Fluctuation of Caspian Sea’s water level and its effect on theformation of landforms consequent of dynamics of sea and rivers(case study: Talesh province)

Periodic and recurrent changing of Caspian Sea’s water level causes transformationof coast lines and damages coastal equipments and constructions. Natural dynamics ofcoastal zone of Talesh causes unstable states on the region during different period, andnatural regime of Caspian Sea from the economical and social point of view hascreated some problems in the field of local and international planning anddevelopment.Talesh province is situated in the west coast of Caspian Sea, and noticeable swellingof water level in the coastal line of Caspian Sea, and the consequent change in thecoast of Talesh province, has inflicted many damages to coastal installation, residentialbuildings, recreational areas, and farmlands, and in the time of retreat has causeddisusing of all these constructions in the region. Moreover, fluctuation of water levelof Caspian Sea has caused submersion or reveling of the neighboring lands.In this research it has been tried to survey the changes of coastal lines in the Taleshprovince through compare and survey of aerial photographs of 1346 and 1373, LANsat photographs, and Ilwis software. The results indicate the effect of advance andretreat process of coastal lines on the morphology of the inferior parts of coastal zones.Periodic fluctuations have caused some changes in the coastal landforms of theregion and increasing of water submerges broad lands in the coast of Talesh.Numerous changes of coastal lines in Caspian Sea have caused destruction of coastlines shapes and also creation of new shapes and sandy hills alongside of the shore.Fluctuation of coast line has affected under erosion areas and deposit of rivers;these shapes in the coasts of region show model of advance, retreat, and erosion in theTalesh province. Sandy fingers which are among the important geomorphologicshapes in the coasts of region have been seen in the around of big rivers of the regionsuch as Korganroud, Shafaroud, and Lisaroud which numerous changes has been seenin them.