Application of Zeolite Coverage on Gachsaran Formation in Gotvand olya Dam to reduce the dissolution of salt

Gotvand dam reservoir with over 90 km length is surrounded by Gachsaran, Mishan, Aghajari and Bakhtiari formations. The noticeable point in the dam reservoir is the presence of Gachsaran Formation that is composed of considerable volume of salt located 4 km upstream of dam. Salinity of dam water due to dissolution of salt in reservoir water can cause serious environmental problems. In addition to direct dissolution of salt in contact with reservoir water, slope instability can also influence on this process. Probable sliding in salty layers of slopes will insert a significant volume of salt in contact with reservoir water in a short time [1]. Due to tectonic pressure, salt is compressed and turned into a vertical mass with high thickness. Due to physical properties and fluidity, Gypsum and salt formation creates certain structural form called salt tectonic at the time of rogeny. At the time of orogeny, the pressure and heat is high in depth of the earth and the evaporated water leads to severe hydration of salt. In this condition, stones and rocks are not as stable as in earth surface, instead they are plastic paste and evaporated rocks and other plastic rocks like clay and marl will be the same in salt orogeny process [1].