تاثير گنبدهاي نمكي در شوري آبهاي زيرزميني پلاياي داراب

The Effect of Salt Domes on the Saltiness of the Groundwater in DarabʹS Play a

Darabʹs playa is located to the Southeast of Fars province and in the small province of Darab. The Longitude and latitude of the studied area are 54°1 1ʹ49" to 54°47ʹ42" Eastern and 28°33ʹ45"to 28°49ʹ6"Northern respectively. Darab is one of the greatest agricultural zones of Fars which is basically fed by groundwater. The agricultural areas of Darab are located between the playa and the mountains around them , which consist of alluvial fans. One of the agricultural problems in Darab is the poor chemical quality of water. The chemical quality of groundwater in this playa is influenced by the existence of salt domes, the direction of groundwater , and the amount of evaporation. Among these the salt domes are the most important factor of the poor chemical quality of groundwater. There exist six salt domes around this playa which greatly influence the saltiness of the groundwater. The degree of impact of each of these salt domes depends on factors like the direction of surface and groundwater and the evolutionary stage of salt domes. Runoff of the salt domes of Coursia,Binoj, and Sachoun lead to the saltiness of the groundwater.