![]() ![]() ![]() 8-13 However, none of them covered the entire aquifer in terms of its stable isotope composition. Several studies have discussed the hydrogeology and hydrochemistryof the study area in the Al-Teeb and Ali Al-Gharbi areas (southeastern part) its surroundings, Missan province. According to the FAO Penman – Monteith method for Ali-Al Gharbi station occurs with a high value from May to September with the maximum value occurring in Jun (450 mm day -1). The 22-year (1995-2015) average rainfall in the Missanarea is 33.2 mm and average temperature is 26 ✬. ![]() The climate of the study area is hot and semi-arid. 5, 6 Many hydrological studies use the stable isotopes ( 18O, 2H) to determine the origin, recharge mechanisms and hydraulic connection of water molecules in groundwater. The first study was about survey on variations in concentration rate of 18O, after that followed by a study about variation 2H rate in natural waters, the variations of 18O in global precipitation scale, involving a discussion in great detail on the meteorological patterns. 4 The first studies on isotopes techniques in water were involved of precipitation and seawater. 2, 3 The natural isotopes (stable & unstable) contributes in many applications of hydrological, hydrogeological and geochemical sciences, which give evidence about of water sources, quality, and ages of water, in addition to recharge and movement of groundwater. ![]() 1 In order to better understand the conditions of groundwater variability from the recharge to the exploitation zones, stable isotopes of oxygen (d 18O) and hydrogen (dD) have been used. Therefore, the study of isotopes will be useful in gaining a better understanding of the hydro geological processes of the surface water-aquifer interface, and the study of aquifers in this area has been initiated to provide the necessary information to allow the sustainable development of water resources in the region. It suffers from a systematic water shortage that is exacerbated by rapid urbanization, industrialization, growing agricultural demand, and environmental degradation. The study area is located in arid or semi-arid climatic regions. The 18O and 2H isotopes of local water resources show that the rainwater is affected by the Arabian Gulf Arabian Sea potential moisture sources. The slightly variation in isotopic compositions of the Missan rain (from -4 to +3.2‰ and from -20 to -14‰ for 18O and 2H, respectively) is because of slightly seasonal changes in precipitations in this area. Both the slope and 2H intercept for AMWL are deviated from the global meteoric water line - GMWL (δ 2H = 8.13 18O + 10) and Mediterranean MWL (δ 2H = 8.13 18O + 22). For an adequate management of available water resources in semi-arid and arid regions, it is important to compare isotopic data of surface water and groundwater with the local meteoric relationship for d18O and dD in precipitations.Isotope values of precipitation indicate a local meteoric water line (Amara MWL δ2H = 7.51 δ 18O + 10.82 R2=0.94) situated between the Mediterranean MWL and Global MWL. This paper focuses on determining the Amara meteoric water line for the study area (AMWL) is defined or the first time, based on samples of precipitation collected Amara city - southeast of Iraq. ![]()
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