EXAMINATION OF THE SOURCE OF SALINITY IN WATER RESOURCES USING ISOTOPE TECHNIQES

摘要

The study area is located in south part of Iran, west part of Fars and the northpart of Booshehr province. The area is situated between the longitudes 51°.0’ and 52°.0’and latitudes 29° 30’ and 30° 20’. The basin is a sedimentary area and hilly with gentlefold which is situated in a part of Zagros chain of mountains, in south-western of Iran.The length and width of the basin are approximately 95 and 70 km 2 respectively locatedin both side of Kazeroon fault. From the view of geology the formations of the basinare: series of Hormoz salt which is similar to salt domes, Asmari, Fars and Bakhtiariformations. The limestone formations with high permeability which make the freshwaters reservoirs of the basin are: 1) Asmari formations which is the calcareous mainreservoir of ground waters and expands as a folded layer on the surface and depth ofthe study basin. 2) Sarvak limestone formation which is outcropped in central part ofanticlines in east, north and northeast of the basin. The Shapoor river is the main riverof the area which originates from the mountains of the east part of Arjan plain, thenflows through the Kazeroon fault and after meeting some salt rivers of the middle partof the basin such as Salbiz, Malchesheikh, Chaharbisheh, Daregorg, Tanbakookar andShekastian, It will enter into the Borazjan plain. Before arriving to the Kazeroon fault,water quality of Shapoor river is good but after contacting with salt rivers and movingthrough the salt formations of the west part of basin, it severely changes. The mainobjective of this study is examination of the sources of recharge of salinity resourcesand examination of all water resources in the study area for controlling water qualityof Shapoor river. To access the following objectives more than 50 water samples weretaken from different resources such as rivers, wells and springs in both wet and dryseasons. In this regard isotopes ( 18 O, 2 H, T) as well as hydrochemistry analysis and fieldmeasurements were carried out.