maps show that the most dry periods occurred in eastern Gilan and also included Lahijan County. In terms of time, the driest year was 1988, and in terms of space, drought and dry periods were more frequent in eastern Gilan than in other parts of Gilan Province.
Conclusion: The climate change map and short and long-term dry periods were almost completely consistent, and eastern Gilan had the highest intensity of drought and dry periods. Short-term dry periods affect agriculture and long-term dry periods affect water resources and groundwater, and appropriate engineering and management measures should be taken regarding water conservation and control.
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