Investigating the effects of rainfall and drought changes on Zarivar Lake ecosystem

Subject Areas : CLIMATOLOGY

Amir Gandomkar ¹ , Nader Fallah ² , Alireza Abbasi ³

1 - Department of Geography, Najafabad Branch, Islamic Azad University, Najafabad, Iran
2 - Department of Geography, Najafabad Branch, Islamic Azad University, Najafabad, Iran
3 - Department of Geography, Najafabad Branch, Islamic Azad University, Najafabad, Iran

Received: 2020-10-20 Accepted : 2021-04-30 Published : 2021-08-23

Keywords: Ecosystem, rainfall, drought, Zarivar Lake,

Abstract :

Watersheds and wetlands are the most biologically diverse ecosystems on Earth due to the presence of water. They are spread all over the planet and play an important role in the water cycle. Due to the importance of this issue, the present study was conducted to investigate the changes in precipitation and drought in Zarivar Lake and their effects on the lake ecosystem. In this regard, the annual rainfall statistics of Zarivar Lake station during the statistical period of 1397-1397 has been used. After normalization of the studied data using Anderson Darling test, it was found that they have an abnormal distribution, so the non-parametric Mann-Kendall test was used to calculate their trend. Then SIAP index was used to study the lake drought. The results show an increasing trend of precipitation during the statistical period under study. Studies on drought also showed that the years 1999 to 2003 were part of the dry years of the lake. During the period 1383-1387, the conditions were almost normal. Wet conditions have prevailed on the lake since 2008. The year 1397 also has very wet conditions. Due to the fact that 1397 was a very rainy year, but it will cause overflow and flow of water in Zarivar river and also strengthen and nourish groundwater in the southern plain of the lake and increase water quality along the river and play a significant role in reviving and strengthening the lake ecosystem. has it.