Change of Sefidroud,s Channel on it,s Delta Scince 1982 Until 2008

Subject Areas : Geopolitic

Jalilaldin  Sorour ¹ (ندارد)

Received: 2014-11-29 Accepted : 2014-11-29 Published : 2009-01-20

Keywords: Delta, Sefidroud River, Guilan, River diversion,

Abstract :

In 1365, Sefidroud delta diversion during years 1982-1955 was studied bySoleyman Kosari in his essay.Based on available evidence (coastal sandy bands, marshes and etc), he proved thatSefidrood river rerouted from east to west during this period ( 27 years).In this essay Sefidroud river diversion during years 1982-1955 (about 27 years) isstudied. This study is based on direct field observation and available documentsreviews (Geology organization maps (1:100000) and Kiashahr topography map (1:5000) and aerial photos of country surveying organization (1: 10000) ).Results of field and document reviews in this research showed:Sefidrood river delta completion and its diversion was effected of following factorsduring last 27 years:• Agglomeration and accumulation of Sefidrood river sediments.• Caspian sea current and its movement direction ( opposite of clock handles).• Caspian sea wavesNeo technical movement (specially after Roudbar earthquake in 1369).The results of these effects are seen in two shapes: Land advance and sea pull backin current place of Sefidrood river arrival to Khazar sea (Sefidroud river out fall) andsecond one, sediments movements from west to east and east to west.