Identifying Dry Years by Using the Dependable Rainfall Index and Its Effects on the Olive Crop in Roudbar, Gilan, South Western of Caspian Sea
Authors: Bahman Ramezani Gourabi
Drought is one of the most important natural disasters which is probable to occur in all regions with completely different climates and in addition to causing death. It results in many economic losses and social consequences. For this reason. Studying the effects and losses caused by drought which include limitation or shortage of agricultural and drinking water resources. Decreased rainfall and increased evapotranspiration. Limited plant growth and decreased agricultural products. Especially those of dry-farming. Lower levels of surface and ground waters and increased immigrations. Etc. in the country is statistical period (1988-2007) for six stations in Roudbar town were used for statistical analysis and calculating humid and dry years. The dependable rainfall index (DRI) was the main method used in this research. Results showed that during the said statistical period and also during the years 1996-1998 and 2007. more than half of the stations had faced drought. With consideration of the conducted studies. Drawing diagrams and comparing the available data with those of dry and humid years it was found that drought affected agricultural products (e.g.olive) in a way that during the year 1996 1996 drought. Olive groves of Roudbar suffered the greatest damages. Whereupon about 70% of the crops were lost.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1055202Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 1386
 J.Gonzalez,M. Vieente, Drought pattern and its ecological effects in east Spain during the second half of 20th century, Mill press, Rotterdam, 2004.
 A.Rajaei , Applying Natural Geography in Urban and Rural Planning. SAMT publications,p3, 2004.
 B. Ramezani , Identifying the Drought Trend by Using Precipitation Data from the Anzali Lagoon Basin, Journal of the Geographical Space, No.12,p121, ,2004.
 W.C. Palmer, Meteorology drought , research paper office of climatology, 45, us, weather bureau, P.58 ,.1965.
 M .Zahedi., R. Ghavidel ,Determining the Drought Treshold and Cakulating the Dependable Rainfall Index for the Stations at Oroumieh Lake Catchment, Journal of Geographical Researches, No.59. Tehran University,2007.
 M .Farajzadeh, D. Movahed ,Drought in Iran, Journal of Agricultural Knowledge, No.4,1995.
 D .Camp, Global environmental issue , Rutledge , New York, 1994.
 K .Smith, Environmental Hazards, Rutledge, New York, , 1998.
 P. Kordovani,Drought and the Ways to Confront It in Iran, Tehran University publications, 2001.
 H .Ghayour, A. Masoudian ,Magnitude and Extent of Droughts in Iran, Journal of Geographical Researches. No, 45,1997.
 F. Khosh Akhlagh,Ghaemi & M.Zahehi, A Study of Monthly Patterns of Dry-and wet-years in Iran, Journal of Geographical Researches, No.45, 2006.
 B.Ramezani ,Astudy of the Drought Phenomenon by using the Normal Precipitation Percentage Index in the central Regions of Gilan Province, Biyaban Scientific and Research Journal, No.2, 2005, Tehran University.
 B.Ramezani, Drought in Gilan, Dessert Journal, University of Tehran,No.9,p97,2004.
 B. Ramezani, Recognition of climatic drought in south western of Caspian sea, Red book,IAHS pub,p 319, 2008.
 M.Farajzadeh ,Climatology Techniques. SAMT publications, (2007).